Q152396: How To Determine if QuickDraw GX Is Loaded Using SYS Function

Article: Q152396
Product(s): Microsoft FoxPro
Version(s): MACINTOSH:3.0b
Operating System(s): 
Keyword(s): 
Last Modified: 15-DEC-1999

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The information in this article applies to:

- Microsoft Visual FoxPro for Macintosh, version 3.0b 
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SUMMARY
=======

This article describes how to determine whether QuickDraw GX is loaded in the
Macintosh's operating system by using the new SYS function SYS(1038) in Visual
FoxPro for Macintosh. Two other methods to make this determination are also
described in the More Information section of this article.

The syntax for the SYS(1038) function is:

  ? SYS(1038) && To output the result to the current output device

  or

  x=SYS(1038) && To store the result to a variable named "x"

If QuickDraw GX is loaded, the SYS(1038) function returns TRUE (.T.). If
QuickDraw GX is not loaded, it returns FALSE (.F.).

QuickDraw GX is manufactured by a vendor independent of Microsoft; we make no
warranty, implied or otherwise, regarding the performance or reliability of
QuickDraw GX.

Macintosh Operating System, version 8, no longer supports QuickDraw GX printer
drivers and printing extensions. Therefore, SYS(1038) always returns false (.F.)
when used in Visual FoxPro running under OS 8. This is true even if the
QuickDraw GX 1.1.6 version provided with OS 8 is installed. For additional
information on the changes with QuickDraw GX in OS 8 see the About QuickDraw GX
readme file in the Mac OS 8 Read Me folder on the CD-ROM.

MORE INFORMATION
================

There are at least two other methods you can use to determine if QuickDraw GX is
loaded, although neither is as easy as SYS(1038) Two other methods are:

- Use the FILE() function, along with the SYS(2033) function, that will return
  the name of the System:Extensions folder to check for the existence of the
  QuickDraw GX Extension:

     ? FILE(SYS(2033,1)+":Quickdraw"+CHR(170)+" GX")

  Note the space between the quote mark and GX" at the end. CHR(170) is the
  trademark symbol (TM).

- Use the FxGestalt() function in FoxTools.cfm. This method requires the
  FoxTools.cfm library to be loaded first:

     x=""
     SET LIBRARY TO HOME()+"Foxtools.cfm"
     ? FxGestalt("qdgx",@x)

  If QuickDraw GX is installed, a positive integer is returned; otherwise,
  FXGestalt() returns a negative integer. NOTE: The values returned to the
  second argument of FxGestalt() were not documented at the time this article
  was written. For more information on the FxGestalt() function, see the
  Foxtools.hlp file in the "Microsoft Visual FoxPro:Tools" folder.

Additional query words: VFoxMac

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Keywords          :  
Technology        : kbHWMAC kbOSMAC kbVFPsearch kbAudDeveloper kbVFP300bMac
Version           : MACINTOSH:3.0b

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