Understanding the newspaper of the device: TXch & TXun

Hello

I use a FTP connection to send compressed text files.

I have a big problem with the file of more than 40K.

Basically, the process is:

-generate a string with data;

-Compress using something similar to GZipOutputStream sample;

-connect to the FTP server using the socket connection

-Send it

the send code is something like this:

OutputStream output = dataSocket.openOutputStream();
byte[] buffer = new byte[512];
int bytesRead = 0;

while ((bytesRead = inputStream.read(buffer)) != -1) {
    output.write(buffer, 0, bytesRead);
}
output.flush();
output.close();
output = null;
dataSocket.close();
dataSocket=null;

All good work with less than 40K file, but more are send corrupt.

I try to open it on the FTP server and the error message is unexpected end of file.

Try on the device, I see that there is a strange warning in the event log:

E net.rim.tcp - TXch

E net.rim.tcp - TXun

... repeated several times

Any idea?

To solve it I try split the file into 40K file, but I don't like so much.

Thanks for the help!

There are limits to how much you can send in a single connection with the connections on a BlackBerry (no WiFi) wireless data.  These limits depend on several factors, including the type of file (for example by using a browser, you can download large mp3 files).

You can find more information here:

http://supportforums.BlackBerry.com/T5/Java-development/HTTP-413-request-entity-too-large/Ta-p/44598...

In this case, the Administration does not know what type of file you download.  In addition, I've seen comments from people downloading compressed files, it seems that these be unpacked in terms of count bytes (possible, since the MDS probably thinks he can get better compression than gzip).  Your magic number of 40K also referred to in some messages, take a look here:

http://supportforums.BlackBerry.com/T5/Java-development/maximum-chunk-to-read-data-from-input-stream...

In any case, I have tsuspect the short answer is that it is unlikely that you will be able to transfer a large file in a single block, using ftp.  I think you need to chunk it upward.

Alternatively, you can watch the ftp protocol more complicated which involves blocking.  This will depend on your ftp server.

Tags: BlackBerry Developers

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