转载:https://blog.csdn.net/ithzhang/article/details/7995102
在EXE和DLL中,FindResource的区别
以下的代码在EXE中,执行无误。可是在DLL中FindResource返回的值就为0了,我用::GetLastError(),得出的值是1813,也就是取不到资源,这是为什么?
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BOOL ExtractFile(char *szZlibFile,DWORD dwRID)
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{
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HANDLE hFile = NULL ;
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HRSRC hRsrc = NULL ;
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HGLOBAL hGlobal = NULL ;
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DWORD dwResSize = 0, dwBytesWrite = 0, dwBytesRead = 0;
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PVOID pRsrc = NULL, pConfigEncrypt = NULL;
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hRsrc = FindResource( NULL, MAKEINTRESOURCE(dwRID), "ZLIB");
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if(hRsrc == NULL)
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{
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MyDbgPrint("[ExtractFile] Locate Resource Error: %d ", GetLastError());
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return FALSE;
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}
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dwResSize = SizeofResource(NULL, hRsrc);
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hGlobal = LoadResource(NULL, hRsrc);
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if(hGlobal == NULL)
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{
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MyDbgPrint("[ExtractFile] Load Resource Error: %d ", GetLastError());
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return FALSE;
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}
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pRsrc = LockResource(hGlobal);
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hFile = CreateFile( szZlibFile , GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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if(hFile == INVALID_HANDLE_VALUE)
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{
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MyDbgPrint("[ExtractFile] Create %s File Error: %d ", szZlibFile , GetLastError());
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return FALSE;
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}
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if( WriteFile( hFile, pRsrc, dwResSize, &dwBytesWrite, NULL) == FALSE)
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{
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MyDbgPrint("[ExtractFile] Write %s File Error: %d ", szZlibFile , GetLastError());
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return FALSE;
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}
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CloseHandle(hFile);
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MyDbgPrint("[ExtractFile] Write %s File Success ",szZlibFile);
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return TRUE;
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}
问题出在FindResource的第一个参数取得的HINSTANCE句柄是EXE的HINSTANCE句柄,自然在其中也找不到在DLL中引入的ZLIB这个位图ID了.同时SizeofResource,LoadResource中的第一个参数也应该是DLL的句柄.
解决方法如下:
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BOOL ExtractFile(char *szZlibFile,DWORD dwRID)
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{
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HANDLE hFile = NULL ;
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HRSRC hRsrc = NULL ;
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HGLOBAL hGlobal = NULL ;
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DWORD dwResSize = 0, dwBytesWrite = 0, dwBytesRead = 0;
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PVOID pRsrc = NULL, pConfigEncrypt = NULL;
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HINSTANCE hInst = GetModuleHandle( dll的路径 );
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hRsrc = FindResource( hInst , MAKEINTRESOURCE(dwRID), (LPCTSTR)"ZLIB");
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if(hRsrc == NULL)
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{
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return FALSE;
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}
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dwResSize = SizeofResource( hInst , hRsrc);
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hGlobal = LoadResource( hInst , hRsrc);
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if(hGlobal == NULL)
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{
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return FALSE;
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}
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pRsrc = LockResource(hGlobal);
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hFile = CreateFile( szZlibFile , GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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if(hFile == INVALID_HANDLE_VALUE)
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{
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return FALSE;
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}
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if( WriteFile( hFile, pRsrc, dwResSize, &dwBytesWrite, NULL) == FALSE)
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{
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return FALSE;
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}
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CloseHandle(hFile);
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return TRUE;
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}