file data log

[fabio.int]

Hello,

I'm developing an application that store data from different channels. Before to start the recording the operator has to do something. I have to control what he is doing, for this reason I want to write a file that has 5 minutes of history.My question is: how can I work directly with the file? I'd like to use the file like a FIFO. Do you have any suggestion?

[crossrulz]

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@fabio.int wrote:

Hello,

I'm developing an application that store data from different channels. Before to start the recording the operator has to do something. I have to control what he is doing, for this reason I want to write a file that has 5 minutes of history.My question is: how can I work directly with the file? I'd like to use the file like a FIFO. Do you have any suggestion?

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Do not do this.  It will be slow and a pain to maintain.  I recommend using circular buffer in your code instead.  Then you can periodically write the content of the buffer to a file as a backup.  The simplest way I have found to make a circular buffer is a fixed sized queue with the Lossy Enqueue.

[fabio.int]

Yes, I know... you are right. But for some reasons I have to work directly with the file... I'll find the "TDMS Delete Data" that seems to work like I want.