{"id":207978,"date":"2025-07-08T16:59:36","date_gmt":"2025-07-08T08:59:36","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207978\/"},"modified":"2025-07-08T16:59:36","modified_gmt":"2025-07-08T08:59:36","slug":"%e5%a6%82%e4%bd%95%e5%88%9b%e5%bb%ba%e4%b8%80%e4%b8%aa%e8%af%bb%e5%8f%96%e5%99%a8%ef%bc%8c%e8%af%bb%e5%8f%96%e5%89%8d-n-%e4%b8%aa%e5%ad%97%e8%8a%82%e4%b8%80%e6%ac%a1%ef%bc%8c%e7%84%b6%e5%90%8e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207978\/","title":{"rendered":"\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u8bfb\u53d6\u5668\uff0c\u8bfb\u53d6\u524d N \u4e2a\u5b57\u8282\u4e00\u6b21\uff0c\u7136\u540e\u8bfb\u53d6\u5176\u4f59\u5b57\u8282\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u8bfb\u53d6\u5668\uff0c\u8bfb\u53d6\u524d N \u4e2a\u5b57\u8282\u4e00\u6b21\uff0c\u7136\u540e\u8bfb\u53d6\u5176\u4f59\u5b57\u8282\uff1f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-27 15:12:51<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300a\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u8bfb\u53d6\u5668\uff0c\u8bfb\u53d6\u524d N \u4e2a\u5b57\u8282\u4e00\u6b21\uff0c\u7136\u540e\u8bfb\u53d6\u5176\u4f59\u5b57\u8282\uff1f\u300b<\/span>\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u77e5\u8bc6\u70b9\u5305\u62ec<\/span>\u7b49\u7b49\uff0c\u65e0\u8bba\u4f60\u662f\u5c0f\u767d\u8fd8\u662f\u8001\u624b\uff0c\u90fd\u9002\u5408\u770b\u4e00\u770b\u54e6~\u6709\u597d\u7684\u5efa\u8bae\u4e5f\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u82e5\u662f\u770b\u5b8c\u6709\u6240\u6536\u83b7\uff0c\u4e5f\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u70b9\u8d5e\u652f\u6301\u5440\uff01\u4e00\u8d77\u52a0\u6cb9\u5b66\u4e60~<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u60f3\u8bfb\u53d6\u524dn\u4e2a\u5b57\u8282<\/em>\u4e00\u6b21<\/strong>\uff0c\u7136\u540e\u6211\u60f3\u8bfb\u53d6\u5176\u4f59\u90e8\u5206\u76f4\u5230io.eof<\/strong>\u3002\u60a8\u5bf9\u4ee5\u4e0b\u4ee3\u7801\u6709\u4f55\u770b\u6cd5\uff1f\u8fd9\u662f\u6700\u597d\u7684\u65b9\u6cd5\u5417\uff1f<\/p>\n

\u5982\u679c\u7ed9\u5b9a\u7684\u8bfb\u53d6\u5668 (r) \u4e0d\u662f\u4ee5\u7b2c\u4e00\u4e2a<\/strong>\u5b57\u8282\u5f00\u5934\uff0c\u5219\u5e94\u8fd4\u56de\u9519\u8bef\u3002\u5426\u5219\uff0c\u5b83\u5e94\u8be5\u7ee7\u7eed\u8bfb\u53d6\u4e00\u7ec4\u56fa\u5b9a\u5b57\u8282<\/strong>\u4e4b\u540e\u7684\u5176\u4f59\u90e8\u5206\uff08\u5728\u4ee3\u7801\u4e2d\u6807\u8bb0\u4e3a\u201cfirst\u201d\uff09\u3002<\/p>\n

\u60a8\u53ef\u4ee5\u5c06\u201c\u7b2c\u4e00\u4e2a\u201d<\/em>\u90e8\u5206\u89c6\u4e3a\u9b54\u672f\u683c\u5f0f\u7b7e\u540d\u3002<\/p>\n

type reader struct {\n    r    io.Reader\n    first []byte\n}\n\nfunc (r *reader) Read(b []byte) (n int, err error) {\n    const first = \"first\"\n\n    n, err = r.r.Read(b)\n    if len(r.first) >= len(first) {\n        return n, err\n    }\n\n    if l := len(first); n > l {\n        b = b[:l]\n    }\n    r.first = append(r.first, b...)\n\n    if len(r.first) >= len(first) {\n        if !bytes.HasPrefix(r.first, []byte(first)) {\n            err = errors.New(\"not first\")\n        }\n    }\n    return n, err\n}\n<\/pre>\n
\u6e90\u4ee3\u7801\u5728\u6f14\u793a\u4e2d\uff1ahttps:\/\/play.golang.org\/p\/4xzeqcaxyxc<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u60a8\u7684\u5b9e\u73b0\u770b\u8d77\u6765\u6bd4\u5fc5\u8981\u7684\u66f4\u590d\u6742\uff1a<\/p>\n
type reader struct {\n    r      io.Reader\n    first  []byte\n    offset int\n}\n\nfunc (r *reader) Read(b []byte) (n int, err error) {\n    n, err = r.r.Read(b)\n    for i := 0; r.offset < len(r.first) && i < n; r.offset++ {\n        if r.first[r.offset] != b[i] {\n            return n, errors.New(\"mismatch\")\n        }\n        i++\n    }\n    return n, err\n}\n<\/pre>\n
\u4ee5\u4e0a\u5c31\u662f\u300a\u5982\u4f55\u521b\u5efa\u4e00\u4e2a\u8bfb\u53d6\u5668\uff0c\u8bfb\u53d6\u524d N \u4e2a\u5b57\u8282\u4e00\u6b21\uff0c\u7136\u540e\u8bfb\u53d6\u5176\u4f59\u5b57\u8282\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/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-207978","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207978","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=207978"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207978\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}