如何防止SetWindowPos()使窗口全屏显示？

#include <Windows.h>

BOOL IsWindowFullScreen(HWND hWnd)
{
    RECT rect;
    GetWindowRect(hWnd, &rect);

    int screenWidth = GetSystemMetrics(SM_CXSCREEN);
    int screenHeight = GetSystemMetrics(SM_CYSCREEN);

    if (rect.left == 0 && rect.top == 0 && rect.right == screenWidth && rect.bottom == screenHeight)
    {
        return TRUE;
    }

    return FALSE;
}

void SetWindowNotFullScreen(HWND hWnd, int x, int y, int width, int height)
{
    if (!IsWindowFullScreen(hWnd))
    {
        SetWindowPos(hWnd, NULL, x, y, width, height, SWP_NOZORDER);
    }
}

int main()
{
    HWND hWnd = GetForegroundWindow(); // 获取当前活动窗口的句柄

    // 设置窗口为非全屏状态，位置为(100, 100)，大小为800x600
    SetWindowNotFullScreen(hWnd, 100, 100, 800, 600);

    return 0;
}