XSTRING with Binary of PDF - display R3 report in portal

Hello,
We have a requirement to show an R/3 report on portal as PDF. User will then be able to Print/Save the same.
I have browsed through different posts on SDN and
The idea I have is:
1. Print the report to spool (Backend).
2. Convert the spool to pdf (Backend).
3. Create a FM (in the backend) that exports an xstring with the binary of the pdf (of the report)
4. Using webdynpro for Java, create pdf form based on binary xstring.
5. Render the pdf to portal and display it in portal.
I have a couple of questions regarding this approach:
1. What exactly does the function module needs to export (what format and type should be used)?
2. How should the data being sent from the backend be handled in the Webdynpro Code? (What Context attribute should be created and what type should be used?)
Please share your experience if some one had developed a similar application. Any sample code would be really appreciated.
Thanks for Reading the post and for your time.
Regards,
Raj

Hi Raj,
Thanks for the link, i followed the procedure the way it mentioned in the link, but i am getting the below error as nullpointer exception, i checked everything but still i am getting the error.
i can see one thing in webdynpro java code , i am getting warning message for this " wdwebresource"
as deprecaiated, what is this meant?
thanks,
vinay
java.lang.NullPointerException
     at com.vin.view.PdfView.wdDoInit(PdfView.java:115)
     at com.vin.view.wdp.InternalPdfView.wdDoInit(InternalPdfView.java:137)
     at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doInit(DelegatingView.java:61)
     at com.sap.tc.webdynpro.progmodel.controller.Controller.initController(Controller.java:215)
     at com.sap.tc.webdynpro.progmodel.view.View.initController(View.java:445)
     at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:709)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.bindRoot(ViewManager.java:579)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.init(ViewManager.java:155)
     at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.doOpen(WebDynproWindow.java:295)
     at com.sap.tc.webdynpro.clientserver.window.ApplicationWindow.show(ApplicationWindow.java:183)
     at com.sap.tc.webdynpro.clientserver.window.ApplicationWindow.open(ApplicationWindow.java:178)
     at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:364)
     at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.initApplication(ApplicationSession.java:756)
     at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:291)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:713)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
     at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:46)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(AccessController.java:207)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)

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