KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q137407: How to Obtain the Active Drive Letters in a Visual FoxPro App

Article: Q137407
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0
Operating System(s): 
Keyword(s): kbcode
Last Modified: 11-FEB-2000

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 3.0 
-------------------------------------------------------------------------------

SUMMARY
=======

Call the GetLogicalDriveStrings API to get all the drive letters used in the
active session of Windows NT or Windows 95. This API is not supported in Win32s,
so it cannot be used when Visual FoxPro is running under Windows 3.x.

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

The following code fragment returns an array called aMyarray containing all the
used drive letters for that session of Windows NT or Windows 95. The code uses
the GetLogicalDriveStrings Windows API, which is supported under Win32 only, not
Win32s. The Number of drives is in a variables called NumberOfDrives.

     DECLARE INTEGER GetLogicalDriveStrings IN Win32API as getit;
         INTEGER nBuffSize, STRING  lpString
     CLEAR
     DIMENSION aMyarray(1)
     lpString=SPACE(200)
     nBuffSize=LEN(lpString)
     =getit(nBuffSize,@lpString)
     NumberOfDrives=OCCURS(":",lpString)
     DIMENSION aMyarray(NumberOfDrives)
     FOR  i=1 TO  NumberOfDrives
        aMyarray(i)=SUBSTR(lpString,AT(":",lpString,i)-1,1)
     ENDFOR

Additional query words: VFoxWin logical drive list

======================================================================
Keywords          : kbcode 
Technology        : kbVFPsearch kbAudDeveloper kbVFP300
Version           : WINDOWS:3.0

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.