大家都对金山快译可以讲英文软件翻译成中文软件感到惊奇

其实就是全局钩子勾住textout函数

钩子头文件如下

void __declspec(dllexport) WINAPI InstallHook(BOOL,DWORD); BOOL WINAPI UnInstallHook(); LRESULT CALLBACK GetMsgProC(int code,WPARAM wParam,LPARAM lParam); void WINAPI HookOneAPI(LPCTSTR pszCalleeModuleName,PROC pfnOriginApiAddress,         PROC pfnDummyFuncAddress,HMODULE hModCallerModule); BOOL WINAPI HookAllAPI(LPCTSTR pszCalleeModuleName,PROC pfnOriginApiAddress,         PROC pfnDummyFuncAddress,HMODULE hModCallerModule); BOOL WINAPI UnhookAllAPIHooks(LPCTSTR pszCalleeModuleName,PROC pfnOriginApiAddress,          PROC pfnDummyFuncAddress,HMODULE hModCallerModule); BOOL WINAPI H_TextOutA(HDC, int, int, LPCSTR, int); BOOL WINAPI H_TextOutW(HDC, int, int, LPCWSTR, int); BOOL WINAPI H_ExtTextOutA(HDC, int, int, UINT, CONST RECT *,LPCSTR, UINT, CONST INT *); BOOL WINAPI H_ExtTextOutW(HDC, int, int, UINT, CONST RECT *,LPCWSTR, UINT, CONST INT *); 

钩子源文件如下

#include "stdafx.h"   #include "APIHook_Dll.h"   #include <ImageHlp.h>   #include <tlhelp32.h>   #pragma comment(lib,"ImageHlp") //定义全局共享数据段   #pragma data_seg("Shared")   HMODULE hmodDll=NULL;   HHOOK hHook=NULL;   #pragma data_seg()   #pragma comment(linker,"/Section:Shared,rws") //设置全局共享数据段的属性   / DllMain 函数 /   //dll的入口点   BOOL APIENTRY DllMain( HMODULE hModule,                           DWORD  ul_reason_for_call,                           LPVOID lpReserved         )   {    switch(ul_reason_for_call)    {    case DLL_PROCESS_ATTACH:     //if(sHook)           case DLL_PROCESS_DETACH:     UnInstallHook();     break;    }    hmodDll=hModule;       return TRUE;   }   / HookOneAPI 函数 /   //进行IAT转换的关键函数，其参数含义：   //pszCalleeModuleName：需要hook的模块名   //pfnOriginApiAddress：要替换的自己API函数的地址   //pfnDummyFuncAddress：需要hook的模块名的地址   //hModCallerModule：我们要查找的模块名称，如果没有被赋值，   //     将会被赋值为枚举的程序所有调用的模块   void WINAPI HookOneAPI(LPCTSTR pszCalleeModuleName,PROC pfnOriginApiAddress,            PROC pfnDummyFuncAddress,HMODULE hModCallerModule)   {    ULONG size;    //获取指向PE文件中的Import中IMAGE_DIRECTORY_DESCRIPTOR数组的指针    PIMAGE_IMPORT_DESCRIPTOR pImportDesc = (PIMAGE_IMPORT_DESCRIPTOR)     ImageDirectoryEntryToData(hModCallerModule,TRUE,IMAGE_DIRECTORY_ENTRY_IMPORT,&size);    if (pImportDesc == NULL)     return;    //查找记录,看看有没有我们想要的DLL    for (;pImportDesc->Name;pImportDesc++)    {     LPSTR pszDllName = (LPSTR)((PBYTE)hModCallerModule+pImportDesc->Name);     if (lstrcmpiA(pszDllName,pszCalleeModuleName) == 0)      break;    }    if (pImportDesc->Name == NULL)    {     return;    }    //寻找我们想要的函数    PIMAGE_THUNK_DATA pThunk =      (PIMAGE_THUNK_DATA)((PBYTE)hModCallerModule+pImportDesc->FirstThunk);//IAT    for (;pThunk->u1.Function;pThunk++)    {     //ppfn记录了与IAT表项相应的函数的地址     PROC * ppfn= (PROC *)&pThunk->u1.Function;       if (*ppfn == pfnOriginApiAddress)      {      //如果地址相同，也就是找到了我们想要的函数，进行改写，将其指向我们所定义的函数      WriteProcessMemory(GetCurrentProcess(),ppfn,&(pfnDummyFuncAddress),       sizeof(pfnDummyFuncAddress),NULL);      return;     }    }   }   //查找所挂钩的进程所应用的dll模块的   BOOL WINAPI HookAllAPI(LPCTSTR pszCalleeModuleName,PROC pfnOriginApiAddress,           PROC pfnDummyFuncAddress,HMODULE hModCallerModule)   {    if (pszCalleeModuleName == NULL)    {     return FALSE;    }    if (pfnOriginApiAddress == NULL)    {     return FALSE;    }    //如果没传进来要挂钩的模块名称，枚举被挂钩进程的所有引用的模块，    //并对这些模块进行传进来的相应函数名称的查找        if (hModCallerModule == NULL)    {     MEMORY_BASIC_INFORMATION mInfo;     HMODULE hModHookDLL;     HANDLE hSnapshot;     MODULEENTRY32 me = {sizeof(MODULEENTRY32)};     //MODULEENTRY32:描述了一个被指定进程所应用的模块的struct     VirtualQuery(HookOneAPI,&mInfo,sizeof(mInfo));     hModHookDLL=(HMODULE)mInfo.AllocationBase;          hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE,0);     BOOL bOk = Module32First(hSnapshot,&me);     while (bOk)     {      if (me.hModule != hModHookDLL)      {       hModCallerModule = me.hModule;//赋值       //me.hModule:指向当前被挂钩进程的每一个模块        HookOneAPI(pszCalleeModuleName,pfnOriginApiAddress,        pfnDummyFuncAddress,hModCallerModule);      }      bOk = Module32Next(hSnapshot,&me);     }     return TRUE;      }    //如果传进来了，进行查找    else    {     HookOneAPI(pszCalleeModuleName,pfnOriginApiAddress,       pfnDummyFuncAddress,hModCallerModule);     return TRUE;    }    return FALSE;   }    UnhookAllAPIHooks 函数 /   //通过使pfnDummyFuncAddress与pfnOriginApiAddress相等的方法，取消对IAT的修改   BOOL WINAPI UnhookAllAPIHooks(LPCTSTR pszCalleeModuleName,PROC pfnOriginApiAddress,            PROC pfnDummyFuncAddress,HMODULE hModCallerModule)   {    PROC temp;    temp = pfnOriginApiAddress;    pfnOriginApiAddress = pfnDummyFuncAddress;    pfnDummyFuncAddress = temp;    return HookAllAPI(pszCalleeModuleName,pfnOriginApiAddress,     pfnDummyFuncAddress,hModCallerModule);   }   // GetMsgProc 函数    //钩子子程。与其它钩子子程不大相同，没做什么有意义的事情，继续调用下一个钩子子程，形成循环   LRESULT CALLBACK GetMsgProc(int code,WPARAM wParam,LPARAM lParam)   {    return CallNextHookEx(hHook,code,wParam,lParam);   }    InstallHook 函数 /   //安装或卸载钩子，BOOL IsHook参数是标志位   //对要钩哪个API函数进行初始化   //我们这里装的钩子类型是WH_GETMESSAGE   void __declspec(dllexport) WINAPI InstallHook(BOOL IsHook,DWORD dwThreadId)   {    if(IsHook)    {    hHook=SetWindowsHookEx(WH_GETMESSAGE,(HOOKPROC)GetMsgProc,hmodDll,dwThreadId);        //GetProcAddress(GetModuleHandle("GDI32.dll"),"ExtTextOutA")：取得要钩的函数在所在dll中的地址        HookAllAPI("GDI32.dll",GetProcAddress(GetModuleHandle("GDI32.dll"),     "TextOutW"),(PROC)&H_TextOutW,NULL);    HookAllAPI("GDI32.dll",GetProcAddress(GetModuleHandle("GDI32.dll"),     "TextOutA"),(PROC)&H_TextOutA,NULL);    }    else    {     UnInstallHook();     UnhookAllAPIHooks("GDI32.dll",GetProcAddress(GetModuleHandle("GDI32.dll"),      "TextOutW"),(PROC)&H_TextOutW,NULL);     UnhookAllAPIHooks("GDI32.dll",GetProcAddress(GetModuleHandle("GDI32.dll"),      "TextOutA"),(PROC)&H_TextOutA,NULL);    }   }   / UnInstallHook 函数    //卸载钩子   BOOL WINAPI UnInstallHook()   {    UnhookWindowsHookEx(hHook);    return TRUE;   }   / H_TextOutA 函数 /   //我们的替换函数，可以在里面实现我们所要做的功能   //这里我做的是显示一个对话框，指明是替换了哪个函数   BOOL WINAPI H_TextOutA(HDC hdc,int nXStart,int nYStart,LPCSTR lpString,int cbString)   {   //  FILE *stream=fopen("logfile.txt","a+t");    MessageBox(NULL,"TextOutA","APIHook_Dll ---rivershan",MB_OK);    TextOutA(hdc,nXStart,nYStart,lpString,cbString);//返回原来的函数，以显示字符   // fprintf(stream,lpString);   // fclose(stream);    return TRUE;   }   / H_TextOutW 函数 /   //同上   BOOL WINAPI H_TextOutW(HDC hdc,int nXStart,int nYStart,LPCWSTR lpString,int cbString)   {     MessageBox(NULL,"TextOutW","APIHook_Dll ---rivershan",MB_OK);    TextOutW(hdc,nXStart,nYStart,lpString,cbString);//返回原来的函数，以显示字符    return TRUE;   

设置全局钩子如下

InstallHook(TRUE,0);