POCO c++ 使用例子

1.定时器  
  #include "Poco/Timer.h"  
    #include "Poco/Thread.h"  
    using Poco::Timer;  
    using Poco::TimerCallback;  
      
    class TimerExample  
    {  
        public:  
        void onTimer(Poco::Timer& timer)  
        {  
            std::cout << "onTimer called." << std::endl;  
        }  
    };  
      
    int main(int argc, char** argv)  
    {  
        TimerExample te;  
        Timer timer(250, 500); // fire after 250ms, repeat every 500ms  
        timer.start(TimerCallback<TimerExample>(te, &TimerExample::onTimer));  
        Thread::sleep(5000);  
        timer.stop();  
        return 0;  
    }  

2.管道
    #include "Poco/Process.h"  
    #include "Poco/PipeStream.h"  
    #include "Poco/StreamCopier.h"  
    #include <fstream>  
    using Poco::Process;  
    using Poco::ProcessHandle;  
    int main(int argc, char** argv)  
    {  
        std::string cmd("/bin/ps");  
        std::vector<std::string> args;  
        args.push_back("-ax");  
        Poco::Pipe outPipe;  
        ProcessHandle ph = Process::launch(cmd, args, 0, &outPipe, 0);  
        Poco::PipeInputStream istr(outPipe);  
        std::ofstream ostr("processes.txt");  
        Poco::StreamCopier::copyStream(istr, ostr);  
        return 0;  
    }  

3.poco 默认线程池
#include "stdafx.h"
#include "Poco/ThreadPool.h"
#include "Poco/Runnable.h"
#include <iostream>
class HelloRunnable: public Poco::Runnable
{
    virtual void run()
    {
        std::cout << "Hello, bingzhe" << std::endl;
    }
};
int main(int argc, char** argv)
{
    HelloRunnable runnable;
    Poco::ThreadPool::defaultPool().start(runnable);
    Poco::ThreadPool::defaultPool().joinAll();
    return 0;
}

4.内存池
    #include "Poco/MemoryPool.h"  
    #include <string>  
    #include <iostream>  
    using Poco::MemoryPool;  
    int main(int argc, char** argv)  
    {  
        MemoryPool pool(1024); // unlimited number of 1024 byte blocks  
        // MemoryPool pool(1024, 4, 16); // at most 16 blocks; 4 preallocated  
        char* buffer = reinterpret_cast<char*>(pool.get());  
        std::cin.read(buffer, pool.blockSize());  
        std::streamsize n = std::cin.gcount();  
        std::string s(buffer, n);  
        pool.release(buffer);  
        std::cout << s << std::endl;  
        return 0;  
    }  

5.任务  
  #include "Poco/Task.h"  
    #include "Poco/TaskManager.h"  
    #include "Poco/TaskNotification.h"  
    #include "Poco/Observer.h"  
      
    using Poco::Observer;  
    class SampleTask: public Poco::Task  
    {  
    public:  
        SampleTask(const std::string& name): Task(name)  
        {}  
      
      
        void runTask()  
        {  
            for (int i = 0; i < 100; ++i)  
            {  
                setProgress(float(i)/100); // report progress  
                if (sleep(1000))  
                    break;  
            }  
        }  
    };  
      
    class ProgressHandler  
    {  
    public:  
        void onProgress(Poco::TaskProgressNotification* pNf)  
        {  
            std::cout << pNf->task()->name()  
                << " progress: " << pNf->progress() << std::endl;  
            pNf->release();  
        }  
        void onFinished(Poco::TaskFinishedNotification* pNf)  
        {  
            std::cout << pNf->task()->name() << " finished." << std::endl;  
            pNf->release();  
        }  
    };  
      
    int main(int argc, char** argv)  
    {  
        Poco::TaskManager tm;  
        ProgressHandler pm;  
        tm.addObserver(  
            Observer<ProgressHandler, Poco::TaskProgressNotification>  
            (pm, &ProgressHandler::onProgress)  
            );  
        tm.addObserver(  
            Observer<ProgressHandler, Poco::TaskFinishedNotification>  
            (pm, &ProgressHandler::onFinished)  
            );  
        tm.start(new SampleTask("Task 1")); // tm takes ownership  
        tm.start(new SampleTask("Task 2"));  
        tm.joinAll();  
        return 0;  
    }  

6.通知
#include "stdafx.h"
    #include "Poco/NotificationCenter.h"  
    #include "Poco/Notification.h"  
    #include "Poco/Observer.h"  
    #include "Poco/NObserver.h"  
    #include "Poco/AutoPtr.h"  
    #include <iostream>  
    using Poco::NotificationCenter;  
    using Poco::Notification;  
    using Poco::Observer;  
    using Poco::NObserver;  
    using Poco::AutoPtr;  
    class BaseNotification: public Notification  
    {  
    public: void dosome(){
            printf("fuck!");
        }
    };  
    class SubNotification: public BaseNotification  
    {  
    
    };  
      
      
    class Target  
    {  
    public:  
        void handleBase(BaseNotification* pNf)  
        {  
            std::cout << "handleBase: " << pNf->name() << std::endl;  
            pNf->dosome();
            pNf->release(); // we got ownership, so we must release  
        }  
        void handleSub(const AutoPtr<SubNotification>& pNf)  
        {  
            std::cout << "handleSub: " << pNf->name() << std::endl;  
        }  
    };  
      
      
    int main(int argc, char** argv)  
    {  
        NotificationCenter nc;  
        Target target;  
        nc.addObserver(  
            Observer<Target, BaseNotification>(target, &Target::handleBase)  
            );  
        nc.addObserver(  
            NObserver<Target, SubNotification>(target, &Target::handleSub)  
            );  
        nc.postNotification(new BaseNotification);  
        nc.postNotification(new SubNotification);  
        nc.removeObserver(  
            Observer<Target, BaseNotification>(target, &Target::handleBase)  
            );  
        nc.removeObserver(  
            NObserver<Target, SubNotification>(target, &Target::handleSub)  
            );  
        return 0;  
    }  

7.线程
    #include "Poco/Thread.h"  
    #include "Poco/Runnable.h"  
    #include <iostream>  
    class HelloRunnable: public Poco::Runnable  
    {  
           virtual void run()  
           {  
                std::cout << "Hello, bingzhe!" << std::endl;  
           }  
    };  
    int main(int argc, char** argv)  
    {  
           HelloRunnable runnable;  
           Poco::Thread thread;  
           thread.start(runnable);  
           thread.join();  
           return 0;  
    }  

8.线程对象
    #include "Poco/Activity.h"  
    #include "Poco/Thread.h"  
    #include <iostream>  
    using Poco::Thread;  
    class ActivityExample  
    {  
    public:  
          ActivityExample(): _activity(this,   
             &ActivityExample::runActivity)  
          {}  
          void start()  
          {  
               _activity.start();  
          }  
          void stop()  
          {  
               _activity.stop(); // request stop  
               _activity.wait(); // wait until activity actually stops  
          }  
    protected:  
          void runActivity()  
         {  
              while (!_activity.isStopped())  
             {  
                  std::cout << "bingzhe running." << std::endl;  
                  Thread::sleep(200);  
             }  
          }  
    private:  
          Poco::Activity<ActivityExample> _activity;  
    };  
      
    int main(int argc, char** argv)  
    {  
          ActivityExample example;  
          example.start();  
          Thread::sleep(2000);  
          example.stop();  
          return 0;  
    }  

9.异步通知


#include "stdafx.h"
      #include "Poco/Notification.h"  
    #include "Poco/NotificationQueue.h"  
    #include "Poco/ThreadPool.h"  
    #include "Poco/Runnable.h"  
    #include "Poco/AutoPtr.h"  
    using Poco::Notification;  
    using Poco::NotificationQueue;  
    using Poco::ThreadPool;  
    using Poco::Runnable;  
    using Poco::AutoPtr;  
    class WorkNotification: public Notification  
    {  
    public:  
        WorkNotification(int data): _data(data) {}  
        int data() const  
        {  
            return _data;  
        }  
    private:  
        int _data;  
    };  
      
      
    class Worker: public Runnable  
    {  
    public:  
        Worker(NotificationQueue& queue): _queue(queue) {}  
        void run()  
        {  
            AutoPtr<Notification> pNf(_queue.waitDequeueNotification());  
            while (pNf)  
            {  
                WorkNotification* pWorkNf =  
                    dynamic_cast<WorkNotification*>(pNf.get());  
                if (pWorkNf)  
                {  
                    printf("hi!bingzhe");
                //    Sleep(100);
                }  
                pNf = _queue.waitDequeueNotification();  
            }  
        }  
    private:  
        NotificationQueue& _queue;  
    };  
      
      
    int main(int argc, char** argv)  
    {  
        NotificationQueue queue;  
        Worker worker1(queue); // create worker threads  
        Worker worker2(queue);  
        ThreadPool::defaultPool().start(worker1); // start workers  
        ThreadPool::defaultPool().start(worker2);  
        // create some work  
        for (int i = 0; i < 100; ++i)  
        {  
            queue.enqueueNotification(new WorkNotification(i));  
        }  
        while (!queue.empty()) // wait until all work is done  
            Poco::Thread::sleep(100);  
        queue.wakeUpAll(); // tell workers they're done  
        ThreadPool::defaultPool().joinAll();  
        return 0;  
    }