File Operations: Write to binary file (with Clusters)

[SercoSteveB]

Which of the following most closely describes the sizes of the files generated by the following VI?

a) steve.txt is the same size as steve2.txt

b) steve.txt is larger than steve2.txt

c) steve.txt is smaller than steve2.txt

d) steve2.txt is the larger as steve.txt was not created due to an error

[crossrulz]

Can you update that picture to either be a snippet or make it larger.  I can't quite make out what's happening.

[crossrulz]

A

[Neelamma]

Ans:A

[Pratibha]

Ans:- A

[Asha_Nagaraj]

Ans :- A

[mini09]

A...

[faymia]

Agreed with all of the folks above, the answer is A.

[SercoSteveB]

Answer: A.  Nice one crossrulz, Neelamma, Pratibha, AshaNagaraj, gnshmrthy & faymia

[clendon.gibson@canrig.com]

The answers refer to steve.txt, but the files are steve.bin.

Can someone explain why a cluster with a string is the same size on disk as just the string?

[plyons]

I would love to see some kind of explanation here- I got the answer wrong thinking that a cluster of a string would contain more information in binary form than just a string (of the same length).  I made myself a little vi to try and learn this stuff (seeing as Im now feeling like I'm far less knowledgable than I thought I was haha) and I have a question.

I'm attaching a pic of some code that I dont quite understand - this could be a dumb question, but I'm too frustrated to care.

why dont the two-element cluster and the double length string have the same file size? (20 vs 16bytes)

[john111]

Yeah i would also like to know the answer to this question. And why is file with a "string" 10bytes big? Shouldn't it be 6 bytes? I've opened the file and there are some spaces in there, that's why it's 10 bytes then. Why it adds the spaces?

[crossrulz]

When writing to a BINARY file, there is on option on the top of the Write Binary File to prepend the Array and String lengths.  By default, it is set to true.  So for each string, there will be 4 bytes (I32) written before the string saying how long the string is.  In the case of the two string cluster, this length is added to each string.

If you just want to write plain text, you should use the Write Text File instead.

[ashwinilele]

Ans is A

Very good explained by plyons

[hemanths]

hi all,

Can any one please explain me that, To know the file size i am using Get file size function. Please find in the snippet. Is that

correct or any other alternate method(shortcut). Please explain. Sorry for my Limited Knowledge.

[crossrulz]

hemanths wrote:

                       

To know the file size i am using Get file size function. Please find in the snippet. Is that

correct or any other alternate method(shortcut).

                   

That is the way to do it.  I would probably get the size after the File Close, but it should not really matter.

[hemanths]

Thanks