如何从头开始启动 MFC 应用程序?

2022-01-12 00:00:00 c++ mfc

换句话说，来自一个空白的 win32 项目(没有向导).

In other words from a blank win32 project (no wizard).

这就是我所在的地方:

预处理器定义:WIN32

Preprocessor Definitions: WIN32

链接器->系统->子系统=控制台

Linker->System->Subsystem = Console

int _tmain()
{
    int nRetCode = 0;

    // initialize MFC and print and error on failure
    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    {
        // TODO: change error code to suit your needs
        _tprintf(_T("Fatal Error: MFC initialization failed
"));
        return nRetCode = 1;
    }

    MyWinApp* app = new MyWinApp();

    app->InitApplication();
    app->InitInstance();

    app->Run();

    AfxWinTerm();

    return 0;
}


class MyWinApp: public CWinApp
{
public:
    BOOL InitInstance();

    int Run();
};


BOOL MyWinApp::InitInstance()
{
    return TRUE;
}

int MyWinApp::Run()
{
    return CWinThread::Run();
}

跳过 CWinApp::Run()，因为它会寻找一个主窗口.

Skipping over the CWinApp::Run() because it looks for a main window.

然而，在 CWinThread::Run() 中，ASSERT_VALID 失败.在 quickwatch 的顶部，它说 MyWinApp 无效.

In CWinThread::Run() however, the ASSERT_VALID fails. At the top of quickwatch for this it says MyWinApp is invalid.

我需要以其他方式创建 MyWinApp 吗?

Do I need to create MyWinApp in another way?

推荐答案

你可能失败了，因为你正在创建 CWinApp 在你调用 AfxWinInit.在常规的 MFC 应用程序中，CWinApp 是一个全局变量，它在 main 之前构造.这样，当 MFC 初始化时，它就有一个有效的全局 CWinApp.试试:

You're probably failing because you're creating the CWinApp after you're calling AfxWinInit. In a regular MFC app, the CWinApp is a global variable, which is constructed before main. This way, when MFC is initialized, it has a valid global CWinApp in place. Try:

MyWinApp* app = new MyWinApp();   // ^moved up^

// initialize MFC and print and error on failure
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
    // TODO: change error code to suit your needs
    _tprintf(_T("Fatal Error: MFC initialization failed
"));
    return nRetCode = 1;
}

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