HWND无法创建窗口

Question

我尝试createWindow但ghWnd总是为null，奇怪的是，在我朋友的笔记本电脑上，这很好，但是在我的笔记本电脑上，我有一个问题，因为ghWnd为null，它不会出现。

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    MSG        msg;
    WNDCLASS   wndclass;

    /* Register the frame class */
    wndclass.style         = 0;
    wndclass.lpfnWndProc   = (WNDPROC)MainWndProc;
    wndclass.cbClsExtra    = 0;
    wndclass.cbWndExtra    = 0;
    wndclass.hInstance     = hInstance;
    wndclass.hIcon         = LoadIcon (hInstance, szAppName);
    wndclass.hCursor       = LoadCursor (NULL,IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wndclass.lpszMenuName  = szAppName;
    wndclass.lpszClassName = szAppName;

    if (!RegisterClass (&wndclass) )
        return FALSE;

    /* Create the frame */
    ghWnd = CreateWindow (szAppName,
             "Proyek Grafkom",
         WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
             CW_USEDEFAULT,
             CW_USEDEFAULT,
             WIDTH,
             HEIGHT,
             NULL,
             NULL,
             hInstance,
             NULL);

    /* make sure window was created */
    if (!ghWnd)
        return FALSE;

    /* show and update main window */
    ShowWindow (ghWnd, nCmdShow);

    UpdateWindow (ghWnd);


}

我该做什么？

Answer 1

和消息循环？这是我的代码，复制：

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, 
WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_CLOSE:
            DestroyWindow(hwnd);
        break;
        case WM_DESTROY:
            PostQuitMessage(0);
        break;
        default:
             return DefWindowProc(hwnd, msg, wParam, 
             lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE 
hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    MSG messages;
    const char* classnm = "Thw window classname";

    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style         = 0;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.lpszMenuName  = nullptr;
    wc.lpszClassName = classnm;
    wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

    if(!RegisterClassEx(&wc))
    {
          std::cout << "Window registration failed!";
          return -1;
    }

  HWND  hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        classnm,
        "Answer on the stack overflow",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
        nullptr, nullptr, hInstance, NULL);

    if(hwnd == nullptr)
    {
          std::cout << "Window creation failed!";
          return -2;
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    //Mesaage loop:
    while(GetMessage(&messages, nullptr, 0, 0) > 0)
    {
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }
    return 0;
}