用SHBrowseForFolder及回调函数:模块:Private Const BIF_STATUSTEXT = &H4& Private Const BIF_RETURNONLYFSDIRS = 1 Private Const BIF_DONTGOBELOWDOMAIN = 2Private Const WM_USER = &H400 Private Const BFFM_INITIALIZED = 1 Private Const BFFM_SELCHANGED = 2 Private Const BFFM_SETSTATUSTEXT = (WM_USER + 100) Private Const BFFM_SETSELECTION = (WM_USER + 102)Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam 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 Private Declare Function lstrcat Lib "kernel32" Alias "lstrcatA" (ByVal lpString1 As String, ByVal lpString2 As String) As LongPrivate Type BrowseInfo hWndOwner As Long pIDLRoot As Long pszDisplayName As Long lpszTitle As Long ulFlags As Long lpfnCallback As Long lParam As Long iImage As Long End TypePrivate m_CurrentDirectory As String 'The current directory 'Public Function BrowseForFolder(owner As Form, Title As String, StartDir As String) As String 'Opens a Treeview control that displays the directories in a computer Dim lpIDList As Long Dim szTitle As String Dim sBuffer As String Dim tBrowseInfo As BrowseInfo m_CurrentDirectory = StartDir & vbNullChar szTitle = Title With tBrowseInfo .hWndOwner = owner.hWnd .lpszTitle = lstrcat(szTitle, "") .ulFlags = BIF_RETURNONLYFSDIRS + BIF_DONTGOBELOWDOMAIN + BIF_STATUSTEXT .lpfnCallback = GetAddressofFunction(AddressOf BrowseCallbackProc) 'get address of function. End With lpIDList = SHBrowseForFolder(tBrowseInfo) If (lpIDList) Then sBuffer = Space(MAX_PATH) SHGetPathFromIDList lpIDList, sBuffer sBuffer = Left(sBuffer, InStr(sBuffer, vbNullChar) - 1) BrowseForFolder = sBuffer Else BrowseForFolder = "" End If
End Function
Private Function BrowseCallbackProc(ByVal hWnd As Long, ByVal uMsg As Long, ByVal lp As Long, ByVal pData As Long) As Long
Dim lpIDList As Long Dim ret As Long Dim sBuffer As String
On Error Resume Next 'Sugested by MS to prevent an error from 'propagating back into the calling process.
Select Case uMsg
Case BFFM_INITIALIZED Call SendMessage(hWnd, BFFM_SETSELECTION, 1, m_CurrentDirectory)
Case BFFM_SELCHANGED sBuffer = Space(MAX_PATH)
ret = SHGetPathFromIDList(lp, sBuffer) If ret = 1 Then Call SendMessage(hWnd, BFFM_SETSTATUSTEXT, 0, sBuffer) End If
End Select
BrowseCallbackProc = 0
End FunctionPrivate Function GetAddressofFunction(add As Long) As Long GetAddressofFunction = add End Function窗体中:Private Sub Command1_Click() getdir = BrowseForFolder(Me, "选择路径", _默认的路径) End Sub
Private Const BIF_RETURNONLYFSDIRS = 1
Private Const BIF_DONTGOBELOWDOMAIN = 2Private Const WM_USER = &H400
Private Const BFFM_INITIALIZED = 1
Private Const BFFM_SELCHANGED = 2
Private Const BFFM_SETSTATUSTEXT = (WM_USER + 100)
Private Const BFFM_SETSELECTION = (WM_USER + 102)Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam 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
Private Declare Function lstrcat Lib "kernel32" Alias "lstrcatA" (ByVal lpString1 As String, ByVal lpString2 As String) As LongPrivate Type BrowseInfo
hWndOwner As Long
pIDLRoot As Long
pszDisplayName As Long
lpszTitle As Long
ulFlags As Long
lpfnCallback As Long
lParam As Long
iImage As Long
End TypePrivate m_CurrentDirectory As String 'The current directory
'Public Function BrowseForFolder(owner As Form, Title As String, StartDir As String) As String
'Opens a Treeview control that displays the directories in a computer Dim lpIDList As Long
Dim szTitle As String
Dim sBuffer As String
Dim tBrowseInfo As BrowseInfo
m_CurrentDirectory = StartDir & vbNullChar szTitle = Title
With tBrowseInfo
.hWndOwner = owner.hWnd
.lpszTitle = lstrcat(szTitle, "")
.ulFlags = BIF_RETURNONLYFSDIRS + BIF_DONTGOBELOWDOMAIN + BIF_STATUSTEXT
.lpfnCallback = GetAddressofFunction(AddressOf BrowseCallbackProc) 'get address of function.
End With lpIDList = SHBrowseForFolder(tBrowseInfo)
If (lpIDList) Then
sBuffer = Space(MAX_PATH)
SHGetPathFromIDList lpIDList, sBuffer
sBuffer = Left(sBuffer, InStr(sBuffer, vbNullChar) - 1)
BrowseForFolder = sBuffer
Else
BrowseForFolder = ""
End If
End Function
Private Function BrowseCallbackProc(ByVal hWnd As Long, ByVal uMsg As Long, ByVal lp As Long, ByVal pData As Long) As Long
Dim lpIDList As Long
Dim ret As Long
Dim sBuffer As String
On Error Resume Next 'Sugested by MS to prevent an error from
'propagating back into the calling process.
Select Case uMsg
Case BFFM_INITIALIZED
Call SendMessage(hWnd, BFFM_SETSELECTION, 1, m_CurrentDirectory)
Case BFFM_SELCHANGED
sBuffer = Space(MAX_PATH)
ret = SHGetPathFromIDList(lp, sBuffer)
If ret = 1 Then
Call SendMessage(hWnd, BFFM_SETSTATUSTEXT, 0, sBuffer)
End If
End Select
BrowseCallbackProc = 0
End FunctionPrivate Function GetAddressofFunction(add As Long) As Long
GetAddressofFunction = add
End Function窗体中:Private Sub Command1_Click()
getdir = BrowseForFolder(Me, "选择路径", _默认的路径)
End Sub