Hi,i dont know if it should be here or it was answered before,google didnt really help. I am trying to make a log(char *ctrlstr,...); It should take the same parameters as ANSI C printf() or something similar I see that way easier to debug,because i can know exactly where the process halted,or it'll help on error messages like "not enough memory","texture not found"; The problem is re-passing the arguments. void log(char *ctrlstr,...) {FILE *f; f=fopen("error.log","a"); if(f==NULL) return; fprintf(f,ctrlstrl, ??? ); fclose(f); } how to pass the arguments to fprintf ,something to replace the "???" place or analogous version. I couldnt find it in books,and yes,i need to use printf, i dont want the c++ implementations with streams,<< or something. Thanks in advance

Consider using vfprintf().

From my code:
Where Log() just logs a normal const char* (You'd replace that with your call to fwrite() or whatever.

Thanks ;)