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/DynaPDF/Extract images
Function:
Required plugins for this example: MBS DynaPDF Plugin, MBS Util Plugin, MBS Picture Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /DynaPDF/Extract images
This example is the version from Sun, 6th Mar 2021.
Function:
Required plugins for this example: MBS DynaPDF Plugin, MBS Util Plugin, MBS Picture Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /DynaPDF/Extract images
This example is the version from Sun, 6th Mar 2021.
Project "Extract images.xojo_binary_project"
Class App Inherits Application
Const kEditClear = "&Delete"
Const kFileQuit = "&Quit"
Const kFileQuitShortcut = ""
EventHandler Sub Open()
Dim f As FolderItem = GetOpenFolderItem(MyFileTypes.Pdf)
if f=nil then
quit
end if
dim p as new MyDynapdfMBS
p.SetLicenseKey "Pro" // For this example you can use a Pro or Enterprise License
call p.CreateNewPDF(nil)
// Skip anything that is not required
call p.SetImportFlags p.kifContentOnly+p.kifImportAsPage
// From which PDF file do you want to extract the images?
call p.OpenImportFile(f, p.kptOpen, "")
// Comment this out if you want to extract the images from specific pages only
call p.ImportPDFFile(1, 1.0, 1.0)
// Uncomment this section if you want to extract images from specific pages only
'dim pageCount as integer = p.GetInPageCount
'for i as integer = 1 to pageCount
' call p.ImportPDFPage(i)
'next
call p.CloseImportFile
dim stack as new MyDynaPDFParseInterfaceMBS
stack.dest=SpecialFolder.desktop // destination folder
stack.pdf=p
'If you want to create a multipage TIFF then create the output image here
'and call AddImage() only in the callback function. After the loop
'returns call CloseImage() to close the image file.
//CreateImage(f, p.kifmTIFF);
dim pageCount as integer = p.GetPageCount
for i as integer=1 to pageCount
call p.EditPage i
'If you want to convert the images into a specific color space then set
'one of the folowing flags (see also TParseFlags in dynapdf.h):
'
'p.kpfDitherImagesToBW // Floyd-Steinberg dithering.
'p.kpfConvImagesToGray
'p.kpfConvImagesToRGB
'p.kpfConvImagesToCMYK
'
'Only one color space conversion flag must be set at time.
call p.ParseContent(stack, p.kpfDecomprAllImages)
call p.EndPage
next
// p.CloseImage // Call this function here if you create a multipage TIFF.
End EventHandler
End Class
Class Window1 Inherits Window
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
Class MyDynaPDFParseInterfaceMBS Inherits DynaPDFParseInterfaceMBS
EventHandler Function BeginTemplate(ObjectPtr as integer, Handle as integer, BBox as DynaPDFRectMBS, Matrix as DynaPDFMatrixMBS) As integer
System.DebugLog "Begin Template"
End EventHandler
EventHandler Function InsertImage(image as DynaPDFImageMBS) As integer
Dim ImageFile As FolderItem = ProcessImage(image)
Dim MaskFile As FolderItem
// check if we have soft mask to extract:
If image.ISoftMaskHandle >= 0 Then
Dim img As DynaPDFImageMBS = pdf.GetImageObj(image.ISoftMaskHandle, pdf.kpfDecomprAllImages)
If img <> Nil Then
MaskFile = ProcessImage(img)
end if
End If
// check if we have mask to extract:
If image.IMaskImageHandle >= 0 Then
Dim img As DynaPDFImageMBS = pdf.GetImageObj(image.IMaskImageHandle, pdf.kpfDecomprAllImages)
If img <> Nil Then
MaskFile = ProcessImage(img)
End If
End If
If MaskFile <> Nil And ImageFile <> Nil Then
// let's try to apply mask
Dim pic As Picture = Picture.Open(ImageFile)
Dim mask As Picture = Picture.Open(MaskFile)
If pic <> Nil And mask <> Nil Then
mask = mask.InvertMBS
// combine picture and mask
Dim newPicture As New Picture(pic.Width, pic.Height, 32)
newPicture.Graphics.DrawPicture pic, 0, 0, pic.Width, pic.Height, 0, 0, pic.Width, pic.Height
newPicture.mask.Graphics.DrawPicture mask, 0, 0, pic.Width, pic.Height, 0, 0, mask.Width, mask.Height
// save it
Dim FileName As String = ImageFile.NameWithoutExtensionMBS + ".png"
Dim File As FolderItem = ImageFile.Parent.Child(FileName)
newPicture.Save(File, newPicture.SaveAsPNG, newPicture.QualityHigh)
End If
End If
End EventHandler
Function ProcessImage(Image as DynaPDFImageMBS) As FolderItem
Dim b As BinaryStream
Dim f As FolderItem
System.DebugLog "Insert Image"
counter = counter + 1
Select Case Image.filter
Case DynapdfMBS.kdfDCTDecode // JPEG
f=dest.Child(Str(Counter)+".jpg")
b=f.CreateBinaryFile("")
If b<>Nil Then
b.Write image.Buffer
b.Close
Return f
End If
Case DynapdfMBS.kdfJPXDecode // JPEG 2000
f=dest.Child(Str(Counter)+".jp2")
b=f.CreateBinaryFile("")
If b<>Nil Then
b.Write image.Buffer
b.Close
Return f
End If
Else // anything else
f=dest.Child(Str(Counter)+".tif")
If pdf.CreateImage(f, pdf.kifmTIFF) Then
Call pdf.addimage(pdf.kcfLZW, pdf.kicNone, image)
Call pdf.CloseImage
Return f
End If
End Select
End Function
Property Counter As Integer
Property dest As folderitem
Property pdf As dynaPDFmbs
End Class
MyFileTypes
Filetype application/pdf
End MyFileTypes
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.
