JME Socket File Transfer - Problem with writing file

Question

Hi everybody, i'm trying to code a P2P app for a school project and i have a problem when trying to write to a file.
This method recieves a file form a Socket Server computer that tries to send me a file to the mobile client.
The method recieves the IP adress (String add) and the port of the server.
Also, i would like to know about the buffer(byte) size.
This codes runs well in emulation, but it doesn`t write to a file.
And the main problem is:
"When i run this in the mobile, the file is created in the cellphone memory with a size of 0kb."
The server code was tested with a computer client and recieved the file succesfully.
The server recieves de socket connection form the cellphone without problem.
public void recibirArch(String add, int port) throws Exception {
try
recibArch.setText("Espere por favor...");
long start = System.currentTimeMillis();
int bytesRead;
int pasos = 12;
int current =0;
SocketConnection sock = (SocketConnection)Connector.open("socket://"+add+":"+port);
byte [] mybytearray = new byte [1024];
InputStream is = sock.openInputStream();
FileConnection fc = (FileConnection) Connector.open("file:///"+saveRoot+"5letras.txt",Connector.READ_WRITE );
if( !fc.exists() ){
fc.create();
} else
fc.truncate(0);
DataOutputStream fos = new DataOutputStream(sock.openOutputStream());
bytesRead = is.read(mybytearray,0,mybytearray.length);
current = bytesRead;
while ((current = is.read(mybytearray)) != -1)
fos.write(mybytearray, 0, current);
fos.flush();
current+=bytesRead;
long end = System.currentTimeMillis();
fos.close();
sock.close()
catch(Exception err)
String error = "ERROR: " + err.toString() + "\nDescripción: "+ err.getMessage();
System.out.println(error);
txtLog.setString(error);
Edited by: xtylo on Sep 30, 2008 10:56 AM

Answer 1

Thank you Tunde for looking at my issues!
The file size is not an issue here. We tested with empty files or files with smaller than 1KB sizes. They all showed problem. The frequency of file transfer shouldn't be a problem either. Through some user interaction on front panel, a couple of files will be transferred. That's basically how often the file transfer occurs.
Interestingly enough, I replaced the copy.vi with a subvi I created using DOS command with System Exec.vi and the issue of copying files went away. My co-worker tested on both XP machine and Windows 7 machine. The DOS command worked fine thru Lavview's System Exec.vi. I think I can take that as a work-around if we can't figured out why copy.vi wouldn't work. Still, it would be nice to know why it doesn't work.
Now I'm still facing some issues with the usage of Check If File or Folder exist.vi. Sometimes it can detect the existing files and sometimes it doesn't.
Thanks very much!