VB怎么点击一个按纽,然后出来目录浏览的界面？

Private Function Browse(csidl As Long, BIF_FLAGS As Long, sTitle As String) As String



  Dim pidl As Long

  Dim bi As BROWSEINFO

  Dim sPath As String

  Dim pos As Integer

  

  'Fill BROWSEINFO structure data

   With bi

      .hOwner = Me.hWnd

      .pidlRoot = CSIDLToPIDL(csidl)

      .lpszTitle = "Browsing " & sTitle

      .ulFlags = BIF_FLAGS

      .pszDisplayName = Space$(MAX_PATH)

   End With

  

  'show dialog returning pidl to selected item

   pidl = SHBrowseForFolder(bi)

 

  'if pidl is valid, parse & return the user's selection

   sPath = Space$(MAX_PATH)

    

   If SHGetPathFromIDList(ByVal pidl, ByVal sPath) Then

   

     'SHGetPathFromIDList returns the absolute

     'path to the selected item

      pos = InStr(sPath, Chr$(0))

      If pos > 0 Then Browse = Left(sPath, pos - 1)



   End If



  'pszDisplayName contains the string

  'representing the users last selection.

  'Even when SHGetPathFromIDList is empty,

  'this should return the selection, making

  'it the choice for obtaining user information

  'when selecting Printers, Control Panel etc,

  'or any of the other virtual folders that

  'do not normally return a path

   pos = InStr(bi.pszDisplayName, Chr$(0))

   If pos > 0 Then

      Text3.Text = Left(bi.pszDisplayName, pos - 1)

   Else

      Text3.Text = ""

   End If

   

  'free the pidl

   Call CoTaskMemFree(pidl)

        

End Function





Private Function CSIDLToPIDL(ByVal csidl As Long) As Long



  Dim pidl As Long



  If csidl > 0 Then

      If SHGetSpecialFolderLocation(Me.hWnd, csidl, pidl) = S_OK Then

         CSIDLToPIDL = pidl

      End If

   Else

      CSIDLToPIDL = 0&

   End If

End Function





Private Function IsWinXPPlus() As Boolean



  'returns True if running Windows XP or later

   Dim osv As OSVERSIONINFO



   osv.OSVSize = Len(osv)



   If GetVersionEx(osv) = 1 Then

   

      IsWinXPPlus = (osv.PlatformID = VER_PLATFORM_WIN32_NT) And _

                    (osv.dwVerMajor >= 5 And osv.dwVerMinor >= 1)



   End If



End Function





Private Sub LoadCombo()



   With Combo1



      .AddItem "Desktop (default browse)":

      .ItemData(.NewIndex) = CSIDL_DESKTOP



      .AddItem "Internet Explorer (icon on desktop)"

      .ItemData(.NewIndex) = CSIDL_INTERNET



      .AddItem "Start Menu\Programs"

      .ItemData(.NewIndex) = CSIDL_PROGRAMS



      .AddItem "Control Panel"

      .ItemData(.NewIndex) = CSIDL_CONTROLS



      .AddItem "Printers"

      .ItemData(.NewIndex) = CSIDL_PRINTERS



      .AddItem "My Documents"

      .ItemData(.NewIndex) = CSIDL_PERSONAL



      .AddItem "Favorites (Current User)"

      .ItemData(.NewIndex) = CSIDL_FAVORITES



      .AddItem "Start Menu\Programs\Startup"

      .ItemData(.NewIndex) = CSIDL_STARTUP



      .AddItem "Recent (Current User)"

      .ItemData(.NewIndex) = CSIDL_RECENT



      .AddItem "SendTo (Current User)"

      .ItemData(.NewIndex) = CSIDL_SENDTO



      .AddItem "Recycle Bin (desktop)"

      .ItemData(.NewIndex) = CSIDL_BITBUCKET



      .AddItem "Start Menu (Current User)"

      .ItemData(.NewIndex) = CSIDL_STARTMENU



      .AddItem "WinXP+ : Logical My Documents desktop icon"

      .ItemData(.NewIndex) = CSIDL_MYDOCUMENTS

      

      .AddItem "WinXP+ : My Music folder"

      .ItemData(.NewIndex) = CSIDL_MYMUSIC

      

      .AddItem "WinXP+ : My Videos folder"

      .ItemData(.NewIndex) = CSIDL_MYVIDEO

          

      .AddItem "Desktop Directory (Current User)"

      .ItemData(.NewIndex) = CSIDL_DESKTOPDIRECTORY



      .AddItem "My Computer"

      .ItemData(.NewIndex) = CSIDL_DRIVES



      .AddItem "Network Neighborhood"

      .ItemData(.NewIndex) = CSIDL_NETWORK



      .AddItem "NetHood (Current User)"

      .ItemData(.NewIndex) = CSIDL_NETHOOD



      .AddItem "Fonts"

      .ItemData(.NewIndex) = CSIDL_FONTS



      .AddItem "Templates"

      .ItemData(.NewIndex) = CSIDL_TEMPLATES

      

      .AddItem "Start Menu (All Users) (NT or later)"

      .ItemData(.NewIndex) = CSIDL_COMMON_STARTMENU



      .AddItem "Programs (All Users) (NT or later)"

      .ItemData(.NewIndex) = CSIDL_COMMON_PROGRAMS



      .AddItem "Startup (All Users) (NT or later)"

      .ItemData(.NewIndex) = CSIDL_COMMON_STARTUP



      .AddItem "Desktop Directory (All Users)"

      .ItemData(.NewIndex) = CSIDL_COMMON_DESKTOPDIRECTORY



      .AddItem "Application Data (Current User)"

      .ItemData(.NewIndex) = CSIDL_APPDATA



      .AddItem "PrintHood (Current User)"

      .ItemData(.NewIndex) = CSIDL_PRINTHOOD



      .AddItem "Win2k+ : Application Data (Current User, non roaming)"

      .ItemData(.NewIndex) = CSIDL_LOCAL_APPDATA



      .AddItem "Non-localized Startup"

      .ItemData(.NewIndex) = CSIDL_ALTSTARTUP



      .AddItem "Non-localized Common Startup (NT or later)"

      .ItemData(.NewIndex) = CSIDL_COMMON_ALTSTARTUP



      .AddItem "Common Favorites"

      .ItemData(.NewIndex) = CSIDL_COMMON_FAVORITES



      .AddItem "Internet Cache"

      .ItemData(.NewIndex) = CSIDL_INTERNET_CACHE



      .AddItem "Internet Cookies"

      .ItemData(.NewIndex) = CSIDL_COOKIES



      .AddItem "Internet History"

      .ItemData(.NewIndex) = CSIDL_HISTORY



      .AddItem "Win2k+ : Application Data (All Users)"

      .ItemData(.NewIndex) = CSIDL_COMMON_APPDATA



      .AddItem "Win2k+ : Windows Directory"

      .ItemData(.NewIndex) = CSIDL_WINDOWS



      .AddItem "Win2k+ : System Directory"

      .ItemData(.NewIndex) = CSIDL_SYSTEM



      .AddItem "Win2k+ : Program Files"

      .ItemData(.NewIndex) = CSIDL_PROGRAM_FILES



      .AddItem "Win2k+ : My Pictures"

      .ItemData(.NewIndex) = CSIDL_MYPICTURES



      .AddItem "Win2k+ : User Profile (Current User)"

      .ItemData(.NewIndex) = CSIDL_PROFILE



      .AddItem "Win2k+ : Program Files\Common (NT or later)"

      .ItemData(.NewIndex) = CSIDL_PROGRAM_FILES_COMMON



     .AddItem "Templates (All Users) (NT or later)"

     .ItemData(.NewIndex) = CSIDL_COMMON_TEMPLATES



     .AddItem "Documents (All Users) (NT or later)"

     .ItemData(.NewIndex) = CSIDL_COMMON_DOCUMENTS



     .AddItem "Win2k+ : Administrative Tools (All Users)"

     .ItemData(.NewIndex) = CSIDL_COMMON_ADMINTOOLS



     .AddItem "Win2k+ : Administrative Tools (Current User)"

     .ItemData(.NewIndex) = CSIDL_ADMINTOOLS

     

     .AddItem "WinXP+ : Network and Dial-up Connections"

     .ItemData(.NewIndex) = CSIDL_CONNECTIONS

     

     .AddItem "WinXP+ : (shared music) All Users\My Music"

     .ItemData(.NewIndex) = CSIDL_COMMON_MUSIC

     

     .AddItem "WinXP+ : (shared pictures) All Users\My Pictures"

     .ItemData(.NewIndex) = CSIDL_COMMON_PICTURES

     

     .AddItem "WinXP+ : (shared video) All Users\My Video"

     .ItemData(.NewIndex) = CSIDL_COMMON_VIDEO

     

     .AddItem "WinXP+ : Resource Directory (themes parent folder)"

     .ItemData(.NewIndex) = CSIDL_RESOURCES

     

     .AddItem "WinXP+ : Localized Resource Directory"

     .ItemData(.NewIndex) = CSIDL_RESOURCES_LOCALIZED



     .AddItem "WinXP+ : Links to All Users OEM specific apps"

     .ItemData(.NewIndex) = CSIDL_COMMON_OEM_LINKS

     

     .AddItem "WinXP+ : CD Burning (USERPROFILE\Local Settings\Application Data\Microsoft\)"

     .ItemData(.NewIndex) = CSIDL_CDBURN_AREA

     

     .AddItem "WinXP+ : Computers Near Me (computered from Workgroup membership)"

     .ItemData(.NewIndex) = CSIDL_COMPUTERSNEARME

   

     .ListIndex = 3  'desktop (default browse)



   End With



End Sub

Private Const VER_PLATFORM_WIN32_NT As Long = 2

Private Const S_OK  As Long = 0

Private Const MAX_PATH As Long = 260



'BROWSEINFO.ulFlags values

Private Const BIF_RETURNONLYFSDIRS   As Long = &H1 'only file system directories

Private Const BIF_DONTGOBELOWDOMAIN As Long = &H2  'no network folders below domain level

Private Const BIF_STATUSTEXT As Long = &H4         'include status area for callback

Private Const BIF_RETURNFSANCESTORS As Long = &H8  'only return file system ancestors

Private Const BIF_EDITBOX As Long = &H10           'add edit box 

Private Const BIF_NEWDIALOGSTYLE As Long = &H40    'use the new dialog layout

Private Const BIF_UAHINT As Long = &H100

Private Const BIF_NONEWFOLDERBUTTON As Long = &H200 'hide new folder button

Private Const BIF_NOTRANSLATETARGETS As Long = &H400 'return lnk file

Private Const BIF_USENEWUI As Long = BIF_NEWDIALOGSTYLE Or BIF_EDITBOX

Private Const BIF_BROWSEFORCOMPUTER As Long = &H1000 'only return computers

Private Const BIF_BROWSEFORPRINTER As Long = &H2000 'only return printers

Private Const BIF_BROWSEINCLUDEFILES As Long = &H4000 'browse for everything

Private Const BIF_SHAREABLE As Long = &H8000 'sharable resources, requires BIF_USENEWUI



'class ID values

Private Const CSIDL_DESKTOP As Long = &H0

Private Const CSIDL_INTERNET As Long = &H1

Private Const CSIDL_PROGRAMS As Long = &H2

Private Const CSIDL_CONTROLS As Long = &H3

Private Const CSIDL_PRINTERS As Long = &H4

Private Const CSIDL_PERSONAL As Long = &H5

Private Const CSIDL_FAVORITES As Long = &H6

Private Const CSIDL_STARTUP As Long = &H7

Private Const CSIDL_RECENT As Long = &H8

Private Const CSIDL_SENDTO As Long = &H9

Private Const CSIDL_BITBUCKET As Long = &HA

Private Const CSIDL_STARTMENU As Long = &HB

Private Const CSIDL_MYDOCUMENTS As Long = &HC

Private Const CSIDL_MYMUSIC As Long = &HD

Private Const CSIDL_MYVIDEO As Long = &HE

Private Const CSIDL_UNUSED1 As Long = &HF '&HF not currently implemented

Private Const CSIDL_DESKTOPDIRECTORY As Long = &H10

Private Const CSIDL_DRIVES As Long = &H11

Private Const CSIDL_NETWORK As Long = &H12

Private Const CSIDL_NETHOOD As Long = &H13

Private Const CSIDL_FONTS As Long = &H14

Private Const CSIDL_TEMPLATES As Long = &H15

Private Const CSIDL_COMMON_STARTMENU As Long = &H16

Private Const CSIDL_COMMON_PROGRAMS As Long = &H17

Private Const CSIDL_COMMON_STARTUP As Long = &H18

Private Const CSIDL_COMMON_DESKTOPDIRECTORY As Long = &H19

Private Const CSIDL_APPDATA As Long = &H1A

Private Const CSIDL_PRINTHOOD As Long = &H1B

Private Const CSIDL_LOCAL_APPDATA As Long = &H1C

Private Const CSIDL_ALTSTARTUP As Long = &H1D

Private Const CSIDL_COMMON_ALTSTARTUP As Long = &H1E

Private Const CSIDL_COMMON_FAVORITES As Long = &H1F

Private Const CSIDL_INTERNET_CACHE As Long = &H20

Private Const CSIDL_COOKIES As Long = &H21

Private Const CSIDL_HISTORY As Long = &H22

Private Const CSIDL_COMMON_APPDATA As Long = &H23

Private Const CSIDL_WINDOWS As Long = &H24

Private Const CSIDL_SYSTEM As Long = &H25

Private Const CSIDL_PROGRAM_FILES As Long = &H26

Private Const CSIDL_MYPICTURES As Long = &H27

Private Const CSIDL_PROFILE As Long = &H28

Private Const CSIDL_SYSTEMX86 As Long = &H29 'RISC only

Private Const CSIDL_PROGRAM_FILESX86 As Long = &H2A 'RISC only

Private Const CSIDL_PROGRAM_FILES_COMMON As Long = &H2B

Private Const CSIDL_PROGRAM_FILES_COMMONX86 As Long = &H2C 'RISC only

Private Const CSIDL_COMMON_TEMPLATES As Long = &H2D

Private Const CSIDL_COMMON_DOCUMENTS As Long = &H2E

Private Const CSIDL_COMMON_ADMINTOOLS As Long = &H2F

Private Const CSIDL_ADMINTOOLS As Long = &H30

Private Const CSIDL_CONNECTIONS As Long = &H31

Private Const CSIDL_COMMON_MUSIC As Long = &H35

Private Const CSIDL_COMMON_PICTURES As Long = &H36

Private Const CSIDL_COMMON_VIDEO As Long = &H37

Private Const CSIDL_RESOURCES As Long = &H38

Private Const CSIDL_RESOURCES_LOCALIZED As Long = &H39

Private Const CSIDL_COMMON_OEM_LINKS As Long = &H3A

Private Const CSIDL_CDBURN_AREA As Long = &H3B

Private Const CSIDL_UNUSED2 As Long = &H3C '&H3C not currently implemented

Private Const CSIDL_COMPUTERSNEARME As Long = &H3D



'special flags

Private Const CSIDL_FLAG_PER_USER_INIT As Long = &H800 

Private Const CSIDL_FLAG_NO_ALIAS As Long = &H1000 

Private Const CSIDL_FLAG_DONT_VERIFY As Long = &H4000 

Private Const CSIDL_FLAG_CREATE As Long = &H8000 

Private Const CSIDL_FLAG_MASK As Long = &HFF00 



'windows-defined type OSVERSIONINFO

Private Type OSVERSIONINFO

  OSVSize         As Long

  dwVerMajor      As Long

  dwVerMinor      As Long

  dwBuildNumber   As Long

  PlatformID      As Long

  szCSDVersion    As String * 128

End Type



'parameters for SHBrowseForFolder

Private Type BROWSEINFO    'BI

    hOwner As Long

    pidlRoot As Long

    pszDisplayName As String

    lpszTitle As String

    ulFlags As Long

    lpfn As Long

    lParam As Long

    iImage As Long

End Type



Private Declare Function SHGetPathFromIDList Lib "shell32.dll" _

   Alias "SHGetPathFromIDListA" _

  (ByVal pidl As Long, _

   ByVal pszPath As String) As Long



Private Declare Function SHBrowseForFolder Lib "shell32.dll" _

   Alias "SHBrowseForFolderA" _

  (lpBrowseInfo As BROWSEINFO) As Long



Private Declare Function SHGetSpecialFolderLocation Lib "shell32.dll" _

  (ByVal hwndOwner As Long, _

   ByVal nFolder As Long, _

   pidl As Long) As Long



Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" _

  (lpVersionInformation As OSVERSIONINFO) As Long



Private Declare Sub CoTaskMemFree Lib "ole32.dll" _

  (ByVal pv As Long)







Private Sub Form_Load()

   

   Command1.Caption = "Browse"

   

   Check1.Caption = "Include files as well as folders in dialog"

   Check2.Caption = "Use new dialog style (resizable w/new folder button)"

   

   Check3.Caption = "Include edit box"

   Check4.Caption = "Use UA Hint (edit box overrides)"

   

   Check5.Caption = "Hide the New Folder button"

   Check6.Caption = "Return shortcut; don't traverse to file ( XP or later )"

   

   Text1.Text = ""

   Text2.Text = ""

   Text3.Text = ""

   Text4.Text = ""

   

   Check2_Click

   

   Check6.Enabled = IsWinXPPlus()

   

   Call LoadCombo

   

End Sub





Private Sub Command1_Click()



   Dim dwFlags As Long

   Dim sTitle As String

   Dim csidl As Long

   

   

  'build dwFlags according to the options selected

   If Check1.Value = vbChecked Then dwFlags = dwFlags Or BIF_BROWSEINCLUDEFILES

   If Check2.Value = vbChecked Then dwFlags = dwFlags Or BIF_NEWDIALOGSTYLE

   If Check3.Value = vbChecked Then dwFlags = dwFlags Or BIF_EDITBOX

   If Check4.Value = vbChecked Then dwFlags = dwFlags Or BIF_UAHINT

   If Check5.Value = vbChecked Then dwFlags = dwFlags Or BIF_NONEWFOLDERBUTTON

   If Check6.Value = vbChecked Then dwFlags = dwFlags Or BIF_NOTRANSLATETARGETS

  

   sTitle = Combo1.List(Combo1.ListIndex)

   csidl = Combo1.ItemData(Combo1.ListIndex)

   

   Text4.Text = Browse(csidl, dwFlags, sTitle)

   

End Sub





Private Sub Combo1_Click()



   Dim csidl As Long

   csidl = Combo1.ItemData(Combo1.ListIndex)

   Text1.Text = csidl

   Text2.Text = "&H" & CStr(Hex(csidl))

   

End Sub





Private Sub Check2_Click()



   Check3.Enabled = Check2.Value = vbChecked

   Check4.Enabled = Check2.Value = vbChecked

   Check5.Enabled = Check2.Value = vbChecked



End Sub