本文主要测试了Qt对多重继承的支持，以及QThread中多线程的问题。代码示例如下：
![]()
//main.h
![]()
![]()
#ifndef MAIN_H_INCLUDED
![]()
#define MAIN_H_INCLUDED
![]()
#include <QThread>
![]()
#include <iostream>
![]()
#include <cstdio>
![]()
#include <QApplication>
![]()
![]()
using namespace std;
![]()
![]()
class A1 {
![]()
public:
![]()
virtual void exe() = 0;
![]()
};
![]()
![]()
class A2 : public A1 {
![]()
public:
![]()
A2(int a) {a2 = a;}
![]()
virtual void exe() {
![]()
cout << "I am A2" << endl;
![]()
}
![]()
private:
![]()
int a2;
![]()
};
![]()
![]()
class A : public QObject , public A2{
![]()
Q_OBJECT
![]()
public:
![]()
A(int a, QObject *parent = 0): A2(a), QObject(parent) {
![]()
}
![]()
virtual void exe() {
![]()
cout << "I am A" << endl;
![]()
cout <<"A-Thread: " << QThread::currentThreadId() << endl;
![]()
fun();
![]()
}
![]()
void fun() {
![]()
cout <<"A-Func: " << QThread::currentThreadId() << endl;
![]()
emit IamSignal();
![]()
}
![]()
signals:
![]()
void IamSignal();
![]()
};
![]()
![]()
class MyThread : public QThread {
![]()
Q_OBJECT
![]()
public:
![]()
MyThread(QObject *parent = 0):QThread(parent){}
![]()
void run() {
![]()
myA->exe();
![]()
cout << "ThreadID: " << currentThreadId() << endl;
![]()
}
![]()
void setA(A *a) {
![]()
myA = a;
![]()
}
![]()
public slots:
![]()
void IamThreadSlots() {
![]()
cout <<"Thread-Solts: " << currentThreadId() << endl;
![]()
}
![]()
private:
![]()
A1 *myA;
![]()
};
![]()
![]()
![]()
class B : public QObject {
![]()
Q_OBJECT
![]()
public:
![]()
B(QObject *parent = 0): QObject(parent) {}
![]()
void set(MyThread *myT, A *aa) {
![]()
myThread = myT;
![]()
a = aa;
![]()
myThread->setA(aa);
![]()
connect((A*)a, SIGNAL(IamSignal()), this, SLOT(IamBSlots()));
![]()
connect((A*)a, SIGNAL(IamSignal()), myThread, SLOT(IamThreadSlots()));
![]()
}
![]()
void runB() {
![]()
myThread->start();
![]()
myThread->wait();
![]()
}
![]()
public slots:
![]()
void IamBSlots() {
![]()
cout <<"B-Solts: " << QThread::currentThreadId() << endl;
![]()
}
![]()
private:
![]()
MyThread *myThread;
![]()
A1 * a;
![]()
};
![]()
![]()
#endif // MAIN_H_INCLUDED
![]()
![]()
![]()
![]()
![]()
//main.cpp
![]()
![]()
#include "main.h"
![]()
![]()
int main(int argc, char **argv) {
![]()
QApplication app(argc, argv);
![]()
MyThread myThread;
![]()
A myA(0);
![]()
B myB;
![]()
cout << "MainThreadID: " << QThread::currentThreadId() << endl;
![]()
myB.set(&myThread, &myA);
![]()
myB.runB();
![]()
return app.exec();
![]()
}
![]()
运行结果：
MainThreadID: 0xfb8
I am A
A-Thread: 0xd44
A-Func: 0xd44
ThreadID: 0xd44
B-Solts: 0xfb8
Thread-Solts: 0xfb8
结论：
1.Qt支持多重继承。
2.线程中run()函数使用的类对象属于次线程。（如：MyThread中的myA，在run()中执行时，属于次线程）
3.线程中的槽在主线程中执行。（如：MyThread中的IamThreadSlots()）
//main.h#ifndef MAIN_H_INCLUDED#define MAIN_H_INCLUDED#include <QThread>#include <iostream>#include <cstdio>#include <QApplication>using namespace std;
class A1 {
public: virtual void exe() = 0;
};class A2 : public A1 {public:
A2(int a) {a2 = a;}
A2( virtual void exe() { cout << "I am A2" << endl;
}private: int a2;};class A : public QObject , public A2{ Q_OBJECTpublic: A(int a, QObject *parent = 0): A2(a), QObject(parent) { } virtual void exe() { cout << "I am A" << endl; cout <<"A-Thread: " << QThread::currentThreadId() << endl; fun(); } void fun() { cout <<"A-Func: " << QThread::currentThreadId() << endl; emit IamSignal(); }signals: void IamSignal();};class MyThread : public QThread { Q_OBJECTpublic: MyThread(QObject *parent = 0):QThread(parent){} void run() { myA->exe(); cout << "ThreadID: " << currentThreadId() << endl; } void setA(A *a) { myA = a; }public slots: void IamThreadSlots() { cout <<"Thread-Solts: " << currentThreadId() << endl; }private: A1 *myA;};class B : public QObject { Q_OBJECTpublic: B(QObject *parent = 0): QObject(parent) {} void set(MyThread *myT, A *aa) { myThread = myT; a = aa; myThread->setA(aa); connect((A*)a, SIGNAL(IamSignal()), this, SLOT(IamBSlots())); connect((A*)a, SIGNAL(IamSignal()), myThread, SLOT(IamThreadSlots())); } void runB() { myThread->start(); myThread->wait(); }public slots: void IamBSlots() { cout <<"B-Solts: " << QThread::currentThreadId() << endl; }private: MyThread *myThread; A1 * a;};#endif // MAIN_H_INCLUDED//main.cpp#include "main.h"int main(int argc, char **argv) { QApplication app(argc, argv); MyThread myThread; A myA(0); B myB; cout << "MainThreadID: " << QThread::currentThreadId() << endl; myB.set(&myThread, &myA); myB.runB(); return app.exec();}MainThreadID: 0xfb8
I am A
A-Thread: 0xd44
A-Func: 0xd44
ThreadID: 0xd44
B-Solts: 0xfb8
Thread-Solts: 0xfb8
结论：
1.Qt支持多重继承。
2.线程中run()函数使用的类对象属于次线程。（如：MyThread中的myA，在run()中执行时，属于次线程）
3.线程中的槽在主线程中执行。（如：MyThread中的IamThreadSlots()）