Trying to connect QTcpServer to GUI with signals - c++

Question

I created a connection between server and client, the connection works fine in console, but i coudn't connect my QTcpServer class to GUI with signals and slots. Here is my code :
ServerTCP.cpp
ServerTcp :: ServerTcp (QWidget *parent)
{
listen(QHostAddress::Any,4000);
QObject:: connect(this, SIGNAL(newConnection()),
this, SLOT(connectionRequest()));
}
void ServerTcp :: connectionRequest()
{
emit IHM_connection();
clientConnection = nextPendingConnection();
QObject:: connect(clientConnection, SIGNAL(readyRead()),
this, SLOT(read()));
}
void ServerTcp::read()
{
QString ligne;
while(clientConnection->canReadLine())
{
ligne = clientConnection->readLine();
emit IHM_text(ligne);
}
QTextStream text(clientConnection);
}
ManinWindow.cpp
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QObject::connect(&server,SIGNAL(IHM_connetion()),this,SLOT(connectionRequested()));
QObject::connect(&server,SIGNAL(read(QString)),this,SLOT(print_text(QString)));
}
void MainWindow::on_quitButton_clicked()
{
qApp->quit();
}
void MainWindow::print_text(QString text){
ui->log->append("message : " + text);
}
void MainWindow::connectionRequested(){
ui->log->append("connection OK!");
}
MainWindow::~MainWindow()
{
delete ui;
}

Answer 1

You have a typo in connect method: IHM_connetion
QObject::connect(&server,SIGNAL(**IHM_connetion**())
while the emitted signal is:
emit IHM_connection()
QObject:connect returns a bool value which indicates if signal-slot connection was successful. Checking this value (for example, with Q_ASSERT) is a good practice and can save you a lot of time in case of typos like this. .