如何使用Qtimer添加1秒延迟 [英] how to add a 1 second delay using Qtimer

问题描述

我目前有一个方法如下

void SomeMethod(int a)
{

     //Delay for one sec.
     timer->start(1000);

     //After one sec
     SomeOtherFunction(a);
}

此方法实际上是附加到信号的插槽。我想添加一个延迟1秒使用Qtimer.However我不知道如何完成这个。由于定时器在其完成时触发信号，并且信号将需要附接到不接受任何参数的另一方法。任何建议，如何我可以完成这项任务。

This method is actually a slot that is attached to a signal. I would like to add a delay of one sec using Qtimer.However I am not sure on how to accomplish this. Since the timer triggers a signal when its finished and the signal would need to be attached to another method that does not take in any parameters. Any suggestion on how I could accomplish this task.?

更新：
信号将在一秒钟内多次调用，延迟时间为1秒。我的问题是传递参数到附加到定时器的timeout（）信号的插槽。
我的最后一种方法是将值存储在一个类的memeber变量，然后使用互斥体保护它在使用变量时不被更改.how我在这里寻找更简单的方法。

Update : The signal will be called multiple times in a second and the delay will be for a second. My issue here is passing a parameter to the slot attached to timeout() signal of a timer. My last approach would be to store the value in a memeber variable of a class and then use a mutex to protect it from being changed while the variable is being used .however I am looking for simpler methods here.

推荐答案

我有点困惑的方式你的问题，但如果你问如何获取定时器的超时信号调用带有参数的函数，然后可以创建一个单独的插槽来接收超时，然后调用所需的函数。类似这样： -

I'm a bit confused by the way you phrase your question, but if you're asking how to get the timer's timeout() signal to call a function with a parameter, then you can create a separate slot to receive the timeout and then call the function you want. Something like this: -

class MyClass : public QObject
{
    Q_OBJECT

public:
    MyClass(QObject* parent);

public slots:

    void TimerHandlerFunction();
    void SomeMethod(int a);

private:
    int m_a;
    QTimer m_timer;

};

实施： -

MyClass::MyClass(QObject* parent)
    :QObject(parent)
{
    // connect the timer's timeout to our TimerHandlerFunction
    connect(&m_timer, SIGNAL(timout()), this, SLOT(TimerHandlerFunction()));
}

void MyClass::SomeMethod(int a)
{
    m_a = a; // store the value to pass later

    m_timer.setSingleShot(true); // if you only want it to fire once
    m_timer.start(1000);
}

void MyClass::TimerHandlerFunction()
{
     SomeOtherFunction(m_a);
}

注意QObject类实际上有一个定时器，你可以通过调用startTimer （），所以你实际上不需要在这里使用一个单独的QTimer对象。它包含在这里尝试保持示例代码接近的问题。

Note that the QObject class actually has a timer that you can use by calling startTimer(), so you don't actually need to use a separate QTimer object here. It is included here to try to keep the example code close to the question.

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