WPF 点击图标显示存在的托盘程序

最新推荐文章于 2024-07-13 13:44:04 发布

原创最新推荐文章于 2024-07-13 13:44:04 发布 · 379 阅读

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#wpf

该代码段展示了如何在WPF中检查同一进程是否已运行，并通过发送WM_COPYDATA消息与已存在的实例通信。如果程序已运行，它将找到窗口句柄并发送消息，然后关闭当前实例；否则，它会启动新实例。

WPF 点击图标显示已存在的程序

一.判断进程是否已存在并发送信息

Process current = Process.GetCurrentProcess();
            LogUtils.e("进程名称:" + current.ProcessName);
            Process[] ps = Process.GetProcessesByName(current.ProcessName);
            Console.WriteLine("进程长度:" + ps.Length);
            LogUtils.e("程序：" + targetExeName + "=" + productName);
            if (ps.Length > 1)
            {
                //程序已存在
                //查找已存在的程序
                CallBack myCallBack = new CallBack(FineAppWindow);
                EnumWindows(myCallBack, 0);
                //发送信息
                sendMessage(hWnd, "222");
                //关闭当前的程序
                Environment.Exit(0);
            }
            else
            {
                //启动软件
            }

二.获取程序的句柄方法

		private static string strProcessName = 当前程序的strProcessName;
        static IntPtr hWnd;
        public class MessageHelper
        {
            public const int WM_COPYDATA = 438;
        }

        public void sendMessage(IntPtr hwnd, string strMsg)
        {
            if (hwnd != IntPtr.Zero)
            {
                CopyDataStruct cds;
                cds.dwData = IntPtr.Zero;
                cds.lpData = strMsg;
                //注意：长度为字节数
                cds.cbData = System.Text.Encoding.Default.GetBytes(strMsg).Length + 1;
                // 消息来源窗体
                int fromWindowHandler = 0;
                SendMessage(hwnd, 438, fromWindowHandler, ref cds);
            }
        }

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage
            (
            IntPtr hWnd,                   //目标窗体句柄
            int Msg,                       //WM_COPYDATA
            int wParam,                    //自定义数值
            ref CopyDataStruct lParam      //结构体
            );
        [StructLayout(LayoutKind.Sequential)]
        public struct CopyDataStruct
        {
            public IntPtr dwData;
            public int cbData;//字符串长度

            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;//字符串
        }

        [DllImport("user32.dll", EntryPoint = "ShowWindow")]
        public static extern int ShowWindow(int hwnd, int nCmdShow);

        [DllImport("user32")]
        public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

        [DllImport("user32")]
        public static extern int EnumWindows(CallBack x, int y);

        public delegate bool CallBack(IntPtr hWnd, int lParam);

        public static bool FineAppWindow(IntPtr hwnd, int lParam)
        {

            StringBuilder sb = new StringBuilder(200);
            //获取winform的title  与 	strProcessName比较
            int n = GetWindowText(hwnd, sb, 200);  
            Console.WriteLine("句柄获取:" + hwnd + "=" + sb.ToString());
            if (sb.ToString() == strProcessName)
            {
                Console.WriteLine("句柄获取成功");
                hWnd = hwnd;
            }
            return true;
        }

三.接收数据

在Window中添加Initialized监听

this.SourceInitialized += win_SourceInitialized;

win_SourceInitialized具体实现

private void win_SourceInitialized(object sender, EventArgs e)
        {
            HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
            if (hwndSource != null)
            {
                hwndSource.AddHook(new HwndSourceHook(WndProc));
            }
        }

private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
           
            switch (msg)
            {
            	//此处对信息进行区分
                case MessageHelper.WM_COPYDATA:
                    //LogUtils.e("启动成功!!");
                    this.Show();
                    this.WindowState = WindowState.Normal;
                    break;

            }
            return IntPtr.Zero;
        }