IPC in C#, sending text from one exe to another exe

Question

I would like to send a message from a WPF application's textbox to an open notepad. After I click the button next to the the textbox, I would like the content is written into the notepad, I mean.

How can I send messages between 2 different applications ?

This should get you started: http://stackoverflow.com/questions/6604070/write-text-to-notepad-with-c-win32 — Nick Sinas, May 11 '12 at 16:19
I just set these stuff aside for only a few months, now I am like a complete idiot about them. Thanks everyone. — Pevus, May 11 '12 at 16:26
Please decide if your question is "how to send text to notepad" or "how to do IPC". (Side note: Consider deleting your comments and merge them into the question instead). — Alexei Levenkov, May 11 '12 at 16:50

score 2 · Accepted Answer · answered May 11 '12 at 16:21

[DllImport("user32.dll", EntryPoint = "FindWindowEx")]
public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

[DllImport("User32.dll")]
public static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, string lParam);

private static void DoSendMessage(string message)
{
    Process notepad = Process.Start(new ProcessStartInfo("notepad.exe"));
    notepad.WaitForInputIdle();

    if (notepad != null)
    {
        IntPtr child = FindWindowEx(notepad.MainWindowHandle, new IntPtr(0), "Edit", null);
        SendMessage(child, 0x000C, 0, message);
    }
}

score 1 · Answer 2 · answered May 11 '12 at 16:16

1

For sending data between two applications you control, you could use NamedPipeClientStream and NamedPipeServerStream

answered May 11 '12 at 16:16

tom502

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IPC in C#, sending text from one exe to another exe

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