Read and close data from text/ode file

General
1

Hello there!

I have barcode scanner which is scanning the barcode and currently i'm sending it's value to a text file in RPI also I have used spreadsheet.odb(excel) file.
My problem is when i scan a barcode it is written in text/odb file but in node red the File node can not give me result unless and until I save the file.

So for every barcode scan i can not get it's latest value. (because i have to save the file and also I don't know what should i do after saving that)

I have seen many option out there but nothing works out, Can any one suggest that how can i Read the text file/spreadsheet and get the latest value and close it with save.

Thanks
Pranav

2

Are you sending it to the file in node-red or by some other means.

3

So my text editor is open always that why my barcode value is written.

For getting latest value i have to close the text editor with save and when I inject in node red I will get latest value

with out saving it will only gives me previous values

4

So I thought let nodered create one text file and open it so if i scan barcode its value will be there and after node red will close the text file and it will save it, so i will fetch the latest value it in node red.

But there is also be a condition that the values need to be deleted so only one value is there all the time.

I don't know is this easy solution or not?
Please suggest me

5

You might be better to use a dashboard text node to scan into, then it will all be under the control of node-red.

6

I tried it also but the problem is

  1. I have to click on dashboard text widget for getting data,(so cursor can blink there)

But For end application I will not have any screen to click on that text box.

  1. I also have to clear that textinput so that new text can be entered it.
    without deleting it will write with previous one, and I don't how to do it with this.

So what will be the solution for that?

7

As suggested in the other thread you could provide your own text input field using html in a template, you will have to research about html for that. As for clearing the field after actioning it that can be done in node-red by sending it an empty string.

8

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