使用copydata实现进程之间数据传递

Winform to Winfrom==>

发送端==》

using System;
using System.Runtime.InteropServices;

namespace CopyData.Sender
{
    public partial class Form1 : System.Windows.Forms.Form
    {
        const int WM_COPYDATA = 0x004A;
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(
            int hWnd, // handle to destination window
            int Msg, // message
            int wParam, // first message parameter
            ref COPYDATASTRUCT lParam // second message parameter
        );

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string
            lpWindowName);

        private void button1_Click(object sender, System.EventArgs e)
        {
            int WINDOW_HANDLER = FindWindow(null, @"Form1");
            if (WINDOW_HANDLER == 0)
            {
            }
            else
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text);
                int len = sarr.Length;
                COPYDATASTRUCT cds;
                cds.dwData = (IntPtr)100;
                cds.lpData = this.textBox1.Text;
                cds.cbData = len + 1;
                SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
            }
        }
    }
}

接收端==》

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace CopyData.Receiver
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        const int WM_COPYDATA = 0x004A;
        //[StructLayout(LayoutKind.Sequential)]
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

        protected override void DefWndProc(ref System.Windows.Forms.Message m)
        {
            switch (m.Msg)
            {
                //接收自定义消息 USER，并显示其参数
                case WM_COPYDATA:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();

                    mystr = (COPYDATASTRUCT)m.GetLParam(mytype);
                    this.textBox1.Text = mystr.lpData;

                    break;
                default:
                    base.DefWndProc(ref m);
                    break;
            }
        }
    }

   
}

运行效果如下：

注意：

int WINDOW_HANDLER = FindWindow(null, @"Form1"); —— 用于确定发送方发送数据到其他进程的某个标题为Form1的窗体。

2.delhpi程序与C#程序进行消息发送时，出现如下问题，解决思路？

a.安装.netframework

b.检查delphi以及C#程序（例如，delphi==>cdds.cbData := length(Edit1.Text)+1;cdds.lpData := pchar(Edit1.Text);)是否正确？

WPF to Winfrom to WPF==>

发送方： WPF to WinFrom

private void QueueCode(int queueType)
        {
            IntPtr hwnd = ((HwndSource)PresentationSource.FromVisual(this)).Handle;
            int sendHandle = hwnd.ToInt32();
            int WINDOW_HANDLER = FindWindow(null, @"Form1");
            if (WINDOW_HANDLER == 0)
            {
                StartQueueExe();
                WINDOW_HANDLER = FindWindow(null, @"Form1");
            }

            string queueName = this.cbQueue.Text;
            queueName = queueType + "^" + this.cbQueue.Text + "^" + sendHandle;
            if (WINDOW_HANDLER == 0) { }
            else
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(queueName);
                int len = sarr.Length;
                COPYDATASTRUCT cds;
                cds.dwData = (IntPtr)100;
                cds.lpData = queueName;
                cds.cbData = len + 1;
                SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
            }

            var hwndSource = (HwndSource)HwndSource.FromVisual(this);
            hwndSource.AddHook(new HwndSourceHook(WndProc));
        }

        private void StartQueueExe()
        {
            string filePath = AppDomain.CurrentDomain.BaseDirectory + "TEST.exe";
            System.Diagnostics.Process p = new System.Diagnostics.Process();
            p.StartInfo.FileName = filePath;
            p.StartInfo.UseShellExecute = false;    //是否使用操作系统shell启动
            p.StartInfo.RedirectStandardInput = true;//接受来自调用程序的输入信息
            p.StartInfo.RedirectStandardOutput = true;//由调用程序获取输出信息
            p.StartInfo.RedirectStandardError = true;//重定向标准错误输出
            p.StartInfo.CreateNoWindow = true;//不显示程序窗口
            p.Start();//启动程序
            Thread.Sleep(500);
        }

        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            switch (msg)
            {
                case WM_COPYDATA:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    COPYDATASTRUCT cds = (COPYDATASTRUCT)Marshal
                        .PtrToStructure(lParam, typeof(COPYDATASTRUCT));
                    this.lblQueueMessage.Content = cds.lpData;
                    break;
                default: break;
            }
            return (System.IntPtr)0;
        }

 接收方：WinFrom获取

  #region 获取消息
        /// <summary>
        /// 0x004A
        /// </summary>
        const int WM_COPYDATA = 0x004A;
        //[StructLayout(LayoutKind.Sequential)]
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

        protected override void DefWndProc(ref System.Windows.Forms.Message m)
        {
            try
            {
                switch (m.Msg)
                {
                    //  接收自定义消息 USER，并显示其参数
                    case WM_COPYDATA:
                        COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                        Type mytype = mystr.GetType();
                        mystr = (COPYDATASTRUCT)m.GetLParam(mytype);
                        ReceiveMessage = mystr.lpData;
                        break;
                    default:
                        base.DefWndProc(ref m);
                        break;
                }
            }
            catch { return; }
        }

        #endregion

Winfrom to WPF

   private static string FormTitle = "Form1";
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(
            int hWnd, // handle to destination window
            int Msg, // message
            int wParam, // first message parameter
            ref COPYDATASTRUCT lParam // second message parameter
        );

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string lpWindowName);

public bool SendMessage(int value, int queueType)
        {
            try
            {
                StringBuilder content = new StringBuilder();
                if (value != 0)//没有全部被预约
                {
                    // string appointTimes = DateTime.Now.ToLongTimeString().ToString();
                    if (string.IsNullOrEmpty(CurrentDate)) CurrentDate = DateTime.Now.ToShortDateString();
                    int num = DBQSQueueBusiness.GetCountByCondition(QueueId, CurrentDate);

                    CurrentDate = DateTime.Parse(CurrentDate).ToString("yyyy-MM-dd");
                    content.Append(CurrentDate);//日期
                    content.Append("^");
                    content.Append(CurrentTimePart);//描述appointTimes
                    content.Append("^");
                    content.Append(value);//号
                    content.Append("^");
                    content.Append(QueueId);//队列
                    content.Append("^");

                    if (queue == null) queue = new V_Queue();
                    queue.ENROLDATE = CurrentDate;
                    queue.APPOINTTIME = CurrentTimePart;//appointTimes
                    queue.SORTNO = value;
                }
                else content.Append("0");

                //int WINDOW_HANDLER = FindWindow(null, @FormTitle);
                int WINDOW_HANDLER = int.Parse(FormTitle);
                if (WINDOW_HANDLER == 0) { }
                else
                {
                    byte[] sarr = System.Text.Encoding.Default.GetBytes(content.ToString());
                    int len = sarr.Length;
                    COPYDATASTRUCT cds;
                    cds.dwData = (IntPtr)100;
                    cds.lpData = content.ToString();
                    cds.cbData = len + 1;
                    SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
                }
            }
            catch { return false; }
            return true;
        }

WPF 接收方：

 #region 定义常量消息值
        public const int WM_GETTEXT = 0x0D;
        public const int WM_SETTEXT = 0x0C;
        public const int WM_SIZEING = 0x0214;
        public const int WM_COPYDATA = 0x004A;
        public const int WM_LBUTTONDBLCLK = 0x0203;
        #endregion

        #region 定义结构体
       public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }
        #endregion

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            HwndSource hWndSource;
            WindowInteropHelper wih = new WindowInteropHelper(this);
            hWndSource = HwndSource.FromHwnd(wih.Handle);
            //添加处理程序 
            hWndSource.AddHook(Test);
        }
        private IntPtr Test(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            switch (msg)
            {
              
                case WM_COPYDATA:
                    {

                        COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                        Type mytype = mystr.GetType();

                        COPYDATASTRUCT MyKeyboardHookStruct = (COPYDATASTRUCT)Marshal.PtrToStructure(lParam, typeof(COPYDATASTRUCT));
                         this.textbox.Text = MyKeyboardHookStruct.lpData;
                        break;

                    }
                     default:
                    {
                             break;
                    }


            }
            return IntPtr.Zero;
        }