Inconsistent newline using Write to Text function

[_Ben_]

Hello,

I have a subvi in my project that is used to log data to a text file according to a user specified recording interval. I use the Get Date/Time in seconds function and concatenate the output to my data using format into string. Then I use the Write to Text File function to write the string to the file. 99% of the time, Write to Text seem to appends a CRLF to the end of the line. 1% of the time it doesn't seem to append a CRLF and I end up with a line in my log file that looks like "Timestamp,Data,Next_Timestamp,Next_Data"

I suspect a race condition maybe causing my trouble due to the inconsistent nature of the problem, but I don't see where it could be coming from. I've attached a .png showing my logfile code. Please let me know if you need any additional information. Thanks!

[crossrulz]

Your issue would have to be coming from the Current Data input.  So you need to look everywhere that you call this subVI and make sure the end of line constant is correct.

[_Ben_]

Thanks for the reply!

Unless I am somehow mistaken, I am not providing the end of line constant. Instead, the Write to Text function is appending it to the string I am passing. It's just sometimes, for whatever reason, Write to Text doesn't append the end of line.

[crossrulz]

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_Ben_ wrote:

Unless I am somehow mistaken, I am not providing the end of line constant. Instead, the Write to Text function is appending it to the string I am passing. It's just sometimes, for whatever reason, Write to Text doesn't append the end of line.

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You are mistaken.  The Write To Text File does not append an End Of Line.  You have to write it.

[billko]

Why don't you post the actual code instead of a picture so we can see what is in the other cases not visible in the picture?  Seems kind of convoluted for simple log file.

[JÞB]

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@_Ben_ wrote:

Hello,

I have a subvi in my project that is used to log data to a text file according to a user specified recording interval. I use the Get Date/Time in seconds function and concatenate the output to my data using format into string. Then I use the Write to Text File function to write the string to the file. 99% of the time, Write to Text seem to appends a CRLF to the end of the line. 1% of the time it doesn't seem to append a CRLF and I end up with a line in my log file that looks like "Timestamp,Data,Next_Timestamp,Next_Data"

I suspect a race condition maybe causing my trouble due to the inconsistent nature of the problem, but I don't see where it could be coming from. I've attached a .png showing my logfile code. Please let me know if you need any additional information. Thanks!

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just slap a build array on the string in front of the write to text file.

I know, that kind of sucks to have such a simple solution available but it works without having to go and dig through all the callers.  That EOL conversion can forgive a lot of string formating mistakes.

[billko]

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@JÞB wrote:

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@_Ben_ wrote:

Hello,

I have a subvi in my project that is used to log data to a text file according to a user specified recording interval. I use the Get Date/Time in seconds function and concatenate the output to my data using format into string. Then I use the Write to Text File function to write the string to the file. 99% of the time, Write to Text seem to appends a CRLF to the end of the line. 1% of the time it doesn't seem to append a CRLF and I end up with a line in my log file that looks like "Timestamp,Data,Next_Timestamp,Next_Data"

I suspect a race condition maybe causing my trouble due to the inconsistent nature of the problem, but I don't see where it could be coming from. I've attached a .png showing my logfile code. Please let me know if you need any additional information. Thanks!

---

just slap a build array on the string in front of the write to text file.

I know, that kind of sucks to have such a simple solution available but it works without having to go and dig through all the callers.  That EOL conversion can forgive a lot of string formating mistakes.

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So it won't add an extra EOL if one is already there?

[JÞB]

@ Not so lowly minion

Nope,  It'll convert any EOL it sees to the OS specific EOL and only add one if its missing one.

Open the example from the help and play with it to prove it to yourself.

[_Ben_]

Sorry about that! Here is the code.

[altenbach]

This code looks very fragile.

• How do expect a reasonable refnum out if the FALSE case executes?
• Definitely don't convert EOL when writing (right-click...uncheck convert EOL)
• What is the reason for the sequence structure? Makes no difference here.
• ...