QT blockingmaster例子学习
2024-09-06 02:29:48
dialog.h:
#ifndef DIALOG_H
#define DIALOG_H #include <QDialog> #include "masterthread.h"
//这里的写法有点。。为什么不直接加头文件
QT_BEGIN_NAMESPACE class QLabel;
class QLineEdit;
class QSpinBox;
class QPushButton;
class QComboBox; QT_END_NAMESPACE class Dialog : public QDialog
{
Q_OBJECT public:
explicit Dialog(QWidget *parent = nullptr); private slots:
void transaction();
void showResponse(const QString &s);
void processError(const QString &s);
void processTimeout(const QString &s); private:
void setControlsEnabled(bool enable); private:
int transactionCount;
QLabel *serialPortLabel; //声明了各类控件
QComboBox *serialPortComboBox;
QLabel *waitResponseLabel;
QSpinBox *waitResponseSpinBox;
QLabel *requestLabel;
QLineEdit *requestLineEdit;
QLabel *trafficLabel;
QLabel *statusLabel;
QPushButton *runButton; MasterThread thread; //创建了一个线程类
}; #endif // DIALOG_H
masterthread.h:
#ifndef MASTERTHREAD_H
#define MASTERTHREAD_H #include <QThread>
#include <QMutex>
#include <QWaitCondition> //! [0]
class MasterThread : public QThread
{
Q_OBJECT public:
explicit MasterThread(QObject *parent = nullptr);
~MasterThread(); void transaction(const QString &portName, int waitTimeout, const QString &request); //用来传递GUI界面的信息函数
void run() Q_DECL_OVERRIDE; //线程运行函数 signals:
void response(const QString &s); //一些信号:响应、错误、时间
void error(const QString &s);
void timeout(const QString &s); private:
QString portName; //需要操作记录的私有变量
QString request;
int waitTimeout;
QMutex mutex; //互斥锁,保护上面的私有变量
QWaitCondition cond; //条件变量,用来同步
bool quit;
};
//! [0] #endif // MASTERTHREAD_H
dialog.cpp:
#include "dialog.h" #include <QLabel>
#include <QLineEdit>
#include <QComboBox>
#include <QSpinBox>
#include <QPushButton>
#include <QGridLayout> #include <QtSerialPort/QSerialPortInfo> QT_USE_NAMESPACE Dialog::Dialog(QWidget *parent)
: QDialog(parent)
, transactionCount()
, serialPortLabel(new QLabel(tr("Serial port:")))
, serialPortComboBox(new QComboBox())
, waitResponseLabel(new QLabel(tr("Wait response, msec:")))
, waitResponseSpinBox(new QSpinBox())
, requestLabel(new QLabel(tr("Request:")))
, requestLineEdit(new QLineEdit(tr("Who are you?")))
, trafficLabel(new QLabel(tr("No traffic.")))
, statusLabel(new QLabel(tr("Status: Not running.")))
, runButton(new QPushButton(tr("Start")))
{
const auto infos = QSerialPortInfo::availablePorts();
for (const QSerialPortInfo &info : infos)
serialPortComboBox->addItem(info.portName()); waitResponseSpinBox->setRange(, );
waitResponseSpinBox->setValue(); auto mainLayout = new QGridLayout;
mainLayout->addWidget(serialPortLabel, , );
mainLayout->addWidget(serialPortComboBox, , );
mainLayout->addWidget(waitResponseLabel, , );
mainLayout->addWidget(waitResponseSpinBox, , );
mainLayout->addWidget(runButton, , , , );
mainLayout->addWidget(requestLabel, , );
mainLayout->addWidget(requestLineEdit, , , , );
mainLayout->addWidget(trafficLabel, , , , );
mainLayout->addWidget(statusLabel, , , , );
setLayout(mainLayout); setWindowTitle(tr("Blocking Master"));
serialPortComboBox->setFocus(); connect(runButton, &QPushButton::clicked, this, &Dialog::transaction);
connect(&thread, &MasterThread::response, this, &Dialog::showResponse);
connect(&thread, &MasterThread::error, this, &Dialog::processError);
connect(&thread, &MasterThread::timeout, this, &Dialog::processTimeout);
} void Dialog::transaction()
{
setControlsEnabled(false);
statusLabel->setText(tr("Status: Running, connected to port %1.")
.arg(serialPortComboBox->currentText()));
thread.transaction(serialPortComboBox->currentText(),
waitResponseSpinBox->value(),
requestLineEdit->text());
} void Dialog::showResponse(const QString &s)
{
setControlsEnabled(true);
trafficLabel->setText(tr("Traffic, transaction #%1:"
"\n\r-request: %2"
"\n\r-response: %3")
.arg(++transactionCount).arg(requestLineEdit->text()).arg(s));
} void Dialog::processError(const QString &s)
{
setControlsEnabled(true);
statusLabel->setText(tr("Status: Not running, %1.").arg(s));
trafficLabel->setText(tr("No traffic."));
} void Dialog::processTimeout(const QString &s)
{
setControlsEnabled(true);
statusLabel->setText(tr("Status: Running, %1.").arg(s));
trafficLabel->setText(tr("No traffic."));
} void Dialog::setControlsEnabled(bool enable)
{
runButton->setEnabled(enable);
serialPortComboBox->setEnabled(enable);
waitResponseSpinBox->setEnabled(enable);
requestLineEdit->setEnabled(enable);
}
masterthread.cpp:
#include "masterthread.h" #include <QtSerialPort/QSerialPort> #include <QTime> QT_USE_NAMESPACE MasterThread::MasterThread(QObject *parent)
: QThread(parent), waitTimeout(), quit(false)
{
} //! [0]
MasterThread::~MasterThread()
{
mutex.lock();
quit = true;
cond.wakeOne();
mutex.unlock();
wait();
}
//! [0] //! [1] //! [2]
void MasterThread::transaction(const QString &portName, int waitTimeout, const QString &request)
{
//! [1]
QMutexLocker locker(&mutex); //用QMutexLocker锁住函数内的操作
this->portName = portName;
this->waitTimeout = waitTimeout;
this->request = request;
//! [3]
if (!isRunning()) //判断线程是否启动
start();
else
cond.wakeOne(); //已经启动则唤醒线程
}
//! [2] //! [3] //! [4]
void MasterThread::run()
{
bool currentPortNameChanged = false; //临时变量 mutex.lock();
//! [4] //! [5]
QString currentPortName; //临时变量
if (currentPortName != portName) {
currentPortName = portName;
currentPortNameChanged = true;
} int currentWaitTimeout = waitTimeout;
QString currentRequest = request;
mutex.unlock(); //到这里把私有信息传递进去了
//! [5] //! [6]
QSerialPort serial; //创建了一个串口类 while (!quit) {
//![6] //! [7]
if (currentPortNameChanged) { //如果改了名字
serial.close();
serial.setPortName(currentPortName); //重新打开 if (!serial.open(QIODevice::ReadWrite)) { //判断是否打开成功
emit error(tr("Can't open %1, error code %2")
.arg(portName).arg(serial.error()));
return;
}
}
//! [7] //! [8]
// write request
QByteArray requestData = currentRequest.toLocal8Bit(); //请求的消息转成byte格式
serial.write(requestData); //发送数据
if (serial.waitForBytesWritten(waitTimeout)) { //等待waitTimeout时间发送数据
//! [8] //! [10]
// read response
if (serial.waitForReadyRead(currentWaitTimeout)) { //等待waitTimeout时间读取串口数据
QByteArray responseData = serial.readAll(); //将读取数据写到responseData中
while (serial.waitForReadyRead()) //再等10秒
responseData += serial.readAll(); //写进responseData中 QString response(responseData); //这里又转成QString类型了
//! [12]
emit this->response(response); //发送response信号
//! [10] //! [11] //! [12]
} else {
emit timeout(tr("Wait read response timeout %1")
.arg(QTime::currentTime().toString())); //发送响应延时信号
}
//! [9] //! [11]
} else {
emit timeout(tr("Wait write request timeout %1")
.arg(QTime::currentTime().toString())); //发送写延时信号
}
//! [9] //! [13]
mutex.lock();
cond.wait(&mutex); //这里又等待了?怎么唤醒?第二次按按钮时唤醒,这是一个循环。再次点击又运行一次
if (currentPortName != portName) {
currentPortName = portName;
currentPortNameChanged = true;
} else {
currentPortNameChanged = false;
}
currentWaitTimeout = waitTimeout;
currentRequest = request;
mutex.unlock();
}
//! [13]
}
最新文章
- 通过js调用android原生方法
- Redux
- 【2016-11-7】【坚持学习】【Day22】【Oracle 分页查询】
- VC++ 截屏代码,并保存为想要的格式(BMP,JPG,PNG,GIF等格式)
- 第46套题【STL】【贪心】【递推】【BFS 图】
- string tips
- 5. c++ 内存管理 C/C++ 内存机制
- Ubunu下安装mongoDB
- js的数组操作
- hdu 2769 uva 12169 Disgruntled Judge 拓展欧几里德
- Kafka 源代码分析之Message
- gitlab与jenkins的自动化部署(通过webhook与ansilble)
- 如何从零开始系统化学习视觉SLAM?
- VM安装centos7
- jQuery-jqprint.js打印插件使用高版本jQuery时问题
- JVM总结-synchronized
- 读取型CSRF-需要交互的内容劫持
- html5 &; upload files
- notepad++添加插件管理器
- Linux下 jenkins的安装
热门文章
- 威胁预警|Solr velocity模板注入远程命令执行已加入watchbog武器库,漏洞修补时间窗口越来越短
- SQL语句中,除数为0时,相应方法
- SSM - 全局跨域处理
- python 对 excel 的操作
- [CSP-S模拟测试]:联(小清新线段树)
- .net core linux的守护进程 supervisor
- python unittest 之mock
- Maven 上传文件 Error creating bean with name &#39;multipartResolver&#39;:
- Hadoop2.2.0在Ubuntu编译失败解决方法
- 这么简单的 Redis 面试题都不懂,怎么拿offer?