How do you find when a user presses 'H'?

[JoorDovah]

I'm using Win32 and want it to create a MessageBox when a user presses 'H'. How do I do this?

[CoderJames]

Where is the input coming from? Command line? Form element? Or do you want a message box to display whenever a user presses H in any application (bad idea btw)?

[freddie1]

You need to handle WM_CHAR messages in your Window Procedure. The character code will come through in the WPARAM parameter, and you can test for that.