{"id":77135,"date":"2024-03-20T18:03:20","date_gmt":"2024-03-20T09:03:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8budp%e9%80%9a%e4%bf%a1%e3%81%ae%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/"},"modified":"2025-08-11T20:01:45","modified_gmt":"2025-08-11T11:01:45","slug":"c%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8budp%e9%80%9a%e4%bf%a1%e3%81%ae%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8budp%e9%80%9a%e4%bf%a1%e3%81%ae%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/","title":{"rendered":"C++\u306b\u304a\u3051\u308bUDP\u901a\u4fe1\u306e\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002"},"content":{"rendered":"<p>C++\u306b\u304a\u3051\u308bUDP\u901a\u4fe1\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4e3b\u306b2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b: UDP\u901a\u4fe1\u306b\u306f\u3001C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306esocket\u3001bind\u3001sendto\u3001recvfrom\u306a\u3069\u306e\u95a2\u6570\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u307e\u305a\u3001UDP\u30bd\u30b1\u30c3\u30c8\u3092\u4f5c\u6210\u3057\u3001bind\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30bd\u30b1\u30c3\u30c8\u3092\u30ed\u30fc\u30ab\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u306b\u30d0\u30a4\u30f3\u30c9\u3057\u307e\u3059\u3002\u6b21\u306b\u3001sendto\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3057\u3001recvfrom\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb&lt;sys\/socket.h&gt;\u3068&lt;arpa\/inet.h&gt;\u3092\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\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;arpa\/inet.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;unistd.h&gt;<\/span><\/span>\r\n\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-type\">int<\/span> socket_fd;\r\n    <span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">sockaddr_in<\/span> server_addr, client_addr;\r\n    <span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">1024<\/span>];\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efaUDP\u5957\u63a5\u5b57<\/span>\r\n    socket_fd = <span class=\"hljs-built_in\">socket<\/span>(AF_INET, SOCK_DGRAM, <span class=\"hljs-number\">0<\/span>);\r\n    <span class=\"hljs-keyword\">if<\/span> (socket_fd &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to create socket\"<\/span> &lt;&lt; std::endl;\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7ed1\u5b9a\u672c\u5730IP\u5730\u5740\u548c\u7aef\u53e3\u53f7<\/span>\r\n    server_addr.sin_family = AF_INET;\r\n    server_addr.sin_addr.s_addr = INADDR_ANY;\r\n    server_addr.sin_port = <span class=\"hljs-built_in\">htons<\/span>(<span class=\"hljs-number\">12345<\/span>);\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">bind<\/span>(socket_fd, (<span class=\"hljs-keyword\">struct<\/span> sockaddr*)&amp;server_addr, <span class=\"hljs-built_in\">sizeof<\/span>(server_addr)) &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to bind socket\"<\/span> &lt;&lt; std::endl;\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u63a5\u6536\u6570\u636e\u5305<\/span>\r\n    <span class=\"hljs-type\">socklen_t<\/span> client_addr_len = <span class=\"hljs-built_in\">sizeof<\/span>(client_addr);\r\n    <span class=\"hljs-type\">ssize_t<\/span> recv_len = <span class=\"hljs-built_in\">recvfrom<\/span>(socket_fd, buffer, <span class=\"hljs-built_in\">sizeof<\/span>(buffer), <span class=\"hljs-number\">0<\/span>, (<span class=\"hljs-keyword\">struct<\/span> sockaddr*)&amp;client_addr, &amp;client_addr_len);\r\n    <span class=\"hljs-keyword\">if<\/span> (recv_len &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to receive data\"<\/span> &lt;&lt; std::endl;\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n\r\n    buffer[recv_len] = <span class=\"hljs-string\">'\\0'<\/span>;\r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"Received message: \"<\/span> &lt;&lt; buffer &lt;&lt; std::endl;\r\n\r\n    <span class=\"hljs-built_in\">close<\/span>(socket_fd);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u5229\u7528\uff1a\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066UDP\u901a\u4fe1\u51e6\u7406\u3092\u7c21\u7565\u5316\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Boost\u30e9\u30a4\u30d6\u30e9\u30ea\u306easio\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066UDP\u901a\u4fe1\u3092\u884c\u3044\u307e\u3059\u3002asio\u30e9\u30a4\u30d6\u30e9\u30ea\u306fUDP\u30bd\u30b1\u30c3\u30c8\u306e\u4f5c\u6210\u3001\u30d0\u30a4\u30f3\u30c9\u3001\u9001\u4fe1\u3001\u53d7\u4fe1\u306a\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u6a5f\u80fd\u3092\u8c4a\u5bcc\u306b\u5099\u3048\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\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;boost\/asio.hpp&gt;<\/span><\/span>\r\n\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    boost::asio::io_context io_context;\r\n    boost::asio::ip::<span class=\"hljs-function\">udp::socket <span class=\"hljs-title\">socket<\/span><span class=\"hljs-params\">(io_context, boost::asio::ip::udp::endpoint(boost::asio::ip::udp::v4(), <span class=\"hljs-number\">12345<\/span>))<\/span><\/span>;\r\n\r\n    <span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">1024<\/span>];\r\n    boost::asio::ip::udp::endpoint remote_endpoint;\r\n    boost::system::error_code error;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u63a5\u6536\u6570\u636e\u5305<\/span>\r\n    <span class=\"hljs-type\">size_t<\/span> recv_len = socket.<span class=\"hljs-built_in\">receive_from<\/span>(boost::asio::<span class=\"hljs-built_in\">buffer<\/span>(buffer), remote_endpoint, <span class=\"hljs-number\">0<\/span>, error);\r\n    <span class=\"hljs-keyword\">if<\/span> (error) {\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to receive data: \"<\/span> &lt;&lt; error.<span class=\"hljs-built_in\">message<\/span>() &lt;&lt; std::endl;\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n\r\n    buffer[recv_len] = <span class=\"hljs-string\">'\\0'<\/span>;\r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"Received message: \"<\/span> &lt;&lt; buffer &lt;&lt; std::endl;\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>UDP\u901a\u4fe1\u3092\u884c\u3046\u4e00\u822c\u7684\u306a\u65b9\u6cd5\u304cC++\u30672\u3064\u3042\u308a\u3001\u3069\u3061\u3089\u3092\u9078\u629e\u3059\u308b\u304b\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u30cb\u30fc\u30ba\u3084\u597d\u307f\u306b\u5fdc\u3058\u3066\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C++\u306b\u304a\u3051\u308bUDP\u901a\u4fe1\u306e\u5b9f\u88c5\u65b9\u6cd5\u306f\u4e3b\u306b2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002 \u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b: UDP\u901a\u4fe1\u306b\u306f\u3001C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306esocket\u3001bind\u3001sendto\u3001recvfrom\u306a\u3069\u306e\u95a2\u6570\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u307e\u305a\u3001UDP [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-77135","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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>C++\u306b\u304a\u3051\u308bUDP\u901a\u4fe1\u306e\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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