The necessity: bloated/unnecessary/too many TRACE calls in the previously written code that disturb the debugging process.
How it works
The variable that controls the TRACE calls is
afxTraceEnabled. It is defined in the file C:\Program Files\Microsoft Visual Studio\VC98\MFC\Include\AFX.H (the default installation path of Visual C++ 6.0).
afxTraceEnabled flag is global, so it will affect all the TRACE calls.
__declspec(dllimport) extern BOOL afxTraceEnabled;
afxTraceEnabled = FALSE;
That is all. Here, the TRACE calls are suppressed and only the
OutputDebugString calls remain. The variable can be set/unset as and when necessary to allow or disable TRACE calls in certain sections, however this should be done by modifying the source code of all the files affected.
Another approach is to implement enable/disable of the flag in a separate file. Calling two functions, let' say
__DisableTrace allows the implementation to be controlled in a single place, and the source code of other files can call these functions as and when necessary.