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Show Image from Server on Browsers Canvas [message #1803303]

Tue, 26 February 2019 14:55

Nin Pa

Messages: 36
Registered: September 2013

Member

Hello!
I am trying to show an Image from the server in a canvas, that is contained in a swt browser.
I just finished doing it the other way, saving the image from the canvas on the server using

String script += "return canvas.toDataURL('image/png');";
String dataURL = (String) browser.evaluate(script);
byte[] imagedata = DatatypeConverter.parseBase64Binary(dataURL.substring(dataURL.indexOf(",") + 1));
			BufferedImage bufferedImage = ImageIO.read(new ByteArrayInputStream(imagedata));
			ImageIO.write(bufferedImage, "png", new File(imgFilePath));

Is there a way doing it the other way round? Sending an image from java to the canvas?

Would be great, if there is a solution for my problem...
Greetings!

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Re: Show Image from Server on Browsers Canvas [message #1803308 is a reply to message #1803303]

Tue, 26 February 2019 15:31

Vincenzo Caselli

Messages: 235
Registered: January 2012

Senior Member

Hi Nin Pa,
you can define a Servlet in RAP (via "org.eclipse.equinox.http.registry.servlets" Extension Point), implement it reading a stream on the server file system and rendering it on the response.
Then the SWT Browser can point to the servlet URL (e.g. "/doc?id=378") so to make the document or image visible to the user.
HTH
Vincenzo Caselli
RCP Vision

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Re: Show Image from Server on Browsers Canvas [message #1803327 is a reply to message #1803308]

Tue, 26 February 2019 21:49

Chris Fairhall

Messages: 221
Registered: February 2011

Senior Member

Alternatively you can create a ServiceHandler to deliver files to the client.
https://www.eclipse.org/rap/developers-guide/devguide.php?topic=resources.html&version=3.7

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Re: Show Image from Server on Browsers Canvas [message #1803599 is a reply to message #1803327]

Tue, 05 March 2019 09:26

Nin Pa

Messages: 36
Registered: September 2013

Member

Thank you very much!
It worked for me using the ResourceManager and register the image, than getting the URL with RWT.getResourceManager().getLocation(imgName) and pointing to it in the img.src :)

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