Open file in Sub VI and close in Main VI

[Gagan_01]

Hi,

Question:

I am opening a file using a Sub-VI, but i am unable to close it in my main VI. Is there a way of passing the refnum between Sub-VI's ?

Or is there a cleaner way of doing this ?

Thanks

GM

[Dai]

Hi,

You can pass the refnum. Use Controls=>Refnum=>Byte Stream File Refnum and Change to indicator

or just right click on the refnum output node of the open file vi and select create=>indicator.

[Dai]

Hi,

You can pass the refnum. Use Controls=>Refnum=>Byte Stream File Refnum and Change to indicator

or just right click on the refnum output node of the open file vi and select create=>indicator.

[tbob]

Although this can be done, it is not good programming practice to do so.  You should open files in one vi, read/write to them in the same vi or in subvi's, and close the file at the level where it was opened.  This is proper modular programming.  Then you would not need references.  You could just wire the file refnum into your subvi.  Of course this is a general statement.  You could have a very good reason why you are doing it your way.