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

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This article was previously published under Q137407

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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