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/DynaPDF/Raster/DynaPDF Raster to MemoryBlock

Required plugins for this example: MBS DynaPDF Plugin, MBS Images Plugin

You find this example project in your Plugins Download as a Xojo project file within the examples folder: /DynaPDF/Raster/DynaPDF Raster to MemoryBlock

This example is the version from Thu, 27th Mar 2019.

Project "DynaPDF Raster to MemoryBlock.xojo_binary_project"
Class App Inherits Application
Const kEditClear = "&Delete"
Const kFileQuit = "&Quit"
Const kFileQuitShortcut = ""
EventHandler Sub NewDocument() dim file as FolderItem if DebugBuild then file = FindFile("license.pdf") end if if file = nil then file = GetOpenFolderItem(FileTypes1.Pdf) end if if file<>nil then OpenDocument file end if End EventHandler
EventHandler Sub OpenDocument(item As FolderItem) dim p as new PDFWindow(item) End EventHandler
Function FindFile(name as string) As FolderItem // Look for file in parent folders from executable on dim parent as FolderItem = app.ExecutableFile.Parent while parent<>Nil dim file as FolderItem = parent.Child(name) if file<>Nil and file.Exists then Return file end if parent = parent.Parent wend End Function
End Class
Class PDFWindow Inherits Window
EventHandler Sub Paint(g As Graphics, areas() As REALbasic.Rect) If pic<>Nil Then // scale down for g.DrawPicture pic, 0, 0, g.Width, g.Height, 0, 0, pic.Width, pic.Height end if End EventHandler
EventHandler Sub Resized() render End EventHandler
EventHandler Sub Resizing() 'render End EventHandler
Sub Constructor(file as FolderItem) // Calling the overridden superclass constructor. Super.Constructor Self.file = file Self.Title = file.DisplayName pdf = New MyDynaPDFMBS PageNumber = 1 call pdf.CreateNewPDF(nil) Call pdf.OpenImportFile(file, 0, "") call pdf.SetImportFlags(pdf.kifImportAsPage + pdf.kifImportAll) // important! It makes the rendering faster. Call pdf.ImportPDFFile(1,1.0,1.0) If pdf.GetPageCount > 0 Then render End If End Sub
Private Sub render() // *2 for higher DPI Dim Width As UInt32 = Self.Width * 2 Dim Height As UInt32 = Self.Height * 2 Dim ScanlineLen As Int32 = Width * 4 Dim PixelFormat As UInt32 = pdf.kpxfBGRA // we render here to memoryblock in case you need pixels in a memoryblock... Dim Buffer As New Memoryblock(height * ScanlineLen) Dim Rasterizer As New DynaPDFRasterizerMBS(pdf, Nil, buffer, width, Height, ScanlineLen, PixelFormat) Dim options As New DynaPDFRasterImageMBS options.DefScale = options.kpsFitBest options.Flags = options.krfCompositeWhite options.InitWhite = True Dim page As DynaPDFPageMBS = pdf.GetPage(PageNumber) If Rasterizer.RenderPage(page, options) Then // we use PictureMBS to display it Dim PP As New PictureMBS(Buffer, Width, Height, PictureMBS.ImageFormatBGRA, ScanlineLen) pic = pp.CopyPicture Else // Failed to render page? pic = Nil End If #if RBVersion < 2013 then self.Refresh(False) #else Self.Invalidate #endif End Sub
Property Private PageNumber As Integer
Property file As FolderItem
Property Private pdf As MyDynaPDFMBS
Property pic As Picture
End Class
MenuBar MenuBar1
MenuItem FileMenu = "&File"
MenuItem FileQuit = "#App.kFileQuit"
MenuItem EditMenu = "&Edit"
MenuItem EditUndo = "&Undo"
MenuItem UntitledMenu1 = "-"
MenuItem EditCut = "Cu&t"
MenuItem EditCopy = "&Copy"
MenuItem EditPaste = "&Paste"
MenuItem EditClear = "#App.kEditClear"
MenuItem UntitledMenu0 = "-"
MenuItem EditSelectAll = "Select &All"
End MenuBar
Filetype application/pdf
End FileTypes1
Class MyDynaPDFMBS Inherits DynaPDFMBS
EventHandler Function Error(ErrorCode as integer, ErrorMessage as string, ErrorType as integer) As integer // output all messages on the console: System.DebugLog str(ErrorCode)+": "+ErrorMessage // and display dialog: Dim d as New MessageDialog //declare the MessageDialog object Dim b as MessageDialogButton //for handling the result d.icon=MessageDialog.GraphicCaution //display warning icon d.ActionButton.Caption="Continue" d.CancelButton.Visible=True //show the Cancel button // a warning or an error? if BitAnd(ErrorType, me.kE_WARNING) = me.kE_WARNING then // if user decided to ignore, we'll ignore if IgnoreWarnings then Return 0 d.Message="A warning occurred while processing your PDF code." // we add a third button to display all warnings d.AlternateActionButton.Caption = "Ignore warnings" d.AlternateActionButton.Visible = true else d.Message="An error occurred while processing your PDF code." end if d.Explanation = str(ErrorCode)+": "+ErrorMessage b=d.ShowModal //display the dialog Select Case b //determine which button was pressed. Case d.ActionButton Return 0 // ignore Case d.AlternateActionButton IgnoreWarnings = true Return 0 // ignore Case d.CancelButton Return -1 // stop End select End EventHandler
Property IgnoreWarnings As Boolean
End Class
End Project

See also:

The items on this page are in the following plugins: MBS DynaPDF Plugin.

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