signals: void aSignal(); ... private: ... QPushButton *aButton; }; MyWidget::MyWidget() { aButton = new QPushButton( this ); connect( aButton, SIGNAL(clicked()), SIGNAL(aSignal()) ); } 在上面的构造函数中,MyWidget 创建了一个私有的按钮 aButton,按钮的单击事件产生的信号 clicked...
#ifndefNEWSPAPER_H#defineNEWSPAPER_H#include<QCoreApplication>#include<QObject>#include<QDebug>classNewspaper:public QObject { Q_OBJECT public: Newspaper(constQString & name) : m_name(name) { }voidsend(){ emitnewPaper(m_name); } signals:voidnewPaper(constQString &name); private: QString ...
#ifndefNEWSPAPER_H#defineNEWSPAPER_H#include<QCoreApplication>#include<QObject>#include<QDebug>classNewspaper:public QObject { Q_OBJECT public: Newspaper(constQString & name) : m_name(name) { }voidsend(){ emitnewPaper(m_name); } signals:voidnewPaper(constQString &name); private: QString ...
有可能多个Object的signal会连接到同一个signal(例如多个Button可能会connect到一个slot函数onClick()),因此这是就需要判断到底是哪个Object emit了这个signal,根据sender的不同来进行不同的处理 QObject::Sender()返回发送信号的对象的指针,返回类型为QObject * 示例代码: 1. QTimeEdit *editor = qobject_cast<Q...
signals:voidsend(constQString &content);publicslots://启动日志服务voidstart();//暂停日志服务voidstop();//保存日志voidsave(constQString &content);//设置是否重定向到网络voidsetToNet(booltoNet);//设置日志文件存放路径voidsetPath(constQString &path);//设置日志文件名称voidsetName(constQString &nam...
classSenderWidget:publicQWidget{Q_OBJECTsignals:voidsendData(constQString&data);privateslots:voidonButtonClicked();};发送界面的实现文件:voidSenderWidget::onButtonClicked(){QString data="Hello";emitsendData(data);}接收界面的头文件:classReceiverWidget:publicQWidget{Q_OBJECTprivateslots:voidonDataReceived...
如果signals/slots的函数参数是一个自己定义的类型。比如自己定义了一个Student类,信号函数为sendStudent(const Student &stu);对应的槽函数为:getStudent(const Student &stu);如果在非主线程使用emit发射信号的时候Student参数是一个临时变量的话(即可能马上被析构掉),那么主线程在执行这个槽函数的时候这个临时变量...
QTableWidgetItem* item = widget->item(row, column); QString textFromItem = item->data(Qt::UserRole); emit cellChanged(row, column, textFromItem); Of course, previously you have to declare your own signal: signals: void cellChanged(int row, int col, QString text); Your signal can ...
Q_OBJECTpublic:explicitSubWidget(QWidget *parent =0);voidsendSlot(); signals:/* 信号必须有signals关键字来声明 * 信号没有返回值,但可以有参数 * 信号就是函数的声明,只需声明,无需定义 * 使用:emit mySignal(); * 信号可以重载 */voidmySignal();voidmySignal(int,QString);publicslots:private: ...
void StatusClient::slotHeartBad() { // 断线处理 qDebug() << "心跳包断线"; _statusSocket->disconnectFromHost(); emit signalDisconnectedToServer(); } 完整实现 客户端完整实现如下: StatusClient::StatusClient(const QString host, const int port, QObject *parent) : m_host(host), m_port(po...