Attribute VB_Name = "modCommonDlg"
'*************************************************
'*******  模塊主要功能是取得公共對話框  **********
'*******  作用與CommonDialog控件相同    **********
'*************************************************


Option Explicit

Private Const cMaxPath = 1024
Private Const cMaxFile = 1024
Private Const sEmpty = ""


Public Enum EErrorCommonDialog
    eeBaseCommonDialog = 13450  ' CommonDialog
End Enum

Private Type OPENFILENAME
    lStructSize As Long          ' Filled with UDT size
    hwndOwner As Long            ' Tied to Owner
    hInstance As Long            ' Ignored (used only by templates)
    lpstrFilter As String        ' Tied to Filter
    lpstrCustomFilter As String  ' Ignored (exercise for reader)
    nMaxCustFilter As Long       ' Ignored (exercise for reader)
    nFilterIndex As Long         ' Tied to FilterIndex
    lpstrFile As String          ' Tied to FileName
    nMaxFile As Long             ' Handled internally
    lpstrFileTitle As String     ' Tied to FileTitle
    nMaxFileTitle As Long        ' Handled internally
    lpstrInitialDir As String    ' Tied to InitDir
    lpstrTitle As String         ' Tied to DlgTitle
    Flags As Long                ' Tied to Flags
    nFileOffset As Integer       ' Ignored (exercise for reader)
    nFileExtension As Integer    ' Ignored (exercise for reader)
    lpstrDefExt As String        ' Tied to DefaultExt
    lCustData As Long            ' Ignored (needed for hooks)
    lpfnHook As Long             ' Ignored (good luck with hooks)
    lpTemplateName As Long       ' Ignored (good luck with templates)
End Type

Private Declare Function GetOpenFileName Lib "COMDLG32" _
    Alias "GetOpenFileNameA" (file As OPENFILENAME) As Long
Private Declare Function GetSaveFileName Lib "COMDLG32" _
    Alias "GetSaveFileNameA" (file As OPENFILENAME) As Long
Private Declare Function GetFileTitle Lib "COMDLG32" _
    Alias "GetFileTitleA" (ByVal szFile As String, _
    ByVal szTitle As String, ByVal cbBuf As Long) As Long

Public Enum EOpenFile
    OFN_READONLY = &H1
    OFN_OVERWRITEPROMPT = &H2
    OFN_HIDEREADONLY = &H4
    OFN_NOCHANGEDIR = &H8
    OFN_SHOWHELP = &H10
    OFN_ENABLEHOOK = &H20
    OFN_ENABLETEMPLATE = &H40
    OFN_ENABLETEMPLATEHANDLE = &H80
    OFN_NOVALIDATE = &H100
    OFN_ALLOWMULTISELECT = &H200
    OFN_EXTENSIONDIFFERENT = &H400
    OFN_PATHMUSTEXIST = &H800
    OFN_FILEMUSTEXIST = &H1000
    OFN_CREATEPROMPT = &H2000
    OFN_SHAREAWARE = &H4000
    OFN_NOREADONLYRETURN = &H8000
    OFN_NOTESTFILECREATE = &H10000
    OFN_NONETWORKBUTTON = &H20000
    OFN_NOLONGNAMES = &H40000
    OFN_EXPLORER = &H80000
    OFN_NODEREFERENCELINKS = &H100000
    OFN_LONGNAMES = &H200000
End Enum

' Common dialog errors
Private Declare Function CommDlgExtendedError Lib "COMDLG32" () As Long

Public Enum EDialogError
    CDERR_DIALOGFAILURE = &HFFFF

    CDERR_GENERALCODES = &H0
    CDERR_STRUCTSIZE = &H1
    CDERR_INITIALIZATION = &H2
    CDERR_NOTEMPLATE = &H3
    CDERR_NOHINSTANCE = &H4
    CDERR_LOADSTRFAILURE = &H5
    CDERR_FINDRESFAILURE = &H6
    CDERR_LOADRESFAILURE = &H7
    CDERR_LOCKRESFAILURE = &H8
    CDERR_MEMALLOCFAILURE = &H9
    CDERR_MEMLOCKFAILURE = &HA
    CDERR_NOHOOK = &HB
    CDERR_REGISTERMSGFAIL = &HC

    PDERR_PRINTERCODES = &H1000
    PDERR_SETUPFAILURE = &H1001
    PDERR_PARSEFAILURE = &H1002
    PDERR_RETDEFFAILURE = &H1003
    PDERR_LOADDRVFAILURE = &H1004
    PDERR_GETDEVMODEFAIL = &H1005
    PDERR_INITFAILURE = &H1006
    PDERR_NODEVICES = &H1007
    PDERR_NODEFAULTPRN = &H1008
    PDERR_DNDMMISMATCH = &H1009
    PDERR_CREATEICFAILURE = &H100A
    PDERR_PRINTERNOTFOUND = &H100B
    PDERR_DEFAULTDIFFERENT = &H100C

    CFERR_CHOOSEFONTCODES = &H2000
    CFERR_NOFONTS = &H2001
    CFERR_MAXLESSTHANMIN = &H2002

    FNERR_FILENAMECODES = &H3000
    FNERR_SUBCLASSFAILURE = &H3001
    FNERR_INVALIDFILENAME = &H3002
    FNERR_BUFFERTOOSMALL = &H3003

    CCERR_CHOOSECOLORCODES = &H5000
End Enum

Function VBGetOpenFileName(FileName As String, _
                           Optional FileTitle As String, _
                           Optional FileMustExist As Boolean = True, _
                           Optional MultiSelect As Boolean = False, _
                           Optional ReadOnly As Boolean = False, _
                           Optional HideReadOnly As Boolean = False, _
                           Optional filter As String = "All (*.*)| *.*", _
                           Optional FilterIndex As Long = 1, _
                           Optional InitDir As String, _
                           Optional DlgTitle As String, _
                           Optional DefaultExt As String, _
                           Optional Owner As Long = -1, _
                           Optional Flags As Long = 0) As Boolean

    Dim opfile As OPENFILENAME, s As String, afFlags As Long

With opfile
    .lStructSize = Len(opfile)
    
    ' Add in specific flags and strip out non-VB flags
    .Flags = (-FileMustExist * OFN_FILEMUSTEXIST) Or _
             (-MultiSelect * OFN_ALLOWMULTISELECT) Or _
             (-ReadOnly * OFN_READONLY) Or _
             (-HideReadOnly * OFN_HIDEREADONLY) Or _
             (Flags And CLng(Not (OFN_ENABLEHOOK Or _
                                  OFN_ENABLETEMPLATE)))
    ' Owner can take handle of owning window
    If Owner <> -1 Then .hwndOwner = Owner
    ' InitDir can take initial directory string
    .lpstrInitialDir = InitDir
    ' DefaultExt can take default extension
    .lpstrDefExt = DefaultExt
    ' DlgTitle can take dialog box title
    .lpstrTitle = DlgTitle
    
    ' To make Windows-style filter, replace | and : with nulls
    Dim ch As String, i As Integer
    For i = 1 To Len(filter)
        ch = Mid$(filter, i, 1)
        If ch = "|" Or ch = ":" Then
            s = s & vbNullChar
        Else
            s = s & ch
        End If
    Next
    ' Put double null at end
    s = s & vbNullChar & vbNullChar
    .lpstrFilter = s
    .nFilterIndex = FilterIndex

    ' Pad file and file title buffers to maximum path
    s = FileName & String$(cMaxPath - Len(FileName), 0)
    .lpstrFile = s
    .nMaxFile = cMaxPath
    s = FileTitle & String$(cMaxFile - Len(FileTitle), 0)
    .lpstrFileTitle = s
    .nMaxFileTitle = cMaxFile
    ' All other fields set to zero
    
    If GetOpenFileName(opfile) Then
        VBGetOpenFileName = True
        FileName = Left$(.lpstrFile, Len(.lpstrFile))
        FileTitle = Left$(.lpstrFileTitle, Len(.lpstrFileTitle))
        Flags = .Flags
        ' Return the filter index
        FilterIndex = .nFilterIndex
        ' Look up the filter the user selected and return that
        filter = FilterLookup(.lpstrFilter, FilterIndex)
        If (.Flags And OFN_READONLY) Then ReadOnly = True
    Else
        VBGetOpenFileName = False
        FileName = sEmpty
        FileTitle = sEmpty
        Flags = 0
        FilterIndex = -1
        filter = sEmpty
    End If
End With
End Function

Function VBGetSaveFileName(FileName As String, _
                           Optional FileTitle As String, _
                           Optional OverWritePrompt As Boolean = True, _
                           Optional filter As String = "All (*.*)| *.*", _
                           Optional FilterIndex As Long = 1, _
                           Optional InitDir As String, _
                           Optional DlgTitle As String, _
                           Optional DefaultExt As String, _
                           Optional Owner As Long = -1, _
                           Optional Flags As Long) As Boolean
            
    Dim opfile As OPENFILENAME, s As String
With opfile
    .lStructSize = Len(opfile)
    
    ' Add in specific flags and strip out non-VB flags
    .Flags = (-OverWritePrompt * OFN_OVERWRITEPROMPT) Or _
             OFN_HIDEREADONLY Or _
             (Flags And CLng(Not (OFN_ENABLEHOOK Or _
                                  OFN_ENABLETEMPLATE)))
    ' Owner can take handle of owning window
    If Owner <> -1 Then .hwndOwner = Owner
    ' InitDir can take initial directory string
    .lpstrInitialDir = InitDir
    ' DefaultExt can take default extension
    .lpstrDefExt = DefaultExt
    ' DlgTitle can take dialog box title
    .lpstrTitle = DlgTitle
    
    ' Make new filter with bars (|) replacing nulls and double null at end
    Dim ch As String, i As Integer
    For i = 1 To Len(filter)
        ch = Mid$(filter, i, 1)
        If ch = "|" Or ch = ":" Then
            s = s & vbNullChar
        Else
            s = s & ch
        End If
    Next
    ' Put double null at end
    s = s & vbNullChar & vbNullChar
    .lpstrFilter = s
    .nFilterIndex = FilterIndex

    ' Pad file and file title buffers to maximum path
    s = FileName & String$(cMaxPath - Len(FileName), 0)
    .lpstrFile = s
    .nMaxFile = cMaxPath
    s = FileTitle & String$(cMaxFile - Len(FileTitle), 0)
    .lpstrFileTitle = s
    .nMaxFileTitle = cMaxFile
    ' All other fields zero
    
    If GetSaveFileName(opfile) Then
        VBGetSaveFileName = True
        FileName = Left$(.lpstrFile, Len(.lpstrFile))
        FileTitle = Left$(.lpstrFileTitle, Len(.lpstrFileTitle))
        Flags = .Flags
        ' Return the filter index
        FilterIndex = .nFilterIndex
        ' Look up the filter the user selected and return that
        filter = FilterLookup(.lpstrFilter, FilterIndex)
    Else
        VBGetSaveFileName = False
        FileName = sEmpty
        FileTitle = sEmpty
        Flags = 0
        FilterIndex = 0
        filter = sEmpty
    End If
End With
End Function

Private Function FilterLookup(ByVal sFilters As String, ByVal iCur As Long) As String
    Dim iStart As Long, iEnd As Long, s As String
    iStart = 1
    If sFilters = sEmpty Then Exit Function
    Do
        ' Cut out both parts marked by null character
        iEnd = InStr(iStart, sFilters, vbNullChar)
        If iEnd = 0 Then Exit Function
        iEnd = InStr(iEnd + 1, sFilters, vbNullChar)
        If iEnd Then
            s = Mid$(sFilters, iStart, iEnd - iStart)
        Else
            s = Mid$(sFilters, iStart)
        End If
        iStart = iEnd + 1
        If iCur = 1 Then
            FilterLookup = s
            Exit Function
        End If
        iCur = iCur - 1
    Loop While iCur
End Function

Function VBGetFileTitle(sFile As String) As String
    Dim sFileTitle As String, cFileTitle As Integer

    cFileTitle = cMaxPath
    sFileTitle = String$(cMaxPath, 0)
    cFileTitle = GetFileTitle(sFile, sFileTitle, cMaxPath)
    If cFileTitle Then
        VBGetFileTitle = sEmpty
    Else
        VBGetFileTitle = Left$(sFileTitle, InStr(sFileTitle, vbNullChar) - 1)
    End If

End Function