DOCUMENT:Q215362  04-FEB-1999  [foxpro]
TITLE   :HOWTO: Detect DCOM Installation Under VFP 6.0
PRODUCT :Microsoft FoxPro
PROD/VER:WINDOWS:6.0
OPER/SYS:
KEYWORDS:kbDCOM kbOSWinNT400 kbvfp600 kbOSWin95 kbOSWin98 kbFFC

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The information in this article applies to:

 - Microsoft Visual FoxPro for Windows, version 6.0 
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SUMMARY
=======

This article illustrates how to detect whether DCOM is installed in a Windows
95/98 or a Windows NT 4.0 machine from within Visual FoxPro 6.0.

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

An application created with a Top-Level form needs DCOM installed in order to
work properly when the Visual FoxPro main desktop is suppressed in the
Config.fpw with SCREEN=OFF.

With the code below, you can detect that DCOM is present. Based on this
information, you can shut down the application if necessary.

   #DEFINE HKEY_LOCAL_MACHINE  -2147483646
   #DEFINE DCOMKEYSTRING 'SOFTWARE\Microsoft\OLE'
   #DEFINE ENABLEDCOMKEY 'EnableDCOM'

   SET CLASSLIB TO HOME()+"ffc/REGISTRY.VCX"
   oReg=CREATEOBJECT('registry')
   LOCAL lFoundDCOM
   lFoundDCOM = .F.
   IF oReg.OpenKey(DCOMKEYSTRING,HKEY_LOCAL_MACHINE,.F.) = 0
      LOCAL cValue
      cValue = ''
      IF oReg.GetKeyValue(ENABLEDCOMKEY,@cValue) = 0
         lFoundDCOM = !EMPTY(cValue)
      ENDIF
   ENDIF
   IF !lFoundDCOM
      MESSAGEBOX('DCOM not install on system')
   ELSE
      MESSAGEBOX('DCOM install on system')
   ENDIF

REFERENCES
==========

For additional information about exception errors terminating Top-Level form in
Visual FoxPro applications, please see the following article in the Microsoft
Knowledge Base:

Q193472 BUG: Exception Error Exiting Top-Level Form App in Windows 95

Additional query words: DCOM

======================================================================
Keywords          : kbDCOM kbOSWinNT400 kbvfp600 kbOSWin95 kbOSWin98 kbFFC 
Technology        : kbVFPsearch kbAudDeveloper kbVFP600
Version           : WINDOWS:6.0
Issue type        : kbhowto

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