C# WinForm : 判 断 当 前 是 否 有 全 屏 程 序 (如 魔 兽 争 霸) 运 行
C# WinForm:
程序中需要一个函数来判断当前是否有全屏程序运行，不是指我的C#程序的窗口是不是全屏，而是判断外界的程序
如我的C#程序开在那 如果你要打开全屏游戏比如魔兽争霸之类的的时候 要在我的C#程序里得知 然后将this.Text="有全屏程序运行"；
请问是否有相关的帮助资料或直接可用的API函数等 如果涉及系统钩子的话 希望可以给点示例代码 谢谢

[解决办法]

C# code

        //获取窗体大小的API        [DllImport("user32")]        static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);        //RECT结构体定义        [StructLayout(LayoutKind.Sequential)]        public struct RECT        {            public int Left;            public int Top;            public int Right;            public int Bottom;        }                        //屏幕大小            Rectangle rect = Screen.PrimaryScreen.Bounds;            foreach (Process p in Process.GetProcesses())            {                //找到想要的进程                if(p.ProcessName == "Maxthon")                {                    RECT r;                    GetWindowRect(p.MainWindowHandle,out r);                    //比较                    if((r.Right - r.Left) >= rect.Width && (r.Bottom - r.Top) >= rect.Height)                    {                        //to do,这种情况肯定已经是全屏了                       }                }            }
[解决办法]
要用API，c#本身办不到  

首先声明一个结构，API函数要用到  
C# code
        [StructLayout(LayoutKind.Sequential)]         public struct RECT         {                public int Left;                public int Top;                public int Right;                public int Bottom;         }                 //取得前台窗口句柄函数         [DllImport("user32.dll")]         private static extern IntPtr GetForegroundWindow();         //取得桌面窗口句柄函数         [DllImport("user32.dll")]         private static extern IntPtr GetDesktopWindow();         //取得Shell窗口句柄函数         [DllImport("user32.dll")]         private static extern IntPtr GetShellWindow();         //取得窗口大小函数         [DllImport("user32.dll", SetLastError = true)]         private static extern int GetWindowRect(IntPtr hwnd, out RECT rc);                 //桌面窗口句柄         private IntPtr desktopHandle; //Window handle for the desktop          //Shell窗口句柄         private IntPtr shellHandle; //Window handle for the shell  因为桌面窗口和Shell窗口也是全屏，要排除在其他全屏程序之外。               //取得桌面和Shell窗口句柄             desktopHandle = GetDesktopWindow();             shellHandle = GetShellWindow();             //取得前台窗口句柄并判断是否全屏             bool runningFullScreen = false;              RECT appBounds;             Rectangle screenBounds;             IntPtr hWnd;             //取得前台窗口             hWnd = GetForegroundWindow();             if (hWnd != null && !hWnd.Equals(IntPtr.Zero))             {                 //判断是否桌面或shell                        if (!(hWnd.Equals(desktopHandle) ¦ ¦ hWnd.Equals(shellHandle)))                 {                     //取得窗口大小                     GetWindowRect(hWnd, out appBounds);                     //判断是否全屏                     screenBounds = Screen.FromHandle(hWnd).Bounds;                     if ((appBounds.Bottom - appBounds.Top) == screenBounds.Height && (appBounds.Right - appBounds.Left) == screenBounds.Width)                         runningFullScreen = true;                 }             }