{"id":206985,"date":"2025-07-08T09:01:19","date_gmt":"2025-07-08T01:01:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206985\/"},"modified":"2025-07-08T09:01:19","modified_gmt":"2025-07-08T01:01:19","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e6%88%91%e4%b8%8d%e8%83%bd%e4%bd%bf%e7%94%a8-flag-stringvar-%e5%b0%86%e6%8c%87%e9%92%88%e4%bc%a0%e9%80%92%e7%bb%99-fmt-println%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206985\/","title":{"rendered":"\u4e3a\u4ec0\u4e48\u6211\u4e0d\u80fd\u4f7f\u7528 flag.StringVar \u5c06\u6307\u9488\u4f20\u9012\u7ed9 fmt.Println\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>\u4e3a\u4ec0\u4e48\u6211\u4e0d\u80fd\u4f7f\u7528 flag.StringVar \u5c06\u6307\u9488\u4f20\u9012\u7ed9 fmt.Println\uff1f<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-19 11:42:32<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u4e3a\u4ec0\u4e48\u6211\u4e0d\u80fd\u4f7f\u7528 flag.StringVar \u5c06\u6307\u9488\u4f20\u9012\u7ed9 fmt.Println\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\uff0c\u6216\u8005\u662f\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">Golang<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u5f00\u59cb\u7814\u7a76 golang\uff0c\u5e76\u6309\u7167\u4f20\u9012\u547d\u4ee4\u884c\u53c2\u6570\u7684\u793a\u4f8b\uff0c\u6211\u5f97\u5230\u4e86\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre>package main\n\nimport (\n    \"flag\"\n    \"fmt\"\n)\n\nfunc main() {\n\n    wordptr := flag.string(\"namestring\", \"stringvalue\", \"pass in a string\")\n    numptr := flag.int(\"number\", 11, \"pass in an int\")\n    boolptr := flag.bool(\"switchflag\", false, \"pass in a bool\")\n    var svar string\n    flag.stringvar(&amp;svar, \"svar\", \"svarstringvalue\", \"a string variable\")\n    flag.parse()\n\n    fmt.println(\"word:\", *wordptr)\n    fmt.println(\"word2:\", wordptr)\n    fmt.println(\"numb:\", *numptr)\n    fmt.println(\"numb2\", numptr)\n    fmt.println(\"switchflag\", *boolptr)\n    fmt.println(\"switchflag2\", boolptr)\n    fmt.println(\"svar:\", svar)\n    fmt.println(\"svar2\", &amp;svar)\n    fmt.println(\"svar3\", *svar) \/\/&lt;-- this won't work...\n    fmt.println(\"tail:\", flag.args())\n\n}<\/pre>\n<p>\u6211\u7684\u95ee\u9898\u662f\uff0c\u5982\u679c\u6211\u53d6\u6d88\u5f15\u7528\u5b83\uff08\u4f8b\u5982 <code>*wordptr<\/code> \u7b49\uff09\uff0c\u4e3a\u4ec0\u4e48\u6211\u4f1a\u5f97\u5230\u5176\u4ed6\u6307\u9488\u7684\u503c\uff0c\u800c\u5982\u679c\u6211\u4f20\u9012 <code>wordptr<\/code> \uff0c\u6211\u4f1a\u5f97\u5230\u5185\u5b58\u5730\u5740\uff0c\u4f46\u662f\u5bf9\u4e8e <code>svar<\/code> \uff0c\u6211\u5fc5\u987b\u4f20\u9012\u5728 <code>svar<\/code> \u4e2d\u83b7\u53d6\u503c\uff0c\u800c <code>&amp;svar<\/code> \u83b7\u53d6\u5185\u5b58\u5730\u5740\uff1f<\/p>\n<p>\u770b\u770b\u8fd9\u91cc\u7684\u6587\u6863https:\/\/golang.org\/pkg\/flag\/\uff0c\u5b83\u8bf4\u4f60\u4f20\u5165\u4e00\u4e2a\u53d8\u91cf\u6765\u5b58\u50a8\u6807\u5fd7\uff08\u5927\u6982\u662f\u4e00\u4e2a\u5df2\u7ecf\u521b\u5efa\u7684\u53d8\u91cf\uff1f\uff09\uff0c\u4f46\u6211\u4ecd\u7136\u4e0d\u77e5\u9053\u4e0e\u5176\u4ed6\u53d8\u91cf\u76f8\u6bd4\uff0c\u7406\u89e3\u4e3a\u4ec0\u4e48\u6211\u5fc5\u987b\u5bf9\u5b83\u505a\u4e00\u4e9b\u4e0d\u540c\u7684\u4e8b\u60c5\u624d\u80fd\u83b7\u5f97\u503c\u3002 <\/p>\n<p>\u8fd9\u662f\u6211\u8fd0\u884c\u5b83\u5e76\u4f20\u9012\u4e00\u4e9b\u547d\u4ee4\u7684\u7ed3\u679c\uff1a<\/p>\n<pre>  Documents go run main.go -number 42 -switchflag -svar testtringvalue\nWord: stringvalue\nWord2: 0xc42005c1e0\nnumb: 42\nnumb2 0xc4200160a0\nswitchflag true\nswitchflag2 0xc4200160a8\nsvar: testtringvalue\nsvar2 0xc42005c1f0\ntail: []<\/pre>\n<p>\u611f\u8c22\u4efb\u4f55\u5e2e\u52a9\u3002\u53e6\u5916\uff0c\u5982\u679c\u6211\u7684\u7406\u89e3\u6709\u8bef\uff0c\u8bf7\u544a\u8bc9\u6211\u3002<\/p>\n<p>\u5e72\u676f\u3002<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u8fd9\u76f8\u5f53\u7b80\u5355\uff0c\u60a8\u6b63\u5728\u5c1d\u8bd5\u53d6\u6d88\u5f15\u7528\u4e00\u4e2a\u503c\u800c\u4e0d\u662f\u6307\u9488\u3002<\/p>\n<p><code>var svar string<\/code> \u4e0d\u662f\u6307\u9488\uff0c\u800c\u662f\u503c\u3002<\/p>\n<p><code>fmt.Println(\"svar3\", svar)<\/code> \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u662f\u6b63\u786e\u7684\u4f7f\u7528<\/p>\n<p>\u4e0d\u7528\u62c5\u5fc3 StringVar \u7684\u4f7f\u7528 <code>...Var(&amp;svar, \"sv...<\/code> \u610f\u5473\u7740\u60a8\u4f20\u9012\u7684\u662f <code>svar<\/code> \u7684\u5730\u5740\u800c\u4e0d\u662f\u503c\u3002<\/p>\n<p>\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u4e3a\u4ec0\u4e48\u6211\u4e0d\u80fd\u4f7f\u7528 flag.StringVar \u5c06\u6307\u9488\u4f20\u9012\u7ed9 fmt.Println\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-206985","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206985","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=206985"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206985\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}