From:	"David Whitcombe" <mxedisn AT rof DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro: How to wrap "..." argumentlist
Date:	Wed, 30 Jun 1999 23:46:54 -0600
Organization:	Rocky Mountain Internet - 1(800)-900-RMII
Lines:	51
Message-ID:	<7levm8$kn3$1@news1.rmi.net>
References:	<8D53104ECD0CD211AF4000A0C9D60AE30146182F AT probe-2 DOT acclaim-euro DOT net>
NNTP-Posting-Host:	209.38.35.81
X-Trace:	news1.rmi.net 930808328 21219 209.38.35.81 (1 Jul 1999 05:52:08 GMT)
X-Complaints-To:	abuse AT rmi DOT net
NNTP-Posting-Date:	1 Jul 1999 05:52:08 GMT
X-Newsreader:	Microsoft Outlook Express 4.72.3155.0
X-MimeOLE:	Produced By Microsoft MimeOLE V4.72.3155.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Shawn Hargreaves wrote in message
<8D53104ECD0CD211AF4000A0C9D60AE30146182F AT probe-2 DOT acclaim-euro DOT net>...
>A. Jans-Beken writes:
>>This works all fine. But now I want to wrap this function...
>>
>> textprintf(BITMAP *bmp, FONT *f, int x, y, color, char *fmt, ...);
>>
>>I do not understand how to do this. The C++ primer that I have (old
>>edition) is inconclusive. A gues would be:
>>
>>   void textprintf(int x, y, color, char *fmt, ... ) {
>>      ::textprintf(bob, font, x, y, color, fmt, ... );
>>      }
>
>Alternatively, there is a gcc extension that can help with this
>situation: see info "c extensions" "constructing calls". I'm not
>sure if this will work with a C++ method, though.
>
>

Sorry if this is off topic, but when I wrapped textprintf() into my own
Allegro class, I just ended up calling va_start() and vsprintf()...

I have a BmpType class with a member function Printf(const char *fmt, ...)
It looks kinda like this:

void BmpType::Printf(const char *format, ...)
{
   char *buffer = new char[2048];
   va_list arg;
   va_start(arg, format);
   vsprintf(buffer, format, arg);
   va_end(arg);
   Print(buffer);
   // buffer is de-allocated automatically when it goes out of scope.

}

Of course, if you're gonna print more than 2k strings, you need to do
something clever :)

(Or just not print such huge damned strings :)





> Shawn Hargreaves.

- Raw text -