在VC++中新建个一个简单的dll
代码如下：Msimg32ForVC.cpp
#include "stdafx.h"
#include <tchar.h>
//bool is_Load;
HMODULE g_hDll;
PVOID g_pOldAlphaBlend;
PVOID g_pOldDllInitialize;
PVOID g_pOldGradientFill;
PVOID g_pOldTransparentBlt;
PVOID g_pOldvSetDdrawflag;
void ExpLoad()
{
HINSTANCE g_ExpData = LoadLibrary("ExpData.dll");//你需要调用的dll文件、文件名自定
if(g_ExpData>0)
{
typedef (*ExpLoad)();
ExpLoad expLoad = (ExpLoad)GetProcAddress(g_ExpData,"ExpLoad");//接口为ExpLoad，也可自定
expLoad();
}
}
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
g_hDll = LoadLibrary(_T("C:\\Windows\\system32\\msimg32.dll"));
if (g_hDll > 0)
{
g_pOldAlphaBlend = GetProcAddress(g_hDll, "AlphaBlend");
g_pOldDllInitialize = GetProcAddress(g_hDll, "DllInitialize");
g_pOldGradientFill = GetProcAddress(g_hDll, "GradientFill");
g_pOldTransparentBlt = GetProcAddress(g_hDll, "TransparentBlt");
g_pOldvSetDdrawflag = GetProcAddress(g_hDll, "vSetDdrawflag");
ExpLoad();
}
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
void __declspec(naked) AlphaBlend()
{
__asm jmp g_pOldAlphaBlend;
}
void __declspec(naked) DllInitialize()
{
__asm jmp g_pOldDllInitialize;
}
void __declspec(naked) GradientFill()
{
__asm jmp g_pOldGradientFill;
}
void __declspec(naked) TransparentBlt()
{
__asm jmp g_pOldTransparentBlt;
}
void __declspec(naked) vSetDdrawflag()
{
__asm jmp g_pOldvSetDdrawflag;
}
代码如下：Msimg32ForVC.def
LIBRARY
EXPORTS
AlphaBlend
DllInitialize
GradientFill
TransparentBlt
vSetDdrawflag
编译即可
