{"id":208036,"date":"2025-07-08T09:05:49","date_gmt":"2025-07-08T01:05:49","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208036\/"},"modified":"2025-07-08T09:05:49","modified_gmt":"2025-07-08T01:05:49","slug":"%e7%b2%be%e7%a1%ae%e8%af%bb%e5%8f%96-n-%e4%b8%aa%e5%ad%97%e8%8a%82%ef%bc%8c%e9%99%a4%e9%9d%9e-eof%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208036\/","title":{"rendered":"\u7cbe\u786e\u8bfb\u53d6 n \u4e2a\u5b57\u8282\uff0c\u9664\u975e EOF\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>\u7cbe\u786e\u8bfb\u53d6 n \u4e2a\u5b57\u8282\uff0c\u9664\u975e EOF\uff1f<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-28 08:57:34<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u5728Golang\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300a\u7cbe\u786e\u8bfb\u53d6 n \u4e2a\u5b57\u8282\uff0c\u9664\u975e EOF\uff1f\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u6b63\u5728\u4f7f\u7528\u4e00\u4e2a\u8fd4\u56de <code>io.reader<\/code> \u7684\u51fd\u6570\u4ece internet \u4e0b\u8f7d\u6587\u4ef6\u3002<\/p>\n<p>\u6211\u60f3\u4ee5 2048 \u4e2a\u5757\u7684\u5f62\u5f0f\u5904\u7406\u8be5\u6587\u4ef6\uff0c\u76f4\u5230\u7531\u4e8e eof \u800c\u4e0d\u518d\u53ef\u80fd\u3002<\/p>\n<p><code>io.readfull<\/code> \u51fd\u6570\u51e0\u4e4e\u5c31\u662f\u6211\u60f3\u8981\u7684\uff1a<\/p>\n<pre>buf := make([]byte, 2048)\n\nfor {\n    if _, err := io.ReadFull(reader, buf); err == io.EOF {\n        return io.ErrUnexpectedEOF\n    } else if err != nil {\n        return err\n    }\n\n    \/\/ Do processing on buf\n}<\/pre>\n<p>\u95ee\u9898\u662f\u5e76\u975e\u6240\u6709\u6587\u4ef6\u90fd\u662f 2048 \u5b57\u8282\u7684\u500d\u6570\uff0c\u56e0\u6b64\u6700\u540e\u4e00\u4e2a\u5757\u53ef\u80fd\u53ea\u662f\u4f8b\u5982500 \u5b57\u8282\uff0c<code>io.readfull<\/code> \u56e0\u6b64\u5c06\u8fd4\u56de <code>errunexpectedeof<\/code> \u5e76\u4e14\u6700\u540e\u4e00\u4e2a\u5757\u88ab\u4e22\u5f03\u3002<\/p>\n<p>\u603b\u7ed3\u6211\u60f3\u8981\u7684\u5185\u5bb9\u7684\u51fd\u6570\u540d\u79f0\u53ef\u80fd\u662f<strong>io.readfullunlesslastchunk<\/strong>\uff0c\u56e0\u6b64\u5982\u679c<code>buf<\/code>\u65e0\u6cd5\u586b\u51452048\u5b57\u8282\u7684\u539f\u56e0\u662f\u6587\u4ef6\u5728\u4f8b\u5982\u4e4b\u540e\u662feof\uff0c\u5219\u4e0d\u4f1a\u8fd4\u56de<code>errunexpectedeof<\/code>\u3002 500 \u5b57\u8282\u3002\u4f46\u662f\uff0c\u5728\u4efb\u4f55\u5176\u4ed6\u60c5\u51b5\u4e0b\uff0c\u90fd\u5e94\u8fd4\u56de <code>errunexpectedeof<\/code>\uff0c\u56e0\u4e3a\u51fa\u73b0\u4e86\u95ee\u9898\u3002<\/p>\n<p>\u6211\u53ef\u4ee5\u505a\u4ec0\u4e48\u6765\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u6807\uff1f<\/p>\n<p>\u53e6\u4e00\u4e2a\u95ee\u9898\u662f\uff0c\u5f53\u65f6\u76f4\u63a5\u4ece\u7f51\u7edc\u8bfb\u53d6 2048 \u5b57\u8282\u4f3c\u4e4e\u6709\u5f88\u5927\u7684\u5f00\u9500\uff0c\u5982\u679c\u6211\u53ef\u4ee5\u4ece\u7f51\u7edc\u83b7\u53d6 256 kb \u5230\u7f13\u51b2\u533a\uff0c\u7136\u540e\u4ece\u8be5\u7f13\u51b2\u533a\u83b7\u53d6\u6211\u9700\u8981\u7684 2048 \u5b57\u8282\uff0c\u90a3\u4e48\u4f1a\u66f4\u597d\u3002<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u4f8b\u5982\uff0c<\/p>\n<pre>package main\n\nimport (\n    \"bufio\"\n    \"fmt\"\n    \"io\"\n    \"os\"\n)\n\nfunc readChunks(r io.Reader) error {\n    if _, ok := r.(*bufio.Reader); !ok {\n        r = bufio.NewReader(r)\n    }\n    buf := make([]byte, 0, 2048)\n    for {\n        n, err := io.ReadFull(r, buf[:cap(buf)])\n        buf = buf[:n]\n        if err != nil {\n            if err == io.EOF {\n                break\n            }\n            if err != io.ErrUnexpectedEOF {\n                return err\n            }\n        }\n\n        \/\/ Process buf\n        fmt.Println(len(buf))\n\n    }\n    return nil\n}\n\nfunc main() {\n    fName := `test.file`\n    f, err := os.Open(fName)\n    if err != nil {\n        fmt.Println(err)\n        return\n    }\n    defer f.Close()\n\n    err = readChunks(f)\n    if err != nil {\n        fmt.Println(err)\n        return\n    }\n}<\/pre>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300a\u7cbe\u786e\u8bfb\u53d6 n \u4e2a\u5b57\u8282\uff0c\u9664\u975e EOF\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\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-208036","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208036","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=208036"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208036\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}