Sending Data from Client to Server
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My server.cpp file is,
#include "server.h" Server::Server(QObject *parent) : QObject(parent) { tcpServer = new QTcpServer(); connect(tcpServer,&QTcpServer::newConnection,this,&Server::newConnection); initServer(); } void Server::incomingConnection(int socketfd){ // clientConnection=new QTcpSocket(this); clientConnection = tcpServer->nextPendingConnection(); connect(clientConnection, &QAbstractSocket::disconnected, clientConnection, &QObject::deleteLater); // client->setSocketDescriptor(socketfd); // clients.insert(client); qDebug() << "New client from: " << clientConnection->peerAddress().toString(); connect(clientConnection,SIGNAL(readyRead()),this,SLOT(readyRead())); connect(clientConnection,SIGNAL(disconnected()),this,SLOT(disconnected())); } void Server::newConnection(){ qDebug() << "-------NEW CONNECTION SLOT--------"; // QByteArray block; // QDataStream out(&block, QIODevice::ReadWrite); // out.setVersion(QDataStream::Qt_5_9); // out << "ABCderfHt"; clientConnection->write("ABCDE"); //clientConnection->disconnectFromHost(); } void Server::readyRead(){ qDebug() << "|||||||||||READYREAD SLOT--------"; qDebug() << clientConnection->readAll(); } void Server::disconnected(){ qDebug() << "//////////DISCONNECTED CONNECTION SLOT--------"; } void Server::initServer(){ if (!tcpServer->listen(QHostAddress::Any,45442)) { qDebug() << tcpServer->errorString(); } else{ qDebug() << "Listening"; } }My server.h file is,
#ifndef SERVER_H #define SERVER_H #include <QObject> #include <QTcpServer> #include <QTcpSocket> #include <QDebug> #include <QDataStream> #include <QByteArray> #include <QNetworkInterface> #include <QAbstractSocket> class Server : public QObject { Q_OBJECT public: explicit Server(QObject *parent = nullptr); QTcpServer *tcpServer = nullptr; void initServer(); QTcpSocket *clientConnection; // QDataStream out; protected: void incomingConnection(int socketfd); public slots: void newConnection(); void readyRead(); void disconnected(); private: QSet<QTcpSocket*> clients; }; #endif // SERVER_HThe main.cpp on the server side,
#include <QCoreApplication> #include "server.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); Server server; return a.exec(); }My client.cpp is,
#include "client.h" Client::Client() { tcpSocket = new QTcpSocket(); tcpSocket->connectToHost(QHostAddress::LocalHost,45442); //connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(displayError(QAbstractSocket::SocketError))); // connect(tcpSocket,QOverload<QAbstractSocket::SocketError>::of(error),this,&Client::displayError); connect(tcpSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), [=](QAbstractSocket::SocketError socketError){ switch(socketError){ case QAbstractSocket::RemoteHostClosedError: break; case QAbstractSocket::HostNotFoundError: qDebug() << "HostNotFoundError. Connection was refused. Server is not working"; break; case QAbstractSocket::ConnectionRefusedError: qDebug() << "ConnectionRefusedError. Client. The host was not found"; break; default: qDebug() << "ErrorString : " << tcpSocket->errorString(); } }); connect(tcpSocket, &QTcpSocket::connected, this, &Client::sendMessageToServer); connect(tcpSocket,&QTcpSocket::readyRead, this, &Client::readyRead); } void Client::displayError(QAbstractSocket::SocketError socketError){ switch(socketError){ case QAbstractSocket::RemoteHostClosedError: break; case QAbstractSocket::HostNotFoundError: qDebug() << "HostNotFoundError. Connection was refused. Server is not working"; break; case QAbstractSocket::ConnectionRefusedError: qDebug() << "ConnectionRefusedError. Client. The host was not found"; break; default: qDebug() << "ErrorString : " << tcpSocket->errorString(); } } void Client::sendMessageToServer(){ qDebug() << "INSIDe sendMessageToServer"; //tcpSocket->waitForReadyRead(); qDebug() << tcpSocket->canReadLine() << tcpSocket->readAll(); tcpSocket->write("MessageFromClient"); //tcpSocket->flush(); } void Client::readyRead(){ qDebug() << "///READYREAD SLOT///"; // in.startTransaction(); // QString nextFortune; // in >> nextFortune; // if (!in.commitTransaction()) // return; qDebug() << tcpSocket->readAll(); }My client.h is,
#ifndef CLIENT_H #define CLIENT_H #include <QObject> #include <QTcpServer> #include <QTcpSocket> #include <QDebug> #include <QDataStream> #include <QByteArray> #include <QNetworkInterface> #include <QAbstractSocket> class Client : public QTcpSocket { public: Client(); QTcpSocket *tcpSocket = nullptr; QDataStream in; public slots: void displayError(QAbstractSocket::SocketError socketError); void sendMessageToServer(); void readyRead(); }; #endif // CLIENT_HThe main.cpp on the client side is,
#include <QCoreApplication> #include "client.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); Client client; return a.exec(); }@star673 said in Sending Data from Client to Server:
void Server::incomingConnection(int socketfd){
If you check the documentation you will see that incomingConnection is a protected virtual method in QTcpServer. If you want to use it you have to subclass QTcpServer and override it. But if you use QTcpServer::newConnection signal there is no need for incomingConnection - simply move the code from your incomingConnection to newConnection.
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@star673 said in Sending Data from Client to Server:
void Server::incomingConnection(int socketfd){
If you check the documentation you will see that incomingConnection is a protected virtual method in QTcpServer. If you want to use it you have to subclass QTcpServer and override it. But if you use QTcpServer::newConnection signal there is no need for incomingConnection - simply move the code from your incomingConnection to newConnection.
Thank you for helping, it worked like below.
#include "server.h" Server::Server(QObject *parent) : QObject(parent) { tcpServer = new QTcpServer(); connect(tcpServer,&QTcpServer::newConnection,this,&Server::newConnection); initServer(); timer = new QTimer(this); } void Server::newConnection(){ qDebug() << "-------NEW CONNECTION SLOT--------"; clientConnection = tcpServer->nextPendingConnection(); connect(clientConnection, &QAbstractSocket::disconnected, clientConnection, &QObject::deleteLater); qDebug() << "New client from: " << clientConnection->peerAddress().toString(); connect(clientConnection,&QAbstractSocket::readyRead,this,&Server::readyRead); connect(clientConnection,&QAbstractSocket::disconnected,this,&Server::disconnected); clientConnection->write("ABCDEFFGHJKL"); connect(timer,&QTimer::timeout,this,&Server::TimerSlot); timer->start(1000); } void Server::readyRead(){ qDebug() << "|||||||||||READYREAD SLOT--------"; qDebug() << "||||||||" << clientConnection->readAll(); } void Server::disconnected(){ qDebug() << "//////////DISCONNECTED CONNECTION SLOT--------"; } void Server::initServer(){ if (!tcpServer->listen(QHostAddress::Any,45442)) { qDebug() << tcpServer->errorString(); } else{ qDebug() << "Listening"; } } void Server::TimerSlot(){ clientConnection->write("ABCDEFFGHJKL"); }The client side is,
#include "client.h" Client::Client() { tcpSocket = new QTcpSocket(); tcpSocket->connectToHost(QHostAddress::LocalHost,45442); connect(tcpSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), [=](QAbstractSocket::SocketError socketError){ switch(socketError){ case QAbstractSocket::RemoteHostClosedError: break; case QAbstractSocket::HostNotFoundError: qDebug() << "HostNotFoundError. Connection was refused. Server is not working"; break; case QAbstractSocket::ConnectionRefusedError: qDebug() << "ConnectionRefusedError. Client. The host was not found"; break; default: qDebug() << "ErrorString : " << tcpSocket->errorString(); } }); connect(tcpSocket, &QTcpSocket::connected, this, &Client::sendMessageToServer); connect(tcpSocket,&QTcpSocket::readyRead, this, &Client::readyRead); timer = new QTimer(this); } void Client::displayError(QAbstractSocket::SocketError socketError){ switch(socketError){ case QAbstractSocket::RemoteHostClosedError: break; case QAbstractSocket::HostNotFoundError: qDebug() << "HostNotFoundError. Connection was refused. Server is not working"; break; case QAbstractSocket::ConnectionRefusedError: qDebug() << "ConnectionRefusedError. Client. The host was not found"; break; default: qDebug() << "ErrorString : " << tcpSocket->errorString(); } } void Client::sendMessageToServer(){ qDebug() << "INSIDe sendMessageToServer"; qDebug() << tcpSocket->canReadLine() << tcpSocket->readAll(); tcpSocket->write("MessageFromClient"); connect(timer,&QTimer::timeout,this,&Client::TimerSlotClient); timer->start(1000); } void Client::readyRead(){ qDebug() << "///READYREAD SLOT///"; qDebug() << tcpSocket->readAll(); } void Client::TimerSlotClient(){ tcpSocket->write("MessageFromClient"); }
