How to put header in write to put measurement file VI

[prabesh99]

I want to create my own header for the file. Although the header can be created from the setting of write to measurement VI, I cannot create my own header file. How can I make my own header on file? 

I have attached my VI

Thank you

[GerdW]

Hi prabesh,

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@prabesh99 wrote:

I want to create my own header for the file. Although the header can be created from the setting of write to measurement VI, I cannot create my own header file. How can I make my own header on file?

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You already create a file path: what's the problem to write your header into the file before the while loop?

When calling the WriteMeasurementFile ExpressVI you should re-check its settings: it's maybe a problem when the ExpressVI will overwrite already existing data instead of appending to the file.

You also have the option to get rid of ExpressVIs and use "plain" file functions to write your data into the file…

[RTSLVU]

1. Stop using Express VI's
2. Use the write to file primitive to write your headers to your file
3. Enter your acquisition loop
4. Use write to file primitive or Write to Delimited Spreadsheet VI to write lines of data to your file
5. Don't forget to close the file when you are done.

[prabesh99]

Dear  RTSLVU,

Thanks for your reply. I did what you suggest to me. I got a problem. The file contains only one data point ( I guess it is the last data point measured by the sensor), and how can I get all the data points as measured by the sensor? 

How can I put the header in the correct spacing? 

Thanks in advance!

[prabesh99]

Dear GerdW,

Hi

I used the plain text function to save the data. However, I can save only one data point. How can I save all the data point as measured by the sensors?

[GerdW]

Hi prabesh,

wh

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@prabesh99 wrote:

Dear GerdW,

I used the plain text function to save the data. However, I can save only one data point. How can I save all the data point as measured by the sensors?

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Why do you open the file inside the loop inside the case structure? We told you to create very different code!

Why do you close the file inside the loop?

Why is there a "default if unwired" tunnel holding a file reference?

Why is there no error handling with your file functions?

Again:

1. Open the file before the loop.
2. Write the header line(s) before the loop.
3. Inside the loop you can write new data to the file (in appending mode).
4. Close the file after the loop.

Have you examind any of all those example VIs coming with LabVIEW?

Why do you write two answers with attaching a VI using the very same filename, but with different filesize? That is very irritating (and annoying)!

[RTSLVU]

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@prabesh99 wrote:

Dear  RTSLVU,

Thanks for your reply. I did what you suggest to me. I got a problem. The file contains only one data point ( I guess it is the last data point measured by the sensor), and how can I get all the data points as measured by the sensor? 

How can I put the header in the correct spacing? 

Thanks in advance!

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I guess I was not clear enough...

1. Open a file
2. Write your headers to your file
3. Enter your acquisition loop
4. Acquire data
5. Write data to your file
6. Goto  4 until done
7. Close the file
8. Exit program

[prabesh99]

Hi RTSLVU, 

I did what you said, and now the problem is that I don't get data in scientific numerical. How can I get data in scientific numerical? Another question is, I want to make the given input integer in the header, but I could not make the header from the format into string VI.

Thanks in advance!

[GerdW]

Hi prabesh,

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@prabesh99 wrote:

the problem is that I don't get data in scientific numerical. How can I get data in scientific numerical?

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Read the help on format strings. Right now you use "%f", but there are a lot of other format codes…

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@prabesh99 wrote:

Another question is, I want to make the given input integer in the header, but I could not make the header from the format into string VI.

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Are you talking about "no. of data point for power"?

Place the terminal of this control before the case structure, then you can use its data for header generation…

(This is basic THINK DATAFLOW!)

[prabesh99]

Hi GerdW,

Thank you!

some times I got error 1 while running this Vi. How can I solve it?