Qt5.3 Signal and Slots + Parameters

ion_knight

Ok having a bit of problems with connecting two parts of my program together firstly we have below the emitted signal being used (which i presume is correct).

@CCTVForm * lCCTVForm = fFormController->getGUIForm();
const uint8_t * lLCID = aLCID.value();

    *lCCTVForm << "LC Select - Check\r\n"
               << "\tSequence Number: " << static_cast< int >(aSequenceNumber.value()) << "\r\n"
               << "\tLCID: " << static_cast< int >(lLCID[0])
                             << static_cast< int >(lLCID[1])
                             << static_cast< int >(lLCID[2])
                             << static_cast< int >(lLCID[3])
                             << "\r\n"
               << "\tLC Name: " << aName << "\r\n" 
               << "\tCamera 1: " << aCamera1.lcid().id() << "\r\n"
               << "\tCamera 2: " << aCamera2.lcid().id() << "\r\n"
               << sendToForm;

    emit emit_camera_info(aCamera1.lcid().id(),aCamera2.lcid().id());@

Inside the .hpp file
@signals:
void emit_camera_info(QString,QString);@

Then on my cctv form I want to be able to pass the two camera LCID's to CCTVForm.

@ // Create the widgets
cctv_mplayer_wrapper *Cameras = new cctv_mplayer_wrapper();

// Add to the form
centralWidget()->layout()->addWidget(Cameras);
CCTVController *Control = new CCTVController();

    QObject::connect(Control,&CCTVController::emit_camera_info(QString,QString),
                 this,&CCTVForm::update_camera_info(QString,QString));

//
//
Cameras->set_rtsp_path_cam_1("rtsp://169.254.133.191/output");
Cameras->set_rtsp_path_cam_2("rtsp://169.254.133.193/output");
Cameras->start_mplayer();@

.hpp file
@void update_camera_info(QString Camera1, QString Camera2);@

It's currently failing with
bq. C:\Software\lxc - Copy\cctv\src\cctv_form.cpp:274: error: expected primary-expression before ',' token
QObject::connect(Control,&CCTVController::emit_camera_info(QString,QString),this,&CCTVForm::update_camera_info(QString,QString));

As you can imagine I'm a bit lost on this as it seems to me to be a correct connect statement. If anyone has an idea how this is caused I would be very grateful.

t3685

Hi,

You are mixing up the two syntaxes to connect signals and slots.

The first form uses macros and needs function parameters:

@QObject::connect(&a, SIGNAL(valueChanged(int)),&b, SLOT(setValue(int)));@

The second form uses pointer to member functions and doesn't parameters:

@ QObject::connect(&a, &Counter::valueChanged,&b, &Counter::setValue);@

Good luck!