How does QTcpSocket write data to client? - qt

Question

I wanna make a simple Qt app which can perform task like image below:
I have learnt Fortune Server examples and actually I want this app is just like the combination of Fortune Server and Fortune Client.
dialog.cpp
void Dialog::on_btnListen_clicked(bool checked)
{
if(checked)
{
listener = new ServerSock(this);
if(!listener->listen(QHostAddress::LocalHost,ui->boxPort->value()))
{
QMessageBox::critical(this,tr("Error"),tr("Cannot listen: %1").arg(listener->errorString()));
ui->btnListen->setChecked(false);
return;
}
else
{
qDebug() << "Server is listening to port" << listener->serverPort();
ui->btnListen->setText(tr("Listening"));
this->setWindowTitle(tr("Listening and Running"));
}
}
else
{
listener->close();
listener->deleteLater();
ui->tmbListen->setText(tr("Listen again"));
this->setWindowTitle(tr("Taking a rest"));
}
}
serversock.cpp:
#include "serversock.h"
ServerSock::ServerSock(QObject *parent) :
QTcpServer(parent)
{
}
void ServerSock::incomingConnection(int descriptor)
{
thread = new Threading(descriptor,this);
connect(thread,SIGNAL(finished()),thread,SLOT(deleteLater()));
thread->start();
}
threading.cpp:
#include "threading.h"
Threading::Threading(int descriptor, QObject *parent) :
QThread(parent)
{
this->descriptorSocket = descriptor;
}
void Threading::run()
{
qDebug() << "Thread is started...";
socketThread = new QTcpSocket();
if(!socketThread->setSocketDescriptor(this->descriptorSocket))
{
emit error(socketThread->error());
return;
}
connect(socketThread,SIGNAL(readyRead()),this,SLOT(readyToRead()),Qt::DirectConnection);
connect(socketThread,SIGNAL(disconnected()),this,SLOT(unconnected()),Qt::DirectConnection);
qDebug() << descriptorSocket << "Connected";
exec(); //loop
}
void Threading::readyToRead()
{
QByteArray data = socketThread->readAll();
socketOut = new QTcpSocket();
socketOut->connectToHost("192.168.0.1",8080);
if(socketOut->waitForConnected(5000))
{
QByteArray query("GET http:// mysite. com/page HTTP/1.1\r\nHost: anothersite.com\r\r\r\n" + data); //example
socketOut->write(query);
socketOut->write("\r\r\r\n");
socketOut->waitForBytesWritten(1000);
socketOut->waitForReadyRead(3000);
outPut = socketOut->readAll();
if(socketOut->error() != socketOut->UnknownSocketError)
{
qDebug() << socketOut->errorString();
socketOut->disconnectFromHost();
this->quit();
socketThread->abort();
}
else
{
socketOut->close();
}
}
else
{
qDebug() << "Cannot connected";
}
if(!outPut.isNull())
socketThread->write(outPut);
qDebug() << descriptorSocket << " Data in: " << data;
void Threading::unconnected()
{
qDebug() << "Disconnected";
socketThread->abort();
exit(0);
deleteLater();
}
The problem is that I don't know how to return data from remote host to the local client, like the image below:
it sends request, but there is no response. How to accomplish this?