Internet Toolkit 6.0.1 and TCP error 66

[David Moerman]

FYI for anyone interested.  I just experienced a problem upgrading Internet Toolkit from 6.0 to 6.0.1.  (I also upgraded LV 8.2.1 to LV 8.5 concurrently).  I am using "URL Get HTTP Document.vi" to get a small (1KB) text file from the web server, and it gave me error 66 when I upgraded, whereas it was working perfectly before.  Switching back to version 6.0, it is now working again with LV 8.5.  I've wasted enough time on this one and don't have the patience to dig further, but the error occured in the "TCP Buffered Read.vi" component.  I did a VI comparison on both of these and nothing changed between versions.  Error 66 presumably has something to do with this.

--David Moerman

[RDR]

Thank you for reporting this, I will investigate this further.  What operating system are you using when this error occurs?

[falseth]

Hi David Moerman. This error occurs in the VI "TCP Buffered Read.vi" (found at LabVIEW-directory\vi.lib\addons\internet\utils\tcputil.llb\TCP Buffered Read.vi). In the image below, you can see the original VI code and the problematic portion (highlighted). 

There are two possible workarounds for this problem.

• Workaround 1: change the number of bytes to read (replace 1024 by 1). Look the image below.

• Workaround 2: change the behavior of the read operation with the parameter mode. Is this case, the parameter value was modified to "CRLF". Look the image below.

I hope this help.

My regards,

Vinicius

[falseth · Accepted solution]

The same message with the links to the images.  🙂

Hi David Moerman. This error occurs in the VI "TCP Buffered Read.vi" (found at LabVIEW-directory\vi.lib\addons\internet\utils\tcputil.llb\TCP Buffered Read.vi). In the image below, you can see the original VI code and the problematic portion (highlighted). 

There are two possible workarounds for this problem.

• Workaround 1: change the number of bytes to read (replace 1024 by 1). Look the image below.

• Workaround 2: change the behavior of the read operation with the parameter mode. Is this case, the parameter value was modified to "CRLF". Look the image below.

I hope this help.

My regards,

Vinicius