Poco库网络模块例子解析1-------字典查询

#include "Poco/Net/StreamSocket.h"   //流式套接字
#include "Poco/Net/SocketStream.h"   //套接字流
#include "Poco/Net/SocketAddress.h"   //套接字地址
#include "Poco/StreamCopier.h"  //流复制器
#include "Poco/Path.h"   //路径解析器
#include "Poco/Exception.h"  //异常
#include <iostream>


using Poco::Net::StreamSocket;
using Poco::Net::SocketStream;
using Poco::Net::SocketAddress;
using Poco::StreamCopier;
using Poco::Path;
using Poco::Exception;

//从dict.org查找词语
int main(int argc, char** argv)
{
    const std::string HOST("dict.org");    //字典查询服务器
    const unsigned short PORT = 2628; //端口
    
    if (argc != 2)
    {
        Path p(argv[0]); //解析路径
        std::cout << "usage: " << p.getBaseName() << " <term>" << std::endl;  //获取BaseUrl
        std::cout << "       looks up <term> in dict.org and prints the results" << std::endl;
        return 1;
    }
    std::string term(argv[1]); //要查询的单词 作为 运行参数1
    
    try
    {
        SocketAddress sa(HOST, PORT); //定义一个套接字 地址对象  类似winsock的 sockaddr_in
        StreamSocket sock(sa);  //创建 流式套接字
        SocketStream str(sock); //创建套接字流用于进行 输入输出 类似于winsock recv send
        
        str << "DEFINE ! " << term << "\r\n" << std::flush;  //发送查询命令
        str << "QUIT\r\n" << std::flush;  //查询命令结束

        sock.shutdownSend(); //关闭发送方的链接
        /// Writes all bytes readable from istr to ostr, using an internal buffer.
        /// Returns the number of bytes copied.
        StreamCopier::copyStream(str, std::cout); //拷贝所有输入流到 输出流上  也就是说把 查询返回的结果 输出到std::cout
    }
    catch (Exception& exc)  
    {
        std::cerr << exc.displayText() << std::endl;  //异常处理
        return 1;
    }
    
    return 0;
}