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From: rimola@solrac.metaphor.com (Carlos Alberto Rimola)
Newsgroups: comp.os.os2.misc,comp.os.os2.programmer
Subject: Re: Programming Graphics in PM?
Message-ID: <1933@metaphor.Metaphor.COM>
Date: 21 Dec 90 20:06:59 GMT
References: <1990Dec16.233203.20196@eecs.wsu.edu>
Sender: news@metaphor.Metaphor.COM
Reply-To: rimola@solrac.metaphor.com (Carlos Alberto Rimola)
Organization: Metaphor Computer Systems, Mountain View, CA
Lines: 26

In article <1990Dec16.233203.20196@eecs.wsu.edu> wbonner@eecs.wsu.edu (Wim Bonner) writes:
-I am having a problem programming some graphics in Pm.
- 
-I have a series of things to do in a switch statement depending on  what
-message comes in.  On most of  the options, the action is taken care  of
-in the case statement, but in one case I am calling an external  routine
-caller "fire".  One of the parameters  that is being passed to it is  an
-HWND type, as I  thought this should allow  me to call WinBeginPaint  on
-that space and draw in it, but  I can't seem to get anything to  show up
-on the  window.   I have  a beep  in the  routine, so  I know that it is
-getting to the routine.
- 
-Anything obvoious that I may be doing wrong?
- 
-Wim.
--- 
-|  wbonner@yoda.eecs.wsu.edu  |
-| 27313853@wsuvm1.csc.wsu.edu |
-|   27313853@Wsuvm1.BITNET    |
-|  72561.3135@CompuServe.com  |

I am not a PM expert but I am fairly certain that unless you are dealing
with a WM_PAINT message you can/should not use WinBeginPaint/WinEndPaint to
draw on a presentation space.  Instead, you should use WinGetPS/WinReleasePS
to get the handle to the PS and use that in your drawing calls.  I have
used this method during WM_TIMER messages without any problems.