Follow/read a growing binary file

[ecc83]

Hello,

Application space:

1 - I have an application that has created and opened a binary file, and is is writing data to it
on a continual basis.

2 - Using another program written in Labview, I need to open this file for reading, get all the data available
(for the given file size at that instant) and update a strip chart/graph. The program also needs
to continue to follow that growing file and update the chart as new data is written to it by the
process (other program) that owns it.

Problem space:
If the file is already a certain size when the LV program opens it for reading, it needs to read in that
in it's entirety and update the chart with the complete data set as quick as possible. Then, it needs
to continue to check the file about every 250ms for new data and update the chart if there is new data.

So....How can I initially read in the file and update the chart as fast as possible, then use a controlled loop
rate of 250ms to continue to read in that same file if there is new data?

Suggestions...anyone? An algorithm? A rough diagram? alms for the blind?   ;~)

Gary.

[Albert.Geven]

try to read the file readonly.
Otherwise LabVIEW could block the writing or not succeed in opening the file.
And try reading the filesize and read again when data is available.

[ecc83]

Hello,

Your response is not germain to the description.

Thanks anyhow!

Gary.