module1.bas

虚拟驱动器

Attribute VB_Name = "Module1"
Public Type BrowseInfo
    lngHwnd        As Long
    pIDLRoot       As Long
    pszDisplayName As Long
    lpszTitle      As Long
    ulFlags        As Long
    lpfnCallback   As Long
    lParam         As Long
    iImage         As Long
End Type

Public Const BIF_RETURNONLYFSDIRS = 1
Public Const MAX_PATH = 260

Declare Sub CoTaskMemFree Lib "ole32.dll" _
    (ByVal hMem As Long)

Declare Function lstrcat Lib "kernel32" _
   Alias "lstrcatA" (ByVal lpString1 As String, _
   ByVal lpString2 As String) As Long
   
Declare Function SHBrowseForFolder Lib "shell32" _
   (lpbi As BrowseInfo) As Long
   
Declare Function SHGetPathFromIDList Lib "shell32" _
   (ByVal pidList As Long, ByVal lpBuffer As String) As Long
   
Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long

Global Drives(1 To 26) As String

Public Function BrowseForFolder(ByVal lngHwnd As Long, ByVal strPrompt As String) As String

    On Error GoTo ehBrowseForFolder 'Trap for errors

    Dim intNull As Integer
    Dim lngIDList As Long, lngResult As Long
    Dim strPath As String
    Dim udtBI As BrowseInfo

    'Set API properties (housed in a UDT)
    With udtBI
        .lngHwnd = lngHwnd
        .lpszTitle = lstrcat(strPrompt, "")
        .ulFlags = BIF_RETURNONLYFSDIRS
    End With

    'Display the browse folder...
    lngIDList = SHBrowseForFolder(udtBI)

    If lngIDList <> 0 Then
        'Create string of nulls so it will fill in with the path
        strPath = String(MAX_PATH, 0)

        'Retrieves the path selected, places in the null
         'character filled string
        lngResult = SHGetPathFromIDList(lngIDList, strPath)

        'Frees memory
        Call CoTaskMemFree(lngIDList)

        'Find the first instance of a null character,
         'so we can get just the path
        intNull = InStr(strPath, vbNullChar)
        'Greater than 0 means the path exists...
        If intNull > 0 Then
            'Set the value
            strPath = Left(strPath, intNull - 1)
        End If
    End If

    'Return the path name
    BrowseForFolder = strPath
    Exit Function 'Abort

ehBrowseForFolder:

    'Return no value
    BrowseForFolder = Empty

End Function

Sub SetDrives()
    Drives(1) = "a:"
    Drives(2) = "b:"
    Drives(3) = "c:"
    Drives(4) = "d:"
    Drives(5) = "e:"
    Drives(6) = "f:"
    Drives(7) = "g:"
    Drives(8) = "h:"
    Drives(9) = "i:"
    Drives(10) = "j:"
    Drives(11) = "k:"
    Drives(12) = "l:"
    Drives(13) = "m:"
    Drives(14) = "n:"
    Drives(15) = "o:"
    Drives(16) = "p:"
    Drives(17) = "q:"
    Drives(18) = "r:"
    Drives(19) = "s:"
    Drives(20) = "t:"
    Drives(21) = "u:"
    Drives(22) = "v:"
    Drives(23) = "w:"
    Drives(24) = "x:"
    Drives(25) = "y:"
    Drives(26) = "z:"
End Sub