by MOHAMED A HAFEZ (1 Submission)
Category: Windows API Call/Explanation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Tue 22nd April 2003
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
HOW CAN I KNOW THE CDROM DRIVE LETTER IN ANY COMPUTER
API Declarations
Const DRIVE_FIXED = 3
Const DRIVE_REMOTE = 4
Const DRIVE_CDROM = 5
Const DRIVE_RAMDISK = 6
VBcoders
Public Declare Function GetLogicalDriveStrings Lib "kernel32" Alias "GetLogicalDriveStringsA" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long
Public Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long
----------------------------------------------
Private Sub Command1_Click()
Dim r&, allDrives$, JustOneDrive$, pos%, DriveType&
Dim CDfound As Integer
'pad the string with spaces
allDrives$ = Space$(64)
'call the API to get the string containing all drives
r& = GetLogicalDriveStrings(Len(allDrives$), allDrives$)
'trim off trailing chr$(0)'s. AllDrives$
'now contains all the drive letters.
allDrives$ = Left$(allDrives$, r&)
'begin a loop
Do
'find the first separating chr$(0)
pos% = InStr(allDrives$, Chr$(0))
'if there's one, then...
If pos% Then
'extract the drive up to the chr$(0)
JustOneDrive$ = Left$(allDrives$, pos%)
'and remove that from the Alldrives string,
'so it won't be checked again
allDrives$ = Mid$(allDrives$, pos% + 1, Len(allDrives$))
'with the one drive, call the API to
'determine the drive type
DriveType& = GetDriveType(JustOneDrive$)
'check if it's what we want
If DriveType& = DRIVE_CDROM Then
'got it (or at least the first one,
'anyway, if more than one), so set
'the found flag...
CDfound% = True
'we're done, so get out
Exit Do
End If
End If
Loop Until allDrives$ = "" Or DriveType& = 6
'display the appropriate message
If CDfound% Then
Label1 = UCase$(JustOneDrive$)
Else: Label1 = "NO CDROM DRIVE..!!"
End If
End Sub
