by Kaustubh Zoal (10 Submissions)
Category: Windows API Call/Explanation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Fri 21st June 2002
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
This program displays a window through which the user can select a folder.The next time the user opens this window again, the user is taken to
VBcoders
Option Explicit
'--------------Start "browse for folder" declarations------------
Private Const BIF_STATUSTEXT = &H4&
Private Const BIF_RETURNONLYFSDIRS = 1
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 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 Long
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
Public Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type
Private m_CurrentDirectory As String 'The current directory
'-----End "Browse for folder" declarations----
'-------------Handle "browser for folder dialog----------
Public Function BrowseForFolder(ByVal lngHandle_IN As Long, 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 = ""
With tBrowseInfo
.hWndOwner = lngHandle_IN
.ulFlags = BIF_RETURNONLYFSDIRS + 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 Function
' This function allows you to assign a function pointer to a vaiable.
Private Function GetAddressofFunction(add As Long) As Long
GetAddressofFunction = add
End Function
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UserConrol1 : UserContro1l.ctl
Option Explicit
Public Event GetPath()
'Default Property Values:
Const m_def_DefaultPath = ""
'Property Variables:
Dim m_DefaultPath As String
Private Sub cmdBrowse_Click()
SelectPath
RaiseEvent GetPath
txtPath.SetFocus
End Sub
Private Sub txtPath_GotFocus()
HighLightText
End Sub
Private Sub txtPath_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 And Trim(txtPath.Text) <> "" Then
Call SelectPath
RaiseEvent GetPath
End If
End Sub
'Initialize Properties for User Control
Private Sub UserControl_InitProperties()
On Error GoTo InitializeError
m_DefaultPath = m_def_DefaultPath
UserControl.Height = txtPath.Height
Exit Sub
InitializeError:
'ActiveX Component Cant Create Object Error
'If Err.Number = 429 Then
MsgBox "Required files may be missing!!!" & vbCrLf & "Error Desription : " & Err.Description, vbCritical + vbOKOnly, "Error"
'End If
End Sub
Private Sub UserControl_ReadProperties(PropBag As PropertyBag)
m_DefaultPath = PropBag.ReadProperty("DefaultPath", m_def_DefaultPath)
End Sub
Private Sub UserControl_Resize()
ResizeControls
End Sub
Private Sub SelectPath()
On Error GoTo errHandlerSection
Dim sPath As String
sPath = BrowseForFolder(UserControl.hwnd, "Select Path", DefaultPath)
If sPath <> "" Then
DefaultPath = sPath
End If
Exit Sub
errHandlerSection:
MsgBox "Cannot select the path." & vbCrLf & "Error Description : " & Err.Description, vbCritical + vbOKOnly, "Error"
End Sub
Private Sub ResizeControls()
On Error Resume Next
'Set the TextBox's Left/Top/Height/Width Properties
txtPath.Top = 0
txtPath.Left = 0
txtPath.Height = UserControl.Height
txtPath.Width = UserControl.Width - cmdBrowse.Width
'Set the Command Buttons Left/Top/Height/Width Properties
cmdBrowse.Top = 0
cmdBrowse.Left = UserControl.Width - cmdBrowse.Width
cmdBrowse.Height = txtPath.Height
End Sub
Private Sub HighLightText()
txtPath.SelStart = 0
txtPath.SelLength = Len(txtPath.Text)
End Sub
'WARNING! DO NOT REMOVE OR MODIFY THE FOLLOWING COMMENTED LINES!
'MemberInfo=13,0,0,
Public Property Get DefaultPath() As String
DefaultPath = m_DefaultPath
End Property
Public Property Let DefaultPath(ByVal New_DefaultPath As String)
m_DefaultPath = New_DefaultPath
PropertyChanged "DefaultPath"
End Property
---------------------------------------------------------------------------------------------------------------------------
Property Page : BrowsePropPage.pag
Option Explicit
Private Sub txtDefaultPath_Change()
Changed = True
End Sub
Private Sub PropertyPage_ApplyChanges()
SelectedControls(0).DefaultPath = txtDefaultPath.Text
End Sub
Private Sub PropertyPage_SelectionChanged()
txtDefaultPath.Text = SelectedControls(0).DefaultPath
End Sub
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