如果我将wndproc函数赋给wndclass，则会出现错误

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    // 处理窗口消息的代码
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 创建窗口类结构体
    WNDCLASS wndclass = {};
    wndclass.lpfnWndProc = WndProc;  // 将wndproc函数的地址赋给lpfnWndProc成员
    wndclass.hInstance = hInstance;
    wndclass.lpszClassName = "MyWindowClass";

    // 注册窗口类
    RegisterClass(&wndclass);

    // 创建窗口实例
    HWND hwnd = CreateWindow("MyWindowClass", "My Window", WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, hInstance, NULL);

    // 显示窗口
    ShowWindow(hwnd, nCmdShow);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}