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Type Conversion

PDFTron type conversion allows you to call C functions directly from C#.

Managed type and binding types

PDFTron for Xamarin SDK takes advantage of PInvoke which allows calling C functions from C# directly. This applies to all core classes that are shared between Xamarin.Android and Xamarin.iOS. However, the PDFViewCtrl class and PDFViewCtrlTools library are direct Xamarin bindings from the source code. This article will walk you through how to deal with managed type and binding types.

Key concepts:

  • All managed types are in pdftron namespace
  • All binding types are in pdftronprivate namespace

A TypeConvertHelper class is provided to convert between managed types and binding types. For example:

linkPDFDoc

From pdftronprivate.PDF.PDFDoc to pdftron.PDF.PDFDoc:

var pdfDoc = TypeConvertHelper.ConvPdfDocToManaged(privatePdfDoc);

From pdftron.PDF.PDFDoc to pdftronprivate.PDF.PDFDoc:

var privatePdfDoc = TypeConvertHelper.ConvPDFDocToNative(pdfDoc);

linkAnnot

From pdftronprivate.PDF.Annot to pdftron.PDF.Annot:

var annot = TypeConvertHelper.ConvAnnotToManaged(privateAnnot);

From pdftron.PDF.Annot to pdftronprivate.PDF.Annot:

var privateAnnot = TypeConvertHelper.ConvAnnotToNative(annot);

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