vb打开文件夹对话框，并可事先指定默认路径，打开指定目录的对话框

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可以用SHBrowseForFolder来实现

'Objects: Form1、Command1、Module1
'Form1:
Option Explicit
Private Const BIF_RETURNONLYFSDIRS = 1
Private Const BIF_DONTGOBELOWDOMAIN = 2
Private Const MAX_PATH = 260
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 Long
Private Declare Function LocalAlloc Lib "kernel32" (ByVal uFlags As Long, ByVal uBytes As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDest As Any, pSource As Any, ByVal dwLength As Long)
Private Const LPTR = (&H0 Or &H40)
Private 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 Type
Private Function MyAddressOf(AddressOfX As Long) As Long
MyAddressOf = AddressOfX
End Function

Private Sub Command1_Click()
Dim lpIDList As Long
Dim sBuffer As String
Dim szTitle As String
Dim tBrowseInfo As BrowseInfo
Dim Ret As Long
szTitle = "This is the title"
Dim sPath As String
sPath = VBA.InputBox("初始路径:", , "C:/program files")
With tBrowseInfo
.hWndOwner = Me.hWnd
.lpszTitle = lstrcat(szTitle, "")
.ulFlags = BIF_RETURNONLYFSDIRS + BIF_DONTGOBELOWDOMAIN
.lpfnCallback = MyAddressOf(AddressOf BrowseForFolders_CallbackProc)
Ret = LocalAlloc(LPTR, VBA.Len(sPath) + 1)
CopyMemory ByVal Ret, ByVal sPath, VBA.Len(sPath) + 1
.lParam = Ret
End With
lpIDList = SHBrowseForFolder(tBrowseInfo)
If (lpIDList) Then
sBuffer = VBA.Space(MAX_PATH)
SHGetPathFromIDList lpIDList, sBuffer
sBuffer = VBA.Left(sBuffer, VBA.InStr(sBuffer, vbNullChar) - 1)
MsgBox sBuffer
End If
End Sub

'Module1:
Option Explicit
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Const WM_USER = &H400
Private Const BFFM_SETSELECTIONA As Long = (WM_USER + 102)
Private Const BFFM_SETSELECTIONW As Long = (WM_USER + 103)
Private Const BFFM_INITIALIZED As Long = 1
Public Function BrowseForFolders_CallbackProc(ByVal hWnd As Long, ByVal uMsg As Long, ByVal lParam As Long, ByVal lpData As Long) As Long
If uMsg = BFFM_INITIALIZED Then
SendMessage hWnd, BFFM_SETSELECTIONA, True, ByVal lpData
End If
End Function