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

i created connection between server , client, connection works fine in console, coudn't connect qtcpserver class gui signals , slots. here 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; } 

you have typo in connect method: ihm_connetion

qobject::connect(&server,signal(**ihm_connetion**()) 

while emitted signal is:

 emit ihm_connection() 

qobject:connect returns bool value indicates if signal-slot connection successful. checking value (for example, q_assert) practice , can save lot of time in case of typos this. .