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From: mms00786@uxa.cso.uiuc.edu
Newsgroups: comp.windows.ms
Subject: FAR functions and float types
Message-ID: <246400022@uxa.cso.uiuc.edu>
Date: 11 Sep 89 04:30:00 GMT
Lines: 46
Nf-ID: #N:uxa.cso.uiuc.edu:246400022:000:1809
Nf-From: uxa.cso.uiuc.edu!mms00786    Sep 10 23:30:00 1989


Ok, I have wasted an entire weekend, so I hope wasting a little bandwidth is ok.

I am trying to write a medium model Windows program. I have certain functions
that are in seperate modules (obj files), and I need to call one from the other.
Here's what happens:

a) if I declare something like
   void FAR fnPlotSegment (hWnd, fFromX, fToX)
   HWND hWnd;
   float fFromX;
   float fToX;
   {...}
   then I am unable to pass the float type arguments! Everything compiles, runs,
   etc. but if I try to print the float values passed in, they are always 0.0!
b) if I declare something like
   void FAR PASCAL fnPlotSegment ...
   then windows crashes the first time I call it! As in, no warning, lets go 
   back to the C prompt and destroy the contents of the cmos setup too!
c) but the declaration
   void FAR fnPlotAnalog (hWnd, fFromX, fToX)
   HWND hWnd;
   double fFromX;
   double fToX;
   {....}
   works without a glitch! The only problem is that with this solution, I am
   unable to sleep, because the only way I can explain it is that I am getting
   lucky with the "double" declaration, and its going to crash on Tuesdays with
   a lunar eclipse when the Panda bear at the zoo get pneumonia.

Can someone please explain what I am doing wrong, or why any of the above makes
sense? I am using the medium model, but the small model has the same symptoms. I
am also compiling using the same line options that Petzold uses in his sample
make files. I am using MSC 5.0. I have scanned K&R and parts of the MSC manuals,
but the only difference between float and double should be the precision.

I am also having incredible problems trying to pass user defined types as
arguments to functions - as in just can't do it.

Please help before I flunk out of school.

Thanks,

Milan
mms00786@uxa.cso.uiuc.edu
.