if(mSocket == INVALID_SOCKET){ ui->label_2->setText(QString("发送失败")); return; } QString msg = ui->lineEdit_2->text(); qDebug() << msg; //发送信息 emit isSend(msg);
时间: 2024-04-04 12:29:18 浏览: 64
这段代码是一个 Qt 应用程序中的槽函数。首先,它检查套接字(mSocket)是否有效,如果无效,则设置标签(label_2)文本为“发送失败”并返回。如果套接字有效,它将获取用户界面中的一个文本框(lineEdit_2)的文本内容(msg),并使用 qDebug() 输出到调试控制台。最后,它将使用 emit 发送一个自定义信号 isSend,将文本内容作为参数传递给信号的槽函数处理。
相关问题
mSocket = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP); if(mSocket == INVALID_SOCKET){ ui->label->setText(QString("连接失败!!!")); ui->label->setStyleSheet("color:red;"); return; } mAddrStr = ui->lineEdit->text(); char ip[1024] = {0}; int port = 0; sscanf(mAddrStr.toUtf8().data(),"%[^:]:%d",ip,&port); qDebug() << ip; qDebug() << port; SOCKADDR_IN addr; addr.sin_family = PF_INET; addr.sin_port = htons((u_short)port); addr.sin_addr.S_un.S_addr = inet_addr(ip);//点分十进制转ip地址 int val = ::connect(mSocket,(SOCKADDR*)&addr,sizeof(addr)); int error; if( val == SOCKET_ERROR){ ui->label->setText(QString("连接失败!!!")); ui->label->setStyleSheet("color:red;"); error = WSAGetLastError(); qDebug() << "connect error:" << error; return; } ui->label->setText(QString("连接成功")); ui->label->setStyleSheet("color:orange;"); //创建处理和服务端通信的线程 mMsgThread = new MsgThread(mSocket); mMsgThread->start(); //信号槽连接 connect(this,&client::isSend,mMsgThread,&MsgThread::dealSend); connect(mMsgThread,&MsgThread::isMsg,this,&client::dealMsg); connect(mMsgThread,&MsgThread::isClose,this,&client::dealClose); }
这段代码是客户端连接服务器的核心部分,具体操作如下:
1. 调用socket函数创建一个套接字对象mSocket,用于与服务器进行通信;
2. 检查mSocket是否创建成功,如果失败,则更新UI界面为连接失败,并返回;
3. 从UI界面获取服务器地址和端口号,并将其解析为IP地址和端口号;
4. 填写SOCKADDR_IN结构体,用于指定服务器的地址和端口号;
5. 调用connect函数连接到服务器,如果连接失败,则更新UI界面为连接失败,并返回;
6. 如果连接成功,则更新UI界面为连接成功;
7. 创建一个MsgThread对象mMsgThread,并启动该线程;
8. 将三个信号与槽连接起来,用于处理客户端和服务器之间的消息传递。
总体来说,这段代码的作用是初始化一个客户端并连接到服务器,使得客户端可以与服务器进行通信。
#include "mainwindow.h"#include "ui_mainwindow.h"#include <QMessageBox>#include <QTextEdit>#include <QPushButton>TemperatureThread::TemperatureThread(QObject *parent) : QThread(parent){ m_temperature = 0.0;}void TemperatureThread::run(){ while (true){ m_temperature = qrand() % 100; emit temperatureChanged(m_temperature); msleep(1000); }}MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow){ ui->setupUi(this); m_temperatureThread = new TemperatureThread(this); m_timer = new QTimer(this); m_threshold = 0.0; connect(m_temperatureThread, &TemperatureThread::temperatureChanged, this, &MainWindow::updateTemperature);}MainWindow::~MainWindow(){ delete ui;}void MainWindow::on_startButton_clicked(){ if (m_temperatureThread->isRunning()) { QMessageBox::warning(this,tr("Warning"),tr("Alarm already started")); return; } bool ok; m_threshold = ui->thresholdEdit->text().toDouble(&ok); if (!ok) { QMessageBox::warning(this,tr("warning"),tr("Invalid")); return; } m_temperatureThread->start(); m_timer->start(1000);}void MainWindow::on_stopButton_clicked(){ if (!m_timer->isActive() || !m_temperatureThread->isRunning()) { QMessageBox::warning(this,tr("Warning"),tr("Alarm not started yet")); return; } m_temperatureThread->quit(); m_temperatureThread->wait(); m_timer->stop(); ui->temperatureLabel->setText(QString::number(0.0));}void MainWindow::updateTemperature(double temperature){ ui->temperatureLabel->setText(QString::number(temperature)); if (temperature > m_threshold){ QMessageBox::critical(this,tr("Warning"),tr("Temperature too high")); }}这段代码怎么改,可以使timer的数据逐渐增大,而不是随意乱弹出数据
您可以使用一个变量来保存当前的时间,每次更新温度时增加这个变量的值,然后用变量的值作为计时器的间隔。具体来说,您需要做以下更改:
1.在MainWindow类中添加一个私有变量m_time,用于保存当前时间。
2.在MainWindow类的构造函数中将m_time初始化为0。
3.在MainWindow类的updateTemperature函数中增加m_time的值。
4.在MainWindow类的on_startButton_clicked函数中,将计时器的间隔设置为m_time的值,并在开始计时器之前将m_time的值增加。
5.在MainWindow类的on_stopButton_clicked函数中,停止计时器时将m_time重置为0。
下面是修改后的代码:
```
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>
#include <QTextEdit>
#include <QPushButton>
TemperatureThread::TemperatureThread(QObject *parent)
: QThread(parent){
m_temperature = 0.0;
}
void TemperatureThread::run(){
while (true){
m_temperature = qrand() % 100;
emit temperatureChanged(m_temperature);
msleep(1000);
}
}
MainWindow::MainWindow(QWidget *parent):
QMainWindow(parent),
ui(new Ui::MainWindow){
ui->setupUi(this);
m_temperatureThread = new TemperatureThread(this);
m_timer = new QTimer(this);
m_threshold = 0.0;
m_time = 0;
connect(m_temperatureThread, &TemperatureThread::temperatureChanged,
this, &MainWindow::updateTemperature);
}
MainWindow::~MainWindow(){
delete ui;
}
void MainWindow::on_startButton_clicked(){
if (m_temperatureThread->isRunning()) {
QMessageBox::warning(this,tr("Warning"),tr("Alarm already started"));
return;
}
bool ok;
m_threshold = ui->thresholdEdit->text().toDouble(&ok);
if (!ok) {
QMessageBox::warning(this,tr("warning"),tr("Invalid"));
return;
}
m_time = 0;
m_timer->start(m_time);
m_temperatureThread->start();
}
void MainWindow::on_stopButton_clicked(){
if (!m_timer->isActive() || !m_temperatureThread->isRunning()) {
QMessageBox::warning(this,tr("Warning"),tr("Alarm not started yet"));
return;
}
m_temperatureThread->quit();
m_temperatureThread->wait();
m_timer->stop();
ui->temperatureLabel->setText(QString::number(0.0));
m_time = 0;
}
void MainWindow::updateTemperature(double temperature){
ui->temperatureLabel->setText(QString::number(temperature));
m_time += 1000;
if (temperature > m_threshold){
QMessageBox::critical(this,tr("Warning"),tr("Temperature too high"));
}
m_timer->setInterval(m_time);
}
```
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