Article ID: 180766
Article Last Modified on 1/22/2007
APPLIES TO
- Microsoft Visual Basic for Applications 5.0
- Microsoft Office 97 Standard Edition
- Microsoft Access 97 Standard Edition
- Microsoft Excel 97 Standard Edition
- Microsoft PowerPoint 97 Standard Edition
- Microsoft Word 97 Standard Edition
This article was previously published under Q180766
SUMMARY
This article contains sample Microsoft Visual Basic for Applications code that determines the drive letter of the first CD-ROM drive and returns it to a variable as a string. It is then output to a message box. This would be useful for accessing files contained on a CD.
MORE INFORMATION
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Sample Visual Basic Procedure
' **********************************************************************
'
' FUNCTION:
' GetFirstCdRomDriveLetter()
'
' PURPOSE:
' Finds the first CD-ROM device and then returns its drive letter.
'
' ARGUMENTS:
' None
'
' RETURNS:
' A string that represents the first CD-ROM drive letter. If the
' function fails for any reason, it returns vbNullString.
'
' **********************************************************************
Declare Function GetDriveType Lib "kernel32" Alias _
"GetDriveTypeA" (ByVal nDrive As String) As Long
Declare Function GetLogicalDriveStrings Lib "kernel32" Alias _
"GetLogicalDriveStringsA" (ByVal nBufferLength As Long, _
ByVal lpBuffer As String) As Long
Public Const DRIVE_CDROM As Long = 5
Function GetFirstCdRomDriveLetter() As String
' Declare variables.
Dim lDriveType As Long
Dim strDrive As String
Dim lStart As Long: lStart = 1
' Create a string to hold the logical drives.
Dim strDrives As String
strDrives = Space(150)
' Get the logial drives on the system.
' If the function fails it returns zero.
Dim lRetVal As Long
lRetVal = GetLogicalDriveStrings(150, strDrives)
' Check to see if GetLogicalDriveStrings() worked.
If lRetVal = 0 Then
' Get GetLogicalDriveStrings() failed.
GetFirstCdRomDriveLetter = vbNullString
Exit Function
End If
' Get the string that represents the first drive.
strDrive = Mid(strDrives, lStart, 3)
Do
' Test the first drive.
lDriveType = GetDriveType(strDrive)
' Check if the drive type is a CD-ROM.
If lDriveType = DRIVE_CDROM Then
' Found the first CD-ROM drive on the system.
GetFirstCdRomDriveLetter = strDrive
Exit Function
End If
' Increment lStart to next drive in the string.
lStart = lStart + 4
' Get the string that represents the first drive.
strDrive = Mid(strDrives, lStart, 3)
Loop While (Mid(strDrives, lStart, 1) <> vbNullChar)
End Function
Following is an example of calling the GetFirstCdRomDriveLetter() function from a macro (Sub procedure):
Sub Main
Dim strDriveLetter as String
' Call the GetFirstCdRomDriveLetter() and store the
' return value in strDriveLetter.
strDriveLetter = GetFirstCdRomDriveLetter()
' Display the drive letter in a message box.
MsgBox strDriveLetter
End Sub
REFERENCES
For more information about getting help with Visual Basic for Applications, please see the following article in the Microsoft Knowledge Base:
163435 VBA: Programming Resources for Visual Basic for Applications
Additional query words: 8.00 ppt8 vbe drives letters win32 api device enum enumurate cds
Keywords: kbhowto KB180766
