Object::connect: No such signal issue

mat007

Hi,
I create new signals and slots and when i run my program i have this error, but check it and everthing looks ok.
@
Object::connect: No such signal MainWindow::hotovo(vector<string> data) in mainwindow.cpp:15
Object::connect: (sender name: 'MainWindow')
Object::connect: (receiver name: 'Dialog')@

mainwindow.h
@#include <QMainWindow>
#include "dialog.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);
~MainWindow();
std::vectorstd::string cestaTabulky;
std::vectorstd::string jmenaTabulky;
std::vectorstd::string data2;
std::vector<int> pocty;
protected slots:
void naplnit_comboBox();
signals:
void hotovo(std::vectorstd::string data);
private slots:
void on_pridatBttn_clicked();
void on_comboBox_currentIndexChanged(int index);

private:
Ui::MainWindow *ui;
Dialog *pridani;

};@

mainwindow.cpp

@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
pridani = new Dialog(this);
connect(pridani,SIGNAL(created()),this,SLOT(naplnit_comboBox())); connect(this,SIGNAL(hotovo(vector<string>data)),pridani,SLOT(naplnit_comboBox2(vector<string> data) ) );

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_pridatBttn_clicked()
{

pridani->show();
}

void MainWindow::naplnit_comboBox()
{

emit hotovo(jmenaTabulky);

}

void MainWindow::on_comboBox_currentIndexChanged(int index)
{
QStandardItemModel model = qobject_cast<QStandardItemModel>(ui->tableView->model());
int radek = 0;
int sloupec = 7;

   int pocetRadku  = data2.size()/5;
   //if (index != 0) index-- ;

ui->tableView->updatesEnabled();
for (radek = 0; radek < pocetRadku;radek++)
{

           QStandardItem *item =  model->item(radek,sloupec);
           QString data = item->accessibleText();
           if(jmenaTabulky[index].compare(data.toStdString()) == 0)
               {
                   ui->tableView->setColumnHidden(radek,false);
               }
                   else
               {
                   ui->tableView->setColumnHidden(radek,true);
               }

    }

}

@

andreyc

Do you have any warnings from a compiler?

From you code I don't see that you have
@
#include <vector>
#include <string>
//... etc
@
Is it included in "dialog.h"

One more thing.
Do you use vector from STL?
You did not put std:: in front of vector and string in the signal declaration.
But you did it few lines above.

mat007

[quote author="andreyc" date="1401297592"]Do you have any warnings from a compiler?

From you code I don't see that you have
@
#include <vector>
#include <string>
//... etc
@
Is it included in "dialog.h"

One more thing.
Do you use vector from STL?
You did not put std:: in front of vector and string in the signal declaration.
But you did it few lines above.
[/quote]
yes, i it is. i correct namespace in hotovo and it havent effect on it.

andreyc

Do you have the same error ?
@
Object::connect: No such signal MainWindow::hotovo(vector<string> data) in mainwindow.cpp:15
@

mat007

[quote author="andreyc" date="1401298839"]Do you have the same error ?
@
Object::connect: No such signal MainWindow::hotovo(vector<string> data) in mainwindow.cpp:15
@
[/quote]

yes

andreyc

Yep, I see. Created a project and got the same result.
Try to use "new connect":http://qt-project.org/wiki/New_Signal_Slot_Syntax#b61c3e32c4a7548eb2a0ea5a505fd51b
@
connect(this, &MainWindow::hotovo, pridani, &Dialog::naplnit_comboBox2);
@

mat007

[quote author="andreyc" date="1401299367"]Yep, I see. Created a project and got the same result.
Try to use "new connect":http://qt-project.org/wiki/New_Signal_Slot_Syntax#b61c3e32c4a7548eb2a0ea5a505fd51b
@
connect(this, &MainWindow::hotovo, pridani, &Dialog::naplnit_comboBox2);
@[/quote]

no it doesnt work i use Qt 4.8.1

andreyc

As a workaround you may try to use QVector<QString>

jeremy_k

Are you certain that the signature of the signal and slot match? I put together this example that has a signal and slot which use std::vector.

@
#include <QCoreApplication>
#include <QMetaEnum>
#include <QDebug>

#include <cstdio>
#include <vector>

class Object : public QObject
{
Q_OBJECT
public:
Object() : QObject() {}

public slots:
void mySlot(std::vector<int> param)
{
qDebug() << "This is" << PRETTY_FUNCTION << "with" << param.front();
}

signals:
void mySignal(std::vector<int> param);
};

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

Object obj;
const QMetaObject *meta = obj.metaObject();
qDebug() << "walking meta-Object" <&lt; meta;
for (int i = 0; i &lt; meta->methodCount(); i++) {
    QMetaMethod method = meta->method(i);
    qDebug() << "method:" << method.methodSignature().data();
}
obj.connect(&obj, SIGNAL(mySignal(std::vector<int>)), &obj, SLOT(mySlot(std::vector<int>)));
std::vector<int> vec(1);
vec[0] = 12345;
emit obj.mySignal(vec);
return 0;

}

#include "main.moc"
@

jeremy_k

Having taken a closer look at the code, I think the problem is the use of the SIGNAL macro, which specifies a parameter of "vector" instead of "std::vector".

The old-style connect() is string driven, using the declaraction of the signal and slot, and the parameters to SIGNAL() and SLOT(). It doesn't know that vector is a std::vector if preceeded by using namespace std.