64位VBA 7.1中的“浏览文件夹”系统对话框

'##########################################################################################
'#                                                                                        #
'#                                modFolderBrowse                                         #
'#                               code compiled by                                         #
'#                                Steven Elliott                                          #
'#                          from many sources on the net                                  #
'#                           Released to Public Domain                                    #
'#                                                                                        #
'##########################################################################################
Option Explicit
        
Private Declare PtrSafe Function SHBrowseForFolder Lib "shell32.dll" _
  Alias "SHBrowseForFolderA" (lpBrowseInfo As BrowseInfo) As Long
  
Private Declare PtrSafe Function SHGetPathFromIDList Lib "shell32.dll" _
        (ByVal pidList As Long, ByVal lpBuffer As String) As Long
  
Public Declare PtrSafe Function SendMessageA Lib "user32" _
      (ByVal hWnd As LongPtr, ByVal wMsg As Long, _
       ByVal wParam As LongPtr, lParam As Any) As LongPtr
  
Private Declare PtrSafe Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)
Private Const BIF_RETURNONLYFSDIRS  As Long = 1
Private Const CSIDL_DRIVES          As Long = &H11
Private Const WM_USER               As Long = &H400
Private Const MAX_PATH              As Long = 260 ' Is it a bad thing that I memorized this value?
'// message from browser
Private Const BFFM_INITIALIZED     As Long = 1
Private Const BFFM_SELCHANGED      As Long = 2
Private Const BFFM_VALIDATEFAILEDA As Long = 3 '// lParam:szPath ret:1(cont),0(EndDialog)
Private Const BFFM_VALIDATEFAILEDW As Long = 4 '// lParam:wzPath ret:1(cont),0(EndDialog)
Private Const BFFM_IUNKNOWN        As Long = 5 '// provides IUnknown to client. lParam: IUnknown*
'// messages to browser
Private Const BFFM_SETSTATUSTEXTA   As Long = WM_USER + 100
Private Const BFFM_ENABLEOK         As Long = WM_USER + 101
Private Const BFFM_SETSELECTIONA    As Long = WM_USER + 102
Private Const BFFM_SETSELECTIONW    As Long = WM_USER + 103
Private Const BFFM_SETSTATUSTEXTW   As Long = WM_USER + 104
Private Const BFFM_SETOKTEXT        As Long = WM_USER + 105 '// Unicode only
Private Const BFFM_SETEXPANDED      As Long = WM_USER + 106 '// Unicode only
        
Public Type BrowseInfo
  hWndOwner As LongPtr
  pIDLRoot As Long
  pszDisplayName As String
  lpszTitle As String
  ulFlags As Long
  lpfnCallback As LongPtr
  lParam As LongPtr
  iImage As Long
End Type
Private Function PtrToFunction(ByVal lFcnPtr As LongPtr) As LongPtr
  PtrToFunction = lFcnPtr
End Function
Private Function CorrectPath(ByVal sPath As String) As String
  If Right$(sPath, 1) = "" Then
    If Len(sPath) > 3 Then sPath = Left$(sPath, Len(sPath) - 1) ' Strip backslash from non-root
  Else
    If Len(sPath) = 2 Then sPath = sPath & ""                  ' Append backslash to root
  End If
  CorrectPath = sPath
End Function
Public Function FolderBrowse(ByVal sDialogTitle As String, ByVal sPath As String) As String
  Dim ReturnPath As String
  
  Dim b(MAX_PATH) As Byte
  Dim pItem       As Long
  Dim sFullPath   As String
  Dim bi          As BrowseInfo
  Dim ppidl       As Long
  
  sPath = CorrectPath(sPath)
  
  bi.hWndOwner = 0 'Screen.ActiveForm.hwnd
  'SHGetSpecialFolderLocation bi.hWndOwner, CSIDL_DRIVES, ppidl
  bi.pIDLRoot = 0 'ppidl
  bi.pszDisplayName = VarPtr(b(0))
  bi.lpszTitle = sDialogTitle
  bi.ulFlags = BIF_RETURNONLYFSDIRS
  If FolderExists(sPath) Then bi.lpfnCallback = PtrToFunction(AddressOf BFFCallback)
  bi.lParam = StrPtr(sPath)
  pItem = SHBrowseForFolder(bi)
  
  If pItem Then ' Succeeded
    sFullPath = Space$(MAX_PATH)
    If SHGetPathFromIDList(pItem, sFullPath) Then
      ReturnPath = Left$(sFullPath, InStr(sFullPath, vbNullChar) - 1) ' Strip nulls
      CoTaskMemFree pItem
    End If
  End If
  
  If Right$(ReturnPath, 1)  "" And ReturnPath  "" Then  'Could be "C:"
    FolderBrowse = ReturnPath & ""
  End If
  
End Function
Public Function BFFCallback(ByVal hWnd As Long, ByVal uMsg As Long, ByVal lParam As Long, ByVal sData As String) As Long
  If uMsg = BFFM_INITIALIZED Then
    SendMessageA hWnd, BFFM_SETSELECTIONA, True, ByVal sData
  End If
End Function
Public Function FolderExists(ByVal sFolderName As String) As Boolean
   Dim att As Long
   On Error Resume Next
   att = GetAttr(sFolderName)
   If Err.Number = 0 Then
      FolderExists = True
   Else
      Err.Clear
      FolderExists = False
   End If
   On Error GoTo 0
End Function

Private Sub cmdGetLibraryPath_Click()
   Dim sPath As String
'                          FolderBrowse(DialogBoxTitle, StartingPath)
   sPath = modFolderBrowse.FolderBrowse("Select Folder Containing Block Library", txtLibraryPath.Text)
   If sPath  "" Then
      If modFolderBrowse.FolderExists(sPath) Then
         txtLibraryPath.Text = sPath
      End If
   End If
End Sub