Java Development

[saravanakumaran]

Dear Friends,

          I want to know how to write content in file. example:I am having one basic edit field and one save button if click the save button then it should write the content of basiceditfield into one text file and i can able to retrive that file in later.Can any one tell me how to do ? If u can provide me some code snippet.

regards,

s.kumaran.

[BBDeveloper]

Check the following code snippet to write a file...

FileConnection fc = (FileConnection)
Connector.open(System.getProperty("file:///SDCard/"+"test.txt"),Connector.READ_WRITE);
if(!fc.exists())
  fc.create();
  OutputStream os =fc.openOutputStream();
  os.write(yourfield.getText());
  os.close(); 
  fc.close(); 

You can make use of read methods to read teh File content..

[BBDeveloper]

Check this thread for reading...

http://supportforums.blackberry.com/rim/board/message?board.id=java_dev&message.id=2362&query.id=224...

[saravanakumaran]

thanks for ur immediate response and in ur reply "file:///SDCard/" this location refers to where? and  if it refers SDCard in blackberry means how to make it in simulator 9000.

[BBDeveloper]

Check this KB article.

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800738/800792/801083/...

[saravanakumaran]

Hi i have read and tried the article but still i m having some problem.

In my system's " E: " i created one flolder with the name " SDCard "and i have specify this location ("E:\SDCard") at PCFilesystem path for SDCard files in the prefrence window  then i click ok.After that i can see one folder inside that SDCard folder with the name of blackberry and inside the blackberry folder i can see six folders with name of documents,music,picture,ringtones,videos,and voice chats.I created a file "test.txt" inside the Document folder and i specify the path as ("E:/SDCard/BlackBerry/Documents/"+"test.txt") in the FileConnection even i can get a error can u pls what i m doing wrong.

[BBDeveloper]

In your FileConnection, you have to mention file:///SDCard/... not e:/SDCard/...

[saravanakumaran]

i have tried all the following ya still i m getting null url exception ,

1) FileConnection fc=(FileConnection)Connector.open(System.getProperty("file:///SDCard/BlackBerry/documen/"+"test.txt"),Connector.READ_WRITE);

2)  FileConnection fc=(FileConnection)Connector.open(System.getProperty("file:E:/SDCard/BlackBerry/documents/"+"test.txt"),Connector.READ_WRITE);

3)FileConnection fc=(FileConnection)Connector.open(System.getProperty("file:/SDCard/BlackBerry/documents/"+"test.txt"),Connector.READ_WRITE);

[BBDeveloper]

Try this..

FileConnection fc = (FileConnection)Connector.open("file:///SDCard/BlackBerry/documents/"+"text.txt",Connector.READ_WRITE);

[saravanakumaran]

Hey thanks ya.Now file is creating ya but contents are not written in the file ya.

i try to write a stirng driectly in os.write(stringvalue) but it show the error then i refer the api then we can only able to write only byte and int so i convert my string in one byte array then i write into file using for loop but no content is writing ya.here is the part of the code which i have used.

 OutputStream os =fc.openOutputStream();
            byte[] barr=new byte[stringvalue.length()];
            for(int i=0;i<stringvalue.length();i++)
            {  
                barr[i]=(byte)s.charAt(i);
            }
            //os.write(yourfield.getText());
           for(int i=0;i<barr.length;i++)
           {
            os.write(barr[i]);
           }