howto: Preprocessor Directives inside #define statements

[AMosmann]

Hi, I want to write a #define-macro that, depending on other defines, TRACEs some text into a file.
No way to find an explaining, how to use precompiler directives inside a #define- Macro.

A define like

#define ZTRACE(LEVEL,STRING) #ifndef TRACELEVEL #define TRACELEVEL 1 #endif

gives an error C2162, and I do not know, what to do...
I tried a lot...

Many thanks




Greetings Andreas

 

[palbano]

Flip your design around

#ifndef TRACELEVEL
#define TRACELEVEL 1
#endif

#define ZTRACE(LEVEL,STRING) ... rest of macro

-pete

 

[AMosmann]

sorry, it is not the same.

>#ifndef TRACELEVEL
>#define TRACELEVEL 1
>#endif

>#define ZTRACE(LEVEL,STRING) ... rest of macro

...

#undef TRACELEVEL
ZTRACE(1,"Any String" // will cause an error, if I use TRACELEVEL in the MACRO

but thx anyway, pete


Greetings Andreas