QObject：无法为处于不同线程中的父对象创建子对象：父对象的 thread:QThread(0x221f650)，当前的 thread:QThread(0x23a7950)

Question

我正在尝试使用 QTCpSocket (telnet) 从设备获取数据。经过一番努力后，我觉得我克服了一个 Qtimer:starttimer 无法从其他线程启动的问题。

但是，现在我遇到了另一个让我很困惑的问题。 我已经在互联网上浏览了一些 post，但它对我没有帮助。请检查我的代码并让我知道我的错误

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)
{

}

非常欢迎关于任何其他代码味道的任何其他反馈请忽略我的缩进和命名约定，因为我处于学习曲线中。 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，对象及其所有成员都在主线程中创建。然后，将 worker 移动到它自己的线程，这将移动它的所有子 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，您似乎没有为您的套接字提供父级 (_ClientSocketInstance)。这意味着套接字不会移动到与工作线程相同的线程，而是保留在主线程中，当您从插槽中使用它时会发出此警告。如果将 this 传递给 _ClientSocketInstance 构造函数以使其成为 worker 的子级，它将自动移动到与 worker 相同的线程并且警告应该消失。

QObject：无法为处于不同线程中的父对象创建子对象：父对象的 thread:QThread(0x221f650)，当前的 thread:QThread(0x23a7950)

QObject: Cannot create children for a parent that is in a different thread: parent's thread:QThread(0x221f650), current thread:QThread(0x23a7950)

qt

signals-slots

qthread

qobject

qtcpsocket