[DllImport("User32.dll", EntryPoint = "SendMessage")]private static extern int SendMessage(IntPtr hWnd, // 信息發往的窗口的句柄 int Msg, // 消息ID int wParam, // 參數1 string lParam);[DllImport("User32.dll", EntryPoint = "SendMessage")]private static extern int SendMessage2(IntPtr hWnd, // 信息發往的窗口的句柄 int Msg, // 消息ID int wParam, // 參數1 IntPtr lParam);[DllImport("User32.dll", EntryPoint = "FindWindow")]private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);[DllImport("User32.dll", EntryPoint = "FindWindowEx")]private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpClassName, string lpWindowName);

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private void button4_Click(object sender, EventArgs e){IntPtr hwnd= FindWindow(null, "testForm");string info = "my info:ΑΒβδγζηθ";IntPtr pinfo= Marshal.StringToHGlobalAnsi(info);SendMessage2(hwnd, Form2.USERMESSAGEID, 12, pinfo);SendMessage(hwnd, Form2.USERMESSAGEID, 12, info);}

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public const int USERMESSAGEID =0x2021;protected override void WndProc(ref Message m){switch(m.Msg){case USERMESSAGEID:{int wparam= m.WParam.ToInt32();string str = Marshal.PtrToStringAnsi(m.LParam);break;}}base.WndProc(ref m);}

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[DllImport("User32.dll", EntryPoint = "SendMessage")]private static extern int SendMessage(IntPtr hWnd, // 信息發往的窗口的句柄 int Msg, // 消息ID int wParam, // 參數1 ref My_lParam lParam);

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IntPtr ptr = FindWindow(null, "主界面");SendMessage(ptr, MYMESSAGE, 1, ref m);//發送消息

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protected override void DefWndProc(ref Message m){try{switch (m.Msg){case MYMESSAGE:{My_lParam ml = new My_lParam();Type t = ml.GetType();ml = (My_lParam)m.GetLParam(t);break;}deafult ：base.DefWndProc(ref m);}catch(){ }}

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