simple test connection

**dousdou** · 4th March 2011, 09:29

i like to help me to do a simple test connexion (i have a button and i like whene i cliced it take the adresse ip and do a test if it's ok it will show me "host is connected" else "host is not connected" .
so can you help me and give me the code sorce of this app plz i realy need it

**unit** · 4th March 2011, 10:30

Do you want to have button, textedit for IP input and then try connect to host with this IP?

**dousdou** · 4th March 2011, 10:33

yes this is it

**unit** · 4th March 2011, 10:54

Ok. simple example tcp connect to 80 port.

Qt Code:

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void MainWindow::on_pushButton_clicked()
{
    ui->label->setText("");
    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
    mysocket->connectToHost(ui->lineEdit->text(), 80);
}
 
void MainWindow::on_error(QAbstractSocket::SocketError socketError)
{
    ui->label->setText("Not connected " + QString::number(socketError));
}
 
void MainWindow::on_connected()
{
    ui->label->setText("It's ok. Connected");
    mysocket->disconnectFromHost();
}

void MainWindow::on_pushButton_clicked()
{
    ui->label->setText("");
    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
    mysocket->connectToHost(ui->lineEdit->text(), 80);
}

void MainWindow::on_error(QAbstractSocket::SocketError socketError)
{
    ui->label->setText("Not connected " + QString::number(socketError));
}

void MainWindow::on_connected()
{
    ui->label->setText("It's ok. Connected");
    mysocket->disconnectFromHost();
}

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**dousdou** · 4th March 2011, 11:03

realy realy thx but i have a erreur:
it told me:
QAbstractSocket::SocketError ==> is not a type name
what i sould do it ?

**unit** · 4th March 2011, 11:06

Xm, try qthelp://com.trolltech.qt.472/qdoc/qabstractsocket.html

QAbstractSocket::SocketError is not a registered metatype, so for queued connections, you will have to register it with Q_DECLARE_METATYPE() and qRegisterMetaType().

And QT demo example qthelp://com.trolltech.qt.472/qdoc/network-fortuneclient.html

**dousdou** · 4th March 2011, 12:11

he told me now:
error: â€˜myscoketâ€™ was not declared in this scope

so what i should do ?

**unit** · 4th March 2011, 20:54

Do you try attach that i do for you?

mysocket is pointer to QTcpSocket class

**dousdou** · 7th March 2011, 13:21

this time i just like when we push the button he will go to fichier .txt and get the @ ip ligne by ligne and it will do the test
i'm realy amateur in prog so plz help me

Qt Code:

Switch view

void MainWindow::on_pushButton_clicked()
{
 
 
    QFile fichier("/home/dousdou/idee.txt");
    fichier.open(QIODevice::ReadOnly);
    QString contenu = fichier.readAll();
    fichier.close();
 
 
 
 
    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
    mysocket->connectToHost(contenu, 22);
    if (mysocket->waitForConnected(1000))
         qDebug("Connected!");
 
};

void MainWindow::on_pushButton_clicked()
{


    QFile fichier("/home/dousdou/idee.txt");
    fichier.open(QIODevice::ReadOnly);
    QString contenu = fichier.readAll();
    fichier.close();




    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
    mysocket->connectToHost(contenu, 22);
    if (mysocket->waitForConnected(1000))
         qDebug("Connected!");

};

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but it doesn't work so where is the prb ?

**unit** · 7th March 2011, 13:53

Show /home/dousdou/idee.txt file or attach it, plz

**dousdou** · 7th March 2011, 15:00

it's a file text

**unit** · 7th March 2011, 15:20

Oh. idee.txt contain only one line with IP? Or several?

For several line try some code:

Qt Code:

Switch view

QStringList iplist;
while (!file.atEnd())
{
	iplist.append(file.readLine());
}
for(int i=0;i<iplist.count();++i)
{
	...
	mysocket->connectToHost(iplist.at(i), 22);
	...
}

QStringList iplist;
while (!file.atEnd())
{
	iplist.append(file.readLine());
}
for(int i=0;i<iplist.count();++i)
{
	...
	mysocket->connectToHost(iplist.at(i), 22);
	...
}

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So, you try find not firewalled SSH. it's dirty job.

Ðre you then ask as to help with software for password selection?

**dousdou** · 7th March 2011, 15:43

i push the button bute nothing is work

(((((((((((((

Qt Code:

Switch view

void MainWindow::on_pushButton_clicked()
{
 QFile file("/home/dousdou/idee.txt");
QStringList iplist;
while (!file.atEnd())
{
    iplist.append(file.readLine());
}
 
for(int i=0;i<iplist.count();++i)
{
 
 
    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
    mysocket->connectToHost(iplist.at(i), 22);
    if (mysocket->waitForConnected(1000))
         qDebug("Connected!");
}

void MainWindow::on_pushButton_clicked()
{
 QFile file("/home/dousdou/idee.txt");
QStringList iplist;
while (!file.atEnd())
{
    iplist.append(file.readLine());
}

for(int i=0;i<iplist.count();++i)
{


    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
    mysocket->connectToHost(iplist.at(i), 22);
    if (mysocket->waitForConnected(1000))
         qDebug("Connected!");
}

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**unit** · 7th March 2011, 15:55

You don't need use signal and slot if use waitForConnected

Qt Code:

Switch view

void MainWindow::on_pushButton_clicked()
{
QFile file("/home/dousdou/idee.txt");
file.open(QIODevice::ReadOnly);
QStringList iplist;
while (!file.atEnd())
{
    iplist.append(file.readLine());
}
 
for(int i=0;i<iplist.count();++i)
{
   mysocket->connectToHost(iplist.at(i), 22);
    if (mysocket->waitForConnected(1000))
         qDebug("Connected!");
    else qDebug("Error!");
}
}

void MainWindow::on_pushButton_clicked()
{
QFile file("/home/dousdou/idee.txt");
file.open(QIODevice::ReadOnly);
QStringList iplist;
while (!file.atEnd())
{
    iplist.append(file.readLine());
}

for(int i=0;i<iplist.count();++i)
{
   mysocket->connectToHost(iplist.at(i), 22);
    if (mysocket->waitForConnected(1000))
         qDebug("Connected!");
    else qDebug("Error!");
}
}

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**dousdou** · 8th March 2011, 08:29

I have done what you told me to do but also it doesn't work i know it a simple application and i realy try maney thing but always the some prb it doesn't work so when i execute your code this is what he told me:

Qt Code:

Switch view

DÃ©marrage de /home/dousdou/test2-build-desktop/test2...
QMetaObject::connectSlotsByName: No matching signal for on_connected()
QMetaObject::connectSlotsByName: No matching signal for on_error(QAbstractSocket::SocketError)
Error!
Error!
Error!
Error!

DÃ©marrage de /home/dousdou/test2-build-desktop/test2...
QMetaObject::connectSlotsByName: No matching signal for on_connected()
QMetaObject::connectSlotsByName: No matching signal for on_error(QAbstractSocket::SocketError)
Error!
Error!
Error!
Error!

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**unit** · 8th March 2011, 09:26

You try to do copy/paste and change part of code without thinking about it. You should read some manuals and src of ready code, and learn what code is do. Try new attach with full code.

I have next out:

Qt Code:

Switch view

Cann't connect to ??10.110.10.22  with error Host not found
Connected to 10.110.10.23
Connected to 10.110.10.9
Cann't connect to 10.110.10.105 with error Socket operation timed out
Cann't connect to 10.110.10.86 with error Socket operation timed out

Cann't connect to ??10.110.10.22  with error Host not found
Connected to 10.110.10.23
Connected to 10.110.10.9
Cann't connect to 10.110.10.105 with error Socket operation timed out
Cann't connect to 10.110.10.86 with error Socket operation timed out

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**dousdou** · 9th March 2011, 13:55

i just modify the code like this :

Qt Code:

Switch view

MainWindow::~MainWindow()
{
    delete ui;
    delete mysocket;
}
 
void MainWindow::on_pushButton_clicked()
{
    QFile ipfile("/home/dousdou/tech-ip.txt");
    if(!ipfile.open(QIODevice::ReadOnly))
    {
        qDebug("Can't open file");
        return;
    }
    QStringList iplist;
    while (!ipfile.atEnd())
    {
        iplist.append(ipfile.readLine());
    }
    ipfile.close();
    for(int i=0;i<iplist.count();++i)
    {
    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
     mysocket->connectToHost(iplist.at(i), 22);
}
}
void MainWindow::on_error(QAbstractSocket::SocketError socketError)
{
    QMessageBox msgBox;
        msgBox.setText("Not connected " + QString::number(socketError));
      msgBox.exec();
}
 
void MainWindow::on_connected()
{
    QMessageBox msgBox;
        msgBox.setText("It's ok. Connected");
        msgBox.exec();
    mysocket->disconnectFromHost();
}

MainWindow::~MainWindow()
{
    delete ui;
    delete mysocket;
}

void MainWindow::on_pushButton_clicked()
{
    QFile ipfile("/home/dousdou/tech-ip.txt");
    if(!ipfile.open(QIODevice::ReadOnly))
    {
        qDebug("Can't open file");
        return;
    }
    QStringList iplist;
    while (!ipfile.atEnd())
    {
        iplist.append(ipfile.readLine());
    }
    ipfile.close();
    for(int i=0;i<iplist.count();++i)
    {
    connect(mysocket,SIGNAL(connected()),this,SLOT(on_connected()));
    connect(mysocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(on_error(QAbstractSocket::SocketError)));
     mysocket->connectToHost(iplist.at(i), 22);
}
}
void MainWindow::on_error(QAbstractSocket::SocketError socketError)
{
    QMessageBox msgBox;
        msgBox.setText("Not connected " + QString::number(socketError));
      msgBox.exec();
}

void MainWindow::on_connected()
{
    QMessageBox msgBox;
        msgBox.setText("It's ok. Connected");
        msgBox.exec();
    mysocket->disconnectFromHost();
}

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and he show me this error:

Qt Code:

Switch view

QMetaObject::connectSlotsByName: No matching signal for on_connected()
QMetaObject::connectSlotsByName: No matching signal for on_error(QAbstractSocket::SocketError)
QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "10.20.24.157
"
QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "192.168.1.5
"
QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "10.20.24.155
"

QMetaObject::connectSlotsByName: No matching signal for on_connected()
QMetaObject::connectSlotsByName: No matching signal for on_error(QAbstractSocket::SocketError)
QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "10.20.24.157
"
QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "192.168.1.5
"
QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "10.20.24.155
"

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where is the rpb hier i know that's i'm not good in devlopment but plz i need your help i can work lonly and you are my last chance

**unit** · 9th March 2011, 14:22

are you kidding me?

Don't modify my CODE now. Only change path to file and try! Or tell me all your task and i try give you complete code. My Skype is unit_by

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