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jstraylor
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Saving & Copying images
Jan 23rd, 2008 at 1:41pm
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Good day,

We are still using FC.Net 4.3.1 and are having a problem with images applied to boxes.  In some cases we have a need to copy our current flowchart to a new flowchart for printing and archiving purposes.

We use (somthing like) newFC.fromstring(oldFC.tostring())  (I can't recall the exact syntax, but that should convey the essence)

Images attached to boxes in the oldFC are not showing up in the newFC.

BTW, this does not seem to happen if the attached image comes from the app.resources.  (specifically a GIF or an ICO)


Any ideas or suggestions would be welcome,
Jeff
  
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Stoyo
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Re: Saving & Copying images
Reply #1 - Jan 23rd, 2008 at 1:49pm
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Good day,

That happens if you load a node image from a stream and close the stream before calling FlowChart.Save(). You can see a "You must keep the stream open for the lifetime of the Image" remark in the MSDN article for Image.FromStream. If the original image stream is closed, the Image.Save() method fails when Flowchart.NET calls it while serializing the chart.

Stoyan
  
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Bjorn
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Re: Saving & Copying images
Reply #2 - Sep 30th, 2011 at 6:20pm
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Thank you for the reply.  We have images that are application resources that are causing this issue as well as ones that are loaded from stream.  It also seems to happen with various image formats.
  
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Stoyo
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Re: Saving & Copying images
Reply #3 - Sep 30th, 2011 at 7:22pm
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Actually we fixed this specific issue a few years ago (Image.Save not working if the original stream was closed), by reencoding the image as Bmp if saving its original bytes fails. Later we noticed the transparent background is lost, as per your previous post, and started reencoding to Png when saving to binary format, but it seems we have omitted doing this for Xml. Our developer will update the xml code in the next few days. Until then, you could try to keep the resource stream open, and the images will be saved in their original format along with any transparency.

Stoyan
  
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Stoyo
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Re: Saving & Copying images
Reply #4 - Oct 3rd, 2011 at 7:40am
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You can find updated version of the control on the PM page. It now encodes images as PNG when the original bytes are not available (after the original image stream is closed) so the transparency should be preserved.

I hope that helps,
Stoyan
  
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