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example for a variable parameter list function?

Posted on 2001-06-19
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Last Modified: 2010-04-15
basically I'd like to re-direct the fprintf function..
to allow me a little more control of error messages.

the idea is simple, write a new function

flogf( "a format string - %s %d %c \n", var1, var2,... );

then define flogf to pass these variables through and write to either stderr, to a file, or both depending on the configuration...

Does anyone have an example to illustrate how this is done?

thx, George
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Question by:gljr
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4 Comments
 
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Accepted Solution

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jkr earned 50 total points
ID: 6207525
Sure, just use a function similar to this one:

#define LOG_REPORT_BUFSIZE      2048    //  way too big, but as anything
                                       //  may be passed in...

void    __cdecl DbgPrintf       (   char*   __pszFormat,    ...)
{
   static  char    s_acOutput      [   LOG_REPORT_BUFSIZE  +   MAX_PATH];
   static  char    s_acBuf         [   LOG_REPORT_BUFSIZE];

   va_list         args;

   va_start    (   args,   __pszFormat);

   vsprintf   (   s_acBuf,    __pszFormat,    args);

   sprintf    (   s_acOutput,
                   "%s%s",
                   s_acBuf,
                   strchr  (   s_acBuf,    '\n')   ?   "\0"    :   "\r\n"
               );

   // wite 's_acOutput' to file, stderr, or to what you want :o)

   va_end  (   args);
}
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LVL 86

Expert Comment

by:jkr
ID: 6212483
Is there anything else you'd like to know?
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Author Comment

by:gljr
ID: 6224881
Thanks jkr,

Actually, I found a similar example about the same time
you published this one.. and I don't think it will be efficient to use this right now.. but I really do apreciate your promtness :-)

George
0
 

Author Comment

by:gljr
ID: 6224882
Thanks jkr,

Actually, I found a similar example about the same time
you published this one.. and I don't think it will be efficient to use this right now.. but I really do appreciate your promtness :-)

George
0

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