[英]qt-updating ui by thread
嗨我有一個線程更新ui的問題。 代碼工作正常,但問題是當我想移動我的窗口,因為你知道在那一刻ui線程將停止更新。 並且我的線程將值發送到停止的線程,導致錯誤。 我不知道如何解決這個問題。
這是我的線程代碼頭:
#ifndef READERTHREAD_H
#define READERTHREAD_H
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>
#include <QThread>
class readerThread : public QThread
{
Q_OBJECT
public:
explicit readerThread(QObject *parent = 0);
void run();
bool stop = false;
QByteArray port_input;
QByteArray payload;
quint8 starter_symbol = 0;
quint8 message_length = 0;
quint8 message_ID = 0;
readerThread *thread;
signals:
void updated(QByteArray , quint8);
private:
QSerialPort *serial;
};
#endif // READERTHREAD_H
我的主題.cpp:
#include "readerthread.h"
#include <QtCore>
readerThread::readerThread(QObject *parent) :
QThread(parent)
{
serial = new QSerialPort(this);
foreach (const QSerialPortInfo &serialPortInfo, QSerialPortInfo::availablePorts())
serial->setPortName(serialPortInfo.portName());
serial->setBaudRate(QSerialPort::Baud115200);
serial->setDataBits(QSerialPort::Data8);
serial->setParity(QSerialPort::NoParity);
serial->setFlowControl(QSerialPort::NoFlowControl);
serial->setStopBits(QSerialPort::OneStop);
// serial->setReadBufferSize(8192);
serial->open(QIODevice::ReadOnly);
serial->errorString();
}
void readerThread::run()
{
while(serial->isOpen())
{
port_input.append(serial->readAll());
if(port_input.count() >= 150)
{
starter_symbol = port_input.indexOf(254);
if((port_input.at(starter_symbol + 3) == 01) && (port_input.at(starter_symbol + 4) == 01))
{
message_length = port_input.at(starter_symbol + 1);
message_ID = port_input.at(starter_symbol + 5);
payload = port_input.mid(starter_symbol + 6 , message_length);
port_input.remove(starter_symbol , message_length + 8);
emit updated(payload , message_ID);
}
port_input.remove(0 , starter_symbol);
}
}
}
在這里我的mainwindow.cpp簡而言之:
struct mavlink_attitude_t
{
/// <summary> Timestamp (milliseconds since system boot) </summary>
quint32 time_boot_ms;
/// <summary> Roll angle (rad, -pi..+pi) </summary>
float roll;
/// <summary> Pitch angle (rad, -pi..+pi) </summary>
float pitch;
/// <summary> Yaw angle (rad, -pi..+pi) </summary>
float yaw;
/// <summary> Roll angular speed (rad/s) </summary>
float rollspeed;
/// <summary> Pitch angular speed (rad/s) </summary>
float pitchspeed;
/// <summary> Yaw angular speed (rad/s) </summary>
float yawspeed;
};
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
thread = new readerThread(this);
connect(thread , SIGNAL(updated(QByteArray,quint8)) , this , SLOT(onUpdate(QByteArray,quint8)));
thread->start();
}
void MainWindow::onUpdate(QByteArray payload , quint8 ID)
{
mavlink_attitude_t data;
memcpy(&data,payload.data(),sizeof(mavlink_attitude_t));
ui->timebootms->setText(QString::number(data.time_boot_ms));
ui->roll->setText(QString::number(data.roll));
ui->pitch->setText(QString::number(data.pitch));
ui->yaw->setText(QString::number(data.yaw));
ui->rollspeed->setText(QString::number(data.rollspeed));
ui->pitchspeed->setText(QString::number(data.pitchspeed));
ui->yawspeed->setText(QString::number(data.yawspeed));
}
您可能會遇到我們在5.5版本之前修復過的問題:
如果您願意,可以向后移動更改。
更重要的是,當庫被設計為具有異步API時,自己使用線程是相對奇怪的。 我當時寫了一個簡單的例子,它演示了用於讀取目的的庫的正確異步使用。 你在這里找到它:
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