Split a qstring and put the fragments in an array

[fantom]

Dear all,

I implemented a simple chat server in order to receive a msg from a device. The msg is a string and i would like to tokenize it in order to put the pieces of it to my sql database. Could somebody send me a code example how this can be done?

Thank you in advance!

#include "simplechatserver.h"
#include <QBuffer>
#include <QByteArray>
#include <QString>
#include <QTcpSocket>
#include <QStringList>
#include <iostream>
 
SimpleChatServer::SimpleChatServer(QObject* parent) : QTcpServer(parent)
{
	std::cout << "Message server started" << std::endl;
	connect(this, SIGNAL(newConnection()), this, SLOT(addConnection()));
}
 
SimpleChatServer::~SimpleChatServer()
{
}
 
void SimpleChatServer::addConnection()
{
	std::cout <<"new incomming connection" << std::endl;
	QTcpSocket* connection = nextPendingConnection();
	connections.append(connection);
	QBuffer* buffer = new QBuffer(this);
	buffer->open(QIODevice::ReadWrite);
	buffers.insert(connection, buffer);
	connect(connection, SIGNAL(disconnected()), SLOT(removeConnection()));
	connect(connection, SIGNAL(readyRead()),	SLOT(receiveMessage()));
}
 
void SimpleChatServer::removeConnection()
{
	std::cout << "removing connection "<< std::endl;
	QTcpSocket* socket = static_cast<QTcpSocket*>(sender());
	QBuffer* buffer = buffers.take(socket);
	buffer->close();
	buffer->deleteLater();
	connections.removeAll(socket);
	socket->deleteLater();
}
 
void SimpleChatServer::receiveMessage()
{
	std::cout << "receiving" <<std::endl;
	QTcpSocket* socket = static_cast<QTcpSocket*>(sender());
	QBuffer* buffer = buffers.value(socket);
 
	// missing some checks for returns values for the sake of simplicity
	qint64 bytes = buffer->write(socket->readAll());
	// go back as many bytes as we just wrote so that it can be read
	buffer->seek(buffer->pos() - bytes);
 
 
//	while(buffer->canReadLine())
	{
	line = buffer->readLine();
	QString str(line.data());
	std::cout << str.toStdString() << std::endl;
 
 
	QStringList list[] = {str.split(QRegExp(" "), QString::SkipEmptyParts)};   ????????????
	//std::cout<< list.<<std::endl;                                                        ???????????
 
 
 
	emit emitMessage(str);
 
 
	}
}

#include "simplechatserver.h"
#include <QBuffer>
#include <QByteArray>
#include <QString>
#include <QTcpSocket>
#include <QStringList>
#include <iostream>

SimpleChatServer::SimpleChatServer(QObject* parent) : QTcpServer(parent)
{
	std::cout << "Message server started" << std::endl;
	connect(this, SIGNAL(newConnection()), this, SLOT(addConnection()));
}

SimpleChatServer::~SimpleChatServer()
{
}

void SimpleChatServer::addConnection()
{
	std::cout <<"new incomming connection" << std::endl;
	QTcpSocket* connection = nextPendingConnection();
	connections.append(connection);
	QBuffer* buffer = new QBuffer(this);
	buffer->open(QIODevice::ReadWrite);
	buffers.insert(connection, buffer);
	connect(connection, SIGNAL(disconnected()), SLOT(removeConnection()));
	connect(connection, SIGNAL(readyRead()),	SLOT(receiveMessage()));
}

void SimpleChatServer::removeConnection()
{
	std::cout << "removing connection "<< std::endl;
	QTcpSocket* socket = static_cast<QTcpSocket*>(sender());
	QBuffer* buffer = buffers.take(socket);
	buffer->close();
	buffer->deleteLater();
	connections.removeAll(socket);
	socket->deleteLater();
}

void SimpleChatServer::receiveMessage()
{
	std::cout << "receiving" <<std::endl;
	QTcpSocket* socket = static_cast<QTcpSocket*>(sender());
	QBuffer* buffer = buffers.value(socket);
	
	// missing some checks for returns values for the sake of simplicity
	qint64 bytes = buffer->write(socket->readAll());
	// go back as many bytes as we just wrote so that it can be read
	buffer->seek(buffer->pos() - bytes);


//	while(buffer->canReadLine())
	{
	line = buffer->readLine();
	QString str(line.data());
	std::cout << str.toStdString() << std::endl;

	
	QStringList list[] = {str.split(QRegExp(" "), QString::SkipEmptyParts)};   ????????????
	//std::cout<< list.<<std::endl;                                                        ???????????



	emit emitMessage(str);

	
	}
}

To copy to clipboard, switch view to plain text mode 

[Lykurg]

Just skip the brackets:

QStringList list = str.split(" ", QString::SkipEmptyParts);

QStringList list = str.split(" ", QString::SkipEmptyParts);

To copy to clipboard, switch view to plain text mode 

[fantom]

Thank you very much!
I would like to ask something more concerning the handling of this list. I did the following but is also not correct.
I have the str= "15:12:00 milk"

unsigned int hour, object;
QString text;
 
QStringList list = str.split(" ", QString::SkipEmptyParts);
 
 
 
if (list.count() != 2)
 
 
 
text = list[1];
 
l = QStringList::split(':', list[0]);
 
hour   = list[0].toUInt();
object= list[1].toUInt();

unsigned int hour, object;
QString text;

QStringList list = str.split(" ", QString::SkipEmptyParts);



if (list.count() != 2)



text = list[1];

l = QStringList::split(':', list[0]);

hour   = list[0].toUInt();
object= list[1].toUInt();

To copy to clipboard, switch view to plain text mode 

[Lykurg]

Let me ask a question: How long do you deal with C++? And to your problem: What's the difference between

str.split(...);

str.split(...);

To copy to clipboard, switch view to plain text mode 

and

QStringList::split(...);

QStringList::split(...);

To copy to clipboard, switch view to plain text mode 

?

[fantom]

I am sorry but i am learning since one year now c++ and i am still doing basic mistakes.

In the code instead of list = str.split(':', list[0]); i wrote l = QStringList::split(':', list[0]);.

Could you please help me on how i should handle this?

[wysota]

Take a look at this code:

l = QStringList::split(a,b);

l = QStringList::split(a,b);

To copy to clipboard, switch view to plain text mode 

Could you point me to the place in Qt docs where this method is documented?