QT学习之旅 - 关于StatusBar底边的限制，窗口限制，多线程的使用

StatusBar大小限制(注意这是StatusBar大小不是窗口的)

/*
statusBar()->setMinimumSize(600,400);
statusBar()->setMinimumWidth(600);
statusBar()->setMinimumHeight(400);
*/
//ui-statusbar设置
ui->statusbar->setMinimumSize(600,400);
ui->statusbar->setMinimumWidth(600);
ui->statusbar->setMinimumHeight(400);

设置窗口大小限制

setMinimumSize(600,400);
//setMinimumWidth(600);
//setMinimumHeight(400);

时间设置+statusbar中显示

statusbar中输入文字

status->setText(time + QString(" ") + message);
ui->statusbar->addWidget(status);

时间设置

QString time = QDateTime::currentDateTime().toString("hh:mm:ss.zzz");

获取本机地址

ConfigDialog::ConfigDialog(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ConfigDialog)
{
    ui->setupUi(this);
    QStringList list1 = QStringList(getLocalHostIpAddress());
    ui->combLocalIP ->addItems(QStringList(list1));
}

QString ConfigDialog::getLocalHostIpAddress(){
    QString strIpAddress;
    QList<QHostAddress> ipAddressList = QNetworkInterface::allAddresses();
    //获取第一个本主机的IPv4地址
    int nListSize = ipAddressList.size();
    for(int i = 0;i < nListSize; i++){
        if(ipAddressList.at(i) != QHostAddress::LocalHost &&
           ipAddressList.at(i).toIPv4Address()){
           strIpAddress = ipAddressList.at(i).toString();
           break;
        }
    }
    //如果没找到，则以本地IP地址位IP
    if(strIpAddress.isEmpty()){
        strIpAddress = QHostAddress(QHostAddress::LocalHost).toString();
    }
    return strIpAddress;
}

comboBox控件写入数据

QStringList list1 = QStringList(getLocalHostIpAddress());
ui->combLocalIP ->addItems(QStringList(list1));

获取LineEdit控件内容

QString str = ui->textEdit->text();

获取ComboBox控件内容

QString my_local_ip = ui->combLocalIP->currentText();

引入QtCharts

#pro中
QT += charts

//HexDataProess.cpp
#include "iostream"
#include "QString"
#include 
#include 
#include 
#include 
#include 
#include 
#include "HexDataProcess.h"

QList<double> REM(QString data)
{
    QList<double> Orignal;
    QList<QString> Changing;    //储存6字节分割的数据
    QList<double> result;

    int countflag = 0;

    while(countflag < data.size())  //将数据导入链表
    {
        QString rem;
        rem = data.mid(countflag,6);
        //qDebug()<<"数据组包"<
        Changing.append(rem);
        countflag+=6;
    }

    QString rem;   //将链表内的数据依次转换
    for(int i = 0 ; i < Changing.size(); i++)
    {
        //qDebug("%d",i);
        rem=Changing[i];
        int count;
        qint8 array[6];
        qint64 num[24]={0};
        int h=23;

        for(int b = 0 ; b < 6 ; b++ )
        {
            array[b]=rem.at(b).unicode();   //返回指定位置字符的ascii值
        }

        for(int l=5;l>=0;l--)           //获取补码转入整形数组中
        {
            if(array[l]>57)             //属于abcde
            {
                if( array[l] > 64 && array[l] < 71 )    //大写
                count = array[l] - 55;
                else
                count = array[l] - 87;                  //小写

                for(int j = 0 ; j < 4 ; j++)            //将数据转换为二进制
                {
                    num[h--] = count % 2;
                    count /= 2;
                }
            }
            else                    //属于0-9
            {
                count = array[l] - 48;
                for(int j = 0 ; j < 4 ; j++)
                {
                    num[h--] = count % 2;
                    count/=2;
                }
            }
        }


        if(num[0]==1)       //如果是负数，需将补码转为原码
        {
            for(int i=23;i>0;i--)       //减一
               {
                    if(num[i] == 1)
                    {
                        num[i] = 0;
                        break;
                    }
                    else
                    {
                        num[i]=1;
                    }
               }

            for(int i=23;i>0;i--)   //取反
            {
                if(num[i]==1)
                    num[i]=0;
                else
                    num[i]=1;
            }
        }

        double sum=0;          //得到采样值

        for(int i=23;i>0;i--)
        {
            for(int l = 0 ; l< 23 - i ; l++)
            {
                num[i] *= 2;
            }
            sum += num[i];
        }

        if(num[0] == 1)       //判断数据的正负
            sum *= (-1);

        //qDebug()<<"原始数据大小"<
        result.append( sum / ADC_24_MAX * voltage);
        Orignal.append(sum);
    }

    return result;

}

//HexDataProess.h
#ifndef HEXDATAPROCESS_H
#define HEXDATAPROCESS_H

#include "QString"
#include 

#define  ADC_24_MAX  8388607
#define  voltage     (2.5)
QList<double> REM(QString date);

#endif // HEXDATAPROCESS_H

QT Thread(多线程)

QT的线程是为了，防止一直在一个线程中而不执行其他应用

#include 
class 类名 : public QThread{};

c++多线程在Qt中使用

#include "testthread.h"
#include "ui_testthread.h"
#include "unistd.h"
#include 

TestThread::TestThread(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::TestThread)
{
    ui->setupUi(this);
    connect(ui->pushButton,&QPushButton::clicked,this,&TestThread::on_pushButton_click);
}

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

void TestThread::showInfo(){
    int i=0;
    for(;;){
        qDebug() << i;
        ui->lineEdit->setText(QString::number(i++));
        sleep(1);
    }
}

void TestThread::on_pushButton_click(){
    std::thread my_thread(&TestThread::showInfo,this);
    my_thread.detach();
}

QThread

开启线程的方法void start(QThread::Priority priority = InheritPriority)

退出线程void quit()或void exit(int returnCode = 0)这个exit要退出时在时间片上的线程退出不了，要跟bool wait(unsigned long time = ULONG_MAX)进行配合

终止线程的方式(不推荐)void terminate()不安全的函数,一般要和wait函数配合

使用一个自定义类继承QThread来重写run方法

//my_thread.cpp
#include 
#include 

void My_Thread::run(){
    int i = 0;
    for(;;){
        emit threadSignal(i++);
        qDebug() << i;
        this->sleep(1);
        if(i > 10){ //大于10退出循环
            break;
        }
    }
}

My_Thread::My_Thread(QObject *parent):QThread(parent){

}

My_Thread::~My_Thread(){
	//解构函数
}

//自定义ui界面(这里是继上个页面的ui)
#include "testthread.h"
#include "ui_testthread.h"
#include "unistd.h"
#include 

void TestThread::on_pushButton_click(){
    my_thread->start();
}

TestThread::TestThread(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::TestThread)
{
    ui->setupUi(this);
    my_thread = new My_Thread(this);//my_thread 在.h中申明
    connect(ui->pushButton,&QPushButton::clicked,this,&TestThread::on_pushButton_click);
    connect(my_thread,&UdpThread::threadSignal,[=](int val){
        ui->lineEdit->setText(QString::number(val));
    });
}



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

线程的退出

TestThread::~TestThread()
{  //显示使用的ui  cpp文件的解构函数
    delete ui;
    my_thread->exit(); //线程退出
    my_thread->wait(); //线程等待
}