{"id":15574,"date":"2025-04-18T22:07:40","date_gmt":"2025-04-18T14:07:40","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/15574.html"},"modified":"2025-04-18T22:07:40","modified_gmt":"2025-04-18T14:07:40","slug":"%e7%ae%80%e6%98%93%e7%89%88%e5%bc%82%e6%ad%a5%e5%a4%9a%e7%ba%bf%e7%a8%8b%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/15574.html","title":{"rendered":"\u7b80\u6613\u7248\u201c\u5f02\u6b65\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u201d"},"content":{"rendered":"<hr \/>\n<p>1.\u5f15\u7528 \u548c\u590d\u5236(\u4e0d\u7528&amp;\u505a\u53c2\u6570) \u7684\u533a\u522b (1)\u7b2c\u4e00\u4e2a:\u80af\u5b9a\u662f\u4e00\u4e2a\u539f\u53c2\u6570\u64cd\u4f5c,\u53e6\u5916\u4e00\u4e2a\u662f\u5bf9\u539f\u53c2\u6570 \u590d\u5236\u4e00\u4e2a\u526f\u672c \u53bb\u64cd\u4f5c&#xff08;\u5f00\u9500\u95ee\u9898&#xff09; (2)\u7b2c\u4e8c\u4e2a:\u5982\u679c\u662f\u516c\u5171\u53c2\u6570,\u6bd4\u5982io_context,\u4ed6\u59cb\u7ec8\u53ea\u6709\u4e00\u4e2a(\u4e0e\u5185\u6838\u76f8\u5173),\u53ea\u80fd\u7531&amp;<\/p>\n<hr \/>\n<h3>\u7b80\u4ecb<\/h3>\n<p>\u672c\u6587\u57fa\u4e8ec&#043;&#043;,\u91cd\u70b9\u662f\u6765\u638c\u63e1c&#043;&#043;\u7684\u5f02\u6b65\u6982\u5ff5.\u4e5f\u662f\u57fa\u4e8eboost\u7684asio\u5e93<\/p>\n<h3>\u670d\u52a1\u7aef<\/h3>\n<h4>\u5bf9\u8bdd\u8bbe\u8ba1<\/h4>\n<p>\u56e0\u4e3a\u662fio\u590d\u7528\u7684\u670d\u52a1\u5668\u8bbe\u8ba1,\u6211\u4eec\u7684\u670d\u52a1\u5668\u53ea\u6709\u4e00\u4e2a\u7aef\u53e3\u548cip\u5730\u5740,\u53ea\u5c31\u8981\u4ea7\u751f\u591a\u4e2a \u591a\u4e2a\u4f1a\u8bdd\u533a \u5373\u662f \u5ba2\u6237\u7aef<\/p>\n<p>\u4ee5\u9632\u5185\u5b58\u6cc4\u6f0f,\u672c\u8bbe\u8ba1\u91c7\u7528\u667a\u80fd\u6307\u9488\u6765\u63a7\u5236\u5bf9\u8c61\u7684\u91ca\u653e.<\/p>\n<p>\u53c2\u8003\u8d44\u6599<\/p>\n<p><span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>ip<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">session<\/span><span class=\"token operator\">:<\/span><span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> std<span class=\"token operator\">::<\/span><span class=\"token class-name\">enable_shared_from_this<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token class-name\">session<\/span><span class=\"token operator\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token function\">session<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context <span class=\"token operator\">&amp;<\/span>io_context<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span><span class=\"token function\">socket_<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> <span class=\"token function\">self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">shared_from_this<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">async_read_until<\/span><span class=\"token punctuation\">(<\/span>socket_<span class=\"token punctuation\">,<\/span>buffer<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span>self<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span>std<span class=\"token operator\">::<\/span>size_t len<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>istream <span class=\"token function\">is<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>self<span class=\"token operator\">-&gt;<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>string line<span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token operator\">::<\/span><span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>is<span class=\"token punctuation\">,<\/span>line<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Received: &#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>line<span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token operator\">-&gt;<\/span>socket_<span class=\"token punctuation\">,<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Receive is finished&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span>self<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    self<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><br \/>\n            std<span class=\"token operator\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span>ec<span class=\"token punctuation\">.<\/span><span class=\"token function\">failed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    tcp<span class=\"token operator\">::<\/span>socket socket_<span class=\"token punctuation\">;<\/span><br \/>\n    boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>streambuf buffer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a\u91c7\u7528\u9012\u5f52\u4e00\u76f4\u8bfb\u5199<\/p>\n<ul>\n<li>boost::asio::async_read_until(socket, buffer, delimiter, read_handler);<\/li>\n<\/ul>\n<ul>\n<li>socket&#xff1a; \u7c7b\u578b&#xff1a;boost::asio::basic_stream_socket \u6216\u5176\u4ed6\u652f\u6301\u5f02\u6b65\u8bfb\u53d6\u7684\u5957\u63a5\u5b57\u7c7b\u578b\u3002 \u4f5c\u7528&#xff1a;\u6307\u5b9a\u4ece\u54ea\u4e2a\u5957\u63a5\u5b57\u8bfb\u53d6\u6570\u636e\u3002<\/li>\n<li>buffer&#xff1a; \u7c7b\u578b&#xff1a;boost::asio::streambuf \u6216\u5176\u4ed6\u52a8\u6001\u7f13\u51b2\u533a\u7c7b\u578b\u3002 \u4f5c\u7528&#xff1a;\u5b58\u50a8\u8bfb\u53d6\u5230\u7684\u6570\u636e\u3002async_read_until \u4f1a\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5b58\u50a8\u5230\u8fd9\u4e2a\u7f13\u51b2\u533a\u4e2d\u3002<\/li>\n<li>delimiter&#xff1a; \u7c7b\u578b&#xff1a;char \u6216 std::string\u3002 \u4f5c\u7528&#xff1a;\u6307\u5b9a\u8bfb\u53d6\u64cd\u4f5c\u7684\u7ed3\u675f\u6761\u4ef6\u3002\u5f53\u8bfb\u53d6\u5230\u7684\u6570\u636e\u4e2d\u5305\u542b\u8fd9\u4e2a\u5206\u9694\u7b26\u65f6&#xff0c;\u8bfb\u53d6\u64cd\u4f5c\u5c06\u505c\u6b62\u3002\u4f8b\u5982&#xff0c;\u5982\u679c\u4f60\u6307\u5b9a\u5206\u9694\u7b26\u4e3a \\\\n&#xff0c;\u5219\u8bfb\u53d6\u64cd\u4f5c\u4f1a\u5728\u9047\u5230\u6362\u884c\u7b26\u65f6\u505c\u6b62\u3002<\/li>\n<li>read_handler&#xff1a; \u7c7b\u578b&#xff1a;\u56de\u8c03\u51fd\u6570\u6216 lambda \u8868\u8fbe\u5f0f\u3002 \u4f5c\u7528&#xff1a;\u5728\u8bfb\u53d6\u64cd\u4f5c\u5b8c\u6210\u65f6\u88ab\u8c03\u7528\u3002\u56de\u8c03\u51fd\u6570\u7684\u7b7e\u540d\u901a\u5e38\u4e3a&#xff1a;void read_handler(const boost::system::error_code&amp; ec, std::size_t bytes_transferred);<\/li>\n<\/ul>\n<ul>\n<li>boost::asio::async_write(socket, buffers, write_handler);<\/li>\n<\/ul>\n<ul>\n<li>socket&#xff1a; \u7c7b\u578b&#xff1a;boost::asio::basic_stream_socket \u6216\u5176\u4ed6\u652f\u6301\u5f02\u6b65\u5199\u5165\u7684\u6d41\u7c7b\u578b\u3002 \u4f5c\u7528&#xff1a;\u6307\u5b9a\u5c06\u6570\u636e\u5199\u5165\u5230\u54ea\u4e2a\u5957\u63a5\u5b57\u6216\u6d41\u4e2d\u3002<\/li>\n<li>buffers&#xff1a; \u7c7b\u578b&#xff1a;boost::asio::const_buffer \u6216 std::vectorboost::asio::const_buffer\u3002 \u4f5c\u7528&#xff1a;\u6307\u5b9a\u8981\u5199\u5165\u7684\u6570\u636e\u3002const_buffer \u662f\u4e00\u4e2a\u8868\u793a\u5e38\u91cf\u7f13\u51b2\u533a\u7684\u7c7b&#xff0c;\u53ef\u4ee5\u5305\u542b\u6307\u5411\u6570\u636e\u7684\u6307\u9488\u548c\u6570\u636e\u7684\u5927\u5c0f\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 &#8211; &#8211; &#8211; \u2014boost::asio::buffer \u51fd\u6570\u6765\u521b\u5efa const_buffer \u5bf9\u8c61\u3002<\/li>\n<li>write_handler&#xff1a; \u7c7b\u578b&#xff1a;\u56de\u8c03\u51fd\u6570\u6216 lambda \u8868\u8fbe\u5f0f\u3002 \u4f5c\u7528&#xff1a;\u5728\u5199\u5165\u64cd\u4f5c\u5b8c\u6210\u65f6\u88ab\u8c03\u7528\u3002\u56de\u8c03\u51fd\u6570\u7684\u7b7e\u540d\u901a\u5e38\u4e3a&#xff1a;<\/li>\n<\/ul>\n<h4>\u670d\u52a1\u7aef<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">server<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">server<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context <span class=\"token operator\">&amp;<\/span>io_context<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">short<\/span> port<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span><span class=\"token function\">acceptor_<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">,<\/span>tcp<span class=\"token operator\">::<\/span><span class=\"token function\">endpoint<\/span><span class=\"token punctuation\">(<\/span>tcp<span class=\"token operator\">::<\/span><span class=\"token function\">v4<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">io_context_<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Server is running on port: &#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>port<span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">start_accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">start_accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> new_session<span class=\"token operator\">&#061;<\/span>std<span class=\"token operator\">::<\/span>make_shared<span class=\"token operator\">&lt;<\/span>session<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>io_context_<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        acceptor_<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_accept<\/span><span class=\"token punctuation\">(<\/span>new_session<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span>new_session<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                new_session<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">start_accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u91c7\u7528\u9012\u5f52\u6765\u4e0d\u65ad\u8fde\u63a5<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context <span class=\"token operator\">&amp;<\/span>io_context_<span class=\"token punctuation\">;<\/span><br \/>\n    tcp<span class=\"token operator\">::<\/span>acceptor acceptor_<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>acceptor_.async_accept<\/p>\n<p>\u53c2\u6570\u4e3a socket&#xff1a; \u7c7b\u578b&#xff1a;boost::asio::basic_stream_socket \u6216\u5176\u4ed6\u652f\u6301\u5f02\u6b65\u5199\u5165\u7684\u6d41\u7c7b\u578b\u3002&#xff08;\u5176\u5b9e\u662f\u5ba2\u6237\u7aef\u7684socekt&#xff09; \u56de\u8c03\u51fd\u6570<\/p>\n<p>io_context\u4e3a\u670d\u52a1\u5668\u7684socket<\/p>\n<h4>\u8fd0\u884c<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context io_context<span class=\"token punctuation\">;<\/span><br \/>\n        server <span class=\"token function\">s<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">,<\/span><span class=\"token number\">8080<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>vector<span class=\"token operator\">&lt;<\/span>std<span class=\"token operator\">::<\/span>thread<span class=\"token operator\">&gt;<\/span><span class=\"token function\">threads<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;<\/span>threads<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            threads<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>std<span class=\"token operator\">::<\/span><span class=\"token function\">thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&amp;<\/span>io_context<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                io_context<span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> <span class=\"token operator\">&amp;<\/span>thread<span class=\"token operator\">:<\/span> threads<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">join<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>std<span class=\"token operator\">::<\/span>exception ec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span>ec<span class=\"token punctuation\">.<\/span><span class=\"token function\">what<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&lt;&lt;<\/span>std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f7f\u7528\u4e86\u591a\u4e2a\u8fdb\u7a0b\u6765\u8fd0\u884cio_context.run();<\/p>\n<h3>\u5ba2\u6237\u7aef<\/h3>\n<h3>tcp::resolver<\/h3>\n<p>\u5728 Boost.Asio \u4e2d&#xff0c;boost::asio::ip::tcp::resolver \u662f\u4e00\u4e2a\u7528\u4e8e\u89e3\u6790\u4e3b\u673a\u540d\u548c\u7aef\u53e3\u540d\u79f0\u7684\u7c7b\u3002\u5b83\u5c06\u4e3b\u673a\u540d\u548c\u7aef\u53e3\u540d\u79f0\u8f6c\u6362\u4e3a\u4e00\u4e2a\u6216\u591a\u4e2a tcp::endpoint \u5bf9\u8c61&#xff0c;\u8fd9\u4e9b\u5bf9\u8c61\u8868\u793a\u53ef\u4ee5\u8fde\u63a5\u5230\u7684\u7f51\u7edc\u5730\u5740\u548c\u7aef\u53e3\u3002<\/p>\n<h5>tcp::resolver \u7684\u4f5c\u7528<\/h5>\n<p>tcp::resolver \u7684\u4e3b\u8981\u4f5c\u7528\u662f\u5c06\u4e3b\u673a\u540d\u548c\u7aef\u53e3\u540d\u79f0\u89e3\u6790\u4e3a\u4e00\u4e2a\u6216\u591a\u4e2a tcp::endpoint \u5bf9\u8c61\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u6b65\u9aa4&#xff1a;<\/p>\n<ul>\n<li>DNS \u67e5\u8be2&#xff1a;\u5c06\u4e3b\u673a\u540d\u89e3\u6790\u4e3a\u4e00\u4e2a\u6216\u591a\u4e2a IP \u5730\u5740\u3002<\/li>\n<li>\u7aef\u53e3\u89e3\u6790&#xff1a;\u5c06\u7aef\u53e3\u540d\u79f0\u89e3\u6790\u4e3a\u4e00\u4e2a\u7aef\u53e3\u53f7\u3002<\/li>\n<li>\u751f\u6210 tcp::endpoint&#xff1a;\u5c06\u89e3\u6790\u5f97\u5230\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u7ec4\u5408\u6210\u4e00\u4e2a\u6216\u591a\u4e2a tcp::endpoint \u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<h4>\u65b9\u6cd5<\/h4>\n<ul>\n<li>tcp::resolver::query()<\/li>\n<\/ul>\n<p>query(const std::string&amp; host, const std::string&amp; service);<\/p>\n<ul>\n<li>void async_resolve(const query&amp; q,ResolveHandler handler);<\/li>\n<\/ul>\n<p>q&#xff1a;\u4e00\u4e2a tcp::resolver::query \u5bf9\u8c61&#xff0c;\u5305\u542b\u4e3b\u673a\u540d\u548c\u7aef\u53e3\u540d\u79f0\u3002 handler&#xff1a;\u89e3\u6790\u5b8c\u6210\u540e\u7684\u56de\u8c03\u51fd\u6570\u3002\u56de\u8c03\u51fd\u6570\u7684\u7b7e\u540d\u901a\u5e38\u4e3a&#xff1a;void handler(const boost::system::error_code&amp; ec, tcp::resolver::results_type endpoints); \u8fd4\u56de\u4e00\u4e2a\u6216\u591a\u4e2aendpoint\u5bf9\u8c61<\/p>\n<ul>\n<li>boost::asio::async_connect(socket_, endpoints, [this, self](boost::system::error_code ec, tcp::endpoint)<\/li>\n<li>\u4f7f\u7528 async_connect \u5f02\u6b65\u8fde\u63a5\u5230\u89e3\u6790\u5f97\u5230\u7684 tcp::endpoint\u3002<\/li>\n<\/ul>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/enable_shared_from_this.hpp&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">using<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>ip<span class=\"token operator\">::<\/span>tcp<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">client<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> std<span class=\"token operator\">::<\/span><span class=\"token class-name\">enable_shared_from_this<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token class-name\">client<\/span><span class=\"token operator\">&gt;<\/span><\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">client<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context<span class=\"token operator\">&amp;<\/span> io_context<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">socket_<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">resolver_<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token operator\">::<\/span>string<span class=\"token operator\">&amp;<\/span> server<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token operator\">::<\/span>string<span class=\"token operator\">&amp;<\/span> port<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> <span class=\"token function\">self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">shared_from_this<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        tcp<span class=\"token operator\">::<\/span>resolver<span class=\"token operator\">::<\/span>query <span class=\"token function\">query<\/span><span class=\"token punctuation\">(<\/span>server<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        resolver_<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_resolve<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> self<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span> tcp<span class=\"token operator\">::<\/span>resolver<span class=\"token operator\">::<\/span>results_type endpoints<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">async_connect<\/span><span class=\"token punctuation\">(<\/span>socket_<span class=\"token punctuation\">,<\/span> endpoints<span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> self<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span> tcp<span class=\"token operator\">::<\/span>endpoint<span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">{<\/span><br \/>\n                            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n                            <span class=\"token punctuation\">{<\/span><br \/>\n                                <span class=\"token function\">do_write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                            <span class=\"token punctuation\">}<\/span><br \/>\n                            <span class=\"token keyword\">else<\/span><br \/>\n                            <span class=\"token punctuation\">{<\/span><br \/>\n                                std<span class=\"token operator\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Connection failed: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ec<span class=\"token punctuation\">.<\/span><span class=\"token function\">message<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token punctuation\">}<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">else<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Resolve failed: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ec<span class=\"token punctuation\">.<\/span><span class=\"token function\">message<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">do_write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> <span class=\"token function\">self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">shared_from_this<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>string message <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello, server!\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span>socket_<span class=\"token punctuation\">,<\/span> boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> self<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span> std<span class=\"token operator\">::<\/span>size_t <span class=\"token comment\">\/*length*\/<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8bfb\u53d6\u6570\u636e<\/span><br \/>\n                    <span class=\"token function\">do_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">else<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Write failed: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ec<span class=\"token punctuation\">.<\/span><span class=\"token function\">message<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">do_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> <span class=\"token function\">self<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">shared_from_this<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span><span class=\"token function\">async_read_until<\/span><span class=\"token punctuation\">(<\/span>socket_<span class=\"token punctuation\">,<\/span> buffer_<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> self<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>boost<span class=\"token operator\">::<\/span>system<span class=\"token operator\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span> std<span class=\"token operator\">::<\/span>size_t length<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span>istream <span class=\"token function\">is<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>buffer_<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span>string line<span class=\"token punctuation\">;<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span><span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>is<span class=\"token punctuation\">,<\/span> line<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Received from server: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> line <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u6e05\u7a7a\u7f13\u51b2\u533a<\/span><br \/>\n                    buffer_<span class=\"token punctuation\">.<\/span><span class=\"token function\">consume<\/span><span class=\"token punctuation\">(<\/span>length<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8bfb\u53d6\u6570\u636e<\/span><br \/>\n                    <span class=\"token function\">do_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">else<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    std<span class=\"token operator\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Read failed: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> ec<span class=\"token punctuation\">.<\/span><span class=\"token function\">message<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    tcp<span class=\"token operator\">::<\/span>socket socket_<span class=\"token punctuation\">;<\/span><br \/>\n    tcp<span class=\"token operator\">::<\/span>resolver resolver_<span class=\"token punctuation\">;<\/span><br \/>\n    boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>streambuf buffer_<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        boost<span class=\"token operator\">::<\/span>asio<span class=\"token operator\">::<\/span>io_context io_context<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> c <span class=\"token operator\">&#061;<\/span> std<span class=\"token operator\">::<\/span>make_shared<span class=\"token operator\">&lt;<\/span>client<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>io_context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        c<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;8080&#034;<\/span><span class=\"token punctuation\">)<\/span><span 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