我的应用程序包括2个不同的对象(qobject和qmainwindow),我想知道如何与插槽/信号之间进行通信。此外,现有的方法是否更好?
有人可以做一个简单的例子吗?谢谢:)
样本
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "ui_mainwindow.h"
#include "object.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
private slots:
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "object.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->chkState, SIGNAL(clicked()), this, SLOT(object->chkState();));
}
MainWindow::~MainWindow()
{
delete ui;
}
object.h
#ifndef OBJET_H
#define OBJET_H
#include "mainwindow.h"
#include <QMainWindow>
#include <QObject>
class Object : public QObject
{
Q_OBJECT
public:
explicit Object(QObject *parent = 0);
bool state;
signals:
private slots:
void chkState(Ui::MainWindow *ui);
};
#endif // OBJET_H
objet.cpp
#include "object.h"
#include "mainwindow.h"
Object::Object(QObject *parent) : QObject(parent)
{
}
void Object::chkState(Ui::MainWindow *ui)
{
if (ui->chkState->isChecked())
{
ui->state->setText("true");
state = true;
}
else
{
ui->state->setText("false");
state = false;
}
}
这是一个简单的示例,说明了如何发出信号和插槽。
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "object.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
signals:
void transmit_to_object(bool value);
private slots:
void receive_from_object(bool value);
void on_checkBox_clicked();
private:
Ui::MainWindow *ui;
object m_object;
};
#endif // MAINWINDOW_H
#ifndef OBJECT_H
#define OBJECT_H
#include <QObject>
class object : public QObject
{
Q_OBJECT
public:
explicit object(QObject * parent = 0);
signals:
void transmit_to_gui(bool value);
private slots:
void receive_from_gui(bool value);
private:
bool state;
};
#endif // OBJECT_H
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(&m_object,SIGNAL(transmit_to_gui(bool)),this,SLOT(receive_from_object(bool)));
connect(this,SIGNAL(transmit_to_object(bool)),&m_object,SLOT(receive_from_gui(bool)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::receive_from_object(bool value)
{
if(value)
{
ui->lineEdit->setText("true");
}
else
{
ui->lineEdit->setText("false");
}
}
void MainWindow::on_checkBox_clicked()
{
if(ui->checkBox->isChecked())
{
emit transmit_to_object(true);
}
else
{
emit transmit_to_object(false);
}
}
#include "object.h"
#include "mainwindow.h"
object::object(QObject *parent)
{
}
void object::receive_from_gui(bool value)
{
state = value;
emit transmit_to_gui(state);
}
您的代码中有几个错误。第一:
connect(ui->chkState, SIGNAL(clicked()), this, SLOT(object->chkState();));
在这里您说:"当我们单击ui-> chkstate时,我希望您在此中调用一个函数,即对object-> chkstate插槽"。这绝对不是您想要的。什么是对象?此对象尚未创建。您想要的是:
connect(ui->chkState, SIGNAL(clicked()), myobject, SLOT(chkState()));
使用MyObject类型Object
的对象,因此您需要在MainWindow.h a
Object *myobject;
在连接之前在您的mainwindow.cpp中:
myobject = new Object(this);
此外,您的功能void chkState(Ui::MainWindow *ui);
无法正常工作,因为您无法在类似的参数中获得MainWindow UI。我建议您要做的事情,如果仅用于测试,所以您知道父母是MainWindow
的类型,您可以做:
void Object::chkState()
{
MainWindow* parent = static_cast<MainWindow*>(parent());
if (parent->ui->chkState->isChecked())
{
parent->ui->state->setText("true");
state = true;
}
else
{
parent->ui->state->setText("false");
state = false;
}
}
因此,删除了插槽中的参数。