我写了两个类，一个是mdspi，一个是mduser。mdspi类有个函数A，emit一个信号并调用mduser类的函数B，函数B被调用后，也会emit一个信号。现在运行结果是，不管是A调用B还是B调用A，都是第一个函数的槽函数被调用，而第二个函数也被执行了但是槽函数就没有被调用到。请问大神是什么原因呢？
#ifndef MDUSER
#define MDUSER
#include<QObject>
class Mduser : public QObject
{
Q_OBJECT
public:
Mduser(QObject *parent = 0);
public slots:
void B();
signals:
void send(QString message);
};
#endif // MDUSER
#include"mduser.h"
#include<QDebug>
#include"mdspi.h"
Mduser::Mduser(QObject *parent) :
QObject(parent)
{
}
void Mduser::B()
{
emit send("B");
qDebug() << "This is function B! " << endl;
}
#ifndef MDSPI
#define MDSPI
#include <QObject>
#include "mduser.h"
class mdspi: public QObject
{
Q_OBJECT
public:
mdspi(QObject *parent = 0);
public slots:
A();
signals:
send(QString message);
private:
Mduser md;
};
#endif // MDSPI
#include "mdspi.h"
#include <qDebug>
mdspi::mdspi(QObject *parent) :
QObject(parent)
{
}
mdspi::A()
{
qDebug() << "This is function A!" << endl;
emit send("A");
md.B();
}
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "mdspi.h"
#include "mduser.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void receive(QString message);
void receive2(QString message);
void on_pushButton_clicked();
void on_pushButton_2_clicked();
private:
Ui::MainWindow *ui;
mdspi spi;
Mduser md;
};
#endif // MAINWINDOW_H
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <qDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(&spi,SIGNAL(send(QString)),this,SLOT(receive(QString)));
connect(&md,SIGNAL(send(QString)),this,SLOT(receive2(QString)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
spi.A();
}
void MainWindow::receive(QString message)
{
qDebug() << "receive A" << endl;
ui->lineEdit->setText(message);
}
void MainWindow::receive2(QString message)
{
qDebug() << "receive B" << endl;
ui->lineEdit_2->setText(message);
}
void MainWindow::on_pushButton_2_clicked()
{
md.B();
}
