使用CreateWindow函数的例子？

以下是使用CreateWindow函数创建窗口的示例代码：

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // Step 1: Register the Window Class
    WNDCLASS wc = { 0 };

    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);
    wc.lpszClassName = "MyWindowClass";

    RegisterClass(&wc);

    // Step 2: Create the Window
    HWND hwnd = CreateWindow(
        "MyWindowClass",        // Name of window class to use
        "Hello, World!",        // Title of window
        WS_OVERLAPPEDWINDOW,    // Style of window
        CW_USEDEFAULT,         // X position of window
        CW_USEDEFAULT,         // Y position of window
        CW_USEDEFAULT,         // Width of window
        CW_USEDEFAULT,         // Height of window
        NULL,                   // Handle to parent window (none)
        NULL,                   // Handle to menu (none)
        hInstance,              // Handle to application instance
        NULL                    // Additional data (none)
    );

    // Step 3: Show and Update the Window
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    // Step 4: Run the Message Loop
    MSG msg = { 0 };

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    // Step 5: Unregister the Window Class
    UnregisterClass("MyWindowClass", hInstance);

    return (int)msg.wParam;
}

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

    return 0;
}

在此示例中，我们首先注册了一个名为"MyWindowClass"的窗口类，然后使用CreateWindow函数创建了一个窗口，并指定了窗口的标题、样式、位置和大小等信息。接下来，我们显示和更新了窗口，并运行了一个消息循环，以便响应用户的输入事件。最后，我们在窗口关闭时注销了窗口类。窗口过程函数WndProc负责处理窗口事件，例如当用户关闭窗口时，它会发送WM_DESTROY消息给窗口程序，这个程序会调用PostQuitMessage函数来退出消息循环并关闭应用程序。