制作图片海报的软件,做神马网站优化快速排,个人域名用来做淘宝客网站,如何给自家网站做关键词优化点击 C 语言编程核心突破 快速C语言入门 Qt学习总结 前言二十 QTcpSocket QTcpServer网络库服务端代码:客户端代码 二十一 QProcess进程类二十二 QThread线程总结 前言
要解决问题: 学习qt最核心知识, 多一个都不学. 二十 QTcpSocket QTcpServer网络库
QTcpSocket和… 点击 C 语言编程核心突破 快速C语言入门 Qt学习总结 前言二十 QTcpSocket QTcpServer网络库服务端代码:客户端代码 二十一 QProcess进程类二十二 QThread线程总结 前言
要解决问题: 学习qt最核心知识, 多一个都不学. 二十 QTcpSocket QTcpServer网络库
QTcpSocket和QTcpServer网络库是QT框架提供的网络编程库之一用于实现TCP协议的网络通信。
下面是QTcpSocket和QTcpServer网络库中常用的C函数
QTcpSocket常用函数
QTcpSocket(QObject *parent nullptr)构造函数。void connectToHost(const QString hostName, quint16 port)连接到指定的主机名和端口。void disconnectFromHost()断开与主机的连接。qint64 write(const char *data, qint64 maxSize)将数据写入套接字。QByteArray read(qint64 maxSize)从套接字中读取数据。bool waitForReadyRead(int msecs)等待套接字有可读数据的信号。bool waitForConnected(int msecs)等待套接字成功连接到主机的信号。void flush()将写入缓冲区的数据刷新到套接字。
QTcpServer常用函数
QTcpServer(QObject *parent nullptr)构造函数。bool listen(const QHostAddress address QHostAddress::Any, quint16 port 0)开始监听指定的地址和端口。void close()关闭套接字停止监听。bool isListening() const判断是否正在监听。QTcpSocket *nextPendingConnection()获取下一个挂起的连接。qintptr socketDescriptor() const获取套接字的描述符。
以上是常用的QTcpSocket和QTcpServer网络库C函数其他函数可参考QT官方文档。
示例: 关闭客户端, 再开启客户端连接, 发送信息 服务端代码:
Widget.h
#ifndef WIDGET_H
#define WIDGET_H#include QTcpServer
#include QTcpSocket
#include QWidgetQT_BEGIN_NAMESPACE
namespace Ui
{
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent nullptr);~Widget();private slots:void on_cancelButton_clicked();void on_sendButton_clicked();public slots:void connectHandler();void reciveText();private:Ui::Widget *ui;QTcpServer *qtServer;QTcpSocket *qtSocket;
};
#endif // WIDGET_H
main.cpp
#include Widget.h#include QApplication
#include QLocale
#include QTranslatorint main(int argc, char *argv[])
{QApplication a(argc, argv);QTranslator translator;const QStringList uiLanguages QLocale::system().uiLanguages();for (const QString locale : uiLanguages) {const QString baseName Learn_18_ QLocale(locale).name();if (translator.load(:/i18n/ baseName)) {a.installTranslator(translator);break;}}Widget w;w.show();return a.exec();
}
Widget.cpp
#include Widget.h
#include ./ui_Widget.hWidget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget), qtServer(new QTcpServer), qtSocket(nullptr)
{ui-setupUi(this);qtServer-listen(QHostAddress::AnyIPv4, 8000);connect(qtServer, SIGNAL(newConnection()), this, SLOT(connectHandler()));
}Widget::~Widget()
{delete ui;qtServer-close();if (qtSocket ! nullptr){qtSocket-close();}
}void Widget::on_cancelButton_clicked()
{this-close();
}void Widget::connectHandler()
{if (qtSocket ! nullptr){qtSocket-disconnect();qtSocket-disconnectFromHost();qtSocket-close();}qtSocket qtServer-nextPendingConnection();ui-ipLineEdit-setText(qtSocket-peerAddress().toString());ui-portLineEdit-setText(QString::number(qtSocket-peerPort()));connect(qtSocket, SIGNAL(readyRead()), this, SLOT(reciveText()));connect(qtSocket, QTcpSocket::disconnected,[this]() { qDebug() Disconnected; });
}void Widget::reciveText()
{ui-reciveLineEdit-setText(QString(qtSocket-readAll()));
}void Widget::on_sendButton_clicked()
{if (qtSocket-isValid()){qtSocket-write(ui-sendLineEdit-text().toUtf8());}else{qDebug() unconnect;}
}
ui_Widget.h
/********************************************************************************
** Form generated from reading UI file Widget.ui
**
** Created by: Qt User Interface Compiler version 6.5.2
**
** WARNING! All changes made in this file will be lost when recompiling UI file!
********************************************************************************/#ifndef UI_WIDGET_H
#define UI_WIDGET_H#include QtCore/QVariant
#include QtWidgets/QApplication
#include QtWidgets/QFormLayout
#include QtWidgets/QHBoxLayout
#include QtWidgets/QLabel
#include QtWidgets/QLineEdit
#include QtWidgets/QPushButton
#include QtWidgets/QWidgetQT_BEGIN_NAMESPACEclass Ui_Widget
{
public:QLabel *label_5;QWidget *widget;QFormLayout *formLayout;QLabel *label;QLineEdit *ipLineEdit;QLabel *label_2;QLineEdit *portLineEdit;QLabel *label_3;QLineEdit *reciveLineEdit;QLabel *label_4;QLineEdit *sendLineEdit;QWidget *widget1;QHBoxLayout *horizontalLayout;QPushButton *sendButton;QPushButton *cancelButton;void setupUi(QWidget *Widget){if (Widget-objectName().isEmpty())Widget-setObjectName(Widget);Widget-resize(482, 419);label_5 new QLabel(Widget);label_5-setObjectName(label_5);label_5-setGeometry(QRect(190, 20, 92, 50));label_5-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));widget new QWidget(Widget);widget-setObjectName(widget);widget-setGeometry(QRect(10, 90, 461, 220));formLayout new QFormLayout(widget);formLayout-setObjectName(formLayout);formLayout-setContentsMargins(0, 0, 0, 0);label new QLabel(widget);label-setObjectName(label);label-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(0, QFormLayout::LabelRole, label);ipLineEdit new QLineEdit(widget);ipLineEdit-setObjectName(ipLineEdit);ipLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(0, QFormLayout::FieldRole, ipLineEdit);label_2 new QLabel(widget);label_2-setObjectName(label_2);label_2-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(1, QFormLayout::LabelRole, label_2);portLineEdit new QLineEdit(widget);portLineEdit-setObjectName(portLineEdit);portLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(1, QFormLayout::FieldRole, portLineEdit);label_3 new QLabel(widget);label_3-setObjectName(label_3);label_3-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(2, QFormLayout::LabelRole, label_3);reciveLineEdit new QLineEdit(widget);reciveLineEdit-setObjectName(reciveLineEdit);reciveLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(2, QFormLayout::FieldRole, reciveLineEdit);label_4 new QLabel(widget);label_4-setObjectName(label_4);label_4-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(3, QFormLayout::LabelRole, label_4);sendLineEdit new QLineEdit(widget);sendLineEdit-setObjectName(sendLineEdit);sendLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(3, QFormLayout::FieldRole, sendLineEdit);widget1 new QWidget(Widget);widget1-setObjectName(widget1);widget1-setGeometry(QRect(10, 330, 461, 54));horizontalLayout new QHBoxLayout(widget1);horizontalLayout-setObjectName(horizontalLayout);horizontalLayout-setContentsMargins(0, 0, 0, 0);sendButton new QPushButton(widget1);sendButton-setObjectName(sendButton);sendButton-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));horizontalLayout-addWidget(sendButton);cancelButton new QPushButton(widget1);cancelButton-setObjectName(cancelButton);cancelButton-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));horizontalLayout-addWidget(cancelButton);retranslateUi(Widget);QMetaObject::connectSlotsByName(Widget);} // setupUivoid retranslateUi(QWidget *Widget){Widget-setWindowTitle(QCoreApplication::translate(Widget, Widget, nullptr));label_5-setText(QCoreApplication::translate(Widget, \346\234\215\345\212\241\347\253\257, nullptr));label-setText(QCoreApplication::translate(Widget, IP\345\234\260\345\235\200, nullptr));label_2-setText(QCoreApplication::translate(Widget, \347\253\257\345\217\243\345\217\267, nullptr));label_3-setText(QCoreApplication::translate(Widget, \346\224\266 \346\226\207, nullptr));label_4-setText(QCoreApplication::translate(Widget, \345\217\221 \346\226\207, nullptr));sendButton-setText(QCoreApplication::translate(Widget, \345\217\221\351\200\201, nullptr));cancelButton-setText(QCoreApplication::translate(Widget, \345\217\226\346\266\210, nullptr));} // retranslateUi};namespace Ui {class Widget: public Ui_Widget {};
} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H
客户端代码
Widget.h
#ifndef WIDGET_H
#define WIDGET_H#include QTcpSocket
#include QWidgetQT_BEGIN_NAMESPACE
namespace Ui
{
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent nullptr);~Widget();private slots:void on_linkButton_clicked();void on_sendButton_clicked();void on_cancelButton_clicked();public slots:void recieveText();private:Ui::Widget *ui;QTcpSocket *socket;
};
#endif // WIDGET_H
main.cpp
#include Widget.h#include QApplication
#include QLocale
#include QTranslatorint main(int argc, char *argv[])
{QApplication a(argc, argv);QTranslator translator;const QStringList uiLanguages QLocale::system().uiLanguages();for (const QString locale : uiLanguages) {const QString baseName Learn_19_ QLocale(locale).name();if (translator.load(:/i18n/ baseName)) {a.installTranslator(translator);break;}}Widget w;w.show();return a.exec();
}
Widget.cpp
#include Widget.h
#include ./ui_Widget.hWidget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget), socket(new QTcpSocket)
{ui-setupUi(this);connect(socket, QTcpSocket::connected, [this]() { qDebug() OK; });connect(socket, SIGNAL(readyRead()), this, SLOT(recieveText()));connect(socket, QTcpSocket::disconnected,[this]() { qDebug() Disconnected; });
}Widget::~Widget()
{delete ui;
}void Widget::on_linkButton_clicked()
{// socket-disconnect();QString ipAdd(ui-ipLineEdit-text());socket-connectToHost(QHostAddress(ipAdd),ui-portLineEdit-text().toUShort());
}void Widget::on_sendButton_clicked()
{if (socket-isValid()){socket-write(ui-sendLineEdit-text().toUtf8());}
}void Widget::on_cancelButton_clicked()
{this-close();
}void Widget::recieveText()
{QString res QString::fromUtf8(socket-readAll());ui-recieveLineEdit-setText(res);qDebug() res;
}
ui_Widget.h
/********************************************************************************
** Form generated from reading UI file Widget.ui
**
** Created by: Qt User Interface Compiler version 6.5.2
**
** WARNING! All changes made in this file will be lost when recompiling UI file!
********************************************************************************/#ifndef UI_WIDGET_H
#define UI_WIDGET_H#include QtCore/QVariant
#include QtWidgets/QApplication
#include QtWidgets/QFormLayout
#include QtWidgets/QHBoxLayout
#include QtWidgets/QLabel
#include QtWidgets/QLineEdit
#include QtWidgets/QPushButton
#include QtWidgets/QWidgetQT_BEGIN_NAMESPACEclass Ui_Widget
{
public:QLabel *label_5;QWidget *layoutWidget;QFormLayout *formLayout;QLabel *label;QLineEdit *ipLineEdit;QLabel *label_2;QLineEdit *portLineEdit;QLabel *label_3;QLineEdit *sendLineEdit;QLabel *label_4;QLineEdit *recieveLineEdit;QWidget *layoutWidget1;QHBoxLayout *horizontalLayout;QPushButton *linkButton;QPushButton *sendButton;QPushButton *cancelButton;void setupUi(QWidget *Widget){if (Widget-objectName().isEmpty())Widget-setObjectName(Widget);Widget-resize(555, 400);label_5 new QLabel(Widget);label_5-setObjectName(label_5);label_5-setGeometry(QRect(220, 10, 101, 50));label_5-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));layoutWidget new QWidget(Widget);layoutWidget-setObjectName(layoutWidget);layoutWidget-setGeometry(QRect(10, 80, 541, 220));formLayout new QFormLayout(layoutWidget);formLayout-setObjectName(formLayout);formLayout-setContentsMargins(0, 0, 0, 0);label new QLabel(layoutWidget);label-setObjectName(label);label-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(0, QFormLayout::LabelRole, label);ipLineEdit new QLineEdit(layoutWidget);ipLineEdit-setObjectName(ipLineEdit);ipLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(0, QFormLayout::FieldRole, ipLineEdit);label_2 new QLabel(layoutWidget);label_2-setObjectName(label_2);label_2-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(1, QFormLayout::LabelRole, label_2);portLineEdit new QLineEdit(layoutWidget);portLineEdit-setObjectName(portLineEdit);portLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(1, QFormLayout::FieldRole, portLineEdit);label_3 new QLabel(layoutWidget);label_3-setObjectName(label_3);label_3-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(2, QFormLayout::LabelRole, label_3);sendLineEdit new QLineEdit(layoutWidget);sendLineEdit-setObjectName(sendLineEdit);sendLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(2, QFormLayout::FieldRole, sendLineEdit);label_4 new QLabel(layoutWidget);label_4-setObjectName(label_4);label_4-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(3, QFormLayout::LabelRole, label_4);recieveLineEdit new QLineEdit(layoutWidget);recieveLineEdit-setObjectName(recieveLineEdit);recieveLineEdit-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(3, QFormLayout::FieldRole, recieveLineEdit);layoutWidget1 new QWidget(Widget);layoutWidget1-setObjectName(layoutWidget1);layoutWidget1-setGeometry(QRect(10, 330, 531, 54));horizontalLayout new QHBoxLayout(layoutWidget1);horizontalLayout-setObjectName(horizontalLayout);horizontalLayout-setContentsMargins(0, 0, 0, 0);linkButton new QPushButton(layoutWidget1);linkButton-setObjectName(linkButton);linkButton-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));horizontalLayout-addWidget(linkButton);sendButton new QPushButton(layoutWidget1);sendButton-setObjectName(sendButton);sendButton-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));horizontalLayout-addWidget(sendButton);cancelButton new QPushButton(layoutWidget1);cancelButton-setObjectName(cancelButton);cancelButton-setStyleSheet(QString::fromUtf8(font: 700 24pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));horizontalLayout-addWidget(cancelButton);retranslateUi(Widget);QMetaObject::connectSlotsByName(Widget);} // setupUivoid retranslateUi(QWidget *Widget){Widget-setWindowTitle(QCoreApplication::translate(Widget, Widget, nullptr));label_5-setText(QCoreApplication::translate(Widget, \345\256\242\346\210\267\347\253\257, nullptr));label-setText(QCoreApplication::translate(Widget, IP, nullptr));ipLineEdit-setText(QCoreApplication::translate(Widget, 127.0.0.1, nullptr));label_2-setText(QCoreApplication::translate(Widget, \347\253\257\345\217\243, nullptr));portLineEdit-setText(QCoreApplication::translate(Widget, 8000, nullptr));label_3-setText(QCoreApplication::translate(Widget, \345\217\221\351\200\201, nullptr));label_4-setText(QCoreApplication::translate(Widget, \346\216\245\346\224\266, nullptr));linkButton-setText(QCoreApplication::translate(Widget, \350\277\236\346\216\245, nullptr));sendButton-setText(QCoreApplication::translate(Widget, \345\217\221\351\200\201, nullptr));cancelButton-setText(QCoreApplication::translate(Widget, \345\217\226\346\266\210, nullptr));} // retranslateUi};namespace Ui {class Widget: public Ui_Widget {};
} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H
通常在建立qt项目时, 不会自动链接Network头文件及库文件, 需要在cmake文件中加入:
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Network)
target_link_libraries(Learn_18 PRIVATE Qt${QT_VERSION_MAJOR}::Network)其中Learn_18是项目名, 根据你的项目更改.
二十一 QProcess进程类
QProcess是一个进程管理类它允许您启动外部程序和与它们通信。
QProcess支持同步和异步启动也可以使用管道和I / O重定向向子进程发送和接收数据。
下面是常用函数列表 QProcess(const QStringList arguments QStringList(), QObject *parent nullptr) 该函数可以创建一个用于启动外部程序的QProcess对象可以设置启动参数。 setProgram(QString program) 设置要启动的程序或可执行文件的路径。 setArguments(const QStringList arguments) 设置启动参数列表。 setWorkingDirectory(QString dir) 设置运行外部程序的工作目录。 start(const QString program, const QStringList arguments {}, OpenMode mode ReadWrite); 启动外部程序。 waitForStarted(int msecs 30000) 等待外部程序启动返回true表示启动成功false表示启动失败。 waitForFinished(int msecs 30000) 等待外部程序执行完成返回true表示执行完成false表示超时或执行失败。 readAllStandardOutput() 读取外部程序的标准输出返回一个QByteArray。 readAllStandardError() 读取外部程序的标准错误输出返回一个QByteArray。 void write(const QByteArray byteArray) 向外部程序的标准输入写入数据。
您还可以使用QIODevice API通过管道与子进程通信。
常见的用法是通过标准输入输出管道或错误输出管道发送和接收数据。
您还可以使用readAllStandardOutput()和readAllStandardError()函数来获取进程的输出和错误输出。
在非Windows平台上QProcess使用QAbstractEventDispatcher来监视子进程。
使用QProcess的事件循环时如果有进程事件到达将调用QProcess的虚拟函数来处理该事件。
如果使用waitForStarted或waitForFinished之类的功能等待进程则QProcess将在事件循环内等待进程事件的到来。
在Windows上QProcess使用WaitHandle实现进程监视并且可以兼容在Windows上使用其他Qt的进程相关类。
示例: 用进程类实现一个应用, 当点击run, 从命令和参数文本框获取命令文本, 并启动进程, 将结果返回到结果文本框中. Widget.h
#ifndef WIDGET_H
#define WIDGET_H#include QProcess
#include QWidgetQT_BEGIN_NAMESPACE
namespace Ui
{
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent nullptr);~Widget();private slots:void on_runButton_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H
main.cpp
#include Widget.h#include QApplication
#include QLocale
#include QTranslatorint main(int argc, char *argv[])
{QApplication a(argc, argv);QTranslator translator;const QStringList uiLanguages QLocale::system().uiLanguages();for (const QString locale : uiLanguages) {const QString baseName Learn_20_ QLocale(locale).name();if (translator.load(:/i18n/ baseName)) {a.installTranslator(translator);break;}}Widget w;w.show();return a.exec();
}
Widget.cpp
#include Widget.h
#include ./ui_Widget.hWidget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui-setupUi(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_runButton_clicked()
{QProcess process(this);QStringList qsl;qsl ui-optionLineEdit-text();process.start(ui-commendLineEdit-text(), qsl);if (process.waitForStarted() process.waitForFinished()){qDebug() OK;}QByteArray output process.readAllStandardOutput();ui-resultTextEdit-setText(QString::fromLocal8Bit(output));qDebug() QString::fromLocal8Bit(output);
}
ui_Widget.h
/********************************************************************************
** Form generated from reading UI file Widget.ui
**
** Created by: Qt User Interface Compiler version 6.5.2
**
** WARNING! All changes made in this file will be lost when recompiling UI file!
********************************************************************************/#ifndef UI_WIDGET_H
#define UI_WIDGET_H#include QtCore/QVariant
#include QtWidgets/QApplication
#include QtWidgets/QFormLayout
#include QtWidgets/QLabel
#include QtWidgets/QLineEdit
#include QtWidgets/QPushButton
#include QtWidgets/QTextEdit
#include QtWidgets/QWidgetQT_BEGIN_NAMESPACEclass Ui_Widget
{
public:QPushButton *runButton;QTextEdit *resultTextEdit;QWidget *layoutWidget;QFormLayout *formLayout;QLabel *label;QLabel *label_2;QLineEdit *commendLineEdit;QLineEdit *optionLineEdit;void setupUi(QWidget *Widget){if (Widget-objectName().isEmpty())Widget-setObjectName(Widget);Widget-resize(508, 577);runButton new QPushButton(Widget);runButton-setObjectName(runButton);runButton-setGeometry(QRect(10, 530, 81, 31));runButton-setStyleSheet(QString::fromUtf8(font: 700 16pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));resultTextEdit new QTextEdit(Widget);resultTextEdit-setObjectName(resultTextEdit);resultTextEdit-setGeometry(QRect(10, 90, 491, 421));layoutWidget new QWidget(Widget);layoutWidget-setObjectName(layoutWidget);layoutWidget-setGeometry(QRect(10, 10, 491, 72));formLayout new QFormLayout(layoutWidget);formLayout-setObjectName(formLayout);formLayout-setContentsMargins(0, 0, 0, 0);label new QLabel(layoutWidget);label-setObjectName(label);label-setStyleSheet(QString::fromUtf8(font: 700 16pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(0, QFormLayout::LabelRole, label);label_2 new QLabel(layoutWidget);label_2-setObjectName(label_2);label_2-setStyleSheet(QString::fromUtf8(font: 700 16pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(0, QFormLayout::FieldRole, label_2);commendLineEdit new QLineEdit(layoutWidget);commendLineEdit-setObjectName(commendLineEdit);commendLineEdit-setStyleSheet(QString::fromUtf8(font: 700 16pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(1, QFormLayout::LabelRole, commendLineEdit);optionLineEdit new QLineEdit(layoutWidget);optionLineEdit-setObjectName(optionLineEdit);optionLineEdit-setStyleSheet(QString::fromUtf8(font: 700 16pt \\351\230\277\351\207\214\345\267\264\345\267\264\346\231\256\346\203\240\344\275\223 B\;));formLayout-setWidget(1, QFormLayout::FieldRole, optionLineEdit);retranslateUi(Widget);QMetaObject::connectSlotsByName(Widget);} // setupUivoid retranslateUi(QWidget *Widget){Widget-setWindowTitle(QCoreApplication::translate(Widget, Widget, nullptr));runButton-setText(QCoreApplication::translate(Widget, run, nullptr));label-setText(QCoreApplication::translate(Widget, \345\221\275\344\273\244, nullptr));label_2-setText(QCoreApplication::translate(Widget, \345\217\202\346\225\260, nullptr));} // retranslateUi};namespace Ui {class Widget: public Ui_Widget {};
} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H二十二 QThread线程
QThread是Qt框架中的线程类它提供了一个跨平台的线程类库可以在Qt应用程序中实现多线程编程实现并发执行任务的能力。
QThread类通过继承QThread并重载run()函数来实现自己的线程。
run()函数中包含了线程的逻辑代码线程启动时会自动调用run()函数。
QThread还提供了一些常用的函数如start()函数开始线程quit()函数结束线程wait()函数等待线程结束等。
常用函数
start()启动线程该函数将会调用run()函数
sleep()暂停当前线程单位毫秒
quit()结束线程类似于Thread类的Stop方法
wait()等待当前线程执行完毕阻塞当前线程
finished()当线程执行结束时会发出该信号
terminate()强制关闭线程类似于Thread类的Abort方法。
C示例用线程返回相加结果, 并在主线程输出 我们实现一个myThread线程类, 继承自QThread, 当触发计算时, 调用槽函数, 生成线程, 线程运算相加结果, 并通过信号槽机制返回给主线程, 进行显示.
myThread.h
#ifndef MYTHREAD_H
#define MYTHREAD_H#include QThreadclass myThread : public QThread
{Q_OBJECTpublic:explicit myThread(QObject *parent nullptr, int numA_ 0, int numB_ 0);void run() override;signals:void result(int);private:int numA;int numB;
};#endif // MYTHREAD_H
myThread.cpp
#include myThread.hmyThread::myThread(QObject *parent, int numA_, int numB_): QThread{parent}, numA(numA_), numB(numB_)
{}void myThread::run()
{emit result(numA numB);
}
通过简单的封装, 可以很容易的将数据传给线程, 通过信号槽机制, 又很容易的可以将结果返回, 相比C或C原生thread, 已经人性化的一塌糊度了.
当然, 效率问题不在本文探讨之列.
Widget.h
#ifndef WIDGET_H
#define WIDGET_H#include QWidgetQT_BEGIN_NAMESPACE
namespace Ui
{
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent nullptr);~Widget();public slots:void getResult(int res);private slots:void on_pushButton_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H
Widget.cpp
#include Widget.h
#include ./ui_Widget.h
#include myThread.hWidget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui-setupUi(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_clicked()
{int numA ui-lineEditA-text().toInt();int numB ui-lineEditB-text().toInt();myThread *qthrd new myThread(this, numA, numB);qthrd-start();connect(qthrd, SIGNAL(result(int)), this, SLOT(getResult(int)));qthrd-wait();qthrd-deleteLater();
}void Widget::getResult(int res)
{ui-lineEditSum-setText(QString::number(res));
} 总结
二十 QTcpSocket QTcpServer网络库 服务端代码: 客户端代码 二十一 QProcess进程类 二十二 QThread线程 点击 C 语言编程核心突破 快速C语言入门
