General

[nuekiseki]

Exception

Message: A null value was found where an object instance was required.
Source: System

Stack Trace:
at (wrapper delegate-end-invoke) <Module>:end_invoke_int__this___IAsyncResult (System.IAsyncResult)
at System.Net.FtpDataStream.EndRead (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at System.Net.FtpDataStream.Read (System.Byte[] buffer, Int32 offset, Int32 size) [0x00000] in <filename unknown>:0
at System.IO.Stream.CopyTo (System.IO.Stream destination, Int32 bufferSize) [0x00000] in <filename unknown>:0

=============================================================================

is it a bug ? i'm confused.. what's exactly happened ? it's happen everytime i downloading a large file > 100mb on PSVita (not simulator).. midway FTP response stream throws unknown exception  

EDIT: is GC faulty ? it seems GC collect Stream object earlier than expected...

EDIT2: i'm not so adept in C# so i dunno how GC works

EDIT3: GC.KeepAlive() no effect  

[ProfessorOhki]

See : http://community.eu.playstation.com/t5/General/96MB-memory-for-apps/td-p/15898599

96 MB of space for an app, so your FTP functions are probably seeing full flash.

Edit: That thread was talking about RAM, but I bet it's either related or flash has its own cap. At exactly what size file does it present this behavior?

[nuekiseki]

any size.. and besides i'm not copying all the file from server's content to memory.. i'm using 64K buffer.. and writing it to the file.. 

it's still throw exception even when im using read and write not copyto

EDIT: BTW it's inside BackgroundWorker DoWork procedure

here's the snippet:

CopyTo version:

FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
FileStream fs = new FileStream(local_path,FileMode.Create);

responseStream.CopyTo(fs,65536);

Read Write Version:

FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
FileStream fs = new FileStream(local_path,FileMode.Create);

byte[] buff = new byte[65536];

while((readed = responseStream.Read(buff,0,65536)) > 0){
fs.Write(buff,0,readed);
}

[nuekiseki · Accepted solution]

i started the wireshark and found out that PSVita FtpWebRequest and FtpWebResponse only sending request not getting any response code from server and while transfering file after sometime post QUIT command ???? it's weird.... while on PS Suite Simulator FtpWebRequest and FtpWebResponse behaving correctly... It seems bug on PSVita Mono Implementation..

SOLUTION: fix the bugs.. another solution create ftplib from scratch my own..