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Asked: 2026-05-15T13:15:23+00:00

I have a string of values, and I want to simulate key press events

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I have a string of values, and I want to simulate key press events in a window for each character.

I plan on sending WM_KEYDOWN, WM_CHAR, and WM_KEYUP events to the window (as that is what seems to happen whan a key is manually pressed).

Those messages require an int be sent in the wParam based on a table of virtual key codes. I can loop through the string and get each character, but how do I take that character and convert it to a value that corresponds to the virtual key code? Convert.ToInt32() does not work.

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1 Answer

  1. Editorial Team

    Sending WM_KEYDOWN/UP is troublesome. The application itself already translates the WM_KEYDOWN message into WM_CHAR, using the state of the modifier keys (Shift, Alt, Ctrl) and the keyboard layout. Neither of which you can control, you’ll get the wrong character, randomly.

    Just send WM_CHAR messages, set the wparam to the character code. No need to worry about lparam, few apps ever use it.

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