patriciaxxx
Programmer
I Can’t get the Open File Dialog by Ken Getz to work in multiselect for large numbers of files.
To be more precise it works, or at least I can’t seem to raise an error, when the multiselect flag is not used ie selecting a single file. It too works in multiselect for small number of files say 6 or 8. but if you want to select a whole big bunch of files say 100 or something then it returns no files?
I know Ken’s code is really quite old, and that’s probably the problem.
What I don’t know, and it’s not through a lack of searching, is whether there is a fix or update to his code which can be applied to make it work properly or whether it just won’t work properly. By properly I of course mean being able to return however many files you selected when in multiselect mode?
I have posted the full code below in the hope that someone will know the answer and let me know.
To be more precise it works, or at least I can’t seem to raise an error, when the multiselect flag is not used ie selecting a single file. It too works in multiselect for small number of files say 6 or 8. but if you want to select a whole big bunch of files say 100 or something then it returns no files?
I know Ken’s code is really quite old, and that’s probably the problem.
What I don’t know, and it’s not through a lack of searching, is whether there is a fix or update to his code which can be applied to make it work properly or whether it just won’t work properly. By properly I of course mean being able to return however many files you selected when in multiselect mode?
I have posted the full code below in the hope that someone will know the answer and let me know.
Code:
Option Compare Database
Option Explicit
'***************** Code Start **************
'This code was originally written by Ken Getz.
'It is not to be altered or distributed,
'except as part of an application.
'You are free to use it in any application,
'provided the copyright notice is left unchanged.
'
'Code courtesy of:
'Microsoft Access 95 How-To
'Ken Getz and Paul Litwin
'Waite Group Press, 1996
'Also based on code here:
'[URL unfurl="true"]http://www.mvps.org/vbnet/index.html?code/callback/browsecallback.htm[/URL]
Type tagOPENFILENAME
lStructSize As Long
hwndOwner As Long
hInstance As Long
strFilter As String
strCustomFilter As String
nMaxCustFilter As Long
nFilterIndex As Long
strFile As String
nMaxFile As Long
strFileTitle As String
nMaxFileTitle As Long
strInitialDir As String
strTitle As String
Flags As Long
nFileOffset As Integer
nFileExtension As Integer
strDefExt As String
lCustData As Long
lpfnHook As Long
lpTemplateName As String
End Type
Public Const WM_INITDIALOG = &H110
Private Const SW_SHOWNORMAL = 1
Private Type POINTAPI
x As Long
Y As Long
End Type
Public Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Public Declare Function GetParent Lib "user32" _
(ByVal hWnd As Long) As Long
Public Declare Function MoveWindow Lib "user32" _
(ByVal hWnd As Long, _
ByVal x As Long, _
ByVal Y As Long, _
ByVal nWidth As Long, _
ByVal nHeight As Long, _
ByVal bRepaint As Long) As Long
Public Declare Function GetWindowRect Lib "user32" _
(ByVal hWnd As Long, _
lpRect As RECT) As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Declare Function aht_apiGetOpenFileName Lib "comdlg32.dll" _
Alias "GetOpenFileNameA" (OFN As tagOPENFILENAME) As Boolean
Declare Function aht_apiGetSaveFileName Lib "comdlg32.dll" _
Alias "GetSaveFileNameA" (OFN As tagOPENFILENAME) As Boolean
Declare Function CommDlgExtendedError Lib "comdlg32.dll" () As Long
Global Const ahtOFN_READONLY = &H1
Global Const ahtOFN_OVERWRITEPROMPT = &H2
Global Const ahtOFN_HIDEREADONLY = &H4
Global Const ahtOFN_NOCHANGEDIR = &H8
Global Const ahtOFN_SHOWHELP = &H10
'You won't use these.
Global Const ahtOFN_ENABLEHOOK = &H20
'Global Const ahtOFN_ENABLETEMPLATE = &H40
'Global Const ahtOFN_ENABLETEMPLATEHANDLE = &H80
Global Const ahtOFN_NOVALIDATE = &H100
Global Const ahtOFN_ALLOWMULTISELECT = &H200
Global Const ahtOFN_EXTENSIONDIFFERENT = &H400
Global Const ahtOFN_PATHMUSTEXIST = &H800
Global Const ahtOFN_FILEMUSTEXIST = &H1000
Global Const ahtOFN_CREATEPROMPT = &H2000
Global Const ahtOFN_SHAREAWARE = &H4000
Global Const ahtOFN_NOREADONLYRETURN = &H8000
Global Const ahtOFN_NOTESTFILECREATE = &H10000
Global Const ahtOFN_NONETWORKBUTTON = &H20000
Global Const ahtOFN_NOLONGNAMES = &H40000
'New for Windows 95
Global Const ahtOFN_EXPLORER = &H80000
Global Const ahtOFN_NODEREFERENCELINKS = &H100000
Global Const ahtOFN_LONGNAMES = &H200000
Function TestIt()
Dim strFilter As String
Dim lngFlags As Long
strFilter = ahtAddFilterItem(strFilter, "Access Files (*.mda, *.mdb)", _
"*.MDA;*.MDB")
strFilter = ahtAddFilterItem(strFilter, "dBASE Files (*.dbf)", "*.DBF")
strFilter = ahtAddFilterItem(strFilter, "Text Files (*.txt)", "*.TXT")
strFilter = ahtAddFilterItem(strFilter, "All Files (*.*)", "*.*")
'Uncomment this line to try the example
'allowing multiple file names:
'lngFlags = ahtOFN_ALLOWMULTISELECT Or ahtOFN_EXPLORER
Dim result As Variant
result = ahtCommonFileOpenSave(InitialDir:="C:\", _
FILTER:=strFilter, FilterIndex:=3, Flags:=lngFlags, _
DialogTitle:="Hello! Open Me!")
If lngFlags And ahtOFN_ALLOWMULTISELECT Then
If IsArray(result) Then
Dim i As Integer
For i = 0 To UBound(result)
MsgBox result(i)
Next i
Else
MsgBox result
End If
Else
MsgBox result
End If
'Since you passed in a variable for lngFlags,
'the function places the output flags value in the variable.
Debug.Print Hex(lngFlags)
End Function
Function GetOpenFile(Optional varDirectory As Variant, _
Optional varTitleForDialog As Variant) As Variant
'Here's an example that gets an Access database name.
Dim strFilter As String
Dim lngFlags As Long
Dim varFileName As Variant
'Specify that the chosen file must already exist,
'don't change directories when you're done
'Also, don't bother displaying
'the read-only box. It'll only confuse people.
lngFlags = ahtOFN_FILEMUSTEXIST Or _
ahtOFN_HIDEREADONLY Or ahtOFN_NOCHANGEDIR
If IsMissing(varDirectory) Then
varDirectory = ""
End If
If IsMissing(varTitleForDialog) Then
varTitleForDialog = ""
End If
'Define the filter string and allocate space in the "c"
'string Duplicate this line with changes as necessary for
'more file templates.
strFilter = ahtAddFilterItem(strFilter, _
"Access (*.mdb)", "*.MDB;*.MDA")
'Now actually call to get the file name.
varFileName = ahtCommonFileOpenSave( _
OpenFile:=True, _
InitialDir:=varDirectory, _
FILTER:=strFilter, _
Flags:=lngFlags, _
DialogTitle:=varTitleForDialog)
If Not IsNull(varFileName) Then
varFileName = TrimNull(varFileName)
End If
GetOpenFile = varFileName
End Function
Function ahtCommonFileOpenSave( _
Optional ByRef Flags As Variant, _
Optional ByVal InitialDir As Variant, _
Optional ByVal FILTER As Variant, _
Optional ByVal FilterIndex As Variant, _
Optional ByVal DefaultExt As Variant, _
Optional ByVal FileName As Variant, _
Optional ByVal DialogTitle As Variant, _
Optional ByVal hWnd As Variant, _
Optional ByVal OpenFile As Variant) As Variant
'This is the entry point you'll use to call the common
'file open/save dialog. The parameters are listed
'below, and all are optional.
'In:
'Flags: one or more of the ahtOFN_* constants, OR'd together.
'InitialDir: the directory in which to first look
'Filter: a set of file filters, set up by calling
'AddFilterItem. See examples.
'FilterIndex: 1-based integer indicating which filter
'set to use, by default (1 if unspecified)
'DefaultExt: Extension to use if the user doesn't enter one.
'Only useful on file saves.
'FileName: Default value for the file name text box.
'DialogTitle: Title for the dialog.
'hWnd: parent window handle
'OpenFile: Boolean(True=Open File/False=Save As)
'Out:
'Return Value: Either Null or the selected filename
Dim OFN As tagOPENFILENAME
Dim strFileName As String
Dim strFileTitle As String
Dim fResult As Boolean
'Give the dialog a caption title.
If IsMissing(InitialDir) Then InitialDir = CurDir
If IsMissing(FILTER) Then FILTER = ""
If IsMissing(FilterIndex) Then FilterIndex = 1
If IsMissing(Flags) Then Flags = 0&
If IsMissing(DefaultExt) Then DefaultExt = ""
If IsMissing(FileName) Then FileName = ""
If IsMissing(DialogTitle) Then DialogTitle = ""
If IsMissing(hWnd) Then hWnd = Application.hWndAccessApp
If IsMissing(OpenFile) Then OpenFile = True
'Allocate string space for the returned strings.
strFileName = Left(FileName & String(512, 0), 512)
strFileTitle = String(512, 0)
'Set up the data structure before you call the function
With OFN
.lStructSize = Len(OFN)
.hwndOwner = hWnd
.strFilter = FILTER
.nFilterIndex = FilterIndex
.strFile = strFileName
.nMaxFile = Len(strFileName)
.strFileTitle = strFileTitle
.nMaxFileTitle = Len(strFileTitle)
.strTitle = DialogTitle
'We must specify the EXPLORER and HOOK flaga since we are using a hook
.Flags = Flags Or ahtOFN_EXPLORER Or ahtOFN_ENABLEHOOK
.strDefExt = DefaultExt
.strInitialDir = InitialDir
'Didn't think most people would want to deal with
'these options.
.hInstance = 0
'strCustomFilter = ""
'nMaxCustFilter = 0
.lpfnHook = FARPROC(AddressOf FileDialogHook)
'New for NT 4.0
.strCustomFilter = String(255, 0)
.nMaxCustFilter = 255
End With
'This will pass the desired data structure to the
'Windows API, which will in turn it uses to display
'the Open/Save As Dialog.
If OpenFile Then
fResult = aht_apiGetOpenFileName(OFN)
Else
fResult = aht_apiGetSaveFileName(OFN)
End If
'The function call filled in the strFileTitle member
'of the structure. You'll have to write special code
'to retrieve that if you're interested.
'The function call filled in the strFileTitle member
'of the structure. You'll have to write special code
'to retrieve that if you're interested.
If fResult Then
'You might care to check the Flags member of the
'structure to get information about the chosen file.
'In this example, if you bothered to pass in a
'value for Flags, we'll fill it in with the outgoing
'Flags value.
If Not IsMissing(Flags) Then Flags = OFN.Flags
If Flags And ahtOFN_ALLOWMULTISELECT Then
'Return the full array.
Dim items As Variant
Dim value As String
value = OFN.strFile
'Get rid of empty items:
Dim i As Integer
For i = Len(value) To 1 Step -1
If Mid$(value, i, 1) <> Chr$(0) Then
Exit For
End If
Next i
value = Mid(value, 1, i)
'Break the list up at null characters:
items = Split(value, Chr(0))
'Loop through the items in the "array",
'and build full file names:
Dim numItems As Integer
Dim result() As String
numItems = UBound(items) + 1
If numItems > 1 Then
ReDim result(0 To numItems - 2)
For i = 1 To numItems - 1
result(i - 1) = FixPath(items(0)) & items(i)
Next i
ahtCommonFileOpenSave = result
Else
'If you only select a single item,
'Windows just places it in item 0.
ahtCommonFileOpenSave = items(0)
End If
Else
ahtCommonFileOpenSave = TrimNull(OFN.strFile)
End If
Else
ahtCommonFileOpenSave = vbNullString
End If
End Function
Function ahtAddFilterItem(strFilter As String, _
strDescription As String, Optional varItem As Variant) As String
'Tack a new chunk onto the file filter.
'That is, take the old value, stick onto it the description,
'(like "Databases"), a null character, the skeleton
'(like "*.mdb;*.mda") and a final null character.
If IsMissing(varItem) Then varItem = "*.*"
ahtAddFilterItem = strFilter & _
strDescription & vbNullChar & _
varItem & vbNullChar
End Function
Private Function TrimNull(ByVal strItem As String) As String
Dim intPos As Integer
intPos = InStr(strItem, vbNullChar)
If intPos > 0 Then
TrimNull = Left(strItem, intPos - 1)
Else
TrimNull = strItem
End If
End Function
Private Function FixPath(ByVal path As String) As String
If Right$(path, 1) <> "\" Then
FixPath = path & "\"
Else
FixPath = path
End If
End Function
'************** Code End *****************
Public Function FARPROC(ByVal pfn As Long) As Long
'A dummy procedure that receives and returns
'the return value of the AddressOf operator.
'Obtain and set the address of the callback
'This workaround is needed as you can't assign
'AddressOf directly to a member of a user-
'defined type, but you can assign it to another
'long and use that (as returned here)
FARPROC = pfn
End Function
Public Function FileDialogHook(ByVal hWnd As Long, _
ByVal uMsg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
'Show File Dialog window at current cursor coordinates
Dim pt As POINTAPI
Dim hWndParent As Long
Dim rc As RECT
Select Case uMsg
Case WM_INITDIALOG
'obtain the handle to the parent dialog
hWndParent = GetParent(hWnd)
If hWndParent = 0 Then
FileDialogHook = 0
Exit Function
End If
Call GetCursorPos(pt)
Call GetWindowRect(hWndParent, rc)
'Call MoveWindow(hWndParent, pt.X - 500, pt.Y - 200, rc.Right - rc.Left, rc.Bottom - rc.Top, True)
Call MoveWindow(hWndParent, 50, 50, rc.Right - rc.Left, rc.Bottom - rc.Top, True)
FileDialogHook = 1
Case Else
End Select
End Function
