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AuthorForum: PowerTCP FTP for .NET
Topic: A blocking operation was interrupted by a call to WSACancelBlockingCall
dheeruchakri
dheeru.chakri@gmail.com

From: Hyd, India
Posts: 4
Member Since: 11/07/08
posted November 7, 2008 6:24 AM

I receive the following exceptions.

#1 exp: A blocking operation was interrupted by a call to WSACancelBlockingCall
 
#2 exp: Send failed at the Socket Level. The Socket may have been closed abruptly or timed out.

My application is a multithreaded and 5 concurrent threads will be uploading files to a FTP Server.

When only one application is run I see no issues. However, if the second application was started its throwing the mentioned exceptions.

Each of the applications are multithreaded and each of them initiate 5 threads. so a total of 10 threads will be running when two applications were started.

Thanks for all/any help at the earliest.




Jason Farrar (Admin)

From: USA
Posts: 223
Member Since: 07/24/07

Extra Support Options
Custom Application Development

posted November 10, 2008 1:24 PM

We need you to wire up the trace event and send us a log of the communications between the ftp server and your application. Here is a code snippet to accomplish this:
 
'Wire up the trace event to your ftp control
this.ftp1.CertificateRequested += new System.EventHandler(this.ftp1_CertificateRequested);

//The event will fire whenever data is sent or received
private void Ftp1_Trace(object sender, Dart.PowerTCP.Ftp.SegmentEventArgs e)
{
 // Create FileStream to write to log file
 System.IO.FileStream stream1 = new System.IO.FileStream("c:\\FtpTest\\log.txt", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite);
 // Create text to precede sent/received data.
 byte[] recv = System.Text.ASCIIEncoding.ASCII.GetBytes("\r\nReceived <-- \r\n");
 byte[] sent = System.Text.ASCIIEncoding.ASCII.GetBytes("\r\nSent --> \r\n");
 // Set the stream position to append.
 stream1.Position = stream1.Length;
 // Check if data is incoming or outgoing and write appropriate data
 if(e.Segment.Sent == true)
  stream1.Write(sent, 0, sent.Length);
 else
  stream1.Write(recv, 0, recv.Length);
 // Write the data
 stream1.Write(e.Segment.Buffer, e.Segment.Offset, e.Segment.Count);
 // Close the stream
 stream1.Close();
}
dheeruchakri
dheeru.chakri@gmail.com

From: Hyd, India
Posts: 4
Member Since: 11/07/08
posted November 13, 2008 8:04 AM

he following exceptions were thrown after wiring up the Trace event.

Environment:
Number of threads : 10
Number of instances : 5
OS : Windows 2003
FTP Server: Serv-U
 
Exception #1

Failed while uploading Images,
exp: A connection attempt failed because the connected party did not properly respond after a period of time,
or established connection failed because connected host has failed to respond 
at Dart.PowerTCP.Ftp.ai.Invoke(Delegate A_0, Object[] A_1)  
at Dart.PowerTCP.Ftp.Ftp.Invoke(FtpCommand command, String modifier)  
at Dart.PowerTCP.Ftp.Ftp.Close()  

 
Exception #2
 
Failed while uploading Images, exp: Send failed at the Socket Level.
The Socket may have been closed abruptly or timed out. 
at DPI.OMS.UtilityLibrary.IO.FtpUtility.Upload(String localFilename, String targetFilename)  
at DPI.OMS.BusinessLibrary.VendorApp.BUploadAssets.UploadImage(OrderAsset objOrderAsset)  
at DPI.OMS.BusinessLibrary.VendorApp.BUploadAssets.UploadImages()

Any help at the earliest will be very helpful.
dheeruchakri
dheeru.chakri@gmail.com

From: Hyd, India
Posts: 4
Member Since: 11/07/08
posted November 17, 2008 1:53 AM

Am not able to post the log file because its huge. We have been testing with around 1500 images.

Please let me know as to where the logs should be uploaded.
Jason Farrar (Admin)

From: USA
Posts: 223
Member Since: 07/24/07

Extra Support Options
Custom Application Development

posted November 17, 2008 4:23 PM

You can send them to support@dart.com. I sent you an E-mail on Friday did you receive it?
dheeruchakri
dheeru.chakri@gmail.com

From: Hyd, India
Posts: 4
Member Since: 11/07/08
posted November 18, 2008 12:55 AM

Hi Jason,

I did receive the hot fix. Am working on it to verify if the exceptions vanish. I will let you know more after my testing.

However, the logs files were dispatched to support@dart.com per your input.

Thanks for all the help at the earliest.

Thanks,
Dheeraj
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