{"id":205954,"date":"2025-06-12T10:09:24","date_gmt":"2025-06-12T02:09:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205954\/"},"modified":"2025-06-12T10:09:24","modified_gmt":"2025-06-12T02:09:24","slug":"colly-%e4%b8%ad%e5%87%ba%e7%8e%b0-collyinvalid-memory-address-or-nil-pointer-dereference-%e9%94%99%e8%af%af%e7%9a%84%e5%8e%9f%e5%9b%a0%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205954\/","title":{"rendered":"Colly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aColly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~,<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241029\/173017821567206ca750805.jpg\" class=\"aligncenter\">,<br \/>\n<strong>colly \u4e2d\u51fa\u73b0\u7684 \u201ccolly:invalid memory address or nil pointer dereference\u201d<\/strong>,\u5728\u4f7f\u7528 colly \u65f6\uff0c\u51fa\u73b0\u4e86 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u4fe1\u606f\uff0c\u8fd9\u901a\u5e38\u6307\u793a\u5b58\u5728\u7a7a\u6307\u9488\u5f15\u7528\u3002\u6839\u636e\u63d0\u4f9b\u7684\u4ee3\u7801\uff0c\u9519\u8bef\u53ef\u80fd\u6e90\u81ea\u4ee5\u4e0b\u4f4d\u7f6e\uff1a,<br \/>\n<strong>\u9519\u8bef\u5206\u6790<\/strong>,\u5728 downloadimages \u51fd\u6570\u4e2d\uff0cdesturl \u53ef\u80fd\u662f\u4e00\u4e2a\u672a\u521d\u59cb\u5316\u7684\u53d8\u91cf\uff0c\u5bfc\u81f4\u5728\u6784\u5efa srcref \u65f6\u51fa\u73b0\u7a7a\u6307\u9488\u5f15\u7528\u3002\u9519\u8bef\u6d88\u606f\u4e2d\u63d0\u5230\u7684 \u201cc:\/users\/dell\/desktop\/work\/golang\/colly\/colly.go:55\u201d \u8868\u793a\u9519\u8bef\u53d1\u751f\u5728\u4e0a\u8ff0\u4ee3\u7801\u7684\u7b2c 55 \u884c\uff0c\u5373 main \u51fd\u6570\u7684 c.visit() \u8c03\u7528\u4e2d\u3002,<br \/>\n<strong>\u4fee\u590d\u65b9\u6848<\/strong>,\u8981\u89e3\u51b3\u6b64\u9519\u8bef\uff0c\u8bf7\u786e\u4fdd\u5728\u4f7f\u7528 desturl \u4e4b\u524d\u5bf9\u5176\u8fdb\u884c\u521d\u59cb\u5316\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728 main \u51fd\u6570\u4e2d\u58f0\u660e\u5e76\u521d\u59cb\u5316 desturl\uff1a,\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aColly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\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\u6ce8GOLANG\u516c\u4f17\u53f7\u5427\uff01,colly \u4e2d\u51fa\u73b0\u7684 \u201ccolly:invalid memory address or nil pointer dereference\u201d,\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aColly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a<br \/>\n<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~,<br \/>\n<b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span>  <span>&gt;<\/span> <span>Colly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f<\/span><\/p>\n<h1>Colly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f<\/h1>\n<p><span>2024-10-29 13:03:50<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aColly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">GOLANG<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241029\/173017821567206ca750805.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>colly \u4e2d\u51fa\u73b0\u7684 \u201ccolly:invalid memory address or nil pointer dereference\u201d<\/strong><\/p>\n<p>\u5728\u4f7f\u7528 colly \u65f6\uff0c\u51fa\u73b0\u4e86 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u4fe1\u606f\uff0c\u8fd9\u901a\u5e38\u6307\u793a\u5b58\u5728\u7a7a\u6307\u9488\u5f15\u7528\u3002\u6839\u636e\u63d0\u4f9b\u7684\u4ee3\u7801\uff0c\u9519\u8bef\u53ef\u80fd\u6e90\u81ea\u4ee5\u4e0b\u4f4d\u7f6e\uff1a<\/p>\n<pre>package main\n\nimport (\n    \"fmt\"\n    \"io\"\n    \"net\/http\"\n    \"os\"\n    \"strings\"\n\n    \"github.com\/gocolly\/colly\"\n)\n\nfunc main() {\n    \/\/ \u8bbe\u7f6e colly \u5b9e\u4f8b\n    c := colly.newcollector()\n\n    \/\/ \u5728\u9047\u5230\u56fe\u7247\u65f6\u4e0b\u8f7d\n    c.onhtml(\"img[src]\", downloadimages)\n\n    \/\/ \u8bbf\u95ee\u76ee\u6807\u9875\u9762\n    c.visit(\"https:\/\/example.com\")\n}\n\nfunc downloadimages(e *colly.htmlelement) {\n    srcref := desturl + e.attr(\"src\")\n    res, _ := http.get(srcref)\n    if strings.contains(srcref, \"http\") &amp;&amp; strings.contains(srcref, \".jpg\") {\n        arr := strings.split(srcref, \"\/\")\n        filename := strings.split(arr[len(arr)-1], \".\")[0]\n        fmt.println(\"filename\", filename)\n        f, _ := os.create(\".\/images\/\" + filename + \".jpg\")\n        defer f.close()\n        written, _ := io.copy(f, res.body)\n\n        fmt.println(\"info\", written)\n    }\n}<\/pre>\n<p><strong>\u9519\u8bef\u5206\u6790<\/strong><\/p>\n<p>\u5728 downloadimages \u51fd\u6570\u4e2d\uff0cdesturl \u53ef\u80fd\u662f\u4e00\u4e2a\u672a\u521d\u59cb\u5316\u7684\u53d8\u91cf\uff0c\u5bfc\u81f4\u5728\u6784\u5efa srcref \u65f6\u51fa\u73b0\u7a7a\u6307\u9488\u5f15\u7528\u3002\u9519\u8bef\u6d88\u606f\u4e2d\u63d0\u5230\u7684 \u201cc:\/users\/dell\/desktop\/work\/golang\/colly\/colly.go:55\u201d \u8868\u793a\u9519\u8bef\u53d1\u751f\u5728\u4e0a\u8ff0\u4ee3\u7801\u7684\u7b2c 55 \u884c\uff0c\u5373 main \u51fd\u6570\u7684 c.visit() \u8c03\u7528\u4e2d\u3002<\/p>\n<p><strong>\u4fee\u590d\u65b9\u6848<\/strong><\/p>\n<p>\u8981\u89e3\u51b3\u6b64\u9519\u8bef\uff0c\u8bf7\u786e\u4fdd\u5728\u4f7f\u7528 desturl \u4e4b\u524d\u5bf9\u5176\u8fdb\u884c\u521d\u59cb\u5316\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728 main \u51fd\u6570\u4e2d\u58f0\u660e\u5e76\u521d\u59cb\u5316 desturl\uff1a<\/p>\n<pre>var destUrl = \"https:\/\/example.com\/images\/\"<\/pre>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aColly \u4e2d\u51fa\u73b0 \u201ccolly:invalid memory address or nil pointer dereference\u201d \u9519\u8bef\u7684\u539f\u56e0\u662f\u4ec0\u4e48\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\u6ce8GOLANG\u516c\u4f17\u53f7\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   \u5982\u4f55\u5b9e\u73b0\u56fe\u7247\u61d2\u52a0\u8f7d\uff0c\u907f\u514d\u9875\u9762 DOM \u904d\u5386\u7684\u4f4e\u6548\u65b9\u5f0f\uff1f\n <\/dd>\n<\/dl>\n<dl>\n<dt>\n <\/dt>\n<dd>\n   Spring Boot \u7b80\u4ecb\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587 \u300a&#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-205954","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205954","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=205954"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205954\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205954"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}