Question

我正在尝试使用QTCpSocket（telnet）从设备获取数据。经过很多努力，我觉得我克服了一个问题，即Qtimer：starttimer无法从其他线程启动。

但是，现在我遇到了另一个使我感到困惑的问题。 我已经在互联网上浏览过一些帖子，但这并没有帮助我。请检查我的代码，让我知道我的错误

fdu.cpp

#include "fdu.h"
#include "ui_fdu.h"
#include"fduprocess.h"
fdu::fdu(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::fdu)
{
    ui->setupUi(this);
    QThread *workerThread =  new QThread;
    fduprocess *worker = new fduprocess;

 qDebug()<< "...goind to fduprocess........";
    workerThread->start();
    worker->_ReconnectionTimerInstance.setSingleShot(true);
    worker->_ReconnectionTimerInstance.start(1000);
    worker->_iStatusPollTimer = startTimer(500);
    worker->moveToThread(workerThread);
    connect(workerThread,SIGNAL(started()),worker,SLOT(tryit()));
    connect(workerThread,SIGNAL(finished()),worker,SLOT(deleteLater()));

}

fdu::~fdu()
{
    delete ui;
}

fduprocess.cpp

#include "fduprocess.h"
#include<QDebug>
#include<QThread>
fduprocess::fduprocess(QObject *parent) : QObject(parent)
{

}

void fduprocess::timerEvent(QTimerEvent *event)
{
    if(event->timerId()== _iStatusPollTimer)
    {

        if(_ClientSocketInstance.state() == QAbstractSocket::ConnectedState)
        {
            _ClientSocketInstance.write("alarmstat\r\n"); //25
             _ClientSocketInstance.write("selectedin\r\n"); // 4
              _ClientSocketInstance.write("sigoutstat\r\n"); //13
           _ClientSocketInstance.write("disablestat\r\n"); //5

           _ClientSocketInstance.write("pwrstat\r\n"); //5

           _ClientSocketInstance.write("siginstat\r\n");//5
        }
    }
}

void fduprocess::tryit()
{
 qDebug()<< "...came inside tryit to tryit.........";
 connect(&_ReconnectionTimerInstance,SIGNAL(timeout()), this, SLOT(when_ReconnectionTimer_timeout()));
  qDebug()<< "...conencted to whentimeout.........";
 connect(&_ClientSocketInstance,SIGNAL(connected()), this, SLOT(when_ClientSocketInstance_connected()));
 connect(&_ClientSocketInstance,SIGNAL(disconnected()), this, SLOT(when_ClientSocketInstance_disconnected()));
 connect(&_ClientSocketInstance,SIGNAL(readyRead()), this, SLOT(when_ClientSocketInstance_readyRead()));
 connect(&_ClientSocketInstance,SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(when_ClientSocketInstance_error(QAbstractSocket::SocketError)));
 _strIPAddress = "192.168.1.135";
 _usiPort = 23;
  qDebug()<< "...end tryit........";


}

void fduprocess::doOntimeout()
{
    qDebug()<< "................";
}

void fduprocess::when_ReconnectionTimer_timeout()
{
    qDebug()<<"Reconnecting..";
      // qDebug()<< _ClientSocketInstance.children();
        _ClientSocketInstance.connectToHost(_strIPAddress, _usiPort);
}

void fduprocess::when_ClientSocketInstance_connected()
{ qDebug()<<"Connected......";

    _ClientSocketInstance.write("endrun_1");
    _ClientSocketInstance.flush();
    _ClientSocketInstance.write("\n");
    _ClientSocketInstance.write("\n");
    _ClientSocketInstance.write("\n");
    _ClientSocketInstance.flush();

}

void fduprocess::when_ClientSocketInstance_disconnected()
{
    qDebug()<<"Disconnected";
        _ReconnectionTimerInstance.start();
}

void fduprocess::when_ClientSocketInstance_readyRead()
{
    QByteArray get = _ClientSocketInstance.readLine();
    qDebug() << get ;
}

void fduprocess::when_ClientSocketInstance_error(QAbstractSocket::SocketError error)
{

}

我们非常欢迎您对任何其他代码气味的其他反馈因为我处于学习曲线中，所以请忽略我的缩进和命名约定。 这是控制台输出：

...goind to fduprocess........
...came inside tryit to tryit.........
...conencted to whentimeout.........
...end tryit........
Reconnecting..
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QTcpSocket(0x609250), parent's thread is QThread(0x221f650), current thread is QThread(0x23a7950)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QTcpSocket(0x609250), parent's thread is QThread(0x221f650), current thread is QThread(0x23a7950)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QTcpSocket(0x609250), parent's thread is QThread(0x221f650), current thread is QThread(0x23a7950)

Answer 1

创建worker时，将在主线程中创建对象及其所有成员。然后，将worker移动到其自己的线程，该线程将移动其所有子QObject。 worker中的所有插槽现在都将在此新线程上执行。

从fduprocess构造函数看来，您没有给套接字（_ClientSocketInstance）赋予父项。这意味着套接字不会与工作线程移到同一线程，而是停留在主线程中，当您从插槽中使用它时会发出此警告。如果将this传递给_ClientSocketInstance构造函数使其成为worker的子代，它将自动移至与worker相同的线程，并且警告应消失。

QObject：无法为处于不同线程中的父级创建子级：父级线程：QThread（0x221f650），当前线程：QThread（0x23a7950）

1 个答案: