Load a PDF from a stream in C# .NET

To load a PDF document from a previously instantiated stream, use the LoadFromStream method from the GdPicturePDF class.

LoadFromStream accepts:

  • A Stream parameter (required).
  • An optional OwnStream Boolean parameter (default: false).

When OwnStream is:

  • false — You’re responsible for disposing the stream.
  • true — GdPicturePDF will dispose the stream when it’s no longer needed (for example, after CloseDocument).

LoadFromStream only supports PDF input and returns a GdPictureStatus, which should always be checked.

You can also load a PDF from a COM IStream by using the LoadFromIStream method.

To load a PDF document from a stream, use the following code:

using GdPicture14;
using System;
using System.IO;


// OwnStream = false (default): caller disposes the stream.
using (Stream streamPdf = new FileStream(@"C:\temp\source.pdf", FileMode.Open, FileAccess.Read))
using (GdPicturePDF pdf = new GdPicturePDF())
{
    GdPictureStatus status = pdf.LoadFromStream(streamPdf);
    if (status != GdPictureStatus.OK)
    {
        Console.WriteLine($"LoadFromStream failed: {status}");
        return;
    }


    pdf.CloseDocument();
}


// OwnStream = true: GdPicturePDF owns the stream lifecycle.
using (GdPicturePDF pdf = new GdPicturePDF())
{
    Stream streamPdf = new FileStream(@"C:\temp\source.pdf", FileMode.Open, FileAccess.Read);


    GdPictureStatus status = pdf.LoadFromStream(streamPdf, true);
    if (status != GdPictureStatus.OK)
    {
        Console.WriteLine($"LoadFromStream failed: {status}");
        return;
    }


    // Closing the document also releases owned stream resources.
    pdf.CloseDocument();
}