How to enable the TRACE macro in Release mode?

mfc macros trace
Ashwin Nanjappa picture Ashwin Nanjappa · Aug 26, 2008 · Viewed 14.3k times · Source

The TRACE macro can be used to output diagnostic messages to the debugger when the code is compiled in Debug mode. I need the same messages while in Release mode. Is there a way to achieve this?

(Please do not waste your time discussing why I should not be using TRACE in Release mode :-)

Answer

Ferruccio picture Ferruccio · Sep 3, 2008

Actually, the TRACE macro is a lot more flexible than OutputDebugString. It takes a printf() style format string and parameter list whereas OutputDebugString just takes a single string. In order to implement the full TRACE functionality in release mode you need to do something like this:

void trace(const char* format, ...)
{
   char buffer[1000];

   va_list argptr;
   va_start(argptr, format);
   wvsprintf(buffer, format, argptr);
   va_end(argptr);

   OutputDebugString(buffer);
}

Related questions

Redefining or changing macro value

I am currently working on an already developed project written in MFC C++ and am facing a problem with an already present macro having the definition: #define HEIGHT_TESTS 13 I am trying to change the value from within the code …

Read More
Private and Protected Members : C++

Can someone enlighten me as to the difference between private and protected members in classes? I understand from best practice conventions that variables and functions which are not called outside the class should be made private - but looking at …

Read More
How do you convert CString and std::string std::wstring to each other?

CString is quite handy, while std::string is more compatible with STL container. I am using hash_map. However, hash_map does not support CStrings as keys, so I want to convert the CString into a std::string. Writing a …

Read More