Create constant NULL

[Luismeg25]

Good Afternoon.

I use a library in C for programming an aplication in Labview (I use call library function). The problem consist that I need introduce a NULL value as an argument inside the function. Somebody can tell me , How can I create a numeric constant NULL in LabView.

Thank you very much.

Best regards
 

[Norbert_B]

A simple numeric constant with value of '0' possibly could do it. If not, you propably have to use "Not a Refnum"-constant (File IO-palette).

Posting the sources of the DLL and your present approach in LV (VI) could help in helping you...and please tell us which version of LV you are working with...

hope this helps,

Norbert 

[Jarrod_S. · Accepted solution]

Norbert is correct. A simple I32 constant of zero will work. Just make sure to pass the value in by Value instead of Pointer to Value in the Call Library Function Node configuration, so that you pass in the value zero.

[Luismeg25]

Thank's you very much for yours answers. you were very fast. I could resolve my problem with this type of variables perfectly.