c++ - Add network to Qt Project -

i try use qtnetwork library , added dependencies in .pro file. when compile code qt creator fails in building project , claims

c1083: include "qtcpsocket": no such file or directory - telnet.h:4

i thought adding network .pro file enough?

networkmonitor.pro

#------------------------------------------------- # # project created qtcreator 2017-07-24t13:18:19 # #-------------------------------------------------  qt += core gui network charts  # greaterthan(qt_major_version, 4): qt += widgets  target = networkmonitor template = app  # following define makes compiler emit warnings if use # feature of qt been marked deprecated (the exact warnings # depend on compiler). please consult documentation of # deprecated api in order know how port code away it. defines += qt_deprecated_warnings  # can make code fail compile if use deprecated apis. # in order so, uncomment following line. # can select disable deprecated apis version of qt. #defines += qt_disable_deprecated_before=0x060000    # disables apis deprecated before qt 6.0.0   sources += \         main.cpp \         mainwindow.cpp \         telnet.cpp  headers += \         mainwindow.h \         telnet.h  forms += \         mainwindow.ui 

telnet.h

#ifndef telnet_h #define telnet_h  #include <qtcpsocket> #include <qtcpserver> #include <qdebug>  class telnet { public:     telnet();      void sendvalues(qstring _ip, int _port, qstring _message);  private:     qtcpsocket *socket; };  #endif // telnet_h 

normally means forgot re-run qmake