[Qt-interest] How to know whether an instance of a COm object is already running

[Santhosh Y]

Hi,

How  to know, whether an instance of a COM object is already 
existing/running?

In following main(), I am reading a factory instance. Using Factory 
instance I am creating an instance of the COM object for invoking few 
methods on it.
I would like to know, when an instance of COM object is already 
existing/running, I should not be creating a one more instance /*instead 
I should use the same one*/.
How to ensure this?

int main ()
{
     IClassFactory* factory = 0;
     // Getting the factory
     HRESULT res = 
CoGetClassObject(QUuid("{084EF014-6C9B-4d50-8756-263CDAC6DE4B}"), 
CLSCTX_ALL,  0, IID_IClassFactory,  (void**)&factory);

     if (factory) {

         // I would like to know here whether an instance is already 
present/running on machine
         // If YES, I should get that instance for invoking few methods 
on it. Else I should be doing this.
         // creating instance
*   res = factory->CreateInstance(0, IID_IUnknown, (void**)&ptr);*

         //Creating a QAxObject that wraps the COM object referenced by 
IUnknown.
         QAxObject* comObj= new QAxObject (ptr);
         comObj->dynamicCall("setPath", 
"C:\\cygwin\\home\\JNK\\aera2GUI\\bin_dbg\\aera2gui.exe");
         comObj->property("renewIAState").toInt();
     }
}

Please help me in this regard.

Regards,

-- 
----------------------------------------------------
Y Santhosh Kumar -
Senior Software Engineer,
SoftJin Technologies Pvt Ltd,
www.softjin.com
----------------------------------------------------



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