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C++ (Qt)
int main(int argc, char *argv[])
{
    if(!server.listen(QHostAddress::Any, 6178)){
        cerr << "Failed to bind to port" << endl;
        return 1;
    }
    else
         a.quit();				// Это ты для чего вызываешь?
    return a.exec();
}
 

C++ (Qt)
int main(int argc, char *argv[])
{
    if(!server.listen(QHostAddress::Any, 6178)){
        cerr << "Failed to bind to port" << endl;			// А это тогда что делает???
        return 1;
    }
    else
         a.quit();
    return a.exec();
}
 

C++ (Qt)
Running build steps for project Server...
Starting: C:/Qt/2009.04/qt/bin/qmake.exe C:/Server/Server.pro -spec win32-g++ -r 
Exited with code 0.
Starting: C:/Qt/2009.04/mingw/bin/mingw32-make.exe -w 
mingw32-make: Entering directory `C:/Server'
C:/Qt/2009.04/mingw/bin/mingw32-make -f Makefile.Release
mingw32-make[1]: Entering directory `C:/Server'
g++ -c -O2 -frtti -fno-exceptions -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_NO_DEBUG -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I"..\Qt\2009.04\qt\include\QtCore" -I"..\Qt\2009.04\qt\include\QtNetwork" -I"..\Qt\2009.04\qt\include" -I"..\Qt\2009.04\qt\include\ActiveQt" -I"release" -I"..\Qt\2009.04\qt\mkspecs\win32-g++" -o release\main.o main.cpp
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-s -Wl,-subsystem,console -o release\Server.exe release/main.o -L"c:\Qt\2009.04\qt\lib" -lQtNetwork -lQtCore -lkernel32 -luser32 -lshell32 -luuid -lole32 -ladvapi32 -lws2_32
mingw32-make[1]: Leaving directory `C:/Server'
mingw32-make: Leaving directory `C:/Server'
release/main.o:main.cpp:(.text+0x1b): undefined reference to `vtable for TripServer'
release/main.o:main.cpp:(.text+0x4b): undefined reference to `vtable for TripServer'
release/main.o:main.cpp:(.text+0x7b): undefined reference to `vtable for ClientSocket'
release/main.o:main.cpp:(.text+0xfb): undefined reference to `vtable for ClientSocket'
release/main.o:main.cpp:(.text+0x61f): undefined reference to `vtable for TripServer'
release/main.o:main.cpp:(.text+0x64b): undefined reference to `vtable for TripServer'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [release\Server.exe] Error 1
mingw32-make: *** [release] Error 2
Exited with code 2.
Error while building project Server
When executing build step 'Make'
 

C++ (Qt)
void ClientSocket::readClient()
{
    QDataStream in(this);
     in.setVersion(QDataStream::Qt_4_5);
 
    // А этот код что делает?
    if (nextBlockSize == 0)
    {
        if(bytesAvailable() < sizeof(quint16))
            return;
        in >> nextBlockSize;
    }
 
    // А этот.... ?
    if(bytesAvailable() < nextBlockSize)
        return;
 

C++ (Qt)
#include <QCoreApplication>
#include <QTcpSocket>
#include <QTcpServer>
#include <iostream>
using namespace std;
 
class TripServer : public QTcpServer
{
    Q_OBJECT
 
    public:
    TripServer(QObject *parent = 0);
    private:
    void incomingConnection(int socketId);
};
TripServer::TripServer(QObject *parent)
        :QTcpServer(parent)
{
}
class ClientSocket : public QTcpSocket
{
    Q_OBJECT
 
    public:
    ClientSocket(QObject *parent = 0);
    private slots:
    void readClient();
 
};
 
ClientSocket::ClientSocket(QObject *parent)
        :QTcpSocket(parent)
{
    connect(this, SIGNAL(readyRead()), this, SLOT(readClient()));
    connect(this, SIGNAL(disconnected()), this, SLOT(deleteLater()));
    //nextBlockSize = 0;
}
void TripServer::incomingConnection(int socketID)
{
    ClientSocket *socket = new ClientSocket(this);
    socket->setSocketDescriptor(socketID);
}
 
void ClientSocket::readClient()
{
    QByteArray block;
    int i;
    QDataStream in(this);
    in.setVersion(QDataStream::Qt_4_5);
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_5);
    in >> i;
    if (i == 1)
    {    block = "n";
        out << block;
    }
    else
    {
        block = "y";
        out << block;
        close();
    }
}
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    TripServer server;
    if(!server.listen(QHostAddress::Any, 6178)){
        cerr << "Failed to bind to port" << endl;
        return 1;
    }
    else
         a.quit();
    return a.exec();
}
 
#include "main.moc"
 

C++ (Qt)
#include <QCoreApplication>    
#include <QTcpSocket>          
#include <QTcpServer>          
#include <QDebug>              
 
class TripServer : public QTcpServer
{                                   
    Q_OBJECT                        
public:                             
    TripServer( QObject *parent = 0 ) : QTcpServer( parent ) {}
 
private:
    void incomingConnection( int socketId );
};                                          
 
class ClientSocket : public QTcpSocket
{                                     
    Q_OBJECT                          
public:                               
    ClientSocket(QObject *parent = 0);
 
private slots:
    void readClient();
};                    
 
void TripServer::incomingConnection( int socketID )
{                                                  
    ClientSocket *socket = new ClientSocket( this );
    socket->setSocketDescriptor( socketID );        
}                                                   
 
ClientSocket::ClientSocket( QObject *parent )
    : QTcpSocket( parent )                   
{                                            
    connect( this, SIGNAL( readyRead() ), this, SLOT( readClient() ) );
    connect( this, SIGNAL( disconnected() ), this, SLOT( deleteLater() ) );
}
 
 
void ClientSocket::readClient()
{
    quint16 id;
    QDataStream in( this );
    in.setVersion(QDataStream::Qt_4_5);
    if( (int)bytesAvailable() < sizeof( quint16 ) )
        return;
 
    in >> id;
    qDebug() << id;
 
    if( id == 8 )
        qDebug() << "Yaa hoo!!!"
}
 
int main( int argc, char *argv[] )
{
    QCoreApplication app( argc, argv );
 
    TripServer server;
    if( !server.listen( QHostAddress::Any, 6178 ) )
    {
        qDebug() << "Failed to bind to port";
        return 1;
    }
 
    return app.exec();
}
 
#include "main.moc"
 

C++ (Qt)
#include <QCoreApplication>
#include <QTcpSocket>
#include <QDebug>
 
int main( int argc, char *argv[] )
{
    QCoreApplication app( argc, argv );
 
    QTcpSocket socket;
    socket.connectToHost( "localhost", 6178 );
    if( !socket.waitForConnected( 1000 ) )
    {
         qDebug( "Error host connected!" );
         return 1;
    }
 
    qDebug( "Connected!" );
 
    quint16 key = 8;
 
    QByteArray buf;
    QDataStream out( &buf, QIODevice::WriteOnly );
    out << key;
 
    qDebug() << "Send key";
    socket.write( buf );
    socket.flush();
 
    return 0;
}
 

C++ (Qt)
QStringList lines;
while(tcpSocket.canReadLine())
       lines.append(tcpSocket.readLine());