viOpen with string variable

[allencherry]

Please can any help -

I am trying to use use a string variable 'IP_Address' in the viOpen command structure

status = viOpen (defaultRM, "TCPIP0::192.168.10.50::inst0::INSTR", VI_NULL, VI_NULL,&Generator);

so that the hard-coded ip address 192.168.20.50 can be a variable read into 'IP_Address'  from user input.

I have tried formatting 'IP_Address' to contain "TCPIP0::192.168.10.50::inst0::INSTR" and then using:

viOpen (defaultRM, IP_Address, VI_NULL, VI_NULL,&Generator);

but get an error 'Invalid Resource Reference'.

Is there any way of accomplishing this?

Many thanks,

Allen Cherry

[markus kossmann]

Your idea should work. There must be a detail wrong, which is not  included in your description.

A guess:

What is the size of the IP_Address string ? Might it be that it misses the space for  terminating \0 char?

[RayFarmer]

Hi,

"TCPIP0::192.168.10.50::inst0::INSTR"

The inst0 should be the LAN device name of the instrument.

If you are using the default I think you can leave it out

eg

"TCPIP0::192.168.10.50::INSTR"

Regards

Ray farmer

[allencherry]

Markus,

Many thanks - your guess was correct!!

Allen

[allencherry]

Ray,

Yes - it does work leaving out the '::inst0'.

Thanks for your help,

Allen