[C#]Interprocess Communications (Data Copy)

Send:

using System.Runtime.InteropServices;

namespace WindowsFormsApplication_IPC_DataCopy_Send

{

    public partial class Form1 : Form

    {

        [DllImport("user32.dll")]

        static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, IntPtr lParam);

        [DllImport("user32.dll")]

        private static extern int SendMessage(IntPtr hwnd, uint wMsg, int wPar);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]

        static extern uint RegisterWindowMessage(string lpString);

        uint MSG_SHOW = RegisterWindowMessage("Show Message");

        [DllImport("user32.dll")]

        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            IntPtr nPrt = FindWindow(null, "TT");

            if(nPrt != IntPtr.Zero && textBox1.Text.Trim()!="")

            {

                try

                {

                    string tempword = textBox1.Text.Trim();

                    int iNum = int.Parse(tempword);

                    SendMessage(nPrt, MSG_SHOW, iNum , IntPtr.Zero);

                }

                catch(Exception ex)

                {

                    MessageBox.Show(ex.ToString());

                }

            }

        }

    }

}

Receive:

using System.Runtime.InteropServices;

namespace WindowsFormsApplication_IPC_DataCopy_Rec

{

    public partial class Form1 : Form

    {

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]

        static extern uint RegisterWindowMessage(string lpString);

        uint MSG_SHOW = RegisterWindowMessage("Show Message");

        public Form1()

        {

            InitializeComponent();

        }

        protected override void WndProc(ref Message m)

        {

            if(m.Msg==MSG_SHOW)

            {

                label1.Text = (string)m.WParam.ToString();

            }

            base.WndProc(ref m);

        }

    }

}

不錯的文章:

C# DllImport用法

http://pxnet2768.pixnet.net/blog/post/181105189-c%23%E7%9A%84dllimport%E7%94%A8%E6%B3%95

看範例學C#-20 兩個執行檔間數值的傳遞與接收

https://dotblogs.com.tw/hung-chin/2011/10/03/38641

[C#/Win32 API] SendMessage() 與 PostMessage()

http://catcsharp.blogspot.tw/2014/02/cwin32-api-sendmessage-postmessage.html