Qt系列文章目录
文章目录
前言
最近遇到这种情况：假设有3个类：A，B，C
A类和B类之间相互传递数据，而C类负责控制A类和B类，换句话说，C类管理着A类和B类。
Qt不同类之间建立信号槽，并传递参数
一.A类：TestA
1.头文件和实现文件
#ifndef TESTA_H
#define TESTA_H
#include <QObject>
class TestA : public QObject
{
Q_OBJECT
public:
explicit TestA(QObject *parent = nullptr);
void emitDataFromTestA();
signals:
void sendDataFromTestA(const char* data);
public slots:
void recvDataAtTestA(const char* data);
};
#endif // TESTA_H
```cpp
#include "TestA.h"
#include <QDebug>
TestA::TestA(QObject *parent) : QObject(parent)
{
}
void TestA::emitDataFromTestA()
{
const char* name = "Data from testA";
emit sendDataFromTestA(name);
}
void TestA::recvDataAtTestA(const char *data)
{
// QString print = data;
// qDebug() << print.toLatin1();
qDebug() << "TestA class recive data:" << data;
}
# 二、B类：TestB
```cpp
#ifndef TESTB_H
#define TESTB_H
#include <QObject>
class TestB : public QObject
{
Q_OBJECT
public:
explicit TestB(QObject *parent = nullptr);
void emitDataFromTestB();
signals:
void sendDataFromTestB(const char* data);
public slots:
void recvDataAtTestB(const char* data);
};
#endif // TESTB_H
#include "TestB.h"
#include <QDebug>
TestB::TestB(QObject *parent) : QObject(parent)
{
}
void TestB::emitDataFromTestB()
{
const char* name = "Data from testB";
emit sendDataFromTestB(name);
}
void TestB::recvDataAtTestB(const char *data)
{
qDebug() << "TestB class recive data:" << data;
}
三 C类：
#ifndef CONTROL_H
#define CONTROL_H
#include <QObject>
#include "TestA.h"
#include "TestB.h"
class Control : public QObject
{
Q_OBJECT
public:
explicit Control(QObject *parent = nullptr);
~Control();
public:
TestA* m_pTestA;
TestB* m_pTestB;
void controlSendData();
signals:
};
#endif // CONTROL_H
#include "Control.h"
Control::Control(QObject *parent) : QObject(parent)
{
m_pTestA = new TestA;
m_pTestB = new TestB;
QObject::connect(m_pTestA, &TestA::sendDataFromTestA, m_pTestB, &TestB::recvDataAtTestB);
QObject::connect(m_pTestB, &TestB::sendDataFromTestB, m_pTestA, &TestA::recvDataAtTestA);
}
Control::~Control()
{
if(m_pTestA)
{
delete m_pTestA;
m_pTestA = nullptr;
}
if(m_pTestB)
{
delete m_pTestB;
m_pTestB = nullptr;
}
}
void Control::controlSendData()
{
m_pTestA->emitDataFromTestA();
m_pTestB->emitDataFromTestB();
}
四 调用类
#include "MainWindow.h"
#include "TestA.h"
#include "TestB.h"
#include "Control.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// TestA testA;
// TestB testB;
// a.connect(&testA, &TestA::sendDataFromTestA, &testB, &TestB::recvDataAtTestB);
// testA.emitDataFromTestA();
// a.connect(&testB, &TestB::sendDataFromTestB, &testA, &TestA::recvDataAtTestA);
// testB.emitDataFromTestB();
Control control;
control.controlSendData();
MainWindow w;
w.show();
return a.exec();
}
运行
