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Editorial Team
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Asked: 2026-06-05T12:55:49+00:00

I am trying to implement signature capture using Rhodes targeting an Android tab. I

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I am trying to implement signature capture using Rhodes targeting an Android tab. I have managed to get the canvas and scribble on it. But am unable to save the signature at a desired location. The signature_uri takes the default location as db/db-files/Image-XXXXXX.png.

This was the code in the sample example:

def signature_callback
if @params['status'] == 'ok'
  #create signature record in the DB
  signature = SignatureUtil.new({'signature_uri'=>@params['signature_uri']})
  signature.save
  puts "new Signature object: " + signature.inspect
end

In the console I got:

APP| RHO serve: /app/Settings/signature_callback
I/APP     (  801): I 01/26/2012 11:36:20:236 0000032e                  APP| Params: {"status"=>"ok", "signature_uri"=>"db/db-files/Image_20120126113618375.png", "rho_callback"=>"1"}
I/APP     (  801): I 01/26/2012 11:36:20:238 0000032e                  APP| *******************ok****************
I/APP     (  801): I 01/26/2012 11:36:20:238 0000032e                  APP| %%%%%%%%%%%%%%%%%db/db-files/Image_20120126113618375.png%%%%%%%%%%%
I/APP     (  801): I 01/26/2012 11:36:20:239 0000032e                  APP| App error: can't convert Symbol into Integer
I/APP     (  801):  lib/rhom/rhom_object_factory.rb:67:in `[]'
I/APP     (  801): lib/rhom/rhom_object_factory.rb:67:in `initialize'
I/APP     (  801): apps/app/Settings/controller.rb:34:in `new'
I/APP     (  801): apps/app/Settings/controller.rb:34:in `signature_callback'
I/APP     (  801): lib/rho/rhocontroller.rb:91:in `serve'
I/APP     (  801): lib/rho/rhoapplication.rb:209:in `serve'
I/APP     (  801): lib/rho/rho.rb:822:in `serve'
I/APP     (  801): E 01/26/2012 11:36:20:248 00000321                  Net| Request failed. HTTP Code: 500 returned. HTTP Response:         <html>
I/APP     (  801):             <head>
I/APP     (  801):                 <meta name="viewport" content="width=320"/>
I/APP     (  801):             </head>
I/APP     (  801):             <body>
I/APP     (  801):                 <h2>Server Error</h2>
I/APP     (  801):                 <p>
I/APP     (  801): Error: can't convert Symbol into Integer<br/>Trace: <br/

Now instead of this database storage, I want to save it in a desired location. Please share your views.

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1 Answer

  1. Editorial Team

    have you checked out this page: http://docs.rhomobile.com/rhodes/device-caps#file-system-access ? It looks to me like you need to save the image to the DB and use the Rho::RhoApplication::get_blob_path(image.image_uri) method to open the file. Then you should be able to use the file system API to create a new file and write the contents of the image to it wherever you choose.

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