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I have a Windows Forms app and print a message using OutputDebugString() whenever a button is pressed. However I don't see any output in the output or immediate window in Visual Studio. Stepping through the program shows OutputDebugString() is executed. I tested OutputDebugString() in a regular console app and it worked, so what could be the problem?
Make sure it is going to the output window and not the immediate window. In 2005 there was a setting to make all output go to the immediate window or the output window. Not sure about 2008.
When I tested it on a console app OutputDebugString() went to output (not immediate). However, I have both windows open so I should see it being printed since it either goes to one or the other (for the Windows Forms app).