C++ MFC有进程没有界面

Question

LRESULT CALLBACK WinSunPrnc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPrcvInstance,
    LPSTR IpCmdLine,
    int nCmdShow
    )
{
    WNDCLASS wndcls;
    wndcls.cbClsExtra = 0;//类的附加字节数
    wndcls.cbWndExtra = 0;//窗口额外附加字节数
    wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);//背景
    wndcls.hCursor = LoadCursor(NULL, IDC_CROSS);//光标
    wndcls.hIcon = LoadIcon(NULL, IDI_ERROR);//图标a
    wndcls.hInstance = hInstance;//
    wndcls.lpfnWndProc = WinSunPrnc;//窗口过程实例
    wndcls.lpszClassName = "First MFC";//类名化;
    wndcls.lpszMenuName = NULL;//菜单的名字
    wndcls.style = CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wndcls);

    HWND hwnd;
    hwnd = CreateWindow("First MFC 2015","吉林大学", WS_OVERLAPPEDWINDOW, 0, 100, 600, 800, NULL, NULL, hInstance, NULL);
    ShowWindow(hwnd, SW_SHOWNORMAL);
    UpdateWindow(hwnd);
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)){
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0; 

 LRESULT CALLBACK WinSunPrnc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){
    switch (uMsg)
    {
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar, "char is %d", wParam);
        MessageBox(hwnd, szChar, TEXT("First MFC 2015"), 0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd, TEXT("muse clicked"), TEXT("mause"), 0);
        HDC hdc;
        hdc = GetDC(hwnd);
        TextOut(hdc, 0, 50, TEXT("its amazing"), strlen("its amazing"));
        ReleaseDC(hwnd, hdc);
        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC = BeginPaint(hwnd, &ps);
        TextOut(hDC, 0, 0, TEXT("翟羽翔"), strlen("翟羽翔"));
        EndPaint(hwnd, &ps);
        break;
    case WM_CLOSE:
        if (IDYES == MessageBox(hwnd, TEXT("是否真的结束？"), TEXT("First MFC"), MB_YESNO))
        {
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
}

运行之后只有进程没有界面是为什么。。

Answer 1

你的窗口回调函数在哪里？
WinSunPrnc在哪里？