Integrate Cocoa in Qt

[mfniaki]

Hi,
I'm trying to embed some Cocoa-Objective C code in my Qt application(Using Qt Creator) to receive DockClickEvent. but when I want to compile it I get this linker error for the objective C part.

Undefined symbols:
"__objc_empty_vtable", referenced from:
_OBJC_METACLASS_$_DockIconClickEventHandler in dockiconclick.o
_OBJC_CLASS_$_DockIconClickEventHandler in dockiconclick.o

and here is my objective C code

#include <Cocoa/Cocoa.h>
#include <QDebug>
#include "dockiconclick.h"

@interface DockIconClickEventHandler : NSObject
{
@public
        DockIconClickMonitor* monitor;
}
- (void)handle:(NSAppleEventDescriptor*)event withReplyEvent:(NSAppleEventDescriptor*)replyEvent;
@end

@implementation DockIconClickEventHandler
- (void)handle:(NSAppleEventDescriptor*)event withReplyEvent:(NSAppleEventDescriptor*)replyEvent {
        if (monitor)
                monitor->emitEvent();
}
@end

class DockIconClickMonitor::Private
{
        public:
                DockIconClickEventHandler* handler;
};

DockIconClickMonitor::DockIconClickMonitor()
{
        d = new DockIconClickMonitor::Private();
        d->handler = [[DockIconClickEventHandler alloc] init];
        d->handler->monitor = this;

        [[NSAppleEventManager sharedAppleEventManager]
         setEventHandler:d->handler
         andSelector:@selector(handle:withReplyEvent:)
         forEventClass:kCoreEventClass
         andEventID:kAEReopenApplication];
}

DockIconClickMonitor::~DockIconClickMonitor()
{
        delete d;
}

void DockIconClickMonitor::emitEvent()
{
        emit dockIconClicked();
}

Please help me.