How do I run totally sperate VI's from a compiled application
Hi, I have hit a wall here and am not sure which direction I should be moving in. A relevant detail, running LV8.2 and application builder on Vista/XP. Any suggestions on the approach I should be taking would be most helpful.
I have a top level application (compiled in the application builder) from there I wish to run other VI's that are elsewhere in my local network file system. So the top level application gives the user a standard interface, from which they can then run the other VI's which are task specific (but that detail does not matter to the user).
As time goes by I will be adding more of the task oriented vi's to the system and I want avoid having to make these task oriented vi's part of the top level application as maintenance will be more painful. Having the ability to fix or add a new individual task oriented VI's without having to recompile the whole top level application is the aim.
On top of this I do need to pass some info to the task oriented VI and obtain some information back from it.
Some points that I can't get my head around at this stage are -
1. The task oriented VI's - do I have to compile these with application builder or can I call an uncompiled VI and run it in the top level application(I think not)?
2. How do I call the task oriented VI from the top level application - I have looked at "Open VI Reference" and "Open Application Reference" and am not sure how these apply to this situation.
So any thoughts would be appreciated, otherwise I am stuck with a lot of tedious trial and error to figure this out.
Many Thanks.
Herbert Niesler
Solved!
Go to Solution.
You can use the concept of "Plug-ins" in your current architecture.
I have attched a simple calculator vi which actually lets you know how to use this feature in LabVIEW.
I have created an exe for my Main.vi (called calc.exe)which would serve as the standard user interface. There are plugins by name Add, sub,mul and dev.vi
These vi are specifically kept in the Plugins directory so that "main" (the calc.exe) knows where to look for these vi's and if present they will get populated to the control called "operations".
So your task oriented vi's could be made as plugin vi's
Also, the the run time engine in LV can load files with ".vi" extension. so if you are creating a new vi to perform different task, create a seperate vi and then place them in the plugin folder. Please note that the connector pane must be identical for all the plugin vi's and if you think that your plugin vi's have different input and output terminals then create a cluster for all the inputs(or outputs) and flatten them to string or variant so that ou can maintain a same connector Pane pattern.
Regards
Guru (CLA)
Attachments:
Calc.zip 160 KB
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or even: bash /downloads/selinux/policy/addusers.sh
Now, i have a java program, and its meant to just execute that script. It doesnt throw any Exceptions at runtime. But when i look at the users file, and expect it to have an extra line that was the string variable, the file is UNTOUCHED!
Again, direct command line invocation works, but not from java. Here's what my invocation from java looks like:
Process p = Runtime.getRunTime().exec("bash downloads/selinux/policy/addusers.sh");
The strange thing is, i tried a different bash command. I tried:
Process p = Runtime.getRunTime().exec("mkdir /temporary");
and this worked!
so why not the other one??
I cant figure it out.You say:
bash /downloads/selinux/policy/addusers.sh
And you say in Java:
Process p = Runtime.getRunTime().exec("bash
downloads/selinux/policy/addusers.sh");
As if a leading / would be missing from the Java
version...nyix says:>
...OK sorry about that. i DO have a / in front of the downloads.... section in the java method. So its:
Process p = Runtime.getRunTime().
exec("bash /downloads/selinux/policy/addusers.sh");
HELP please?
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