{"id":208149,"date":"2025-07-08T11:24:11","date_gmt":"2025-07-08T03:24:11","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208149\/"},"modified":"2025-07-08T11:24:11","modified_gmt":"2025-07-08T03:24:11","slug":"golang%e5%8f%8d%e5%b0%84methodbyname","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208149\/","title":{"rendered":"Golang\u53cd\u5c04MethodByName()"},"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>Golang\u53cd\u5c04MethodByName()<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-29 16:00:32<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aGolang\u53cd\u5c04MethodByName()\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u7f16\u5199\u4e86\u6839\u636e\u6570\u636e\u7ed3\u6784\u7684\u7c7b\u578b\u586b\u5145\u6570\u636e\u7ed3\u6784\u7684\u4ee3\u7801\u3002\u6211\u9700\u8981\u8c03\u7528\u5d4c\u5957\u7ed3\u6784\u51fd\u6570\uff08\u5982\u679c\u5b58\u5728\uff09\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u5728\u5b57\u6bb5\u6b63\u786e\u7684\u60c5\u51b5\u4e0b\u67e5\u627e\u51fd\u6570\u65f6\u5f97\u5230\u7684\u503c\u4e3a\u96f6\uff1f<\/p>\n<pre>type (\n\n    SomeData struct {\n        Val NestedType\n    }\n\n    NestedType struct {\n        V1 string\n    }\n)\n\nfunc (t *NestedType) FillData(v int) {\n    t.V1 = fmt.Sprintf(\"Here is %v\", v)\n}\n\nfunc main() {\n\n    i := SomeData{}\n\n    reflect.ValueOf(&amp;i.Val).MethodByName(\"FillData\").Call([]reflect.Value{reflect.ValueOf(555)})\n    fmt.Println(i) \/\/\/ {{I hate 555}}\n\n\n    \/\/ BUT!\n\n    v := 666\n\n    newObj := reflect.New(reflect.TypeOf(SomeData{}))\n\n    fVal := newObj.Elem().FieldByName(\"Val\")\n    fmt.Println( \"fVal.NumField():\", fVal.NumField()) \/\/fVal.NumField(): 1\n\n\n    f := fVal.MethodByName(\"FillData\")\n    f.Call([]reflect.Value{reflect.ValueOf(v)}) \/\/panic: reflect: call of reflect.Value.Call on zero Value\n\n\n}<\/pre>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u8be5\u65b9\u6cd5\u4f4d\u4e8e\u6307\u9488\u63a5\u6536\u5668\u4e0a\u3002\u503c <code>fval<\/code> \u662f <code>nestedtype<\/code>\u3002\u62e8\u6253\u83b7\u53d6<code>*nestedtype<\/code>\uff1a<\/p>\n<pre>f := fVal.Addr().MethodByName(\"FillData\")<\/pre>\n<p>\u3002<\/p>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8eGolang\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/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-208149","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208149","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=208149"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208149\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208149"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208149"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208149"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}