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From: risto@tuura.UUCP (Risto Lankinen)
Newsgroups: comp.windows.ms
Subject: Re: Show-stopper in wstdio.c/3.0 SDK tty sample app
Keywords: Win 3.0 SDK, tty sample app, wstdio.c, LocalAlloc, LocalLock
Message-ID: <772@tuura.UUCP>
Date: 25 Sep 90 07:30:13 GMT
References: <6589@sugar.hackercorp.com> <1990Sep24.201443.1377@sj.ate.slb.com>
Organization: Nokia Data Systems Oy
Lines: 33

poffen@sj.ate.slb.com (Russell Poffenberger) writes:

>In article <6589@sugar.hackercorp.com> karl@sugar.hackercorp.com (Karl Lehenbauer) writes:
>>The wstdio.c module in the tty sample application has some code that
>>is a guaranteed GP ever time.
>>
>>I guess just having a WNDCLASS structure created on the stack is no
>>good unless you know you're going to be large model only since
>>DS != SS.
>>

Hi!

It is possible to do a function, say, RegWinClassDirect(), which takes all
the members of WNDCLASS structure as parameters in the *opposite* order.
Make it in .ASM into a DLL and call the RegisterWindowClass() with the far
ptr parameter SS:BP+06 (which points to the 'structure' of WNDCLASS members
pushed to stack for RegWinClassDirect() ).  I've done it, and it hasn't
failed so far even without LockData() (*) .  And I think it even will not,
since RegisterWindowClass() is supposed not to call any functions such that
would trigger memory movement.  The only importance as far as I see is that
the correct (segment register of the) far pointer is passed.

Terveisin: Risto Lankinen

(*) footnote: For memory models, where DS==SS, I take for granted that the
LockData() also locks the value of SS , but how is the matter for DLL's for
example?
-- 
Risto Lankinen / product specialist ***************************************
Nokia Data Systems, Technology Dept *  2                              2   *
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