The OutputDebugStr Function

The OutputDebugStr function is similar to the OutputDebugString function provided by Windows, with the addition of the following enhancements:

You can call OutputDebugStr at interrupt time, so you can use it in low-level callback functions.

You can control the destination of output from OutputDebugStr with entries in the SYSTEM.INI file. You can turn the output off, or direct it to either the COM1 port or to a secondary monochrome display adapter.

Note:

Output from OutputDebugStr is available only in the debugging version of MMSYSTEM. You don't need to remove calls to OutputDebugStr from your application to run with the retail version of MMSYSTEM.