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From: bdlepla@caen.engin.umich.edu (Bryan Dennis Lepla)
Newsgroups: comp.windows.ms
Subject: Re: Getting simple debug output
Summary: Use MessageBox(...
Message-ID: <1990Sep3.213733.16037@caen.engin.umich.edu>
Date: 3 Sep 90 21:37:33 GMT
References: <1990Aug3.184951.5599@cs.umn.edu>
Sender: news@caen.engin.umich.edu (CAEN Netnews)
Organization: The University of Michigan, Ann Arbor
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In article <1990Aug3.184951.5599@cs.umn.edu>, wytten@cs.umn.edu (Dale Wyttenbach) writes:
> I'm a experienced X11 programmer trying to write my first MSW
> program, and having a difficult time getting simple debug
> output from my program.  (I'm trying to avoid learning yet
> another debugger)
> 
> Right now I'm just opening a file called debug.txt and writing
> stuff into that, but I'd like to have a quickie function that
> pops up a dialog box with a message, sort of like this:
> 
> sprintf(buf,"a= %d, b=%d",a,b);
> debugwin(buf);
> 
> I would like to do this with a dialog box, but I don't know if you can
> pass the buf in since dialog boxes are defined in the .rc file.
> (Remember I'm brand new at this) Does anyone have something like this
> they would share?  Any better ideas?  "debug" doesn't appear in the
> index of any of the manuals we got with the SDK.
> 
> Thanks,
> 
> Dale Wyttenbach
> wytten@cs.umn.edu

Dale, you're on the right track.  Use MessageBox instead.

MessageBox(hWnd, buf, "Caption",MB_OK);

where hWnd is the handle to the window that creates this message box.
It will create a box with your message and will wait until you hit return.

I got this straight out of Petzold's book _Programming Windows_.  I highly 
recommend it.  (Or wait a couple months for his 3.0 update.)