by Serge Lachapelle (10 Submissions)
Category: Windows API Call/Explanation
Compatability: Visual Basic 5.0
Difficulty: Intermediate
Date Added: Wed 3rd February 2021
Rating: 
(7 Votes)
Browse For Folder, Make New Folder, Form can be resize, Right Click Menu (Like in Explorer)
VBcodersOption Explicit
Public Const MAX_PATH = 260
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 Type SH_ITEM_ID
cb As Long
abID As Byte
End Type
Private Type ITEMIDLIST
mkid As SH_ITEM_ID
End Type
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 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
Private Declare Function PathIsDirectory Lib "shlwapi.dll" Alias "PathIsDirectoryA" (ByVal pszPath As String) As Long
Private Declare Function SHBrowseForFolder Lib "shell32.dll" (lpbi As BrowseInfo) As Long
Private Declare Function SHGetPathFromIDList Lib "shell32.dll" (ByVal pidList As Long, ByVal lpBuffer As String) As Long
Private Declare Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)
Private Declare Function lstrcat Lib "Kernel32.dll" Alias "lstrcatA" (ByVal lpString1 As String, ByVal lpString2 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 SHParseDisplayName Lib "shell32.dll" (ByVal pszName As Long, ByVal pbc As Long, ByRef ppidl As Long, ByVal sfgaoIn As Long, ByRef psfgaoOut As Long) 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 Sub CopyMemory Lib "Kernel32.dll" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private m_CurrentDirectory As String
'Private NEW_OK_TEXT As String
Private Function GetAddressofFunction(add As Long) As Long
GetAddressofFunction = add
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 lpIDList As Long, ret As Long, sBuffer As String, qwe As String
Select Case uMsg
Case BFFM_INITIALIZED
SendMessage HWND, BFFM_SETSELECTION, 1, m_CurrentDirectory
' If NEW_OK_TEXT <> vbNullString Then SendMessage HWND, BFFM_SETOKTEXT, 1, NEW_OK_TEXT
Case BFFM_SELCHANGED
sBuffer = Space(MAX_PATH)
ret = SHGetPathFromIDList(lp, sBuffer)
If ret = 1 Then
SendMessage HWND, BFFM_SETSTATUSTEXT, 0, sBuffer
End If
End Select
BrowseCallbackProc = 0
End Function
Public Function BrowseForFolder(Optional ByVal Title As String = "", Optional ByVal RootDir As String = "", Optional ByVal StartDir As String = "", Optional owner As Form = Nothing, Optional ByVal NewStyle As Boolean = True, Optional ByVal IncludeFiles As Boolean = False) As String
Dim lpIDList As Long, lpIDList2 As Long, IDL As ITEMIDLIST
Dim sBuffer As String, tBrowseInfo As BrowseInfo, r As Long
' If Len(NewTextForOkButton) > 0 Then
' CopyMemory NEW_OK_TEXT, ByVal VarPtr(NewTextForOkButton), 4
' Else
' NEW_OK_TEXT = vbNullString
' End If
If Len(RootDir) > 0 Then
If PathIsDirectory(RootDir) Then
SHParseDisplayName StrPtr(RootDir), ByVal 0&, lpIDList2, ByVal 0&, ByVal 0&
tBrowseInfo.pIDLRoot = lpIDList2
Else
r = SHGetSpecialFolderLocation(ByVal 0&, &H11, IDL) ' get "My Computer" Folder
If r = 0 Then tBrowseInfo.pIDLRoot = IDL.mkid.cb
End If
Else
r = SHGetSpecialFolderLocation(ByVal 0&, &H11, IDL) ' get "My Computer" Folder
If r = 0 Then tBrowseInfo.pIDLRoot = IDL.mkid.cb
End If
If Len(StartDir) > 0 Then
m_CurrentDirectory = StartDir & vbNullChar
Else
m_CurrentDirectory = vbNullChar
End If
If Len(Title) > 0 Then
tBrowseInfo.lpszTitle = lstrcat(Title, "")
Else
tBrowseInfo.lpszTitle = lstrcat("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 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 (owner Is Nothing) Then tBrowseInfo.hWndOwner = owner.HWND
lpIDList = SHBrowseForFolder(tBrowseInfo)
If Len(RootDir) > 0 Then
If PathIsDirectory(RootDir) Then CoTaskMemFree lpIDList2
End If
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
