flatten to a string for sending via TCP/IP contains CRLF characters

Hello

I use a function 'flatten in string' to send data via TCP/IP.

To minimize delays, I use CRLF mode so that the receive function returns as soon as it receives a sequence CRLF (stop character).
I noticed that every now and then that part of the data is transmitted as the flattened string itself sometimes (but rarely) contains CRLF characters.
I was wondering if this is a correct behavior, or if I'm missing something. I expected to flatten to string in order to get channels pure ASCII without special characters.

Now I must first parse the string replace the CRLF characters of some known series of characters and do the opposite to the front desk and hope that that particular sequence never occurs.

Any comment is appreciated,

Manu

mkdieric wrote:

I expected to flatten to string in order to get channels pure ASCII without special characters.

I don't know why you would think this. A CR or LF is no more extraordinary than any character. In addition, the string you out is not "ASCII" and has never been--check the documentation. The output is entirely dependent on the entry, and it is perfectly possible to get a (hex 13) CR followed by a LF (10 hex) if the entry would produce flattened data which means that.

A better method, in my opinion, is to precede that you send with the number of bytes to wait. Then beside reception read you a fixed number of bytes for the numerical value that indicates the number of bytes comes, and read you this amount. The examples provided with LabVIEW show you this method.

Tags: NI Software

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