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FTPClient.listFiles() is not working..

 
Greenhorn
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hey guys..

i am writing an application which uploads file to FTPServer.

in which i need to check whether a file exist on FTPServer or not , if yes then append new data to that file else create new file.

first time it creates new file successfully.to check whether file already exists on server i am using this code..

FTPClient client = new FTpClient();

final String _cwdFTP = client.printWorkingDirectory();
final FTPFile[] list = client.listFiles(_cwdFTP);

but list always comes null and this happens when i am connected through WIRELESS CONNECTION. but same code works fine when i am connected through LAN CABLE.

please help me to solve this problem.

Thanks

Regards
Tapan Thakkar.
 
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