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

[Santhosh Y]

Hi Scott,

Yeah I understand it is not a Qt issue.
But I am struck here and I thought if some one helps me out who has a 
knowledge on this ,  it would be great.

Thanks.

On 7/8/2010 5:33 PM, Scott Aron Bloom wrote:
>
> Ask a COM list.. this has nothing to do with Qt..   Just because you 
> are using QAxObject doesn't make it a Qt issue
>
> *From:* qt-interest-bounces at trolltech.com 
> [mailto:qt-interest-bounces at trolltech.com] *On Behalf Of *Santhosh Y
> *Sent:* Thursday, July 08, 2010 4:58 AM
> *To:* qt-interest at trolltech.com
> *Subject:* [Qt-interest] How to know whether an instance of a COm 
> object isalready running
>
> 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  <http://www.softjin.com>
> ----------------------------------------------------
>   
>   
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-- 
----------------------------------------------------
Y Santhosh Kumar -
Senior Software Engineer,
SoftJin Technologies Pvt Ltd,
www.softjin.com
----------------------------------------------------



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