Enumerating CD Devices on Your System

This short code sample shows how to determine all the CDRom drives you have connected to your computer using the WinAPI.

Although this can now be done with the new FileSystemObject that comes with VB6 (and as an extra with VB5), this is how to get the drives through code when the target machine may not have the SSCRUN.DLL.

The code is quite simple and uses the GetDriveType and GetLogicalDriveStrings Windows API calls.

'
private Declare Function GetDriveType Lib "kernel32" _
        Alias "GetDriveTypeA" (byval nDrive as string) as Long
private Declare Function GetLogicalDriveStrings Lib "kernel32" _
        Alias "GetLogicalDriveStringsA" (byval nBufferLength as Long, _
        byval lpBuffer as string) as Long
private Const DRIVE_CDROM = 5
'
private Sub ListCDROMs()
    Dim sDrives as string
    Dim sDrive as string

    sDrives = Space(255)
    sDrives = Left$(sDrives, GetLogicalDriveStrings(255, byval sDrives))
    While InStr(sDrives, "\")
        sDrive = Left$(sDrives, InStr(sDrives, "\"))
        If GetDriveType(sDrive) = DRIVE_CDROM then
            List1.AddItem "(CDRom) " & sDrive
        End If
        sDrives = mid$(sDrives, len(sDrive) + 2)
    Wend
End Sub
'

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