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From: Thomas_Hornschuh@p1.f36.n245.z2.fidonet.org (Thomas Hornschuh)
Newsgroups: comp.windows.ms.programmer
Subject: Re: How to use GlobalDosAlloc()?
Message-ID: <233261954@p1.f36.n245.z2.fidonet.org>
Date: 12 Jun 91 21:34:51 GMT
Reply-To: Thomas_Hornschuh%p1.f36.n245.z2@hippo.dfv.rwth-aachen.de (Thomas Hornschuh)
Organization: Thomas Hornschuh, SoftStream Development, FRG
Lines: 41
Comment-To: Don_Wilcox@f1.n6000.z2.fidonet.org (Don Wilcox)

DW> Another question on talking to TSRs.  I have attempted to use a block of
DW> memory allocated by GlobalDosAlloc() as follows:
DW>     I allocated the memory, and separated the paragraph from the
DW> descriptor.
DW>     I used WinExec() to start a DOS program which will fill this new
DW> buffer.

[...]

DW> The data is not in the buffer.  In fact, further investigation shows that
DW> the
DW> 2 buffers do not point to the same part of memory.  Anyone know what I am
DW> doing wrong?  Just so you know, I am shifting the paragraph value 4 bits

In enhanced mode Windows in every DOS window got their own virtual mashines.
Each virtual mashine has a own adress space. GlobalDosAlloc allocates memory in 
the adress space of the "system virtual mashine" wich is shared by all windows 
apps. This memory is not mapped in the adress space of the DOS window.
The only way to pass data and control between windows and DOS-software is using 
the DPMI-services.

You should order the DPMI-specification (Intel Order Number: 240763-001) from 
Intel. DPMI provides support for communication between DOS-TSR's and protected 
mode software like windows. 

Send your order to the following address:
DPMI Committee Secretary
Software Focus Group
Intel Corp. NW1-18
2801 Northwestern Parkway
Santa Clara, CA 95051


+-----------+                         Thomas Hornschuh
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