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Q137556: HOWTO: Determine Font Size Setting

Article: Q137556
Product(s): Microsoft FoxPro
Version(s): WINDOWS:2.5,2.5a,2.5b,2.6,2.6a
Operating System(s): 
Keyword(s): kbFont kbGrpDSFox
Last Modified: 03-JUL-1999

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The information in this article applies to:

- Microsoft FoxPro for Windows, versions 2.5, 2.5a, 2.5b, 2.6, 2.6a 
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SUMMARY
=======

The code in this article demonstrates how to use the Foxtools.fll library
commands to call Microsoft Windows application programming interface (API)
functions to determine if the current session of Windows is using Small or Large
Fonts. The following API functions are used:

  GetDC()
  GetDeviceCaps()
  ReleaseDC()

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

The program first loads the Foxtools.fll library that is supplied with FoxPro
for Windows. Then it initializes some variables and retrieves the handle for the
display device. Next, it calls the GetDeviceCaps function, requesting the number
of pixels per logical inch along the display width and height. If the number of
pixels is equal to 96, Windows is running with Small Fonts. If the number of
pixels is equal to 120, Windows is running with Large Fonts. The program then
releases the handle to the display device and the library.

  SET LIBRARY TO SYS(2004) + "FOXTOOLS.FLL" ADDITIVE

  * create variables to pass index to GetDeviceCaps()
  * this value cane be found in the WINGDI.H file

  LOGPIXELSX = 88
  LOGPIXELSY = 90

  * get the handle to the device context

  lnGetDC = RegFN("GetDC","I","I")
  lnHDC = CallFN(lnGetDC,0)

  * get the number of pixels per logical inch

  lnGetLogPix = RegFN("GetDeviceCaps","II","I")
  lnLogPixX = CallFN(lnGetLogPix,lnHDC,LOGPIXELSX)
  lnLogPixY = CallFN(lnGetLogPix,lnHDC,LOGPIXELSY)

  * determine if small or large fonts, either lnLogPixX or
  * lnLogPixY may be used to test for the values 96 or 120

  IF lnLogPixX < 96
    WAIT WINDOW "Windows is using smaller than Small Fonts"   
  ELSE IF InLogPixX = 96
    WAIT WINDOW "Windows is using Small Fonts"   
  ELSE IF InLogPixX < 120
    WAIT WINDOW "Windows is using between Small Fonts and Large Fonts"
  ELSE IF IF lnLogPixX = 120
    WAIT WINDOW "Windows is using Large Fonts"
  ELSE
    WAIT WINDOW "Windows is using larger than Large Fonts"
  ENDIF

  * release the handle to the device context

  lnRelease = RegFN("ReleaseDC","II","I")
  = CallFN(lnRelease,0,lnHDC)

  * release the FOXTOOLS.FLL library

  RELEASE LIBRARY SYS(2004) + "FOXTOOLS.FLL"

REFERENCES
==========

Microsoft Windows Software Development Kit, "Programmer's Reference, Volume 2:
Functions," pages 350-354, 785.

Foxtools.wri located in the C:\Fpw26\Goodies\Foxtools directory.

Wingdi.h located in the C:\C700\Include directory

Additional query words: 2.50 2.60 FoxWin

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Keywords          : kbFont kbGrpDSFox 
Technology        : kbAudDeveloper kbFoxproSearch kbFoxPro260 kbFoxPro250 kbFoxPro250a kbFoxPro250b kbFoxPro260a
Version           : WINDOWS:2.5,2.5a,2.5b,2.6,2.6a
Issue type        : kbhowto

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