GPF errors using HP Printer drivers

[androidc]

Does faq184-2265 (How to prevent GPF error using HP printer drivers) apply to foxpro 2.6?

 

[Mike Lewis]

I don't think you can declare a DLL call in that way with 2.6, so in that case you would have to find another approach. (Of course, the issue is only relevant in 2.6 for Windows.).

Mike


Mike Lewis
Edinburgh, Scotland

http://www.ml-consult.demon.co.uk

 

[rgbean]

Androidc,
While it's not that simple, it can be done in FPW. Since FPW can't directly call 32-bit DLL's you'll need to use CALL32. The CALL32.ZIP file is on Rick Strahl's site at

http://www.west-wind.com/wwfp2pd.htm,

and includes the necessary files and some demo code. I've tried the following (which seems to work):

SET PROCEDURE TO CALL32
IF !("FOXTOOLS" $ SET("LIBRARY&quot)
SET LIBRARY TO SYS(2004)+"FOXTOOLS.FLL" ADDITIVE
ENDIF

* Win32 usage
*
* DECLARE _fpreset IN msvcrt20.dll
* =_fpreset()

lhcall32=reg32("_fpreset", "msvcrt20.dll", "&quot
lh_fpreset=RegFP("", "L&quot
ln_fpreset=callfn(lh_fpreset, lhcall32)

Note: Back when I was using this, I found that while CALL32 works for many 32-bit API calls, others can fail and "hang" the program / workstation - use only when necessary and test on all potential OS platforms.

Rick