LabVIEW
STR to IP --- Which result?
LV 2018 SP1..
Consider this:
I want to display for the user, the IP address he should use to connect his instrument to the host CPU.
If I use the single-result mode, I get the IP number for something else (I have VMWare Workstation installed, but not running, when this screenshot was taken).
What I want is the "1.30" result (in this case).
What are the rules here? What order do these come back in?
I don't know if it will always be a "192.168.1.xxx" subnet or not.
Can I always use the LAST one in the array returned?
In this case I would probably run Ipconfig with the Systemexec.vi saving the output and parse the string.
Probably look for "Ethernet Adapter Ethernet:" and go from there.
I've used this on several occasions without any ambiguity, but realized that I was "asking the reverse question" -- I was running this from the PC and asking it about "devices that could be detected". Yes, there can be several devices out there (in particular, I'm currently "detecting" a myRIO, but if I go into MAX and look at "Remote Systems", I can find several myRIOs and a few other things (an sbRIO, for example). So my code looks at how many IPs were returned -- if 0, I tell the User that there's "no There there", if 1 I just connect, and if >1, I populate a ComboBox that shows me the IPs and names of the Devices and lets me choose which one to use. Here's a Snippet (since not even I am seriously using LabVIEW 2021 yet). The sub-VI "Choose" is a Dialog box that shows the Message "Choose Target" and populates a ListBox with the "Choices" returned by the System request, returning the single Choice the User selected.
Bob Schor
There is no trivial way to do that not even with parsing multiple command line tool outputs. Nowadays computers can have many different network adapters active at the same time. That can be virtual network adapters such as for your VmWare, built in adapters, WIFI adapters and adapters through docking stations, but even a USB port can be seen as an actual network adapter if the according device connected has a USB-LAN device class.
On my computer the String to IP node in array mode returns typically 6 or more IP addresses. So on such a computer your simple logic of trying to enumerate all IP addresses and eliminating things like VmWare will not work. And for the rest you can not rely on the name of physical network adapters, they can easily be renamed by the user.
Technically it is not wrong. That IP address is a valid address for your computer. That it is only useful when you want to talk from one of the VmWare instances configured to use VMNet8 (by default the NAT mode) to your host computer is simply a technical detail. 😁
The problem here is simply that the String to IP function uses the Winsock library to get the valid IP addresses. And Winsock seems to consider your VMNet8 address as the default address and therefore returns it as the first one.
I am not a networking expert (The more I find out about networking, the more I realize I don't know anything) and not even sure if this what you are looking for, but here is something I did a while ago that seemed to work for my needs. It lists all "real" IP address on your PC (ignoring the virtual ones)
