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?
BOOL ExtractFile(char *szZlibFile,DWORD dwRID)
{
HANDLE hFile = NULL ;
HRSRC hRsrc = NULL ;
HGLOBAL hGlobal = NULL ;
DWORD dwResSize = 0, dwBytesWrite = 0, dwBytesRead = 0;
PVOID pRsrc = NULL, pConfigEncrypt = NULL;
hRsrc = FindResource( NULL, MAKEINTRESOURCE(dwRID), "ZLIB");
if(hRsrc == NULL)
{
MyDbgPrint("[ExtractFile] Locate Resource Error: %d\n", GetLastError());
return FALSE;
}
dwResSize = SizeofResource(NULL, hRsrc);
hGlobal = LoadResource(NULL, hRsrc);
if(hGlobal == NULL)
{
MyDbgPrint("[ExtractFile] Load Resource Error: %d\n", GetLastError());
return FALSE;
}
pRsrc = LockResource(hGlobal);
hFile = CreateFile( szZlibFile , GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if(hFile == INVALID_HANDLE_VALUE)
{
MyDbgPrint("[ExtractFile] Create %s File Error: %d\n", szZlibFile , GetLastError());
return FALSE;
}
if( WriteFile( hFile, pRsrc, dwResSize, &dwBytesWrite, NULL) == FALSE)
{
MyDbgPrint("[ExtractFile] Write %s File Error: %d\n", szZlibFile , GetLastError());
return FALSE;
}
CloseHandle(hFile);
MyDbgPrint("[ExtractFile] Write %s File Success\n",szZlibFile);
return TRUE;
}
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:
BOOL ExtractFile(char *szZlibFile,DWORD dwRID)
{
HANDLE hFile = NULL ;
HRSRC hRsrc = NULL ;
HGLOBAL hGlobal = NULL ;
DWORD dwResSize = 0, dwBytesWrite = 0, dwBytesRead = 0;
PVOID pRsrc = NULL, pConfigEncrypt = NULL;
HINSTANCE hInst = GetModuleHandle( dll的路径 );
hRsrc = FindResource( hInst , MAKEINTRESOURCE(dwRID), (LPCTSTR)"ZLIB");
if(hRsrc == NULL)
{
return FALSE;
}
dwResSize = SizeofResource( hInst , hRsrc);
hGlobal = LoadResource( hInst , hRsrc);
if(hGlobal == NULL)
{
return FALSE;
}
pRsrc = LockResource(hGlobal);
hFile = CreateFile( szZlibFile , GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if(hFile == INVALID_HANDLE_VALUE)
{
return FALSE;
}
if( WriteFile( hFile, pRsrc, dwResSize, &dwBytesWrite, NULL) == FALSE)
{
return FALSE;
}
CloseHandle(hFile);
return TRUE;
}