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  1. #1
    Basit781 is offline Member
    Join Date
    May 2010
    Posts
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    Default How to set TextArea after getting it's value from CGI script

    Hi,
    I hope you all will be fine. Actually when user press send command on form2, a method called that get value from CGI script. When i try to set it's value like

    Java Code:
    txtArea2.settext(b.toString());
    i got null pointer exception. If i use System.out.println it worked means the value is printing on console but i want the value comes in txtArea2 on form2. Here is the code

    Java Code:
            form1.addComponent(sms);
            form1.addComponent(internet);
     
    	form1.addCommand(cmdSelect);
    	form1.addCommand(cmdExit);
    
    	form1.addCommandListener(this);
    	form1.setTransitionInAnimator(CommonTransitions.createSlide(CommonTransitions.SLIDE_HORIZONTAL, true, 1000));
    
    	//Setup Form 2
    	form2 = new Form("Form 2");
     
            //set Form layout
    	form2.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
    
            //Create container that holds component and set its layout
    //        Container textBoxContainer = new Container(new BoxLayout(BoxLayout.Y_AXIS));
    
            //create text Area
            txtArea1 = new TextArea("", 2, 10, TextArea.ANY);
            txtArea1.setEditable(true);
            txtArea1.setGrowByContent(true);
            txtArea1.getStyle().setBorder(Border.createLineBorder(2));
            txtArea1.setFocusable(true);
    
              //create text Area2
            txtArea2 = new TextArea(2, 5, TextArea.ANY);
            txtArea2.setEditable(false);
           
    	form2.addCommand(cmdSend);
    	form2.addCommand(cmdBack);
    
    	form2.addCommandListener(this);
    
            form2.addComponent(txtArea1);
            form2.addComponent(txtArea2);
    
    	form2.setTransitionInAnimator(Transition3D.createCube(1000, true));
    	form1.show();
        }
         
         public void actionPerformed(ActionEvent evt) {
    
            if ((sms.isEnabled()) && (sms.hasFocus()) ){
                form2.show();
            }
    		//check which command cliked
    		if (evt.getCommand()==cmdExit) {
    			notifyDestroyed();
                    //} else if (evt.getCommand()==cmdSelect) {
                   //} else if ( (sms.isEnabled()) || (((evt.getCommand()==cmdSelect) && (sms.hasFocus()))) ) {
    	       } else if ((((evt.getCommand()==cmdSelect) && (sms.hasFocus()))) ) {
    			form2.show();
    
    
    		} else if (evt.getCommand()==cmdBack) {
    			form1.show();
    		} else if (evt.getCommand()==cmdSend) {
                        //form2.setFocusable(true);
                        String text = txtArea1.getText();
                        System.out.println("txtArea1 contain this text: " + text);
    
                        try{
                            //new SendDataToCGI().getData();
                            getGrade("http://10.120.10.24/cgi-bin/http.cgi?cmd=baasit");
                        } catch(IOException e){
                            e.printStackTrace();
                        }
                       
    
    
                    }
        }
    
          void getGrade(String url) throws IOException {
          HttpConnection c = null;
          InputStream is = null;
          OutputStream os = null;
          StringBuffer b = new StringBuffer();
          //TextBox t = null;
          try {
             c = (HttpConnection)Connector.open(url);
             c.setRequestMethod(HttpConnection.GET);
             c.setRequestProperty("CONTENT-TYPE","application/x-www-form-urlencoded");
             c.setRequestProperty("User-Agent","Profile/MIDP-1.0 Confirguration/CLDC-1.0");
             c.setRequestProperty("Content-Language", "en-CA");
             os = c.openOutputStream();
    
             // send input
             String str = "name=182016";
             byte postmsg[] = str.getBytes();
             for(int i=0;i<postmsg.length;i++) {
                os.write(postmsg[i]);
             }
             os.flush();
             is = c.openDataInputStream();
             int ch;
             // receive output
             while ((ch = is.read()) != -1) {
                b.append((char) ch);
                System.out.println((char)ch);
             }
    
             System.out.println("after while loo: " + b.toString());
             txtArea2.setText("Hi am good");
             //form2.addComponent(new Label(b.toString()));
             //form2.show();
            // t = new TextBox("Final Grades", b.toString(), 1024, 0);
            // form2.addComponent(t);
          } finally {
             if(is!= null) {
                is.close();
             }
             if(os != null) {
                os.close();
             }
             if(c != null) {
                c.close();
             }
          }
         // form2.show();
          //display.setCurrent(t);
       }
    Here is the exception

    Java Code:
    I am in ChooseOptions2
    a
    t
    i
    f
     
    r
    e
    h
    m
    a
    n
    after while loo: atif rehman
    TRACE: <at java.lang.NullPointerException:   0>, startApp threw an Exception
    java.lang.NullPointerException:   0
            at ChooseOptions2.getGrade(ChooseOptions2.java:371)
            at ChooseOptions2.startApp(ChooseOptions2.java:63)
            at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(), bci=1
            at com.sun.midp.midlet.MIDletPeer.startApp(), bci=7
            at com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=269
            at com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
            at com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
            at com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
            at com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26
    java.lang.NullPointerException:   0
            at ChooseOptions2.getGrade(ChooseOptions2.java:371)
            at ChooseOptions2.startApp(ChooseOptions2.java:63)
            at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(), bci=1
            at com.sun.midp.midlet.MIDletPeer.startApp(), bci=7
            at com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=269
            at com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
            at com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
            at com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
            at com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26
    when i use System.out.println, the code works fine but form1 is shown after code runs. I want that form2 remain there and value is shown in txtArea2.
    How can i do this please guide me

    Thanks

  2. #2
    Basit781 is offline Member
    Join Date
    May 2010
    Posts
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    Thumbs up

    Hey sorry i sort out the problem actually i calling it from two places that's why i was getting null.

    Thanks

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