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

[Scott Aron Bloom]

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
----------------------------------------------------
 
 
Business Disclaimer
____________________________________________________________
This e-mail message and any files transmitted with it are intended
solely
for  the use  of the  individual or entity  to which they  are
addressed. It
may  contain confidential,  proprietary or legally  privileged
information.
If  you  are  not  the  intended recipient please be advised that you
have
received  this  message in error and any use is strictly prohibited.
Please
immediately  delete it  and all copies of it from your system, destroy
any
hard  copies  of  it and  notify  the  sender  by return mail. You must
not,
directly or indirectly, use,  disclose,  distribute, print, or copy any
part of
this message if you are not the intended recipient.
 
 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20100708/7127b95e/attachment.html