{"id":126409,"date":"2024-03-24T22:19:37","date_gmt":"2024-03-24T13:19:37","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/netinet%e3%80%81netdb%e3%81%8c%e8%a6%8b%e3%81%a4%e3%81%8b%e3%82%8a%e3%81%be%e3%81%9b%e3%82%93-c%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%83%a9%e3%82%a4%e3%83%96%e3%83%a9%e3%83%aa\/"},"modified":"2024-03-28T10:05:30","modified_gmt":"2024-03-28T01:05:30","slug":"netinet%e3%80%81netdb%e3%81%8c%e8%a6%8b%e3%81%a4%e3%81%8b%e3%82%8a%e3%81%be%e3%81%9b%e3%82%93-c%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%83%a9%e3%82%a4%e3%83%96%e3%83%a9%e3%83%aa","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/netinet%e3%80%81netdb%e3%81%8c%e8%a6%8b%e3%81%a4%e3%81%8b%e3%82%8a%e3%81%be%e3%81%9b%e3%82%93-c%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%83%a9%e3%82%a4%e3%83%96%e3%83%a9%e3%83%aa\/","title":{"rendered":"Netinet\u3001NetDB\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093 C++\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30a4\u30d6\u30e9\u30ea"},"content":{"rendered":"<p>C\u8a00\u8a9e\u5411\u3051\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3042\u308bnetinet\u3068netdb\u306f\u3001C++\u3067\u306f\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb&lt;sys\/socket.h&gt;\u3068\u3092\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3059\u308b\u3053\u3068\u3067\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b&lt;sys\/socket.h&gt; \u3068 \u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/socket.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;netdb.h&gt;<\/span><\/span>\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2asocket<\/span>\r\n<span class=\"hljs-type\">int<\/span> serverSocket = <span class=\"hljs-built_in\">socket<\/span>(AF_INET, SOCK_STREAM, <span class=\"hljs-number\">0<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (serverSocket == <span class=\"hljs-number\">-1<\/span>) {\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Error creating socket.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6IP\u5730\u5740<\/span>\r\n<span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">hostent<\/span>* host = <span class=\"hljs-built_in\">gethostbyname<\/span>(<span class=\"hljs-string\">\"www.example.com\"<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (host == <span class=\"hljs-literal\">nullptr<\/span>) {\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Error retrieving IP address.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">in_addr<\/span>** addressList = (<span class=\"hljs-keyword\">struct<\/span> in_addr**)host-&gt;h_addr_list;\r\nstd::string ipAddress = <span class=\"hljs-built_in\">inet_ntoa<\/span>(*addressList[<span class=\"hljs-number\">0<\/span>]);\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"IP address: \"<\/span> &lt;&lt; ipAddress &lt;&lt; std::endl;\r\n<span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u5230\u670d\u52a1\u5668<\/span>\r\n<span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">sockaddr_in<\/span> serverAddress;\r\nserverAddress.sin_family = AF_INET;\r\nserverAddress.sin_port = <span class=\"hljs-built_in\">htons<\/span>(<span class=\"hljs-number\">80<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">inet_pton<\/span>(AF_INET, ipAddress.<span class=\"hljs-built_in\">c_str<\/span>(), &amp;(serverAddress.sin_addr)) &lt;= <span class=\"hljs-number\">0<\/span>) {\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Invalid IP address.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">connect<\/span>(serverSocket, (<span class=\"hljs-keyword\">struct<\/span> sockaddr*)&amp;serverAddress, <span class=\"hljs-built_in\">sizeof<\/span>(serverAddress)) &lt; <span class=\"hljs-number\">0<\/span>) {\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Error connecting to server.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u53d1\u9001\u6570\u636e<\/span>\r\nstd::string message = <span class=\"hljs-string\">\"GET \/ HTTP\/1.1\\r\\nHost: www.example.com\\r\\n\\r\\n\"<\/span>;\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">send<\/span>(serverSocket, message.<span class=\"hljs-built_in\">c_str<\/span>(), message.<span class=\"hljs-built_in\">length<\/span>(), <span class=\"hljs-number\">0<\/span>) &lt; <span class=\"hljs-number\">0<\/span>) {\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Error sending data.\"<\/span> &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u63a5\u6536\u670d\u52a1\u5668\u54cd\u5e94<\/span>\r\n<span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">4096<\/span>];\r\nstd::string response;\r\n<span class=\"hljs-keyword\">while<\/span> (<span class=\"hljs-literal\">true<\/span>) {\r\n<span class=\"hljs-built_in\">memset<\/span>(buffer, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-built_in\">sizeof<\/span>(buffer));\r\n<span class=\"hljs-type\">int<\/span> bytesRead = <span class=\"hljs-built_in\">recv<\/span>(serverSocket, buffer, <span class=\"hljs-built_in\">sizeof<\/span>(buffer) - <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (bytesRead &lt;= <span class=\"hljs-number\">0<\/span>) {\r\n<span class=\"hljs-keyword\">break<\/span>;\r\n}\r\nresponse += buffer;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5173\u95edsocket<\/span>\r\n<span class=\"hljs-built_in\">close<\/span>(serverSocket);\r\n<span class=\"hljs-comment\">\/\/ \u6253\u5370\u670d\u52a1\u5668\u54cd\u5e94<\/span>\r\nstd::cout &lt;&lt; response &lt;&lt; std::endl;\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30bd\u30b1\u30c3\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3001\u6b21\u306bgethostbyname\u3092\u4f7f\u7528\u3057\u3066www.example.com\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3001\u6b21\u306bconnect\u3092\u4f7f\u7528\u3057\u3066\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3001\u6b21\u306bHTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u4fe1\u3057\u3066\u30b5\u30fc\u30d0\u30fc\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u53d7\u4fe1\u3057\u3001\u6700\u5f8c\u306b\u30bd\u30b1\u30c3\u30c8\u3092\u9589\u3058\u3066\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3001\u3053\u308c\u306f\u5358\u306a\u308b\u7c21\u5358\u306a\u4f8b\u3067\u3059\u3002\u5b9f\u969b\u306eWeb\u30e9\u30a4\u30d6\u30e9\u30ea\u4f7f\u7528\u306b\u306f\u3001\u3088\u308a\u591a\u304f\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u3068\u30ed\u30b8\u30c3\u30af\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u8a00\u8a9e\u5411\u3051\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3042\u308bnetinet\u3068netdb\u306f\u3001C++\u3067\u306f\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb&lt;sys\/socket.h&gt;\u3068\u3092\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3059\u308b\u3053\u3068\u3067\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b&#038;l [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-126409","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Netinet\u3001NetDB\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093 C++\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30e9\u30a4\u30d6\u30e9\u30ea - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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