目录选择对话框

王朝vb·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

Option Explicit

Private 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

Private Const BIF_RETURNONLYFSDIRS = 1

Private Const MAX_PATH = 260

Private Declare Sub CoTaskMemFree Lib "ole32.dll" _

(ByVal hMem As Long)

Private Declare Function lstrcat Lib "Kernel32" _

Alias "lstrcatA" (ByVal lpString1 As String, _

ByVal lpString2 As String) As Long

Private Declare Function SHBrowseForFolder Lib "shell32" _

(lpbi As BrowseInfo) As Long

Private Declare Function SHGetPathFromIDList Lib "shell32" _

(ByVal pidList As Long, ByVal lpBuffer As String) As Long

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

 
 
 
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