{"id":109770,"date":"2026-09-24T22:08:45","date_gmt":"2026-09-24T14:08:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/109770.html"},"modified":"2026-09-24T22:08:45","modified_gmt":"2026-09-24T14:08:45","slug":"c-%e4%bb%bf-muduo-%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%e6%97%a5%e5%bf%97%e6%a8%a1%e5%9d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/109770.html","title":{"rendered":"C++ \u4eff muduo \u9ad8\u5e76\u53d1\u670d\u52a1\u5668:\u65e5\u5fd7\u6a21\u5757"},"content":{"rendered":"<h2>C&#043;&#043; \u4eff muduo \u9ad8\u5e76\u53d1\u670d\u52a1\u5668:\u65e5\u5fd7\u6a21\u5757<\/h2>\n<hr \/>\n<h3>1. \u4ee3\u7801\u603b\u89c8<\/h3>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">INF<\/span> <span class=\"token expression\"><span class=\"token number\">0<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">DBG<\/span> <span class=\"token expression\"><span class=\"token number\">1<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">ERR<\/span> <span class=\"token expression\"><span class=\"token number\">2<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">LOG_LEVEL<\/span> <span class=\"token expression\">INF<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>level<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/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\">do<\/span> <span class=\"token punctuation\">{<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>level <span class=\"token operator\">&lt;<\/span> LOG_LEVEL<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\">time_t t <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">tm<\/span><span class=\"token operator\">*<\/span> ltm <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">localtime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">char<\/span> tmp<span class=\"token punctuation\">[<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">strftime<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">,<\/span> <span class=\"token number\">31<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;%H:%M:%S&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> ltm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stdout<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;[%s %s:%d] &#034;<\/span> <span class=\"token expression\">format <\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> tmp<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__FILE__<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__LINE__<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n<span class=\"token expression\"><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">INF_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>INF<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">DBG_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>DBG<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">ERR_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>ERR<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">INF_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;s&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u5957\u7b80\u5355\u7684\u65e5\u5fd7\u5b8f&#xff0c;\u652f\u6301&#xff1a;<\/p>\n<ul>\n<li>\u65e5\u5fd7\u7ea7\u522b&#xff1a;INF\u3001DBG\u3001ERR<\/li>\n<li>\u53ef\u53d8\u53c2\u6570&#xff1a;\u50cf printf \u4e00\u6837\u683c\u5f0f\u5316\u8f93\u51fa<\/li>\n<li>\u81ea\u52a8\u9644\u52a0\u65f6\u95f4\u3001\u6587\u4ef6\u540d\u3001\u884c\u53f7<\/li>\n<li>\u901a\u8fc7 LOG_LEVEL \u63a7\u5236\u8f93\u51fa\u7ea7\u522b<\/li>\n<\/ul>\n<hr \/>\n<h3>2. \u4e3a\u4ec0\u4e48\u9700\u8981\u65e5\u5fd7\u5b8f&#xff1f;<\/h3>\n<p>\u5728\u670d\u52a1\u5668\u5f00\u53d1\u4e2d&#xff0c;\u65e5\u5fd7\u662f\u6392\u67e5\u95ee\u9898\u7684\u91cd\u8981\u624b\u6bb5\u3002<br \/>\n\u4f46\u76f4\u63a5\u5199 printf \u6709\u51e0\u4e2a\u95ee\u9898&#xff1a;<\/p>\n<li>\u65e0\u6cd5\u63a7\u5236\u7ea7\u522b&#xff1a;\u8c03\u8bd5\u4fe1\u606f\u3001\u9519\u8bef\u4fe1\u606f\u6df7\u5728\u4e00\u8d77\u3002<\/li>\n<li>\u7f3a\u5c11\u4e0a\u4e0b\u6587&#xff1a;\u4e0d\u77e5\u9053\u65e5\u5fd7\u6765\u81ea\u54ea\u4e2a\u6587\u4ef6\u3001\u54ea\u4e00\u884c\u3002<\/li>\n<li>\u4ee3\u7801\u5197\u4f59&#xff1a;\u6bcf\u6b21\u90fd\u8981\u624b\u5199\u65f6\u95f4\u3001\u6587\u4ef6\u3001\u884c\u53f7\u3002<\/li>\n<li>\u6027\u80fd\u95ee\u9898&#xff1a;\u4f4e\u7ea7\u522b\u65e5\u5fd7\u5728\u53d1\u5e03\u7248\u672c\u4e2d\u4e0d\u5e94\u8be5\u8f93\u51fa\u3002<\/li>\n<p>\u65e5\u5fd7\u5b8f\u7684\u76ee\u6807&#xff1a;<\/p>\n<ul>\n<li>\u4e00\u884c\u4ee3\u7801\u8f93\u51fa\u65e5\u5fd7\u3002<\/li>\n<li>\u81ea\u52a8\u5e26\u65f6\u95f4\u3001\u6587\u4ef6\u3001\u884c\u53f7\u3002<\/li>\n<li>\u652f\u6301\u7ea7\u522b\u8fc7\u6ee4\u3002<\/li>\n<li>\u652f\u6301\u53ef\u53d8\u53c2\u6570\u683c\u5f0f\u5316\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>3. \u9010\u884c\u62c6\u89e3<\/h3>\n<h4>3.1 \u65e5\u5fd7\u7ea7\u522b\u5b9a\u4e49<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">INF<\/span> <span class=\"token expression\"><span class=\"token number\">0<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">DBG<\/span> <span class=\"token expression\"><span class=\"token number\">1<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">ERR<\/span> <span class=\"token expression\"><span class=\"token number\">2<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">LOG_LEVEL<\/span> <span class=\"token expression\">INF<\/span><\/span><\/p>\n<ul>\n<li>INF&#xff1a;\u666e\u901a\u4fe1\u606f&#xff0c;\u7ea7\u522b\u6700\u4f4e\u3002<\/li>\n<li>DBG&#xff1a;\u8c03\u8bd5\u4fe1\u606f\u3002<\/li>\n<li>ERR&#xff1a;\u9519\u8bef\u4fe1\u606f&#xff0c;\u7ea7\u522b\u6700\u9ad8\u3002<\/li>\n<li>LOG_LEVEL&#xff1a;\u5f53\u524d\u7f16\u8bd1\u671f\u65e5\u5fd7\u7ea7\u522b&#xff0c;\u53ea\u6709 level &gt;&#061; LOG_LEVEL \u7684\u65e5\u5fd7\u624d\u4f1a\u8f93\u51fa\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u91cc LOG_LEVEL &#061; INF&#xff0c;\u8868\u793a\u6240\u6709\u65e5\u5fd7\u90fd\u8f93\u51fa\u3002<br \/>\n\u5982\u679c\u6539\u6210 LOG_LEVEL &#061; DBG&#xff0c;\u5219 INF \u65e5\u5fd7\u88ab\u8fc7\u6ee4&#xff0c;\u53ea\u8f93\u51fa DBG \u548c ERR\u3002<\/p>\n<h4>3.2 \u6838\u5fc3\u5b8f LOG<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>level<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/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\">do<\/span> <span class=\"token punctuation\">{<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>level <span class=\"token operator\">&lt;<\/span> LOG_LEVEL<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\">time_t t <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">tm<\/span><span class=\"token operator\">*<\/span> ltm <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">localtime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">char<\/span> tmp<span class=\"token punctuation\">[<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">strftime<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">,<\/span> <span class=\"token number\">31<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;%H:%M:%S&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> ltm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stdout<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;[%s %s:%d] &#034;<\/span> <span class=\"token expression\">format <\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> tmp<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__FILE__<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__LINE__<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n<span class=\"token expression\"><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p>\u9010\u90e8\u5206\u89e3\u91ca&#xff1a;<\/p>\n<h5>3.2.1 do { &#8230; } while(0)<\/h5>\n<p>\u5b8f\u4f53\u7528 do { &#8230; } while(0) \u5305\u88f9&#xff0c;\u662f C\/C&#043;&#043; \u5b8f\u7684\u7ecf\u5178\u6280\u5de7\u3002<br \/>\n\u597d\u5904&#xff1a;<\/p>\n<ul>\n<li>\u4fdd\u8bc1\u5b8f\u5c55\u5f00\u540e\u662f\u4e00\u4e2a\u8bed\u53e5\u5757&#xff0c;\u53ef\u4ee5\u5b89\u5168\u5730\u7528\u5728 if\/else \u4e2d\u3002<\/li>\n<li>\u907f\u514d\u5206\u53f7\u95ee\u9898\u3002<\/li>\n<li>\u5185\u90e8\u53ef\u4ee5\u4f7f\u7528 break \u63d0\u524d\u9000\u51fa\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cond<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>INF<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p>\u5982\u679c\u6ca1\u6709 do&#8230;while(0)&#xff0c;\u5c55\u5f00\u540e\u53ef\u80fd\u51fa\u9519\u3002<\/p>\n<h5>3.2.2 \u65e5\u5fd7\u7ea7\u522b\u8fc7\u6ee4<\/h5>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>level <span class=\"token operator\">&lt;<\/span> LOG_LEVEL<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u5982\u679c\u5f53\u524d\u65e5\u5fd7\u7ea7\u522b\u4f4e\u4e8e\u8bbe\u5b9a\u7ea7\u522b&#xff0c;\u76f4\u63a5 break \u8df3\u51fa do&#8230;while&#xff0c;\u4e0d\u8f93\u51fa\u3002<\/li>\n<li>\u56e0\u4e3a\u662f\u7f16\u8bd1\u671f\u5e38\u91cf\u6bd4\u8f83&#xff0c;\u7f16\u8bd1\u5668\u53ef\u80fd\u4f18\u5316\u6389\u4f4e\u7ea7\u522b\u65e5\u5fd7\u3002<\/li>\n<\/ul>\n<h5>3.2.3 \u83b7\u53d6\u5f53\u524d\u65f6\u95f4<\/h5>\n<p>time_t t <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">tm<\/span><span class=\"token operator\">*<\/span> ltm <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">localtime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> tmp<span class=\"token punctuation\">[<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">strftime<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">,<\/span> <span class=\"token number\">31<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;%H:%M:%S&#034;<\/span><span class=\"token punctuation\">,<\/span> ltm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>time(NULL)&#xff1a;\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233\u3002<\/li>\n<li>localtime(&amp;t)&#xff1a;\u8f6c\u6362\u4e3a\u672c\u5730\u65f6\u95f4\u7ed3\u6784\u4f53 struct tm\u3002<\/li>\n<li>strftime&#xff1a;\u683c\u5f0f\u5316\u65f6\u95f4\u4e3a HH:MM:SS \u5b57\u7b26\u4e32&#xff0c;\u5b58\u5165 tmp\u3002<\/li>\n<li>tmp[32]&#xff1a;\u8db3\u591f\u5bb9\u7eb3\u65f6\u95f4\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f&#xff1a;localtime \u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684&#xff0c;\u591a\u7ebf\u7a0b\u73af\u5883\u5efa\u8bae\u7528 localtime_r\u3002<br \/>\n\u4f46\u5728\u7b80\u5355\u65e5\u5fd7\u4e2d&#xff0c;\u901a\u5e38\u53ef\u4ee5\u63a5\u53d7\u3002<\/p>\n<h5>3.2.4 \u683c\u5f0f\u5316\u8f93\u51fa<\/h5>\n<p><span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stdout<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;[%s %s:%d] &#034;<\/span> format <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> tmp<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__FILE__<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__LINE__<\/span><span class=\"token punctuation\">,<\/span> ##__VA_ARGS__<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>stdout&#xff1a;\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa\u3002<\/li>\n<li>&#034;[%s %s:%d] &#034; format &#034;\\\\n&#034;&#xff1a;\u628a\u56fa\u5b9a\u683c\u5f0f\u548c\u7528\u6237\u4f20\u5165\u7684 format \u62fc\u63a5\u3002<\/li>\n<li>tmp&#xff1a;\u65f6\u95f4\u5b57\u7b26\u4e32\u3002<\/li>\n<li>__FILE__&#xff1a;\u5f53\u524d\u6e90\u6587\u4ef6\u540d&#xff0c;\u9884\u5b9a\u4e49\u5b8f\u3002<\/li>\n<li>__LINE__&#xff1a;\u5f53\u524d\u884c\u53f7&#xff0c;\u9884\u5b9a\u4e49\u5b8f\u3002<\/li>\n<li>##__VA_ARGS__&#xff1a;GNU \u6269\u5c55&#xff0c;\u5904\u7406\u53ef\u53d8\u53c2\u6570\u4e3a\u7a7a\u7684\u60c5\u51b5&#xff0c;\u5220\u9664\u524d\u9762\u7684\u9017\u53f7\u3002<\/li>\n<\/ul>\n<p>\u8f93\u51fa\u683c\u5f0f\u7c7b\u4f3c&#xff1a;<\/p>\n<p>[14:23:45 server.cpp:10] hello<\/p>\n<h4>3.3 \u4e09\u4e2a\u5c01\u88c5\u5b8f<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">INF_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>INF<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">DBG_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>DBG<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">ERR_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>ERR<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<ul>\n<li>INF_LOG&#xff1a;\u8f93\u51fa\u666e\u901a\u4fe1\u606f\u3002<\/li>\n<li>DBG_LOG&#xff1a;\u8f93\u51fa\u8c03\u8bd5\u4fe1\u606f\u3002<\/li>\n<li>ERR_LOG&#xff1a;\u8f93\u51fa\u9519\u8bef\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u65f6&#xff1a;<\/p>\n<p><span class=\"token function\">INF_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;server start&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">DBG_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client fd &#061; %d&#034;<\/span><span class=\"token punctuation\">,<\/span> fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept failed: %s&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>4. \u5173\u952e\u77e5\u8bc6\u70b9<\/h3>\n<h4>4.1 \u53ef\u53d8\u53c2\u6570\u5b8f<\/h4>\n<p>C&#043;&#043;11 \u8d77\u652f\u6301\u53ef\u53d8\u53c2\u6570\u5b8f&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<ul>\n<li>&#8230; \u8868\u793a\u53ef\u53d8\u53c2\u6570\u3002<\/li>\n<li>__VA_ARGS__ \u5728\u5b8f\u5c55\u5f00\u65f6\u66ff\u6362\u4e3a\u5b9e\u9645\u53c2\u6570\u3002<\/li>\n<li>##__VA_ARGS__ \u662f GNU \u6269\u5c55&#xff0c;\u5f53\u53ef\u53d8\u53c2\u6570\u4e3a\u7a7a\u65f6\u5220\u9664\u524d\u9762\u7684\u9017\u53f7&#xff0c;\u907f\u514d printf(format, ) \u8bed\u6cd5\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p>C&#043;&#043;20 \u63d0\u4f9b\u4e86 __VA_OPT__&#xff0c;\u4f46\u5f88\u591a\u9879\u76ee\u4ecd\u4f7f\u7528 ##__VA_ARGS__\u3002<\/p>\n<h4>4.2 \u9884\u5b9a\u4e49\u5b8f<\/h4>\n<ul>\n<li>__FILE__&#xff1a;\u5f53\u524d\u6e90\u6587\u4ef6\u540d\u3002<\/li>\n<li>__LINE__&#xff1a;\u5f53\u524d\u884c\u53f7\u3002<\/li>\n<li>__func__&#xff1a;\u5f53\u524d\u51fd\u6570\u540d&#xff08;C&#043;&#043;11&#xff09;\u3002<\/li>\n<li>__DATE__\u3001__TIME__&#xff1a;\u7f16\u8bd1\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u5b8f\u7531\u7f16\u8bd1\u5668\u81ea\u52a8\u63d0\u4f9b&#xff0c;\u975e\u5e38\u9002\u5408\u65e5\u5fd7\u3002<\/p>\n<h4>4.3 do\u2026while(0) \u6280\u5de7<\/h4>\n<p>\u4e3a\u4ec0\u4e48\u4e0d\u7528 {} \u800c\u7528 do&#8230;while(0)&#xff1f;<\/p>\n<ul>\n<li>{} \u5c55\u5f00\u540e\u53ef\u80fd\u548c\u5916\u90e8 if\/else \u4ea7\u751f\u60ac\u7a7a else \u95ee\u9898\u3002<\/li>\n<li>do&#8230;while(0) \u662f\u4e00\u4e2a\u5b8c\u6574\u8bed\u53e5&#xff0c;\u672b\u5c3e\u9700\u8981\u5206\u53f7&#xff0c;\u884c\u4e3a\u66f4\u4e00\u81f4\u3002<\/li>\n<li>\u5185\u90e8\u53ef\u4ee5\u7528 break \u8df3\u51fa&#xff0c;\u76f8\u5f53\u4e8e\u63d0\u524d\u8fd4\u56de\u3002<\/li>\n<\/ul>\n<h4>4.4 \u65e5\u5fd7\u7ea7\u522b\u8fc7\u6ee4<\/h4>\n<p>\u65e5\u5fd7\u7ea7\u522b\u6570\u503c\u8d8a\u5927\u8d8a\u4e25\u91cd&#xff1a;<\/p>\n<ul>\n<li>INF&#061;0&#xff1a;\u4fe1\u606f<\/li>\n<li>DBG&#061;1&#xff1a;\u8c03\u8bd5<\/li>\n<li>ERR&#061;2&#xff1a;\u9519\u8bef<\/li>\n<\/ul>\n<p>LOG_LEVEL \u63a7\u5236\u6700\u4f4e\u8f93\u51fa\u7ea7\u522b\u3002<br \/>\n\u4f8b\u5982 LOG_LEVEL&#061;DBG&#xff0c;\u5219 INF \u4e0d\u8f93\u51fa&#xff0c;DBG \u548c ERR \u8f93\u51fa\u3002<\/p>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u5728\u7f16\u8bd1\u671f\u51b3\u5b9a&#xff0c;\u4f4e\u7ea7\u522b\u65e5\u5fd7\u53ef\u4ee5\u88ab\u7f16\u8bd1\u5668\u4f18\u5316\u6389&#xff0c;\u51cf\u5c11\u8fd0\u884c\u65f6\u5f00\u9500\u3002<\/p>\n<hr \/>\n<h3>5. \u4f7f\u7528\u793a\u4f8b<\/h3>\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;cstdio&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;ctime&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;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">INF<\/span> <span class=\"token expression\"><span class=\"token number\">0<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">DBG<\/span> <span class=\"token expression\"><span class=\"token number\">1<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">ERR<\/span> <span class=\"token expression\"><span class=\"token number\">2<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">LOG_LEVEL<\/span> <span class=\"token expression\">INF<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>level<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/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\">do<\/span> <span class=\"token punctuation\">{<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>level <span class=\"token operator\">&lt;<\/span> LOG_LEVEL<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\">time_t t <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">tm<\/span><span class=\"token operator\">*<\/span> ltm <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">localtime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token keyword\">char<\/span> tmp<span class=\"token punctuation\">[<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">strftime<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">,<\/span> <span class=\"token number\">31<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;%H:%M:%S&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> ltm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stdout<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token string\">&#034;[%s %s:%d] &#034;<\/span> <span class=\"token expression\">format <\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> tmp<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__FILE__<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">__LINE__<\/span><span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n<span class=\"token expression\"><span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">INF_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>INF<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">DBG_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>DBG<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">ERR_LOG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>format<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>ERR<span class=\"token punctuation\">,<\/span> format<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">INF_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;server start&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">DBG_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client fd &#061; %d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">ERR_LOG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept failed: %s&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u793a\u4f8b&#xff1a;<\/p>\n<p>[14:23:45 server.cpp:20] server start<br \/>\n[14:23:45 server.cpp:21] client fd &#061; 10<br \/>\n[14:23:45 server.cpp:22] accept failed: No such file or directory<\/p>\n<hr \/>\n<h3>6. \u603b\u7ed3<\/h3>\n<p>\u8fd9\u6bb5\u65e5\u5fd7\u5b8f\u867d\u7136\u7b80\u5355&#xff0c;\u4f46\u5305\u542b\u4e86\u591a\u4e2a C\/C&#043;&#043; 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