How to do file operations in BlackBerry
Code to read data from a file
byte[] fulldata = null; //Assign the name of the file to read the contents with full path String filename = "/store/home/user/pictures/test.txt"; if (filename != null) { FileConnection file = (FileConnection) Connector.open("file://" +filename, Connector.READ); //Get the file size int fileSize = (int) file.fileSize(); if (fileSize > 0) { fulldata = new byte[fileSize]; InputStream input = file.openInputStream(); try{ input.read(fulldata); } catch(Exception sfg){ System.out.println(sfg.toString()); } input.close(); } file.close(); }
Code to write data to a file
This function allows you to write byte array to the file specified.
//data -> byte array (Original data to be written) //filename -> name of the file in which those data has to be written public static void writeFileData(byte[] data, String filename) { FileConnection file = null; OutputStream out = null; try { file = (FileConnection) Connector.open("file:///store/home/user/pictures/" + filename, Connector.READ_WRITE); if (file.exists()) file.delete(); file.create(); out = file.openOutputStream(); out.write(data); } catch (IOException e) { System.out.println("Problem in writeFile : " + e.toString()); } finally { try { if (out != null) { out.close(); } if (file != null && file.exists()) { if (file.isOpen()) { file.close(); } } } catch (IOException ioe) { System.out.println("Error while closing file: " + ioe); } } }//fn writeFileData
Code to delete a file
String filename = "/store/home/user/pictures/test.txt"; FileConnection file = null; try { file = (FileConnection) Connector.open("file://" + filename, Connector.READ_WRITE); } catch (IOException e) { System.out.println("Error in file connection : "+e.toString()); } finally { try { if (file != null && file.exists()) { file.delete(); } } catch (IOException ioe) { System.out.println("Error in file deletion : "+ioe.toString()); } }