How can I end my LV7 program externally?

[Daniel_Chile]

Hi. I developed a DAQ application in LabView 7.1 which is intended to be running 24 hours a day. The PC is protected with an UPS which can safely shutdown WinXP in case of power failure.
Now, before ending windows I would like (I really NEED) to end my program safely by means of a windows command or something like that, issued by the UPS. I mean, I need to tell my UPS how to end my program.

Note: By now I'm running my VI from LabView, but soon I will complile it as a stand alone application (with the application builder).

Thanks.

[Wiebe@CARYA]

Hi,

Most UPS's have a serial connection that can be read by LabVIEW. By studying
this protocol, LabVIEW can close itself. It's the most decent option.

Another option is to make a vi "Stop All" that is set to auto-run. This VI
stops (and closes) all top level vi's, exept itself. You can start this vi
with a command line ("c:\program.....\LabVIEW.exe "stop all.vi"" or
something), even when LabVIEW is already running. The vi will stop all
running vi's. If you need a gracefull shutdown, you can have the started vi
set a global (or pref. a buffer) that is used by the main program. You can
even let the started vi generate a dynamic event, but that is a bit harder.

To my own supprise, this also works with the executable (I tried it with a
buffer). Just use main
.exe instead of labview.exe.

The last option is to communicate using windows. You can use memory mapped
files, windows messages, or even a normal file.

Regards,

Wiebe.


"Daniel_Chile" wrote in message
news:506500000008000000E4FC0000-1079395200000@exchange.ni.com...
> Hi. I developed a DAQ application in LabView 7.1 which is intended to
> be running 24 hours a day. The PC is protected with an UPS which can
> safely shutdown WinXP in case of power failure.
> Now, before ending windows I would like (I really NEED) to end my
> program safely by means of a windows command or something like that,
> issued by the UPS. I mean, I need to tell my UPS how to end my
> program.
>
> Note: By now I'm running my VI from LabView, but soon I will complile
> it as a stand alone application (with the application builder).
>
> Thanks.

[Daniel_Chile]

Hi, Wiebe, thanks for your answer.
I also thougth about setting a global that's read by the main program, and it worked fine before building the executables. After that I couldn't make the "main" and the "stop" programs to share the global as I wanted.
I understand that you successfully used a "buffer" (may I understand "a queue"?) that worked fine even as executables. Could you post the example for me?

Thank you,

Daniel

[Wiebe@CARYA]

"Daniel_Chile" wrote in message
news:5065000000050000008DDA0100-1079395200000@exchange.ni.com...
> Hi, Wiebe, thanks for your answer.
> I also thougth about setting a global that's read by the main program,
> and it worked fine before building the executables. After that I
> couldn't make the "main" and the "stop" programs to share the global
> as I wanted.
> I understand that you successfully used a "buffer" (may I understand
> "a queue"?) that worked fine even as executables. Could you post the
> example for me?
>
> Thank you,
>
> Daniel

Sure, here is the main, the buffer and a vi to set a value in the buffer.
It's not much though. I also included the build script.

The main just displays a string from a buffer
. Set String.vi puts a string
in the buffer, the string stays in the buffer until something else is put
into it (you can run set string again).

I set the text in main.exe by executing 'main.exe "Set String.vi" '. I do
thing a global should work too, but only when a vi that sets the global is
run like this from the command line.

Regards,

Wiebe.



[Attachment String buffer.vi, see below]


[Attachment Set String.vi, see below]


[Attachment Main.vi, see below]


[Attachment main.bld, see below]


[See first reply for additional information]

[Wiebe@CARYA]

[Additional attachment(s)]

[Daniel_Chile]

Ok, Wiebe, I understand that by executing 'main.exe "Set String.vi"' I'm making the "external" vi to run once on the same execution engine of the executable, am I right?
I think that it should work. Thanks and see you!

Daniel

[Wiebe@CARYA]

"Daniel_Chile" wrote in message
news:506500000005000000FBDA0100-1079395200000@exchange.ni.com...
> Ok, Wiebe, I understand that by executing 'main.exe "Set String.vi"'
> I'm making the "external" vi to run once on the same execution engine
> of the executable, am I right?
> I think that it should work. Thanks and see you!
>
> Daniel

You are right!

Regards,

Wiebe.