Declare Function GetLogicalDrives Lib "kernel32.dll" () As Long
Platforms: Win 32s, Win 95/98, Win NT
GetLogicalDrives determines all the valid logical drives on the computer. Logical drives are any drives assigned a one-letter name (such as A: or C:). The return value is a collection of single-bit flags identifying the drives found. Perform a binary And between the return value and increasing powers of 2 to determine all of the drives. For example, And it with 1 to see if drive A: exists, with 2 for B:, 4 for C:, 8 for D:, etc. (See the example for a demonstration.)
Example:
' Tell the user which drives exist on the computer. Note how this example
' only checks up to drive D:, but it does establish the necessary pattern to use in general.
Dim driveflags As Long ' receives the flags identifying valid drives
' Get the valid logical drives on the computer.
driveflags = GetLogicalDrives()
' Test the returned value to see if drives A: through D: exist.
If (driveflags And 1) = 1 Then Debug.Print "Drive A: exists."
If (driveflags And 2) = 2 Then Debug.Print "Drive B: exists."
If (driveflags And 4) = 4 Then Debug.Print "Drive C: exists."
If (driveflags And 8) = 8 Then Debug.Print "Drive D: exists."
' And so on....See Also: GetLogicalDriveStrings
Category: Files
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