Dlib库【4】——定时器Timer，线程对象

配置Dlib环境：  链接

1.定时器Timer

Timer可以规律地循环调用特定的功能函数

//可以定时地开启线程（例如过30ms打开第二个线程而不把主线程阻塞住？）

// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt/*This is an example illustrating the use of the timer object from the dlib C++ Library.The timer is an object that calls some user specified member function at regularintervals from another thread.*/#include <dlib/timer.h>#include <dlib/misc_api.h> // for dlib::sleep#include <iostream>using namespace dlib;using namespace std;// ----------------------------------------------------------------------------------------class timer_example{public:void action_function(){// print out a message so we can see that this function is being triggeredcout << "action_function() called" << endl;}};// ----------------------------------------------------------------------------------------int main(){//直观上timer的主要作用是可以精确的过一段时间再开第二个线程timer_example e;// Here we construct our timer object.  It needs two things.  The second argument is// the member function it is going to call at regular intervals and the first argument// is the object instance it will call that member function on.timer<timer_example> t(e, &timer_example::action_function);// Set the timer object to trigger every secondt.set_delay_time(1000);// Start the timer.  It will start calling the action function 1 second from this call// to start.t.start();// Sleep for 10 seconds before letting the program end.  dlib::sleep(10000);//dlib::sleep(10000);// The timer will destruct itself properly and stop calling the action_function.}// ----------------------------------------------------------------------------------------

2.线程对象

pause可以暂停，直观上没有看出特别重要的作用…………之后如果用到了再来丰润吧

// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
/*

This is an example illustrating the use of the threaded_object
from the dlib C++ Library.


This is a very simple example. It creates a single thread that
just prints messages to the screen.
*/

#include <iostream>#include <dlib/threads.h>#include <dlib/misc_api.h>  // for dlib::sleepusing namespace std;using namespace dlib;class my_object : public threaded_object{public:my_object(){// Start our thread going in the thread() functionstart();}~my_object(){// Tell the thread() function to stop.  This will cause should_stop() to // return true so the thread knows what to do.stop();// Wait for the thread to stop before letting this object destruct itself.// Also note, you are *required* to wait for the thread to end before // letting this object destruct itself.wait();}private:void thread(){// This is our thread.  It will loop until it is told that it should terminate.while (should_stop() == false){cout << "hurray threads!" << endl;dlib::sleep(500);}}};int main(){// Create an instance of our threaded object.   my_object t;dlib::sleep(4000);// Tell the threaded object to pause its thread.  This causes the// thread to block on its next call to should_stop().t.pause();dlib::sleep(3000);cout << "starting thread back up from paused state" << endl;// Tell the thread to unpause itself.  This causes should_stop() to unblock // and to let the thread continue.t.start();dlib::sleep(4000);// Let the program end.  When t is destructed it will gracefully terminate your// thread because we have set the destructor up to do so.}