How do I test for a NULL return from a DLL for a C-type string?

jwf · ‎03-21-2001

I am not sure if this will answer your question, but a NULL character is an ASCII 0.
To test this in LabVIEW, you can use the comparison fuction called 'equal?'. To create a string constant with a NULL character: go to the string menu and get a string constant; right-click the constant and select 'Hex Display'; enter a 0 into the constant. Compare this to the string in question to see if it is a NULL.

P.Michael · ‎03-22-2001

(Thanks, jwf.)
(although no, that wasn't really the problem)

My further testing revealed that LV doesn't distinguish between the return of NULL for a (char *) (ie, C String) and the return of a pointer to the empty string: in either case, it reports the return as the empty string, which casts to a 0 integer.

(I tried to post this earlier, but Outlook Express sucked too much.)

LabVIEW

How do I test for a NULL return from a DLL for a C-type string?

How do I test for a NULL return from a DLL for a C-type string?

Re: How do I test for a NULL return from a DLL for a C-type string?

Re: How do I test for a NULL return from a DLL for a C-type string?