求判断是否全屏的方法

Question

我用代码模拟鼠标双击，使得第三方的视频播放器全屏播放或退出全屏，但是有时候会不成功。我现在的做法是如果没有全屏，则再次发送鼠标双击消息，直至成功为止。退出全屏状态时，也是如此。
问题是：我怎么判断当前的播放状态是否全屏的呢？播放方式有客户端软件的，也有网页播放的。求高手帮我想一个较稳妥的判断办法，谢谢！

Answer 1

全屏本身并没有这样的定义。如果当前窗口的大小和屏幕大小一样，并且没有标题栏，就可以认为是全屏了。用到的API
GetForegroundWindow()
GetWindowRect()
GetWindowLong()

Answer 2

public partial class 监测全屏程序 : Form
    {
        public 监测全屏程序()
        {
            InitializeComponent();
        }        private bool RunningFullScreenApp;
        int uCallBackMsg;        public class APIWrapper
        {
            [DllImport("SHELL32", CallingConvention = CallingConvention.StdCall)]
            public static extern uint SHAppBarMessage(int dwMessage, ref APPBARDATA pData);            [DllImport("User32.dll", CharSet = CharSet.Auto)]
            public static extern int RegisterWindowMessage(string msg);        }        [StructLayout(LayoutKind.Sequential)]
        public struct APPBARDATA
        {
            public int cbSize;
            public IntPtr hWnd;
            public int uCallbackMessage;
            public int uEdge;
            public RECT rc;
            public IntPtr lParam;
        }        public enum ABMsg : int
        {
            ABM_NEW = 0,
            ABM_REMOVE,
            ABM_QUERYPOS,
            ABM_SETPOS,
            ABM_GETSTATE,
            ABM_GETTASKBARPOS,
            ABM_ACTIVATE,
            ABM_GETAUTOHIDEBAR,
            ABM_SETAUTOHIDEBAR,
            ABM_WINDOWPOSCHANGED,
            ABM_SETSTATE
        }        public enum ABNotify : int
        {
            ABN_STATECHANGE = 0,
            ABN_POSCHANGED,
            ABN_FULLSCREENAPP,
            ABN_WINDOWARRANGE
        }        public enum ABEdge : int
        {
            ABE_LEFT = 0,
            ABE_TOP,
            ABE_RIGHT,
            ABE_BOTTOM
        }        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;            public override string ToString()
            {
                return "{left=" + left.ToString() + ", " + "top=" + top.ToString() + ", " +
                "right=" + right.ToString() + ", " + "bottom=" + bottom.ToString() + "}";
            }
        }        private void RegisterAppBar(bool registered)
        {
            APPBARDATA abd = new APPBARDATA();
            abd.cbSize = Marshal.SizeOf(abd);
            abd.hWnd = this.Handle;            if (!registered)
            {
                //register
                uCallBackMsg = APIWrapper.RegisterWindowMessage("APPBARMSG_CSDN_HELPER");
                abd.uCallbackMessage = uCallBackMsg;
                uint ret = APIWrapper.SHAppBarMessage((int)ABMsg.ABM_NEW, ref abd);
            }
            else
            {
                APIWrapper.SHAppBarMessage((int)ABMsg.ABM_REMOVE, ref abd);
            }
        }        protected override void WndProc(ref System.Windows.Forms.Message m)
        {
            if (m.Msg == uCallBackMsg)
            {
                switch (m.WParam.ToInt32())
                {
                    case (int)ABNotify.ABN_FULLSCREENAPP:
                        {
                            if ((int)m.LParam == 1)
                                this.RunningFullScreenApp = true;
                            else
                                this.RunningFullScreenApp = false;                            if (RunningFullScreenApp) //发现全屏，自己处理
                                listBox1.Items.Add(DateTime.Now.ToString());                            break;
                        }
                    default:
                        break;
                }
            }            base.WndProc(ref m);
        }        //开始监测
        private void 监测全屏程序_Load(object sender, EventArgs e)
        {
            this.RegisterAppBar(false);
        }        //取消监测
        private void 监测全屏程序_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.RegisterAppBar(true);
        }
    }

Answer 3

感谢你提供的准确的API！
“并且没有标题栏”，有办法判断吗？

Answer 4

GetWindowLong()传递GWL_STYLE
判断WS_CAPTION标志有没有。