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Member
geraldW
Posts: 26
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Append text to end of file

Hello,

how can I append text to the end of a file?
I open the file using the operation "open or create". Then the existing text is overwritten with the new text.
I want to add the new text to the end of the file. How can I do this?

Kind regards,

Gerald


Member
Kumar_B
Posts: 85

Re: Append text to end of file

Connect file size terminal in open/create/Replace vi to Pos offset terminal of write file.
 
See attachement
 
-Kumar B
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JB
Posts: 2,798

Re : Append text to end of file

The way to do this is explained in the context help of Write to Text File or Write to Binary File.

You must set the cursor position to the end of the file by using Set File Position. Insert this function between Open/Create/Replace File and Write to Text File or
Write to Binary File and set its offset input to 0 and its from (0:start) input to end.

See attached example.
Active Participant
Jorge_Amaral
Posts: 462

Re: Append text to end of file

Hello,

using the open/create, you've to give the position of the end of file to the .vi that's going to write text. See the the attached file for the example that I've made for you. It was written in Labview 8.2.1. But if you can't open it, you can always see the attached pic.

Other way, it's by "write to spreadsheet file". this vi has the option "append".

The names in quotes are not exactly has they are in labview. But I can confirm them in the moment
Software developer
www.mcm-electronics.com

PS: Don't forget to rate a good anwser ; )

Currently using Labview 2011
PORTUGAL
Member
lakku
Posts: 1
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Re: Append text to end of file

Hello,

         I have the same question. Only I have like 10 excel files and I need all the data in one file (in the same order as th files are). Can you please let me know how i can input multiple files and append them into one single file.

Thanks

laxmikanth

 

Member
CTLin
Posts: 2
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Re: Re : Append text to end of file

These are all very good answers.

The thing I don't understand is why NI would take out the append to file option from the Write To Text File function in the first place.

Knight of NI
RavensFan
Posts: 15,913
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Re: Re : Append text to end of file

Why do you say NI took out the append to file option?

 

Maybe it was never there to begin with.

Knight of NI
Posts: 18,064
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Re: Re : Append text to end of file

 


CTLin wrote:

These are all very good answers.

The thing I don't understand is why NI would take out the append to file option from the Write To Text File function in the first place.


 

The Write to Text File function was not introduced until LabVIEW 8, and it never had an "append" input. You're probably thinking of the Write Characters to File that existed back in LabVIEW 7 and prior.

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Cory_K
Posts: 1,545
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Re: Re : Append text to end of file

 


smercurio_fc wrote:

 


CTLin wrote:

These are all very good answers.

The thing I don't understand is why NI would take out the append to file option from the Write To Text File function in the first place.


 

The Write to Text File function was not introduced until LabVIEW 8, and it never had an "append" input. You're probably thinking of the Write Characters to File that existed back in LabVIEW 7 and prior.


There is also an append option on the "Write to Spreadsheet File" VI.

 

Cory K
Member
CTLin
Posts: 2
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Re: Re : Append text to end of file

Yes, we had Write Characters To File before which has append option. The Write To Text File seems to replace that except the easy append option is not there. NI should simply add that.

 

CT