Was an open file operation successful?

[zener]

How can I get an indication that an open file operation was successful.  I need a boolean indication so I can use it with case structures to write and ultimately close the file only if it was opened successfully. 

Is there a way to decipher the ref num?

Thanks

[Dennis_Knutson]

Why decipher the refnum? The file open function has an error out cluster. Just use the unbunble by name and get the status.

[Van_L]

Dennis is right

Please look at the picture for reference


Message Edited by Van_L on 02-26-2008 11:56 AM

Message Edited by Van_L on 02-26-2008 11:57 AM

[Rod42]

You can even wire the error cluster directly to the select terminal of a case, and see the case structure change colour!

Rod.

[lounatic]

Somewhat unrelated to the topic, but what happens when the write file in this example returns an error? So the file is opened or created without error, but the write produces an error. Does the file get closed?

Dave

[David_L]

According to the Close File Function Help: 

If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally even if an error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out.