/// <summary>
/// Receives a text from windows messageing system. Shows sender handler if available.
/// </summary>
/// <param name="lparam"></param>
/// <param name="sender"></param>
/// <returns></returns>
public static string ReceiveText(IntPtr lparam, out IntPtr sender)
{
user32.CopyDataStruct data = (user32.CopyDataStruct)Marshal.PtrToStructure(lparam, typeof(user32.CopyDataStruct));
string message = Marshal.PtrToStringUni(data.lpData);
int index = message.IndexOf("!");
sender = new IntPtr(int.Parse(message.Substring(0, index)));
string newText = message.Substring(index + 1);
return(newText);
}
/// <summary>
/// Sends text to recipient window adding sender address in it
/// </summary>
/// <param name="sender"></param>
/// <param name="recipient"></param>
/// <param name="text"></param>
public static void SendText(IntPtr sender, IntPtr recipient, string text)
{
Debug.Assert(recipient != IntPtr.Zero, "Recipient hWnd my not be zero");
Debug.Assert(!string.IsNullOrEmpty(text), "Send text may not be empty");
user32.CopyDataStruct cds = new user32.CopyDataStruct();
try
{
string newText = string.Format("{0}!{1}", sender, text);
cds.cbData = (newText.Length + 1) * 2;
cds.lpData = user32.LocalAlloc(0x40, cds.cbData);
Marshal.Copy(newText.ToCharArray(), 0, cds.lpData, newText.Length);
cds.dwData = (IntPtr)1;
user32.SendMessage(recipient, user32.WM_COPYDATA, IntPtr.Zero, ref cds);
}
finally
{
cds.Dispose();
}
}
