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Issue with accessing stream length
https://forum.pdfsharp.net/viewtopic.php?f=2&t=1380		 Page 1 of 1
Author:  andles [ Wed Oct 20, 2010 9:14 am ]
Post subject:  Issue with accessing stream length
Hi All,

I want to set the stream length for an RTF doc being output over the web, but due to the way the stream is handled in the render method (I think?) I am forced to omit this. Is this a bug??


// Create a renderer for the MigraDoc document.
RtfDocumentRenderer rtfRenderer = new RtfDocumentRenderer();

// Send to browser
MemoryStream stream = new MemoryStream();

// Do these now, or will have issues with closed stream!
Response.Clear();
Response.ContentType = "application/msword"; // text/rtf?

// Associate the MigraDoc document with a renderer
rtfRenderer.Render(migraDoc, stream, null);

PROBLEM HERE! ACCESSING STREAM LENGTH CAUSES 'cannot access closed stream' - COMMENTING IT OUT SOLVES THE
PROBLEM, BUT IDEALLY THE BROWSER WANTS TO KNOW THE FILE SIZE.

// Response.AddHeader("content-length", stream.Length.ToString());
Response.BinaryWrite(stream.ToArray());
Response.Flush();
stream.Close();
Response.End();

Any thoughts, ideas on this??

Cheers,
Andles...
Author:  Thomas Hoevel [ Wed Oct 20, 2010 9:26 am ]
Post subject:  Re: Issue with accessing stream length
Something like this:
Code:
var bytes = stream.ToArray();
Response.AddHeader("content-length", bytes.Length.ToString());
Response.BinaryWrite(bytes);

(Just an idea and completely untested)
Author:  andles [ Wed Oct 20, 2010 10:44 am ]
Post subject:  Re: Issue with accessing stream length
Excellent - that did the trick!

I assumed that the render method was closing the stream - but possibly it is the ToArray() call that alters the state of the stream? Either way - many thanks, problem solved.

Here's my final code in case others encounter this when using memory stream and/or outputting RTF to a web browser:


private void RenderAsRTF(Document migraDoc)
{
// Create a renderer for the MigraDoc document.
RtfDocumentRenderer rtfRenderer = new RtfDocumentRenderer();

// Send to browser
MemoryStream stream = new MemoryStream();

// Do these now, or will have issues with closed stream!
Response.Clear();
Response.ContentType = "application/msword"; // text/rtf?

// Associate the MigraDoc document with a renderer

rtfRenderer.Render(migraDoc, stream, null);
byte[] bytes = stream.ToArray();
Response.AddHeader("content-length", bytes.Length.ToString());
Response.BinaryWrite(bytes);
Response.Flush();
stream.Close();
Response.End();

}
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