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？

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;

}

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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:

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;
}

testcs_dn解决方案记录：

定义全局变量：

HINSTANCEg_hInstance;

CString g_szDllPath = "";

DLL构造函数中初始化全局变量：

DEFAULTSKIN_API CDefaultSkinApp::CDefaultSkinApp() // : CWinApp(NULL)
{
    // TODO: add construction code here,
    // Place all significant initialization in InitInstance
    InitSkinLib(_T("blue"));
    CString appPath;
    ::GetModuleFileName(AfxGetApp()->m_hInstance,  appPath.GetBuffer(MAX_PATH), MAX_PATH);
    appPath.ReleaseBuffer();
    int pos = appPath.ReverseFind('\\');
    if (pos != -1){
        g_szDllPath.Format(_T("%s%s"), appPath.Left(pos + 1), _T("DefaultSkin.dll"));
    }
    if (!g_szDllPath.IsEmpty()){
        g_hInstance = GetModuleHandle(g_szDllPath);
    }
}

FindResource中使用g_hInstance

OK，问题解决！

突然在搜索结果中发现：AFX_MANAGE_STATE(AfxGetStaticModuleState());

AFX_MANAGE_STATE(AfxGetStaticModuleState());

HINSTANCE hInst =  AfxGetResourceHandle();//g_hInstance; //AfxGetInstanceHandle(); //

HRSRC hRsrc = ::FindResource (hInst,MAKEINTRESOURCE(nResID), _T("PNG"));

这才是上好的解决之道

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