Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!vsi1!hsv3!jls
From: jls@hsv3.UUCP (James Seidman)
Newsgroups: comp.windows.ms.programmer
Subject: Re: Creating windows with a specified client size
Message-ID: <5697@hsv3.UUCP>
Date: 9 Nov 90 16:55:58 GMT
References: <18647@haddock.ima.isc.com> <1990Nov8.180215.10952@rti.rti.org>
Reply-To: jls@hsv3.UUCP (James Seidman)
Organization: Video Seven / Headland Technology
Lines: 24

In article <1990Nov8.180215.10952@rti.rti.org> bcw@rti.rti.org (Bruce Wright) writes:
>You do run into a minor problem when you are trying to create a 
>window with a specific size in (say) inches rather than pixels:  
>the LPtoDP function requires a Device Context (which you can't get
>until you create the window).  In that case you either have to
>make the computation manually from information returned by
>GetSystemMetrics and GetDeviceCaps, or use SetWindowPos after the 
>window has been created (presumably without being displayed) and 
>you have called LPtoDP, or play games such as getting the desktop 
>window with GetDesktopWindow and using it for a Device Context.  

I don't have the SDK reference in front of me, so I might be wrong here,
but I think that you can call LPtoDP with an *Information Context* as
opposed to a Device Context.  ICs are designed to be used in just these
sorts of cases where you run into a Catch-22 on needing information on
a DC before you create it.  More information should be under the command
"CreateIC()" in the reference manual.  I believe Petzold also gives
examples of using ICs for such things.

-- 
Jim Seidman (Drax), the accidental engineer.
"It doesn't have to work... they'll be paralyzed just from laughing at me."
							- Dr. Who, _Shada_
UUCP: ames!vsi1!hsv3!jls	         INTERNET: hsv3.UUCP!jls@apple.com