I Need Some Help With QObject::connect: No such signal QCommandLinkButton::click()

hello everyone this is my first post here...
i'am making a simple c++ program with gui,i'am building the gui manually using QCommandLinkButton and QLabel and QLineEdit,here's the code:

numericalsystemsconverter.cpp:

Code:

---

#include "numericalsystemsconverter.h"
#include "ui_numericalsystemsconverter.h"
#include <Qt>
#include <QLabel>
#include <QLineEdit>
#include <QCommandLinkButton>
 
NumericalSystemsConverter::NumericalSystemsConverter(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::NumericalSystemsConverter)
{
    ui->setupUi(this);
 
 
    QLabel *title=new QLabel(this);
    title->setGeometry(0,0,400,30);
    title->setStyleSheet("font-size:20px;");
    title->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
    title->setText("Numerical Systems Converter");
 
    QLineEdit *decimal_entry=new QLineEdit(this);
    decimal_entry->setGeometry(0,50,400,30);
    decimal_entry->setClearButtonEnabled(true);
    decimal_entry->setStyleSheet("font-size:20px;");
    decimal_entry->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
    decimal_entry->setPlaceholderText("Enter Your Decimal Number Here...");
 
    QCommandLinkButton *dec2bin=new QCommandLinkButton(this);
    dec2bin->setGeometry(0,90,400,50);
    dec2bin->setStyleSheet("font-size:20px;");
    dec2bin->setText("Convert To Binary");
 
    QLabel *result=new QLabel(this);
    result->setGeometry(0,250,400,30);
    result->setStyleSheet("font-size:20px;");
    result->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
    result->setText("The Result Should Appear Here...");
 
    QObject::connect(dec2bin,SIGNAL(click()),result,SLOT(QLabel::setText("Hello World")));
}
 
NumericalSystemsConverter::~NumericalSystemsConverter()
{
    delete ui;
}

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whenever i compile this code the gui appears successfully,but in the Application Output i see this message:

QObject::connect: No such signal QCommandLinkButton::click()

how to solve this problem?

Hi, multiple problems here:
1) the signal is called clicked(), not click()
2) you cannot pass values inside the connect() call like the "Hello World" string. Also don't write QLabel::setText. Instead write only the name of the slot. The class is determined by the type of the receiving object, in this case "result".

Best regards,

Ginsengelf

Quote:

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Originally Posted by Ginsengelf

Hi, multiple problems here:
1) the signal is called clicked(), not click()
2) you cannot pass values inside the connect() call like the "Hello World" string. Also don't write QLabel::setText. Instead write only the name of the slot. The class is determined by the type of the receiving object, in this case "result".

Best regards,

Ginsengelf

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thank you very much sir,i just want to understand the second part of your answer,can you give me an example?

Hi, something like this:

Code:

---

{
    ....
    QObject::connect(dec2bin,SIGNAL(clicked()),this,SLOT(slotSetLabelText()));
    }
 
void NumericalSystemsConverter::slotSetLabelText()
    {
    result->setText("Hello World"); // this assumes result is a member of NumericalSystemsConverter
    }

---

Ginsengelf