gcommondialog.cls

Visual Basic image processing. Mainly it occupies some filters to detect some prperties of image. Re

    epsuInches
    epsuMillimeters
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

' Hook and notification support:
Private Type NMHDR
    hwndFrom As Long
    idfrom As Long
    code As Long
End Type
'// Structure used for all file based OpenFileName notifications
Private Type OFNOTIFY
    hdr As NMHDR
    lpOFN As Long           ' Long pointer to OFN structure
    pszFile As String ';        // May be NULL
End Type

'// Structure used for all object based OpenFileName notifications
Private Type OFNOTIFYEX
    hdr As NMHDR
    lpOFN As Long       ' Long pointer to OFN structure
    psf As Long
    LPVOID As Long          '// May be NULL
End Type

Private Type OFNOTIFYshort
    hdr As NMHDR
    lpOFN As Long
End Type

' Messages:
Private Const WM_INITDIALOG = &H110
Private Const WM_NOTIFY = &H4E
Private Const WM_USER = &H400
Private Const WM_GETDLGCODE = &H87
Private Const WM_NCDESTROY = &H82


' Notification codes:
Private Const H_MAX As Long = &HFFFF + 1
Private Const CDN_FIRST = (H_MAX - 601)
Private Const CDN_LAST = (H_MAX - 699)

'// Notifications when Open or Save dialog status changes
Private Const CDN_INITDONE = (CDN_FIRST - &H0)
Private Const CDN_SELCHANGE = (CDN_FIRST - &H1)
Private Const CDN_FOLDERCHANGE = (CDN_FIRST - &H2)
Private Const CDN_SHAREVIOLATION = (CDN_FIRST - &H3)
Private Const CDN_HELP = (CDN_FIRST - &H4)
Private Const CDN_FILEOK = (CDN_FIRST - &H5)
Private Const CDN_TYPECHANGE = (CDN_FIRST - &H6)
Private Const CDN_INCLUDEITEM = (CDN_FIRST - &H7)

Private Const CDM_FIRST = (WM_USER + 100)
Private Const CDM_LAST = (WM_USER + 200)

Private Const DWL_MSGRESULT = 0
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

' ==========================================================================
' Implementation:
' ==========================================================================

' Array of custom colors lasts for life of app
Private alCustom(0 To 15) As Long, fNotFirst As Boolean

Public Enum EPrintRange
    eprAll
    eprPageNumbers
    eprSelection
End Enum
Private m_lApiReturn As Long
Private m_lExtendedError As Long
Private m_dvmode As DevMode
Private m_oEventSink As Object

Public Function DialogHook( _
        ByVal hDlg As Long, _
        ByVal msg As Long, _
        ByVal wParam As Long, _
        ByVal lParam As Long _
    )
Dim tNMH As NMHDR
Dim tOFNs As OFNOTIFYshort
Dim tOF As OPENFILENAME

    If Not (m_oEventSink Is Nothing) Then
        Select Case msg
        Case WM_INITDIALOG
            DialogHook = m_oEventSink.InitDialog(hDlg)
        Case WM_NOTIFY
            CopyMemory tNMH, ByVal lParam, Len(tNMH)
            Select Case tNMH.code
            Case CDN_SELCHANGE
                ' Changed selected file:
                DialogHook = m_oEventSink.FileChange(hDlg)
            Case CDN_FOLDERCHANGE
                ' Changed folder:
                DialogHook = m_oEventSink.FolderChange(hDlg)
            Case CDN_FILEOK
                ' Clicked OK:
                If Not m_oEventSink.ConfirmOK() Then
                    SetWindowLong hDlg, DWL_MSGRESULT, 1
                    DialogHook = 1
                Else
                    SetWindowLong hDlg, DWL_MSGRESULT, 0
                End If
            Case CDN_HELP
                ' Help clicked
            Case CDN_TYPECHANGE
                DialogHook = m_oEventSink.TypeChange(hDlg)
            Case CDN_INCLUDEITEM
                ' Hmmm
            End Select
        Case WM_NCDESTROY
            m_oEventSink.DialogClose
        End Select
    End If
End Function


Public Property Get APIReturn() As Long
    'return object's APIReturn property
    APIReturn = m_lApiReturn
End Property
Public Property Get ExtendedError() As Long
    'return object's ExtendedError property
    ExtendedError = m_lExtendedError
End Property

#If fComponent Then
Private Sub Class_Initialize()
    InitColors
End Sub
#End If

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
    
    m_lApiReturn = 0
    m_lExtendedError = 0

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$(MAX_PATH - Len(Filename), 0)
    .lpstrFile = s
    .nMaxFile = MAX_PATH
    s = FileTitle & String$(MAX_FILE - Len(FileTitle), 0)
    .lpstrFileTitle = s
    .nMaxFileTitle = MAX_FILE
    ' All other fields set to zero
    
    
    m_lApiReturn = GetOpenFileName(opfile)
    Set m_oEventSink = Nothing
    Select Case m_lApiReturn
    Case 1
        ' Success
        VBGetOpenFileName = True
        Filename = StrZToStr(.lpstrFile)
        FileTitle = StrZToStr(.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
    Case 0
        ' Cancelled
        VBGetOpenFileName = False
        Filename = ""
        FileTitle = ""
        flags = 0
        FilterIndex = -1
        Filter = ""
    Case Else
        ' Extended error
        m_lExtendedError = CommDlgExtendedError()
        VBGetOpenFileName = False
        Filename = ""
        FileTitle = ""
        flags = 0
        FilterIndex = -1
        Filter = ""
    End Select
    Set m_oEventSink = Nothing
End With
End Function
Private Function lHookAddress(lPtr As Long) As Long
    'Debug.Print lPtr
    lHookAddress = lPtr
End Function
Private Function StrZToStr(s As String) As String
    StrZToStr = Left$(s, lstrlen(s))
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

    m_lApiReturn = 0
    m_lExtendedError = 0

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$(MAX_PATH - Len(Filename), 0)
    .lpstrFile = s
    .nMaxFile = MAX_PATH
    s = FileTitle & String$(MAX_FILE - Len(FileTitle), 0)
    .lpstrFileTitle = s
    .nMaxFileTitle = MAX_FILE
    ' All other fields zero
    
    m_lApiReturn = GetSaveFileName(opfile)
    Set m_oEventSink = Nothing
    Select Case m_lApiReturn
    Case 1
        VBGetSaveFileName = True
        Filename = StrZToStr(.lpstrFile)
        FileTitle = StrZToStr(.lpstrFileTitle)
        flags = .flags
        ' Return the filter index
        FilterIndex = .nFilterIndex
        ' Look up the filter the user selected and return that
        Filter = FilterLookup(.lpstrFilter, FilterIndex)
    Case 0
        ' Cancelled:
        VBGetSaveFileName = False
        Filename = ""
        FileTitle = ""
        flags = 0
        FilterIndex = 0
        Filter = ""
    Case Else
        ' Extended error:
        VBGetSaveFileName = False
        m_lExtendedError = CommDlgExtendedError()
        Filename = ""
        FileTitle = ""
        flags = 0
        FilterIndex = 0
        Filter = ""
    End Select
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 = "" 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 = MAX_PATH
    sFileTitle = String$(MAX_PATH, 0)
    cFileTitle = GetFileTitle(sFIle, sFileTitle, MAX_PATH)
    If cFileTitle Then
        VBGetFileTitle = ""
    Else
        VBGetFileTitle = Left$(sFileTitle, InStr(sFileTitle, vbNullChar) - 1)
    End If

End Function

' ChooseColor wrapper