by Serge Lachapelle (10 Submissions)
Category: Files/File Controls/Input/Output
Compatability: Visual Basic 5.0
Difficulty: Intermediate
Date Added: Wed 3rd February 2021
Rating: 
(14 Votes)
Browse For Folder,
now work in all version of windows 98/ME/2000/XP
VBcodersOption Explicit
Private Type SH_ITEM_ID
cb As Long
abID As Byte
End Type
Private Type ITEMIDLIST
mkid As SH_ITEM_ID
End Type
Private Type BrowseInfo
hWndOwner As Long
pidlRoot As Long
pszDisplayName As String
lpszTitle As String
ulFlags As Long
lpfnCallback As Long
lParam As Long
iImage As Long
End Type
Public Enum ROOTDIR_ID
ROOTDIR_CUSTOM = -1
ROOTDIR_ALL = &H0
ROOTDIR_MY_COMPUTER = &H11
ROOTDIR_DRIVES = &H11
ROOTDIR_ALL_NETWORK = &H12
ROOTDIR_NETWORK_COMPUTERS = &H3D
ROOTDIR_WORKGROUP = &H3D
ROOTDIR_USER = &H28
ROOTDIR_USER_DESKTOP = &H10
ROOTDIR_USER_MY_DOCUMENTS = &H5
ROOTDIR_USER_START_MENU = &HB
ROOTDIR_USER_START_MENU_PROGRAMS = &H2
ROOTDIR_USER_START_MENU_PROGRAMS_STARTUP = &H7
ROOTDIR_COMMON_DESKTOP = &H19
ROOTDIR_COMMON_DOCUMENTS = &H2E
ROOTDIR_COMMON_START_MENU = &H16
ROOTDIR_COMMON_START_MENU_PROGRAMS = &H17
ROOTDIR_COMMON_START_MENU_PROGRAMS_STARTUP = &H18
ROOTDIR_WINDOWS = &H24
ROOTDIR_SYSTEM = &H25
ROOTDIR_FONTS = &H14
ROOTDIR_PROGRAM_FILES = &H26
ROOTDIR_PROGRAM_FILES_COMMON_FILES = &H2B
End Enum
Private Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128 ' Maintenance string for PSS usage
End Type
Private Const MAX_PATH = 260
Private 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 Const BFFM_SETOKTEXT = (WM_USER + 105)
Private Const BFFM_ENABLEOK = (WM_USER + 101)
Private Const BIF_DEFAULT = &H0
Private Const BIF_RETURNONLYFSDIRS = &H1 ' only local Directory
Private Const BIF_DONTGOBELOWDOMAIN = &H2
Private Const BIF_STATUSTEXT = &H4 ' not with BIF_NEWDIALOGSTYLE
Private Const BIF_RETURNFSANCESTORS = &H8
Private Const BIF_EDITBOX = &H10
Private Const BIF_VALIDATE = &H20 ' use with BIF_EDITBOX or BIF_USENEWUI
Private Const BIF_NEWDIALOGSTYLE = &H40 ' Use OleInitialize before
Private Const BIF_USENEWUI = &H50 ' = (BIF_NEWDIALOGSTYLE + BIF_EDITBOX)
Private Const BIF_BROWSEINCLUDEURLS = &H80
Private Const BIF_UAHINT = &H100 ' use with BIF_NEWDIALOGSTYLE, add Usage Hint if no EditBox
Private Const BIF_NONEWFOLDERBUTTON = &H200
Private Const BIF_NOTRANSLATETARGETS = &H400
Private Const BIF_BROWSEFORCOMPUTER = &H1000
Private Const BIF_BROWSEFORPRINTER = &H2000
Private Const BIF_BROWSEINCLUDEFILES = &H4000
Private Const BIF_SHAREABLE = &H8000 ' use with BIF_NEWDIALOGSTYLE
' IShellFolder's ParseDisplayName member function should be used instead.
Private Declare Function SHSimpleIDListFromPath Lib "shell32.dll" Alias "#162" (ByVal szPath As String) As Long
'Private Declare Function SHILCreateFromPath Lib "shell32.dll" (ByVal pszPath As Long, ByRef ppidl As Long, ByRef rgflnOut As Long) As Long
Private Declare Function SHGetPathFromIDList Lib "shell32.dll" (ByVal pidList As Long, ByVal lpBuffer As String) As Long
Private Declare Function SHBrowseForFolder Lib "shell32.dll" (lpbi As BrowseInfo) As Long
Private Declare Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)
Private Declare Function SHGetSpecialFolderLocation Lib "shell32.dll" (ByVal hWndOwner As Long, ByVal nFolder As Long, pidl As ITEMIDLIST) As Long
Private Declare Sub OleInitialize Lib "ole32.dll" (pvReserved As Any)
Private Declare Function PathIsDirectory Lib "shlwapi.dll" Alias "PathIsDirectoryA" (ByVal pszPath As String) As Long
Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal HWND As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As String) As Long
Private Declare Function SendMessage2 Lib "user32.dll" Alias "SendMessageA" (ByVal HWND As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function GetVersionEx Lib "kernel32.dll" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As Long
Private m_CurrentDirectory As String
Private OK_BUTTON_TEXT As String
'
Private Function isNT2000XP() As Boolean
Dim lpv As OSVERSIONINFO
lpv.dwOSVersionInfoSize = Len(lpv)
GetVersionEx lpv
If lpv.dwPlatformId = 2 Then
isNT2000XP = True
Else
isNT2000XP = False
End If
End Function
Private Function isME2KXP() As Boolean
Dim lpv As OSVERSIONINFO
lpv.dwOSVersionInfoSize = Len(lpv)
GetVersionEx lpv
If ((lpv.dwPlatformId = 2) And (lpv.dwMajorVersion >= 5)) Or _
((lpv.dwPlatformId = 1) And (lpv.dwMajorVersion >= 4) And (lpv.dwMinorVersion >= 90)) Then
isME2KXP = True
Else
isME2KXP = False
End If
End Function
Private Function GetPIDLFromPath(spath As String) As Long
' Return the pidl to the path supplied by calling the undocumented API #162
If isNT2000XP Then
GetPIDLFromPath = SHSimpleIDListFromPath(StrConv(spath, vbUnicode))
Else
GetPIDLFromPath = SHSimpleIDListFromPath(spath)
End If
End Function
Private Function GetSpecialFolderID(ByVal CSIDL As ROOTDIR_ID) As Long
Dim IDL As ITEMIDLIST, r As Long
r = SHGetSpecialFolderLocation(ByVal 0&, CSIDL, IDL)
If r = 0 Then
GetSpecialFolderID = IDL.mkid.cb
Else
GetSpecialFolderID = 0
End If
End Function
Private Function GetAddressOfFunction(zAdd As Long) As Long
GetAddressOfFunction = zAdd
End Function
Private Function BrowseCallbackProc(ByVal HWND As Long, ByVal uMsg As Long, ByVal lp As Long, ByVal pData As Long) As Long
On Local Error Resume Next
Dim sBuffer As String
Select Case uMsg
Case BFFM_INITIALIZED
SendMessage HWND, BFFM_SETSELECTION, 1, m_CurrentDirectory
If OK_BUTTON_TEXT <> vbNullString Then SendMessage2 HWND, BFFM_SETOKTEXT, 1, StrPtr(OK_BUTTON_TEXT)
Case BFFM_SELCHANGED
sBuffer = Space$(MAX_PATH)
SHGetPathFromIDList lp, sBuffer
sBuffer = Left$(sBuffer, InStr(sBuffer, vbNullChar) - 1)
If Len(sBuffer) = 0 Then
SendMessage2 HWND, BFFM_ENABLEOK, 1, 0
SendMessage HWND, BFFM_SETSTATUSTEXT, 1, ""
Else
SendMessage HWND, BFFM_SETSTATUSTEXT, 1, sBuffer
End If
End Select
BrowseCallbackProc = 0
End Function
Public Function BrowseForFolder(Optional OwnerForm As Form = Nothing, Optional ByVal Title As String = "", Optional ByVal RootDir As ROOTDIR_ID = ROOTDIR_ALL, Optional ByVal CustomRootDir As String = "", Optional ByVal StartDir As String = "", Optional ByVal NewStyle As Boolean = True, Optional ByVal IncludeFiles As Boolean = False, Optional ByVal OkButtonText As String = "") As String
Dim lpIDList As Long, sBuffer As String, tBrowseInfo As BrowseInfo, clRoot As Boolean
If Len(OkButtonText) > 0 Then
OK_BUTTON_TEXT = OkButtonText
Else
OK_BUTTON_TEXT = vbNullString
End If
clRoot = False
If RootDir = ROOTDIR_CUSTOM Then
If Len(CustomRootDir) > 0 Then
If (PathIsDirectory(CustomRootDir) And (Left$(CustomRootDir, 2) <> "\\")) Or (Left$(CustomRootDir, 2) = "\\") Then
tBrowseInfo.pidlRoot = GetPIDLFromPath(CustomRootDir)
' SHILCreateFromPath StrPtr(CustomRootDir), tBrowseInfo.pidlRoot, ByVal 0&
clRoot = True
Else
tBrowseInfo.pidlRoot = GetSpecialFolderID(ROOTDIR_MY_COMPUTER)
End If
Else
tBrowseInfo.pidlRoot = GetSpecialFolderID(ROOTDIR_ALL)
End If
Else
tBrowseInfo.pidlRoot = GetSpecialFolderID(RootDir)
End If
If (Len(StartDir) > 0) Then
m_CurrentDirectory = StartDir & vbNullChar
Else
m_CurrentDirectory = vbNullChar
End If
If Len(Title) > 0 Then
tBrowseInfo.lpszTitle = Title
Else
tBrowseInfo.lpszTitle = "Select A Directory"
End If
tBrowseInfo.lpfnCallback = GetAddressOfFunction(AddressOf BrowseCallbackProc)
tBrowseInfo.ulFlags = BIF_RETURNONLYFSDIRS
If IncludeFiles Then tBrowseInfo.ulFlags = tBrowseInfo.ulFlags + BIF_BROWSEINCLUDEFILES
If NewStyle And isME2KXP Then
tBrowseInfo.ulFlags = tBrowseInfo.ulFlags + BIF_NEWDIALOGSTYLE + BIF_UAHINT
OleInitialize Null ' Initialize OLE and COM
Else
tBrowseInfo.ulFlags = tBrowseInfo.ulFlags + BIF_STATUSTEXT
End If
If Not (OwnerForm Is Nothing) Then tBrowseInfo.hWndOwner = OwnerForm.HWND
lpIDList = SHBrowseForFolder(tBrowseInfo)
If clRoot = True Then CoTaskMemFree tBrowseInfo.pidlRoot
If (lpIDList) Then
sBuffer = Space$(MAX_PATH)
SHGetPathFromIDList lpIDList, sBuffer
CoTaskMemFree lpIDList
sBuffer = Left$(sBuffer, InStr(sBuffer, vbNullChar) - 1)
BrowseForFolder = sBuffer
Else
BrowseForFolder = ""
End If
End Function
Private Sub main()
MsgBox BrowseForFolder(, "TITLE", , , , , , "NewOK")
MsgBox BrowseForFolder(, , ROOTDIR_CUSTOM, "c:\", "c:\windows", False, True)
End Sub
