ole32.dll(ole32.dll是什么)奔走相告

'and would otherwise share the vCode of the last created instance.

 

总共就两个部分，第一部分说几个声明API并使用的技巧，第二部分简单讲一下怎么动态调用DLL一、动态声明玩API的人看到前面的描述肯定会心里MMP，废话少说，看内容1、相对路径声明这个最好理解普通的API声明长这样：。

Declare Function LZ4_versionNumber Lib "liblz4" Alias "_LZ4_versionNumber@0" () As Long 下面是其FullPath版本的声明：

Declare Function LZ4_versionNumber Lib "c:\liblz4.dll" Alias "_LZ4_versionNumber@0" () As Long 下面是其相对路径版本的声明：

Declare Function LZ4_versionNumber Lib "..\Plugins\liblz4" Alias "_LZ4_versionNumber@0" () As Long 这特么怎么这么复杂呢，这三种都可以？下面也就简单一解释，不做深入研究，各位看官也就看看就好，能记住就记住。

先说FullPath版本，这是最低级的使用方法，一般人不会这么用；还有一种方法也可以指定FullPath，那就是使用manifest，manifest是个好东西，这个以后再扒然后是普通的API和相对路径的API，这俩其实是一个原理：。

对于VB6，怎么检索DLL呢，当然是先检索App.Path（1、不检索子目录；2、VBA里对应Application.Path）然后再检索环境变量目录很多人不知道怎么看环境变量，Win+R，cmd，输入set，enter，就看到了所有环境变量

上述DLL静态声明，会在当前目录和所有环境变量目录，以相对路径检索DLL（如果多个路径都检索到，这个要应用检索规则，这里也不扒了）假设环境变量中有一个路径：c:\xxx那么API中的"..\Plugins\liblz4"和"liblz4"，就分别对应了路径：

"c:\xxx\..\Plugins\liblz4.dll"和"c:\xxx\liblz4.dll"上面".."的意思是指上一级目录，也即"c:\xxx\..\Plugins\liblz4.dll" = "c:\Plugins\liblz4.dll"

2、动态路径先说怎么用，声明就跟普通声明方式一样：Declare Function LZ4_versionNumber Lib "liblz4" Alias "_LZ4_versionNumber@0" () As Long

但是，如果这时候在环境变量目录下都没有这个dll的话在使用这个dll之前，我们可以用LoadLibrary这个API来加载一下dll，就可以调用"LZ4_versionNumber"了Declare声明函数时，是声明函数指针，并指明入口点，VB6会通过内部函数DllFunctionCall（该函数会调用LoadLibraryA）来调用外部API

如果Declare时，在所有路径都找不到DLL，而这时候，你主动使用LoadLibrary加载了该DLL这时候，就解决了加载DLL的问题，相当于运行时重定向DLL3、修改环境变量VB6程序在加载时，会优先加载App.Path

然后会加载进程环境变量，进程环境变量这里相关的API有5个，这里用到的就前2个：Declare Function GetEnvironmentVariableA Lib "kernel32" (ByVal lpName As String, ByVal lpBuffer As String, ByVal nSize As Long) As Long 单个获取进程环境变量 Declare Function SetEnvironmentVariableA Lib "kernel32" (ByVal lpName As String, ByVal lpValue As String) As Long 单个设置进程环境变量 Declare Function GetEnvironmentStringsA Lib "kernel32" () As Long 获取当前进程所有环境变量 Public Declare Function SetEnvironmentStringsA Lib "kernel32" (ByVal lpszEnvironmentBlock As Long) As Long 设置当前进程所有环境变量 Public Declare Function FreeEnvironmentStringsA Lib "kernel32" (ByVal lpszEnvironmentBlock As Long) As Long 清理临时指针

然后加环境变量就是这样操作： Dim lngRet As Long Dim strDest As String Dim arr() As String, i As Long Dim boolIn As Boolean 路径是否在环境变量中 Const MAX_BUFFER = 9000& strDest = String$(MAX_BUFFER, Chr(0)) GetEnvironmentVariableA "Path", strDest, MAX_BUFFER + 1 获取当前进程的Path环境变量 lngRet = InStr(strDest, Chr(0)) strDest = Left(strDest, lngRet - 1) 清掉缓存字符 arr = Split(strDest, ";") 判断路径是否已经在环境变量中 For i = LBound(arr) To UBound(arr) If arr(i) = strMatch Then boolIn = True Exit For End If Next i If boolIn = False Then SetEnvironmentVariableA "Path", strDllPath & ";" & strDest 设置当前进程的Path环境变量，加在最前面 End If

这样设置之后，检测DLL的时候，就多了一个自定义设置的strDllPath路径了二、动态调用以下内容多且复杂，初学者直接跳过，由于这里对外链卡得比较严，我就只敢贴代码所以，需要探讨的，在评论里交流很多时候，开发者不想写那么多Declare，就论这个问题，其实有两个解决方案。

一个是使用tlb，现在有很多包含win32api的tlb文件，tlb文件制作简单，在编写代码时引用到工程里，发布程序时不需要附带tlb文件还有一种方案就是动态调用：说起来方法其实很简单第1步：LoadLibrary，加载DLL模块到内存

第2步：GetProcAddress，获取DLL里的API函数指针第3步：CallWindowProc或者DispCallFunc，调用函数第4步：FreeLibrary，用完了释放函数但是如果真的要自己去研究，而且要支持多种调用约定的话，就比较麻烦了。

像CallWindowProc，在不写汇编代码的情况下，只能支撑有4个参数的API这里当然不会讲怎么写汇编代码，所以这里推荐几个已有的轮子：不用知其所以然，只用知道怎么用就好第1个：DispCallFunc方案。

vbforums论坛高人Lavolpe写的类cUniversalDLLCalls.cls，理论上支持9种调用约定 for documentation on the main API DispCallFunc... http://msdn.microsoft.com/en-us/library/windows/desktop/ms221473%28v=vs.85%29.aspx

Private Declare Function DispCallFunc Lib "oleaut32.dll" (ByVal pvInstance As Long, ByVal offsetinVft As Long, ByVal CallConv As Long, ByVal retTYP As Integer, ByVal paCNT As Long, ByRef paTypes As Integer, ByRef paValues As Long, ByRef retVAR As Variant) As Long

Private Declare Function GetModuleHandle Lib "kernel32.dll" Alias "GetModuleHandleA" (ByVal lpModuleName As String) As Long

Private Declare Function GetProcAddress Lib "kernel32.dll" (ByVal hModule As Long, ByVal lpProcName As String) As Long

Private Declare Function LoadLibrary Lib "kernel32.dll" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long

Private Declare Function FreeLibrary Lib "kernel32.dll" (ByVal hLibModule As Long) As LongPrivate Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)

Private Declare Sub FillMemory Lib "kernel32.dll" Alias "RtlFillMemory" (ByRef Destination As Any, ByVal Length As Long, ByVal Fill As Byte)

Private Declare Sub SetLastError Lib "kernel32.dll" (ByVal dwErrCode As Long)Private Declare Function lstrlenA Lib "kernel32.dll" (ByVal lpString As Long) As Long

Private Declare Function lstrlenW Lib "kernel32.dll" (ByVal lpString As Long) As Long APIs used for _CDecl callback workarounds. See ThunkFor_CDeclCallbackToVB & ThunkRelease_CDECL

Private Declare Function VirtualAlloc Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long

Private Declare Function VirtualFree Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal dwFreeType As Long) As Long

Public Enum CALLINGCONVENTION_ENUM http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.comtypes.callconv%28v=vs.110%29.aspx

CC_FASTCALL = 0& CC_CDECL CC_PASCAL CC_MACPASCAL CC_STDCALL typical windows APIs CC_FPFASTCALL CC_SYSCALL

CC_MPWCDECL CC_MPWPASCALEnd EnumPublic Enum CALLRETURNTUYPE_ENUM CR_None = vbEmpty CR_LONG = vbLong CR_BYTE = vbByte

CR_INTEGER = vbInteger CR_SINGLE = vbSingle CR_DOUBLE = vbDouble CR_CURRENCY = vbCurrency if the value you need isnt in above list, you can pass the value manually to the

CallFunction_DLL method below. For additional values, see: http://msdn.microsoft.com/en-us/library/cc237865.aspx

End EnumPublic Enum STRINGPARAMS_ENUM STR_NONE = 0& STR_ANSI STR_UNICODEEnd EnumPrivate m_DLLname As String track last DLL loaded by this class

Private m_Mod As Long reference to loaded modulePrivate m_Release As Boolean whether or not we unload the module/dll

Public Function CallFunction_DLL(ByVal LibName As String, ByVal FunctionName As String, _ ByVal HasStringParams As STRINGPARAMS_ENUM, _

ByVal FunctionReturnType As CALLRETURNTUYPE_ENUM, _ ByVal CallConvention As CALLINGCONVENTION_ENUM, _

ParamArray FunctionParameters() As Variant) As Variant Used to call standard dlls, not active-x or COM objects

Return value. Will be a variant containing a value of FunctionReturnType If this method fails, the return value will always be Empty. This can be verified by checking

the Err.LastDLLError value. It will be non-zero if the function failed else zero. If the method succeeds, there is no guarantee that the function you called succeeded. The

success/failure of that function would be indicated by this methods return value. If calling a sub vs function & this method succeeds, the return value will be zero.

Summarizing: if method fails to execute, Err.LastDLLError value will be non-zero If method executes ok, return value is from the DLL you called

Parameters: LibName. The dll name. You should always include the extension else DLL is used See LoadLibrary documentation for more: http://msdn.microsoft.com/en-us/library/windows/desktop/ms684175%28v=vs.85%29.aspx

FunctionName. The DLL function to call. This is case-senstiive To call a function by ordinal, prefix it with a hash symbol, i.e., #124

HasStringParams. Provide one of the 3 available values STR_NONE. No parameters are strings or all strings are passed via StrPtr()

STR_UNICODE. Any passed string values are for a Unicode function, i.e., SetWindowTextW STR_ANSI. Any passed string values are for an ANSI function, i.e., SetWindowTextA

Important: If you pass one of FunctionParameters a String variable, you must include STR_UNICODE or STR_ANSI depending on what version function you are calling

See the FunctionParameters section below for more FunctionReturnType. Describes what variant type the called function returns

If calling a subroutine that does not return a value, use CR_None CallConvention. One of various DLL calling conventions

You must know the calling convention of the function you are calling and the number of parameters, along with the parameter variable type

FunctionParameters. The values and variant type for each value as required by the function you are calling. This is important. Passing incorrect variable types can cause crashes.

There is no auto-conversion like VB would do for you if you were to call an API function. To ensure you pass the correct variable type, use VBs conversion routines:

Passing a Long? CLng(10), CLng(x). Passing an Integer? CInt(10), CInt(x) Special cases: UDTs (structures). Pass these using VarPtr(), i.e., VarPtr(uRect)

If UDT members contain static size strings, you should declare those string members as Byte arrays instead. When array is filled in by the function you called,

you can use StrConv() to convert array to string. If UDT members contain dynamic size strings, you should declare those as Long.

When the function returns, you can use built-in functions within this class to retrieve the string from the pointer provided to your UDT.

Arrays. DO NOT pass the array. Pass only a pointer to the first member of the array, i.e., VarPtr(myArray(0)), VarPtr(myArray(0,0)), etc

Strings for ANSI functions. 1) Passing by variable name or value? i.e., strContent, "Edit", etc The string needs to be converted to ANSI, and this class will do that for you

if you also pass HasStringParams as STR_ANSI. Otherwise, do NOT pass strings for ANSI functions by variable name or value. When passed by variable name,

the variable contents are changed to 1 byte per character. To prevent this, pass the variable name inside parentheses, i.e., (myVariable)

2) Passing by StrPtr()? i.e, StrPtr(strContent), StrPtr("Edit") If the function you are calling needs the string contents, then do NOT pass

the string this way. You must first convert it to ANSI. Else, you could pass it as desribed in #1 above.

Rule-of-Thumb. If string is just a buffer, pass it by StrPtr(), then on return, use VBs StrConv() to convert it from ANSI to unicode. Otherwise, pass the

string by variable name or value Strings for Unicode functions 1) Passing by variable name or value? i.e., strContent, "Edit", etc

Internally, the string must be passed to the function ByVal via StrPtr(). This class will do that, but it is faster (less code) if you pass all strings

for unicode functions via StrPtr() 2) Passing by StrPtr()? i.e, StrPtr(strContent), StrPtr("Edit") Less code required, fastest method, no conversions required at all

Rule-of-Thumb. All strings for unicode functions should be passed via StrPtr() Numeric values vs. variables. Be aware of the variable type of the number you pass.

Depending on the value of the number, it may be Integer, Long, Double, etc. Numbers in range -32768 to 32767 are Integer, from -2147483648 to 2147483647 are Long

Fractional/decimal numbers are Double If function parameter expects Long, dont pass just 5, pass 5& or CLng(5)

Numbers as variables. Be sure the variable type matches the parameter type, i.e., dont pass variables declared as Variant to a function expecting Long

// minimal sanity check for these 4 parameters: If LibName = vbNullString Then Exit Function If FunctionName = vbNullString Then Exit Function

If Not (FunctionReturnType And &HFFFF0000) = 0& Then Exit Function can only be 4 bytes If HasStringParams STR_UNICODE Then Exit Function

Dim sText As String, lStrPtr As Long, lValue As Long Const VT_BYREF As Long = &H4000& Dim hMod As Long, fPtr As Long

Dim pIndex As Long, pCount As Long Dim vParamPtr() As Long, vParamType() As Integer Dim vRtn As Variant, vParams() As Variant

// determine if we will be loading this or already loaded If LibName = m_DLLname Then hMod = m_Mod already loaded

Else If Not m_Mod = 0& Then reset m_Mod & m_Release If m_Release = True Then FreeLibrary m_Mod m_Mod = 0&: m_Release = False

End If hMod = GetModuleHandle(LibName) loaded in process already? If hMod = 0& Then if not, load it now

hMod = LoadLibrary(LibName) If hMod = 0& Then Exit Function m_Release = True need to use FreeLibrary at some point

End If m_Mod = hMod cache hMod & LibName m_DLLname = LibName End If fPtr = GetProcAddress(hMod, FunctionName) get the function pointer (Case-Sensitive)

If fPtr = 0& Then Exit Function abort if failure vParams() = FunctionParameters() copy passed parameters, if any

pCount = Abs(UBound(vParams) - LBound(vParams) + 1&) If HasStringParams > STR_NONE Then patch to ensure Strings passed as handles

For pIndex = 0& To pCount - 1& for each string param, get its StrPtr If VarType(FunctionParameters(pIndex)) = vbString Then

CopyMemory lValue, ByVal VarPtr(FunctionParameters(pIndex)), 2& If (lValue And VT_BYREF) = 0& Then else variant has pointer to StrPtr

lValue = VarPtr(FunctionParameters(pIndex)) + 8& Else CopyMemory lValue, ByVal VarPtr(FunctionParameters(pIndex)) + 8&, 4&

End If CopyMemory lStrPtr, ByVal lValue, 4& get the StrPtr If lStrPtr > 0& Then if not null then If HasStringParams = STR_ANSI Then convert Unicode to ANSI

sText = FunctionParameters(pIndex) then re-write the passd String to ANSI FillMemory ByVal lStrPtr, LenB(sText), 0

sText = StrConv(sText, vbFromUnicode) CopyMemory ByVal lStrPtr, ByVal StrPtr(sText), LenB(sText) End If

End If vParams(pIndex) = lStrPtr reference the StrPtr End If Next End If fill in rest of APIs parameters

If pCount = 0& Then no return value (sub vs function) ReDim vParamPtr(0 To 0) ReDim vParamType(0 To 0)

Else ReDim vParamPtr(0 To pCount - 1&) need matching array of parameter types ReDim vParamType(0 To pCount - 1&) and pointers to the parameters

For pIndex = 0& To pCount - 1& vParamPtr(pIndex) = VarPtr(vParams(pIndex)) vParamType(pIndex) = VarType(vParams(pIndex))

Next End If call the function now lValue = DispCallFunc(0&, fPtr, CallConvention, FunctionReturnType, _

pCount, vParamType(0), vParamPtr(0), vRtn) If lValue = 0& Then 0 = S_OK If FunctionReturnType = CR_None Then

CallFunction_DLL = lValue Else CallFunction_DLL = vRtn return result End If Else SetLastError lValue set error & return Empty

End IfEnd FunctionPublic Function CallFunction_COM(ByVal InterfacePointer As Long, ByVal VTableOffset As Long, _

ByVal FunctionReturnType As CALLRETURNTUYPE_ENUM, _ ByVal CallConvention As CALLINGCONVENTION_ENUM, _

ParamArray FunctionParameters() As Variant) As Variant Used to call active-x or COM objects, not standard dlls

Return value. Will be a variant containing a value of FunctionReturnType If this method fails, the return value will always be Empty. This can be verified by checking

the Err.LastDLLError value. It will be non-zero if the function failed else zero. If the method succeeds, there is no guarantee that the Interface function you called succeeded. The

success/failure of that function would be indicated by this methods return value. Typically, success is returned as S_OK (zero) and any other value is an error code.

If calling a sub vs function & this method succeeds, the return value will be zero. Summarizing: if method fails to execute, Err.LastDLLError value will be non-zero

If method executes ok, if the return value is zero, method succeeded else return is error code Parameters:

InterfacePointer. A pointer to an object/class, i.e., ObjPtr(IPicture) Passing invalid pointers likely to result in crashes

VTableOffset. The offset from the passed InterfacePointer where the virtual function exists. These offsets are generally in multiples of 4. Value cannot be negative.

For the remaining parameters, see the details withn the CallFunction_DLL method. They are the same with one exception: strings. Pass the string variable name or value

// minimal sanity check for these 4 parameters: If InterfacePointer = 0& Or VTableOffset < 0& Then Exit Function

If Not (FunctionReturnType And &HFFFF0000) = 0& Then Exit Function can only be 4 bytes Dim pIndex As Long, pCount As Long

Dim vParamPtr() As Long, vParamType() As Integer Dim vRtn As Variant, vParams() As Variant vParams() = FunctionParameters() copy passed parameters, if any

pCount = Abs(UBound(vParams) - LBound(vParams) + 1&) If pCount = 0& Then no return value (sub vs function)

ReDim vParamPtr(0 To 0) ReDim vParamType(0 To 0) Else ReDim vParamPtr(0 To pCount - 1&) need matching array of parameter types

ReDim vParamType(0 To pCount - 1&) and pointers to the parameters For pIndex = 0& To pCount - 1& vParamPtr(pIndex) = VarPtr(vParams(pIndex))

vParamType(pIndex) = VarType(vParams(pIndex)) Next End If call the function now pIndex = DispCallFunc(InterfacePointer, VTableOffset, CallConvention, FunctionReturnType, _

pCount, vParamType(0), vParamPtr(0), vRtn) If pIndex = 0& Then 0 = S_OK CallFunction_COM = vRtn return result

Else SetLastError pIndex set error & return Empty End IfEnd FunctionPublic Function PointerToStringA(ByVal ANSIpointer As Long) As String

courtesy function provided for your use as needed ANSIpointer must be a pointer to an ANSI string (1 byte per character)

Dim lSize As Long, sANSI As String If Not ANSIpointer = 0& Then lSize = lstrlenA(ANSIpointer) If lSize > 0& Then

sANSI = String$(lSize \ 2& + 1&, vbNullChar) CopyMemory ByVal StrPtr(sANSI), ByVal ANSIpointer, lSize

PointerToStringA = Left$(StrConv(sANSI, vbUnicode), lSize) End If End IfEnd FunctionPublic Function PointerToStringW(ByVal UnicodePointer As Long) As String

courtesy function provided for your use as needed UnicodePointer must be a pointer to an unicode string (2 bytes per character)

Dim lSize As Long If Not UnicodePointer = 0& Then lSize = lstrlenW(UnicodePointer) If lSize > 0& Then

PointerToStringW = Space$(lSize) CopyMemory ByVal StrPtr(PointerToStringW), ByVal UnicodePointer, lSize * 2&

End If End IfEnd FunctionPublic Function ThunkFor_CDeclCallbackToVB(ByVal VBcallbackPointer As Long, _

ByVal CallbackParamCount As Long) As Long this method is a workaround for cases where you are calling a CDECL function that requests

a callback function address in CDECL calling convention. Ex: qsort in msvcrt20.dll uses such a callback & qsort function description found here:

http://msdn.microsoft.com/en-us/library/zes7xw0h.aspx Important notes: 1) DO NOT USE this workaround when any function accepting a callback pointer,

uses stdCall calling convention to that pointer. DO NOT USE this function for other than CDECL functions calling back to VB

2) This methods return value MUST BE RELEASED via a call to ThunkRelease_CDECL method 3) The VB callback function must be a function vs. sub, even if the the callback

definition describes it as a sub, i.e., returns no value, void 4) The thunk prevents VBs stack cleaning by copying first, then replacing it after VB returns

Parameters: VBcallbackPointer: the VB callback address. If function exists in a bas module, then this would be the return value of your AddressOf call. If using thunks to get addresses

from class methods, then pass that thunk address as appropriate CallbackParamCount: Number of parameters your VB method accepts. This cannot be dynamic

sample call: assume that vbCallBackFunction is a Public function within a bas module -------------------------------------------------------------------------------------

Dim lCallback As Long, lThunkAddress As Long, lResult As Long lCallback = thisClass.ThunkFor_CDeclCallbackToVB(AddressOf vbCallBackFunction, 2&, lThunkAddress)

now call your CDECL function, passing lCallback as the required callback address paramter, in whatever param position it is required

lResult = thisClass.CallFunction_DLL("someCDECL.dll", "functionName", STR_NONE, CR_LONG, _ CC_CDECL, params, lCallback)

destroy the thunk when no longer needed Call thisClass.ThunkRelease_CDECL(lThunkAddress) sanity checks on passed parameters

If VBcallbackPointer = 0& Or CallbackParamCount 63& Then Exit Function FYI: Why is 63 the max count? CallbackParamCount stored in the thunk as unsigned byte: 63*4 =252

Dim fPtr As Long, tCode(0 To 2) As Currency fPtr = VirtualAlloc(0&, 28&, &H1000&, &H40&) reserve memory for our virtual function

tCode(0) = 465203369712025.6232@ thunk code is small, 28 bytes tCode(1) = -140418483381718.8329@ tCode(2) = -4672484613390.9419@

CopyMemory ByVal fPtr, ByVal VarPtr(tCode(0)), 24& copy to virt memmory CopyMemory ByVal fPtr + 24&, &HC30672, 4& copy final 4 bytes also

thunk uses relative address to VB function address, calc relative address & patch the thunk CopyMemory ByVal fPtr + 10&, VBcallbackPointer - fPtr - 14&, 4&

CopyMemory ByVal fPtr + 16&, CallbackParamCount * 4&, 1& patch thunks param count (stack adjustment)

ThunkFor_CDeclCallbackToVB = fPtr FYI: Thunk described below. Paul Catons work found here: http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=49776&lngWId=1

============================================================================== ;FASM syntax use32 ;32bit

call L1 ;Call the next instruction L1: pop eax ;Pop the return address into eax (eax = L1) pop dword [eax+(L3-L1)] ;Pop the calling cdecl functions return address to the save location

db 0E8h ;Op-code for a relative address call dd 55555555h ;Address of target vb callback function, patched at run-time

sub esp, 55h ;Unfix the stack, our caller expects to do it, patched at runtime call L2 ;Call the next instruction

L2: pop edx ;Pop the return address into edx (edx = L2) push dword [edx+(L3-L2)];Push the saved return address, the stack is now as it was on entry to callback_wrapper

ret ;Return to caller db 0 ;Alignment pad L3: dd 0 ;Return address of the cdecl caller saved here

==============================================================================End FunctionPublic Sub ThunkRelease_CDECL(ByVal ThunkCallBackAddress As Long)

Used to release memory created during a call to the ThunkFor_CDeclCallbackToVB method. The parameter passed here must be the return value of the ThunkFor_CDeclCallbackToVB method

If Not ThunkCallBackAddress = 0& Then VirtualFree ThunkCallBackAddress, 0&, &H8000&End SubPrivate Sub Class_Terminate()

If Not m_Mod = 0& Then If m_Release = True Then FreeLibrary m_Mod End IfEnd Sub这个类强大的不行，使用起来也极其简单：Private Type RECT Left As Long Top As Long Right As Long Bottom As Long End Type Private Sub Command1_Click() Dim c As cUniversalDLLCalls Dim sBuffer As String, lLen As Long Set c = New cUniversalDLLCalls /// 1st four examples show 2 ways of calling an ANSI function & 2 ways of calling a Unicode function example of calling ANSI function, passing strings ByRef Debug.Print "ANSI string parameters, ByRef..." lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextLengthA", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd) sBuffer = String$(lLen, vbNullChar) STR_ANSI + string variable name = ByRef lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextA", STR_ANSI, CR_LONG, CC_STDCALL, Me.hWnd, sBuffer, lLen + 1&) Debug.Print vbTab; "form caption is: "; Left$(StrConv(sBuffer, vbUnicode), lLen); "<<<" example of calling ANSI function, passing strings ByVal Debug.Print "ANSI string parameters, ByVal..." lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextLengthA", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd) sBuffer = String$(lLen, vbNullChar) STR_NONE + string variable name = ByVal. Note: Only use ANSI ByRef if string sole purpose is a buffer lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextA", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd, StrPtr(sBuffer), lLen + 1&) Debug.Print vbTab; "form caption is: "; Left$(StrConv(sBuffer, vbUnicode), lLen); "<<<" example of calling UNICODE function, passing strings ByRef Debug.Print "Unicode string parameters, ByRef..." lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextLengthW", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd) sBuffer = String$(lLen, vbNullChar) STR_UNICODE + string variable name = ByRef lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextW", STR_UNICODE, CR_LONG, CC_STDCALL, Me.hWnd, sBuffer, lLen + 1&) Debug.Print vbTab; "form caption is: "; Left$(sBuffer, lLen); "<<<" example of calling UNICODE function, passing strings ByVal Debug.Print "Unicode string parameters, ByVal..." lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextLengthW", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd) sBuffer = String$(lLen, vbNullChar) STR_NONE + StrPtr(variable name) = ByVal lLen = c.CallFunction_DLL("user32.dll", "GetWindowTextW", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd, StrPtr(sBuffer), lLen + 1&) Debug.Print vbTab; "form caption is: "; Left$(sBuffer, lLen); "<<<" /// UDT/Array examples example of passing a structure Dim tRect As RECT Debug.Print "UDT/structure parameters, ByRef..." Call c.CallFunction_DLL("user32.dll", "GetWindowRect", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd, VarPtr(tRect)) Debug.Print vbTab; "window position on screen: L"; CStr(tRect.Left); ".T"; CStr(tRect.Top); " R"; CStr(tRect.Right); ".B"; CStr(tRect.Bottom) the RECT structure is 16 bytes, we can use an array of Long if we like Dim aRect(0 To 3) As Long Debug.Print "Array parameters, ByRef..." Call c.CallFunction_DLL("user32.dll", "GetWindowRect", STR_NONE, CR_LONG, CC_STDCALL, Me.hWnd, VarPtr(aRect(0))) Debug.Print vbTab; "window position on screen: L"; CStr(aRect(0)); ".T"; CStr(aRect(1)); " R"; CStr(aRect(2)); ".B"; CStr(aRect(3)) /// CDecl function call Dim sFmt As String sBuffer = String$(1024, vbNullChar) sFmt = "P1=%s, P2=%d, P3=%.4f, P4=%s" unicode version of the function Debug.Print "CDecl Unicode parameters, ByRef..." lLen = c.CallFunction_DLL("msvcrt.dll", "swprintf", STR_UNICODE, CR_LONG, CC_CDECL, sBuffer, sFmt, "ABC", 123456, 1.23456, "xyz") Debug.Print vbTab; "printf: "; Left$(sBuffer, lLen) ANSI version of the function, same parameters Debug.Print "CDecl ANSI parameters, ByRef..." lLen = c.CallFunction_DLL("msvcrt.dll", "sprintf", STR_ANSI, CR_LONG, CC_CDECL, sBuffer, (sFmt), "ABC", 123456, 1.23456, "xyz") Debug.Print vbTab; "printf: "; Left$(StrConv(sBuffer, vbUnicode), lLen) /// COM object call All VB objects inherit from IUnknown (which has 3 virtual functions) IPicture inherits from IUnknown and has several virtual functions This example will call the 1st function which is now the 4th function, preceeded by IUnknowns 3 functions NOTE: simple example. We can declare a IPicture interface via VB, but many interfaces are not exposed, and this example indicates how to get a pointer to the interface & call functions from that pointer. But just like any function, you must research to determine the VTable order & function parameter requirements. Do not assume that some page describing the interface functions lists the functions in VTable order. That assumption will lead to crashes. Dim IID_IPicture As Long, aGUID(0 To 3) As Long, lPicHandle As Long Const IUnknownQueryInterface As Long = 0& IUnknown vTable offset to Query implemented interfaces Const IUnknownRelease As Long = 8& IUnkownn vTable offset to decrement reference count Const IPictureGetHandle As Long = 12& 4th VTable offset from IUnknown GUID for IPicture {7BF80980-BF32-101A-8BBB-00AA00300CAB} c.CallFunction_DLL "ole32.dll", "CLSIDFromString", STR_UNICODE, CR_LONG, CC_STDCALL, "{7BF80980-BF32-101A-8BBB-00AA00300CAB}", VarPtr(aGUID(0)) c.CallFunction_COM ObjPtr(Me.Icon), IUnknownQueryInterface, CR_LONG, CC_STDCALL, VarPtr(aGUID(0)), VarPtr(IID_IPicture) If IID_IPicture <> 0& Then get the icon handle & then Release the IPicture interface. QueryInterface calls AddRef internally c.CallFunction_COM IID_IPicture, 12&, CR_LONG, CC_STDCALL, VarPtr(lPicHandle) c.CallFunction_COM IID_IPicture, IUnknownRelease, CR_LONG, CC_STDCALL End If Debug.Print "COM interface call example..." Debug.Print vbTab; "Me.Icon.Handle = "; Me.Icon.Handle; " IPicture.GetHandle = "; lPicHandle The PointerToString methods are a courtesy /// simple example to return a string from a pointer sFmt = "LaVolpe" Debug.Print "PointerToStringA & PointerToStringW examples..." sBuffer = c.PointerToStringW(StrPtr(sFmt)) unicode example Debug.Print vbTab; sBuffer; "<<<" sFmt = StrConv(sFmt, vbFromUnicode) sBuffer = c.PointerToStringA(StrPtr(sFmt)) ANSI example Debug.Print vbTab; sBuffer; "<<<" End Sub

stdcall和cdecl的支持已经做进来了，其他的没有给应用案例，不知道能不能用第2个，Paul Caton的cCallFunc2.cls，支持的调用约定stdcall、cdecl、fastcall********************************************************************************** ** cCallFunc2.cls - cCallFunc with added fastcall support, call by address and ** additional return types ** ** Universal dll function/sub calling class ** cdecl/stdcall/fastcall calling convention ** Call by ordinal, name or address ** Module (.bas) callbacks for cdecl. ** Object (.cls/.frm/.ctl) callbacks for cdecl/stdcall ** Support for multiple callbacks. ** Support for multiple cCallFunc2 instances ** Support unicode path\module names ** ** If you wish to do crazy stuff like CallFunc with callbacks inside a callback ** then the best solution is to make a copy of the class, eg cCallFunc1.cls, and ** use an instance of that where needed. ** ** Calling conventions: ** stdcall: parameters right to left, called routine adjusts the stack ** cdecl: parameters right to left, caller adjusts the stack ** fastcall: first parameter, if present, in the ecx register ** second parameter, if present, in the edx register ** any other parameters are pushed to the stack ** called routine adjusts the stack ** N.B. fastcall isnt standardised, differing conventions exist. ** This class supports the Microsoft/GCC implementation. ** ** paul_caton@hotmail.com ** ** 20031029 First cut....................................................... v1.00 ** 20071129 Now using virtual memory to fix a DEP issue..................... v1.01 ** 20071130 Hacked from cCDECL, now supports stdcall and ordinals........... v1.02 ** 20071201 Added support for callback objects.............................. v1.03 ** 20071202 Unicode support for paths\modules where available............... v1.04 ** 20071213 Forked from cCallFunc.cls ** Added support for fastcall calling convention ** Added CallPointer ** Changed the interface to be more property like.................. v1.05 ** 20080212 Support Byte, Integer, Long, Single and Double return types..... v1.06 ** 20080311 Added IsValidDll and IsValidMethod ** Parameter block made global ** Eliminated MAX_ARG, VB has a limit of 60 parameters ** Various optimizations........................................... v1.07 ********************************************************************************** Option Explicit API declarations Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As Long) As Long Private Declare Function GetDesktopWindow Lib "user32" () As Long Private Declare Function GetLastError Lib "kernel32" () As Long Private Declare Function GetProcByName Lib "kernel32" Alias "GetProcAddress" (ByVal hModule As Long, ByVal lpProcName As String) As Long Private Declare Function GetProcByOrdinal Lib "kernel32" Alias "GetProcAddress" (ByVal hModule As Long, ByVal nOrdinal As Long) As Long Private Declare Function IsBadCodePtr Lib "kernel32" (ByVal lpfn As Long) As Long Private Declare Function IsWindowUnicode Lib "user32" (ByVal hWnd As Long) As Long Private Declare Function LoadLibraryA Lib "kernel32" (ByVal lpLibFileName As String) As Long Private Declare Function LoadLibraryW Lib "kernel32" (ByVal lpLibFileName As Long) As Long Private Declare Function VirtualAlloc Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long Private Declare Function VirtualFree Lib "kernel32" (ByVal lpAddress As Long, ByVal dwSize As Long, ByVal dwFreeType As Long) As Long Private Declare Sub GetMem1 Lib "msvbvm60" (ByVal Addr As Long, RetVal As Byte) Private Declare Sub GetMem4 Lib "msvbvm60" (ByVal Addr As Long, RetVal As Long) Private Declare Sub PutMem1 Lib "msvbvm60" (ByVal Addr As Long, ByVal NewVal As Byte) Private Declare Sub PutMem2 Lib "msvbvm60" (ByVal Addr As Long, ByVal NewVal As Integer) Private Declare Sub PutMem4 Lib "msvbvm60" (ByVal Addr As Long, ByVal NewVal As Long) Private Declare Sub PutMem8 Lib "msvbvm60" (ByVal Addr As Long, ByVal NewVal As Currency) Private Declare Sub SetLastError Lib "kernel32" (ByVal dwErrCode As Long) Public Enum eObjType Object type for CallbackObj... also incorporates vTable offsets objCls = &H1C Class object callback objFrm = &H6F8 Form object callback objCtl = &H7A4 UserControl object callback End Enum Public Enum eReturnType CallFunc/CallPointer return types... also incorporates return type jump values retByte = &H0 Return Byte retInteger = &H4 Return Integer retLong = &H9 Return Long retInt64 = &HD Return 64 bit value eg. Currency retSingle = &H14 Return Single retDouble = &H18 Return Double retSub = &H1A No return value End Enum Private Const SRC As String = "cCallFunc2." Error source Private Type tParamBlock Parameter block type ParamCount As Long Number of parameters Params(0 To 59) As Long Array of parameters End Type Private m_FastCall As Boolean FastCall private property value Private m_LastError As Long LastError private property value Private bUnicode As Boolean Unicode flag Private vCode As Long Pointer to the machine-code thunks Private vTable As Long Class vTable address Private nAddrPb As Long Address of the parameter block Private hModule As Long Current/last-used dll handle Private strLastDLL As String Current/last-used dll name Private strLastFunc As String Current/last-used function/sub name Private pb As tParamBlock Parameter block CallFunc: strDLL - Name of the DLL RetType - Function return type strFunc - Name of the function or its ordinal value preceded by a # eg. "#2" ParamLongs - Any number [or none] of parameters As Long. To pass the address (ByRef) of a string use StrPtr, eg. StrPtr(strPath) To pass the address (ByRef) of a variable or UDT use VarPtr, eg. VarPtr(i) Public Function CallFunc(ByRef strDll As String, _ ByVal RetType As eReturnType, _ ByRef strFunc As String, _ ParamArray ParamLongs() As Variant) As Variant Dim bNewDll As Boolean New dll flag If StrComp(strDll, strLastDLL, vbTextCompare) <> 0 Then If the module is new Dim hMod As Long If bUnicode Then If unicode hMod = LoadLibraryW(StrPtr(strDll & vbNullChar)) Load the module with the unicode version of LoadLibrary Else hMod = LoadLibraryA(strDll) Load the module with the ascii version of LoadLibrary End If If hMod = 0 Then If the load failed Debug.Assert False Halt if running under the VB IDE Err.Raise vbObjectError + 0, SRC & "CallFunc", "DLL failed load" Raise an error if running compiled End If If hModule <> 0 Then If a module is already loaded FreeLibrary hModule Free the last module End If hModule = hMod Save the module handle strLastDLL = strDll Save the new module name bNewDll = True Indicate that its a new module End If If bNewDll Or StrComp(strFunc, strLastFunc, vbBinaryCompare) <> 0 Then If the function or module is new Dim fnAddress As Long Function address If Asc(strFunc) = 35 Then If "#..." eg "#2", ordinal 2 fnAddress = GetProcByOrdinal(hModule, CLng(Mid$(strFunc, 2))) Get the address of the function by ordinal Else fnAddress = GetProcByName(hModule, strFunc) Get the address of the function by name End If If fnAddress = 0 Then If the function wasnt found in the module Debug.Assert False Halt if running under the VB IDE Err.Raise vbObjectError + 1, SRC & "CallFunc", "Function not found" Raise an error if running compiled End If strLastFunc = strFunc Save the function name PutMem4 vCode + &H19, fnAddress - vCode - (&H19 + 4) Patch the code with the relative address to the target function End If With pb Dim i As Long Parameter loop vars Dim j As Long Parameter loop vars j = UBound(ParamLongs) Get the upper parameter array bound For i = 0 To j For each parameter .Params(i) = ParamLongs(i) Store the parameter in the parameter block Next i .ParamCount = i Store the parameter count (j + 1) End With CallFunc = CallCommon(RetType) Call common code End Function CallPointer: call a function by address RetType - Function return type fnAddress - Address of the target function ParamLongs - Any number of parameters As Long, or none. To pass the address (ByRef) of a string use StrPtr, eg. StrPtr(strPath) To pass the address (ByRef) of a variable or UDT use VarPtr, eg. VarPtr(i) Public Function CallPointer(ByVal RetType As eReturnType, _ ByVal fnAddress As Long, _ ParamArray ParamLongs() As Variant) As Variant Dim i As Long Parameter loop vars Dim j As Long Parameter loop vars With pb j = UBound(ParamLongs) Get the upper parameter array bound For i = 0 To j For each parameter .Params(i) = ParamLongs(i) Store the parameter in the parameter block Next i .ParamCount = i Store the parameter count (j + 1) End With strLastFunc = vbNullString Ensure we dont clash with CallFunc caching PutMem4 vCode + &H19, fnAddress - vCode - (&H19 + 4) Patch the code with the relative address to the target function CallPointer = CallCommon(RetType) Call common code End Function CallbackCdecl: return a wrapper address for a bas module routine to be used as a callback for a cdecl function. Note: stdcall functions dont need a thunk to use a bas module function as a callback, use direct. nModFuncAddr - The address of the bas module callback function, use AddressOf to get this value nParms - The number of parameters that will be passed to the bas module callback function nIndex - Allow for multiple simultaneous callbacks Public Function CallbackCdecl(ByVal nModFuncAddr As Long, _ ByVal nParams As Long, _ Optional ByVal nIndex As Long = 1) As Long If nIndex 60 Or nParams > 60 Then Parameter sanity checks Debug.Assert False Halt if running under the VB IDE Err.Raise vbObjectError + 2, SRC & "CallbackCdecl", "Invalid parameter" Raise error if running compiled End If CallbackCdecl = vCode + 128 + ((nIndex - 1) * 64) Address of the callback wrapper. Pass this return value as the callback address parameter of the cdecl function PutMem8 CallbackCdecl + 0, 465203369712025.6232@ Callback wrapper machine code PutMem8 CallbackCdecl + 8, -140418483381718.8339@ PutMem8 CallbackCdecl + 16, -801546908679710.9163@ PutMem4 CallbackCdecl + 10, nModFuncAddr - CallbackCdecl - (10 + 4) Patch the code to call the vb bas module callback function PutMem1 CallbackCdecl + 16, nParams * 4 Patch the code to apply the necessary stack adjustment End Function CallbackObj: return a wrapper address for an object callback from a cdecl or stdcall function objType - Callback object type objCallback - The callback object nParams - The number of parameters that will be passed to the object callback function nOrdinal - Callback ordinal. 1 = last private function in the callback object, 2 = second last private function in the callback object, etc bCDECL - Specifes whether the callback calling function is cdecl or stdcall nIndex - Allow for multiple simultaneous callbacks Public Function CallbackObj(ByVal objType As eObjType, _ ByRef objCallback As Object, _ ByVal nParams As Long, _ Optional ByVal nOrdinal As Long = 1, _ Optional ByVal bCDECL As Boolean = False, _ Optional ByVal nIndex As Long = 1) As Long Dim o As Long Object pointer Dim i As Long vTable entry counter Dim j As Long vTable address Dim n As Long Method pointer Dim b As Byte First method byte Dim m As Byte Known good first method byte If nIndex 60 Or nParams > 60 Then Parameter sanity checks Debug.Assert False Halt if running under the VB IDE Err.Raise vbObjectError + 3, SRC & "CallbackObj", "Invalid parameter" Raise error if running compiled End If o = ObjPtr(objCallback) Get the callback objects address GetMem4 o, j Get the address of the callback objects vTable j = j + objType Increment to the the first user entry for this callback object type GetMem4 j, n Get the method pointer GetMem1 n, m Get the first method byte... &H33 if pseudo-code, &HE9 if native j = j + 4 Bump to the next vtable entry For i = 1 To 511 Loop through a sane number of vtable entries GetMem4 j, n Get the method pointer If IsBadCodePtr(n) Then If the method pointer is an invalid code address GoTo vTableEnd Weve reached the end of the vTable, exit the for loop End If GetMem1 n, b Get the first method byte If b <> m Then If the method byte doesnt matche the known good value GoTo vTableEnd Weve reached the end of the vTable, exit the for loop End If j = j + 4 Bump to the next vTable entry Next i Bump counter Debug.Assert False Halt if running under the VB IDE Err.Raise vbObjectError + 4, SRC & "CallbackObj", "Ordinal not found" Raise error if running compiled vTableEnd: Weve hit the end of the vTable GetMem4 j - (nOrdinal * 4), n Get the method pointer for the specified ordinal CallbackObj = vCode + 128 + ((nIndex - 1) * 64) Address of the callback wrapper. Pass this return value as the callback address parameter PutMem8 CallbackObj + 0, 648518346342877.6073@ Callback wrapper machine code PutMem8 CallbackObj + 8, 9425443492.7235@ PutMem8 CallbackObj + 16, -29652486425477.8624@ PutMem8 CallbackObj + 24, 614907631944580.0296@ PutMem8 CallbackObj + 32, -444355163233240.1323@ PutMem4 CallbackObj + 40, &H90900055 PutMem1 CallbackObj + &HD, nParams Patch the number of params PutMem4 CallbackObj + &H19, o Patch the callback object PutMem4 CallbackObj + &H1E, n - CallbackObj - (&H1E + 4) Patch the callback call address PutMem1 CallbackObj + &H28, IIf(bCDECL, 0, nParams * 4) Patch the stack correction End Function Public Property Get FastCall() As Boolean Get FastCall flag FastCall = m_FastCall End Property Public Property Let FastCall(ByVal bValue As Boolean) Let Fastcall flag m_FastCall = bValue PutMem2 vCode + &H11, IIf(m_FastCall, &H34EB, &H9090) Patch the code as per FastCall status End Property IsValidDll - return whether the passed dll [path\]name is valid strDLL - [path\]name of the DLL Public Function IsValidDll(ByRef strDll As String) Dim hMod As Long If bUnicode Then If unicode hMod = LoadLibraryW(StrPtr(strDll & vbNullChar)) Load the module with the unicode version of LoadLibrary Else hMod = LoadLibraryA(strDll) Load the module with the ascii version of LoadLibrary End If If hMod Then If the library loaded okay FreeLibrary hMod Free the library IsValidDll = True Indicate success End If End Function IsValidMethod - return whether the passed dll [path\]name / method name is valid strDLL - [path\]name of the DLL strFunc - Name of the function or its ordinal value preceded by a # eg. "#2" Public Function IsValidMethod(ByRef strDll As String, _ ByRef strFunc As String) Dim hMod As Long If bUnicode Then If unicode hMod = LoadLibraryW(StrPtr(strDll & vbNullChar)) Load the module with the unicode version of LoadLibrary Else hMod = LoadLibraryA(strDll) Load the module with the ascii version of LoadLibrary End If If hMod Then If the library loaded okay Dim nFuncAddr As Long Function address If Asc(strFunc) = 35 Then If "#..." eg "#2", ordinal 2 nFuncAddr = GetProcByOrdinal(hModule, CLng(Mid$(strFunc, 2))) Get the address of the function by ordinal Else nFuncAddr = GetProcByName(hModule, strFunc) Get the address of the function by name End If If nFuncAddr Then If the function was found in the module IsValidMethod = True Indicate success End If FreeLibrary hMod Free the library End If End Function Public Property Get LastError() As Long Get last error LastError = m_LastError End Property CallCommon: common CallFunc/CallPointer code RetType - Function return type Private Function CallCommon(ByVal RetType As eReturnType) As Variant PutMem1 vCode + &H27, RetType Patch the return type jump SetLastError 0 Clear the error code N.B. we patch the vTable on each call because there could be multiple instances of this class. Multiple instances share the same code... and would otherwise share the vCode of the last created instance. So we re-patch the vTable on each call to ensure the entry is hooked to the instances vCode Select Case RetType Select on return type Case eReturnType.retByte Return a Byte PutMem4 vTable + (19 * 4), vCode Patch the z_CallFunc_i08 entry to point to vCode CallCommon = z_CallFunc_i08(nAddrPb) Call Case eReturnType.retInteger Return an Integer PutMem4 vTable + (20 * 4), vCode Patch the z_CallFunc_i16 entry to point to vCode CallCommon = z_CallFunc_i16(nAddrPb) Call Case eReturnType.retLong Return a Long PutMem4 vTable + (21 * 4), vCode Patch the z_CallFunc_i32 entry to point to vCode CallCommon = z_CallFunc_i32(nAddrPb) Long Case eReturnType.retInt64 Return 64bits (e.g. Currency) PutMem4 vTable + (22 * 4), vCode Patch the z_CallFunc_i64 entry to point to vCode CallCommon = z_CallFunc_i64(nAddrPb) Call Case eReturnType.retSingle Return a Single PutMem4 vTable + (23 * 4), vCode Patch the z_CallFunc_Sng entry to point to vCode CallCommon = z_CallFunc_Sng(nAddrPb) Call Case eReturnType.retDouble Return a Double PutMem4 vTable + (24 * 4), vCode Patch the z_CallFunc_Dbl entry to point to vCode CallCommon = z_CallFunc_Dbl(nAddrPb) Call Case eReturnType.retSub Subroutine, no return value PutMem4 vTable + (25 * 4), vCode Patch the z_CallFunc_Sub entry to point to vCode Call z_CallFunc_Sub(nAddrPb) Call Case Else Undefined return type Debug.Assert False Halt if running under the VB IDE Err.Raise vbObjectError + 5, SRC & "CallCommon", "Unknown return type" Raise error if running compiled End Select m_LastError = GetLastError() Get the error code End Function Class_Initialize: initialize the cCallFunc2 instance Private Sub Class_Initialize() vCode = VirtualAlloc(0, &H1000&, &H1000&, &H40&) Allocate 4k of read/write/executable memory PutMem8 vCode + 0, 695618785647368.6248@ Universal function caller machine code PutMem8 vCode + 8, -208726556020175.3831@ PutMem8 vCode + 16, -29652486425143.4233@ PutMem8 vCode + 24, 614902794093417.828@ PutMem8 vCode + 32, 193965741455568.6229@ PutMem8 vCode + 40, -151277692825560.6392@ PutMem8 vCode + 48, -857442152266638.7183@ PutMem8 vCode + 56, 21029022751752.3025@ PutMem8 vCode + 64, -7203916540378.4739@ PutMem8 vCode + 72, -61276775362635.1564@ PutMem8 vCode + 80, -454553025687766.4117@ GetMem4 ObjPtr(Me), vTable Get the address of the class vTable If GetProcByName(LoadLibraryA("user32"), "IsWindowUnicode") Then Is IsWindowUnicode present bUnicode = IsWindowUnicode(GetDesktopWindow()) Determine whether well use the unicode version of LoadLibrary End If FastCall = False Default to non-Fastcall nAddrPb = VarPtr(pb) Address of the parameter block End Sub Class_Terminate: cleanup the cCallFunc2 instance Private Sub Class_Terminate() If hModule <> 0 Then If a module is loaded FreeLibrary hModule Free the loaded module End If VirtualFree vCode, 0, &H8000& Free the allocated memory End Sub ********************************************************************************************************** These following functions vTable method pointers are patched to point to vCode in CallFunc & CallPointer Note: these functions must be private and cannot be moved within this source file. ********************************************************************************************************** z_CallFunc_i08: return Byte Private Function z_CallFunc_i08(ByVal nParmAddr As Long) As Byte Debug.Assert False Halt if running under the VB IDE End Function z_CallFunc_i16: return Integer nParmAddr - address of the parameter block Private Function z_CallFunc_i16(ByVal nParmAddr As Long) As Integer Debug.Assert False Halt if running under the VB IDE End Function z_CallFunc_i32: return Long nParmAddr - address of the parameter block Private Function z_CallFunc_i32(ByVal nParmAddr As Long) As Long Debug.Assert False Halt if running under the VB IDE End Function z_CallFunc_i64: return int64 nParmAddr - address of the parameter block Private Function z_CallFunc_i64(ByVal nParmAddr As Long) As Currency Debug.Assert False Halt if running under the VB IDE End Function z_CallFunc_Sng: return Single nParmAddr - address of the parameter block Private Function z_CallFunc_Sng(ByVal nParmAddr As Long) As Single Debug.Assert False Halt if running under the VB IDE End Function z_CallFunc_Dbl: return Double nParmAddr - address of the parameter block Private Function z_CallFunc_Dbl(ByVal nParmAddr As Long) As Double Debug.Assert False Halt if running under the VB IDE End Function z_CallFunc_Sub: no return value nParmAddr - address of the parameter block Private Sub z_CallFunc_Sub(ByVal nParmAddr As Long) Debug.Assert False Halt if running under the VB IDE End Sub

其他的应用也有很多，但是这两个类最强大，最稳健。

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