VI to use already running using ActiveX

Is there a way to make it fail if it does not find a VI already running?  Any ideas on why it opens a new VI instead of reuse that in memory.  Is there a setting somewhere which might explain why this happens on the test computer and not my development machine.

I'm trying to control a VI in c ++ using the LabVIEW VI 9 ActiveX Server, I build the application using MS VC ++ express 2010.  This VI (lets call him he is VI - a call node to get and set data on another VI - b.)  For the test I have a copy of the VI - b, which is empty, it loads in memory but does not work, it connects to the material I don't have in my development Setup.

#import "PATH\LaVIEW.tlb".

public static LabVIEW::_ApplicationPtr pLVApp = (LabVIEW::_ApplicationPtr) NULL;

public static LabVIEW::VirtualInstrumentPtr pVI (LabVIEW::VirtualInstrumentPtr) = NULL;

Sub init_VI()

{

Multithreaded application

CoInitializeEx (NULL, COINIT_MULTITHREADED);

pLVApp.CreateInstance ("LabVIEW.Application");

Error in checking not illustrated

return;

}

Sub connect_to_fp()

{

HRESULT hr = S_OK;

password char [60] = ' ';

VARIANT_BOOL reserveForCall = false;

long options = 0x20;

Multithreaded application

CoInitializeEx (NULL, COINIT_MULTITHREADED);

pVI.CreateInstance ("LabVIEW.VirtualInstrument");

pVI = pLVApp-> GetVIReference (vi_path, LPCTSTR (password), reserveForCall, options);

Error in checking not illustrated

HR = pVI-> OpenFrontPanel (VARIANT_TRUE, LabVIEW::eVisible)

return;

}

I couldn't try to comment the call to CreateInstance on the test computer.  However to remove it had no effect on my development machine.

Details of my configuration:

On my development machine, I can run VI - a before you begin application c ++ and it will connect and use the VI - a, which is already running in memory or can I leave application c ++ bring up VI - a.  When I was running a test recently, when I would get the reference to the VI - a it would open a new FP for VI - a (I guess it started a new instance of VI - has) instead use the one which is currently loaded and current execution, the VI - a also is not running as it normally does.  The VI - a gets its values of VI - b once to the init, but it will never update them again.  Also, there is a switch on the VI - a, which controls a status indicator that is not updated when the switch when it is activated.  There is another indicator on a separate tab that indicates how long a loop has been run that changes, that is why I believe that it is at least partially running.

My biggest problem is I have not been able to recreate it on my development machine.  Any time I open VI - a and run my application c ++ reuses this one rather than trying to open a new.  My connection code is about the Strait of c + c++ / ActiveX example of OR.

Thank you.

I have not found an answer to the slightest mistake out instead of creating a new instance, but I found a way to address the issue of the project.  If you create an instance, then open the project, and then open the VI of the proceeding of projects, it will work.  New init_VI:

Sub init_VI()

{

Multithreaded application

CoInitializeEx (NULL, COINIT_MULTITHREADED);

pLVMainApp.CreateInstance ("LabVIEW.Application");

pLVPrj = pLVMainApp-> OpenProject (PATH_TO_PROJECT);

pLVApp = pLVPrj-> GetApplication();

Error in checking not illustrated

return;

}

Tags: NI Software

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