private void PostMessage(Process proc, string path)
{
string text = "aaaaa";
CopyDataStruc lParam = default(CopyDataStruc);
lParam.dwData = IntPtr.Zero;
lParam.lpData = text;
lParam.cbData = Encoding.Default.GetBytes(text).Length + 1;
NativeMethods.SendMessage(proc.MainWindowHandle, 170, 0, ref lParam);
}
public static extern int PostMessage(IntPtr hWnd, int Msg, int wParam, ref CopyDataStruc lParam);