学步园

#region 向进程发送消息 const int WM_COPYDATA = 0x004A; [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 struct COPYDATASTRUCT { public IntPtr dwData; public int cbData; [MarshalAs(UnmanagedType.LPStr)] public string lpData; } #endregion//在需要调用的地方添加代码： private void button1_Click(object sender, EventArgs e) { //int WINDOW_HANDLER = FindWindow(null, @"接受方窗体的text属性"); int WINDOW_HANDLER = FindWindow(null, @"Frmbbb"); if (WINDOW_HANDLER != 0) { byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text); int len = sarr.Length; COPYDATASTRUCT cds; cds.dwData = (IntPtr)100; cds.lpData = "这里是传送的消息"; cds.cbData = len + 1; SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds); } }

接受方：

#region 接受方接受传来的消息 const int WM_COPYDATA = 0x004A; protected override void DefWndProc(ref System.Windows.Forms.Message m) { switch (m.Msg) { case WM_COPYDATA: COPYDATASTRUCT mystr = new COPYDATASTRUCT(); Type mytype = mystr.GetType(); mystr = (COPYDATASTRUCT)m.GetLParam(mytype); this.textBox1.Text = mystr.lpData;//要接受消息的地方 break; default: base.DefWndProc(ref m); break; } } public struct COPYDATASTRUCT { public IntPtr dwData; public int cbData; [MarshalAs(UnmanagedType.LPStr)] public string lpData; } #endregion

这样就可以在两个进程之间通信了