🚀 go-pugleaf

In article <1992Aug10.162757.13720@thyme.jpl.nasa.gov> kaleb@thyme.jpl.nasa.gov (Kaleb Keithley) writes:
>
>Question 1: Given the following code fragment...
>
>MRESULT EXPENTRY ClientWndProc (
>    HWND     hwnd,
>    USHORT   msg,
>    MPARAM   mp1,
>    MPARAM   mp2)
>{
>    ...
>    switch (COMMANDMSG (&msg)->cmd) {
>    ...
>
>the compiler complains vociferously about the above line of code.  I
>regret that I can't supply the actual error text, it was at home, and
>late at night.  I was unable to find the prototype declaration or macro 
>definition for COMMANDMSG.  The above is exactly as it appears in the
>article, but I suspect that I might actually need '(COMMANDMSG (&cmd))->cmd'.
>
>Would someone be so kind as to confirm this, or tell me wherein COMMANDMSG
>is defined (I looked, but didn't find it), or tell me that COMMANDMSG is 
>the wrong way to be doing this in 2.0 and tell me what the right way is?

The first thing I noticed is that the "msg" parameter is a USHORT.
Under 32-bit OS/2, it should be a ULONG.

As for the COMMANDMSG macro, I never used it.  I always just did a
"switch (msg)".  I believe the COMMANDMSG macro is used to extract
more detail from a WM_COMMAND message.

>Question 2:  99% of my GUI experience is with the X Window System.  The
>Petzold article touches on window classes, and being able to subclass
>windows.  Furthermore, the main() function in his example program bears
>a strong resemblance to the main() functions of the Xt based applications
>that I write.
>
>By contrast, when I examined the M's*ft Windows 3.0 SDK, my impression was 
>that programming Windows was akin to programming X at the Xlib level, 
>leading me to believe that programming for PM may be more like programming 
>in Xt with a Widget set.  Would anyone care to confirm or deny that 
>assessment?  

It sounds about right.  I don't know how many parallels you can draw,
since X is a client-server model, while OS/2 and Windows aren't.  What
I did notice from the Windows 3.0 spec, was that user programs have to
perform lower-level tasks than OS/2 programs have to.

>Question 3:  What's the name of a good book on PM programming?  Bookstar
>(large, well stocked, discount retailer) had zillions of Wind*ws 3.1 books,
>and only three titles on OS/2 -- none on programming.  Anyone know of any
>books in the works?

Not too many right now.  The Microsoft Press books seem to have been
discontinued (I wonder why...).  Van Nostrand-Reinhold publishing has
recently released a series on OS/2 2.0 (including some programming
books).  IBM has their technical library (individual volumes can be
gotten), although they're better as reference material.

Some OS/2 1.x books can be gotten.  They are useful to learn concepts,
but you'll need a 2.0 reference (like the on-line one shipped with the
Toolkit) in order to get the sample code to work in 32-bits.

-- 
   |)  David Charlap           "I don't even represent myself
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