How to use Cocoa in a Qt5 project?

Question

Cocoa

Hello!
I'm writing an application for OS X using Qt5 which keeps track of application launches.
How to get a list of running applications figured out:

#import <Cocoa/Cocoa.h>

QList<CProcInfo> procList;
CProcInfo procInfo;
for(NSRunningApplication *app in NSWorkspace.sharedWorkspace.runningApplications)
{
    procInfo.pid = (quint32)app.processIdentifier;
    procInfo.name = QString::fromNSString(app.localizedName);
    procInfo.path = QString::fromNSString(app.executableURL.path);
    procList << procInfo;
}

I call this code once in a certain period of time. But I don't think this is correct. I found this notification in the Cocoa documentation: NSWorkspaceDidLaunchApplicationNotification .
Just could not figure out how to use it in a Qt application.
Well, one more question for backfilling, if I may.
Here:
NSRunningApplication *app
as far as I understand, memory is allocated, how to free it when the app object is no longer needed?
Thanks in advance for your replies!