IP打印机控制

头文件
#include “QTcpSocket”
#include ”QHostAddress“

源文件

void MainWindow::TcpPrint(QString IP,QString command)
{
QHostAddress testIP;
if (!testIP.setAddress(IP))
{
qDebug()<<"Invalid IP Address.";
return;
}
QTcpSocket *tcpSocket = new QTcpSocket();
tcpSocket->connectToHost(QHostAddress(
QString::fromStdString(IP.toStdString()) ), 9100);

qDebug()<<"Connect to :"+IP+" Status:"<state();
// State: 2; 2 QAbstractSocket::ConnectingState， 3 （QAbstractSocket::ConnectedState)

const int Timeout=5*1000;

if(!tcpSocket->waitForConnected(Timeout)) return;

if (tcpSocket->state()==QAbstractSocket::ConnectedState)
{
qDebug()<<"Connected:"+IP+" Status:"<state();
tcpSocket->write(code->fromUnicode(command));
tcpSocket->waitForBytesWritten(3000);// after waitForBytesWritten() ，QTcpSocket send data
}
else
{
qDebug()<< IP +" NOT connected!";
}
delete tcpSocket;
}

编程记录