[Qt-creator] Qt Creator setting to open projects in new instance ?

Ed Sutton ESutton at fescorp.com
Fri Jan 20 15:37:04 CET 2012

Thank you for your help Daniel.

- Under CentOS 5.3, double-clicking a Qt project opened a new Qt Creator instance which is the default behavior I expected.  
- Under Vista, double-clicking a *.pro project file displays a Qt dialog behaving as if it had been launched with the --client option.  The dialog says:

"Could not send message"
"Unable to send command line arguments to the already running instance.
It appears to be not responding.  DO you want to start a new instance of Creator?" 
"Yes, Retry, No"

At the time the dialog is displayed,  the project had already been added to my previous instance of Qt Creator. Answering Yes will start a second instance but now I will have the same project open in the original instance *and* the new instance.

Hopefully whatever I did to solve this issue under 2.4 RC will come back to me.  As a work-around, I can launch the second instance of Qt Creator from my desktop shortcut which always creates a new instance and then manually load the project into this new instance.

Thanks again,


On Jan 20, 2012, at 4:01 AM, Daniel Teske wrote:

> On Thursday 19 Jan 2012 22:31:26 ext Ed Sutton wrote:
>> I upgraded to 2.4 release and behavior reverted to default behavior which
>> is to add the project to a currently running instance of Qt Creator under
>> Windows Vista.
> Actually, I don't recall any changes.
>> Sorry, where was the setting to make it open a new instance of Qt Creator?
> The command line option -client controls that. So you might want to look at 
> the file association and whether that maybe contains -client.
> daniel
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