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:
Qt Code: 
  1. #include "numericalsystemsconverter.h"
  2. #include "ui_numericalsystemsconverter.h"
  3. #include <Qt>
  4. #include <QLabel>
  5. #include <QLineEdit>
  6. #include <QCommandLinkButton>
  7.  
  8. NumericalSystemsConverter::NumericalSystemsConverter(QWidget *parent) :
  9.     QMainWindow(parent),
  10.     ui(new Ui::NumericalSystemsConverter)
  11. {
  12.     ui->setupUi(this);
  13.  
  14.  
  15.     QLabel *title=new QLabel(this);
  16.     title->setGeometry(0,0,400,30);
  17.     title->setStyleSheet("font-size:20px;");
  18.     title->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
  19.     title->setText("Numerical Systems Converter");
  20.  
  21.     QLineEdit *decimal_entry=new QLineEdit(this);
  22.     decimal_entry->setGeometry(0,50,400,30);
  23.     decimal_entry->setClearButtonEnabled(true);
  24.     decimal_entry->setStyleSheet("font-size:20px;");
  25.     decimal_entry->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
  26.     decimal_entry->setPlaceholderText("Enter Your Decimal Number Here...");
  27.  
  28.     QCommandLinkButton *dec2bin=new QCommandLinkButton(this);
  29.     dec2bin->setGeometry(0,90,400,50);
  30.     dec2bin->setStyleSheet("font-size:20px;");
  31.     dec2bin->setText("Convert To Binary");
  32.  
  33.     QLabel *result=new QLabel(this);
  34.     result->setGeometry(0,250,400,30);
  35.     result->setStyleSheet("font-size:20px;");
  36.     result->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
  37.     result->setText("The Result Should Appear Here...");
  38.  
  39.     QObject::connect(dec2bin,SIGNAL(click()),result,SLOT(QLabel::setText("Hello World")));
  40. }
  41.  
  42. NumericalSystemsConverter::~NumericalSystemsConverter()
  43. {
  44.     delete ui;
  45. }
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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?