如何在Win32接口中将按钮控件的位置设置在窗口的中间

#include <windows.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        case WM_CREATE:
        {
            // 创建按钮控件
            HWND hButton = CreateWindow(
                L"BUTTON", L"按钮",
                WS_VISIBLE | WS_CHILD,
                0, 0, 0, 0,
                hwnd, NULL, NULL, NULL
            );

            // 获取窗口的客户区大小
            RECT clientRect;
            GetClientRect(hwnd, &clientRect);

            // 计算按钮控件的位置
            int buttonWidth = clientRect.right / 2;
            int buttonHeight = clientRect.bottom / 2;
            int buttonLeft = (clientRect.right - buttonWidth) / 2;
            int buttonTop = (clientRect.bottom - buttonHeight) / 2;

            // 移动按钮控件到计算得到的位置
            SetWindowPos(hButton, NULL, buttonLeft, buttonTop, buttonWidth, buttonHeight, SWP_NOZORDER);
        }
        break;

        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }

    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 注册窗口类
    WNDCLASS wc = {0};
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = L"WindowClass";
    RegisterClass(&wc);

    // 创建窗口
    HWND hwnd = CreateWindow(
        L"WindowClass", L"窗口标题",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 500, 500,
        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 0;
}