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Asked: 2026-06-03T10:58:15+00:00

Im playing around in C# and want my little console program to spell my

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Im playing around in C# and want my little console program to spell my name in a notepad window I have open. I’ve got the window handle (IntPtr) but don’t really know what to do from here.

I could use SendKey but I want it to work whenever the notepad has focus or not, and as I understand it Senkey only work if you have the windowed focused 🙁

EDIT:
I’ve tried the following (trying to simulate pressing B):

PostMessage(NotepadWindowHandle, 0x100, 0x42, 0);
Thread.Sleep(1000);
PostMessage(NotepadWindowHandle, 0x101, 0x42, 0);

Nothing happens 🙁 And it does not break

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1 Answer

  1. Editorial Team

    You are correct, SendKey only works for focused windows.

    What you want to do is P/Invoke SendMessage and send WM_SETTEXT on the text box’s handle (note that that’s not the main window handle!). To get it you navigate down the window hierarchy until you reach it with GetWindow.

    As a freebie, to get the text box’s handle, simply call GetWindow with GW_CHILD on your main Notepad window handle and you’ll get it, it’s literally the first child.

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