qt实现智能购票系统信号槽机制
时间: 2023-06-10 15:07:17 浏览: 60
智能购票系统的信号槽机制可以使用Qt的信号槽机制来实现。下面是一个简单的示例:
首先,在头文件中声明需要的信号和槽:
```c++
class TicketSystem : public QObject
{
Q_OBJECT
public:
explicit TicketSystem(QObject *parent = nullptr);
signals:
void requestTickets(QString startStation, QString endStation, QDateTime dateTime);
void ticketsAvailable(QList<Ticket> tickets);
void noTicketsAvailable();
public slots:
void searchTickets(QString startStation, QString endStation, QDateTime dateTime);
private:
QList<Ticket> m_ticketList;
}
```
在构造函数中,将信号与槽相连:
```c++
TicketSystem::TicketSystem(QObject *parent) : QObject(parent)
{
connect(this, &TicketSystem::requestTickets, this, &TicketSystem::searchTickets);
}
```
当外部调用 `requestTickets` 信号时,将会触发 `searchTickets` 槽函数的执行。
在 `searchTickets` 槽函数中,根据条件查询票务信息,并通过 `ticketsAvailable` 信号或 `noTicketsAvailable` 信号将结果返回给调用方:
```c++
void TicketSystem::searchTickets(QString startStation, QString endStation, QDateTime dateTime)
{
QList<Ticket> availableTickets;
// 根据条件查询票务信息
if (availableTickets.isEmpty()) {
emit noTicketsAvailable();
} else {
emit ticketsAvailable(availableTickets);
}
}
```
外部调用者可以连接 `ticketsAvailable` 和 `noTicketsAvailable` 信号,以接收查询结果:
```c++
TicketSystem *ticketSystem = new TicketSystem();
connect(ticketSystem, &TicketSystem::ticketsAvailable, this, &MyClass::onTicketsAvailable);
connect(ticketSystem, &TicketSystem::noTicketsAvailable, this, &MyClass::onNoTicketsAvailable);
void MyClass::onTicketsAvailable(QList<Ticket> tickets)
{
// 处理查询结果
}
void MyClass::onNoTicketsAvailable()
{
// 处理查询结果
}
```