Java Development

[hades_6]

Hi guys, I'm using the 4.6.1 JDE. I want to store a downloaded image on the file system and retrieve it later. Something like a caching option. Everything works perfectly on the simulator but when I install on the device it doesn't work. Here's the code,

private StringBuffer Imagedirectory = new StringBuffer(System.getProperty("fileconn.dir.photos"));



FileConnection fc = (FileConnection)Connector.open(Imagedirectory.toString(),Connector.READ_WRITE);
                                
                if(!fc.exists()){
                    Util.getWebData(url, this);
                }else{            
                    
                    byte[] data = getData(fc);
                    
                    bitmap = EncodedImage.createEncodedImage(data, 0,  
                            data.length);
                    
                    if(this.width !=0 && this.height !=0){    
                        bitmap = ScaleImageToSize(bitmap, this.width,this.height);
                    }
                    setImage(bitmap);
 }

this is where I get the data from the file,

private byte[] getData(FileConnection file)
    {        
        byte[] data = new byte[0];
        try
        {           
        	 InputStream input = file.openInputStream();
                          //////////
             int SIZE = 100000;
             ByteArrayOutputStream byteArrayOutputStream = new 
                                ByteArrayOutputStream();
             byte[] buffer = new byte[SIZE];
             while (true) 
             {
               int bytesRead = input.read( buffer, 0, SIZE );
               if (bytesRead == -1) break;
               byteArrayOutputStream.write( buffer, 0, bytesRead );
             }
             data = byteArrayOutputStream.toByteArray();
             byteArrayOutputStream.flush();
             byteArrayOutputStream.close();

            
        }
        catch(Exception e)
        {
            System.out.println(e.toString());            
        }         
        return data;
		
    }  

 this is where I write the image to a file,

private void writeFile(byte[] data, String fileName) 
	{
		FileConnection fconn = null; 
		try {
			fconn = (FileConnection) Connector.open(fileName,
					Connector.READ_WRITE);
		} catch (IOException e) {
			System.out.print("Error opening file");
		}

		if (fconn.exists())
			try {
				fconn.delete();
			} catch (IOException e) {
				System.out.print("Error deleting file");
			}
			try {
				fconn.create();
			} catch (IOException e) {
				System.out.print("Error creating file");
			}
			OutputStream out = null;
			
			try {
				out = fconn.openOutputStream();
			} catch (IOException e) {
				System.out.print("Error opening output stream");
			}

			try {
				out.write(data);
				out.flush();
			} catch (IOException e) {
				System.out.print("Error writing to output stream");
			}

			try {
				fconn.close();
			} catch (IOException e) {
				System.out.print("Error closing file");
			}
	}

Please help.

[rcmaniac25]

Are you getting an exception (or the println output specifying and error) or does everything run perfect and you just can't find the file?

[peter_strange]

And what doesn't work?

[hades_6 · Accepted solution]

Thank you so much for replying.

I found the problem, the byte array which I was parsing was not proper, so I first created the image and after that used the  byte information from that to save the image. Here's the solution.

	public void callback(final String data)  
	{  
		if (data.startsWith("Exception")) return;  

		try  
		{ 
			
			byte[] dataArray = data.getBytes();
			bitmap = EncodedImage.createEncodedImage(dataArray, 0,  
					dataArray.length);
			
			if(this.width !=0 && this.height !=0){	
				bitmap = ScaleImageToSize(bitmap, this.width,this.height);
			}
			setImage(bitmap);			
			
			if(isWriteImage()){
				
				System.out.println("Before writing the image");
				writeFile(bitmap.getData(), Imagedirectory.toString());
				System.out.println(Imagedirectory);			
				System.out.println("Image written - Operation Successful");
			}
			
		}  
		catch (final Exception e){
			System.out.println("Image Creation Failed");			
		}  
	}  

The problem was because I was parsing the byte array from the string variable data. Any idea why this caused an issue?