{"id":1330,"date":"2014-11-25T20:47:30","date_gmt":"2014-11-25T12:47:30","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=1330"},"modified":"2015-01-04T19:31:27","modified_gmt":"2015-01-04T11:31:27","slug":"%e7%a4%ba%e4%be%8b-qjson%e4%b8%ad%e7%bb%93%e7%82%b9%e7%9a%84%e9%81%8d%e5%8e%86%e4%b8%8e%e6%9f%a5%e6%89%be","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=1330","title":{"rendered":"\u793a\u4f8b-QJson\u4e2d\u7ed3\u70b9\u7684\u67e5\u627e\u4e0e\u904d\u5386\u65b9\u6cd5\u5c0f\u7ed3"},"content":{"rendered":"<p>1\u3001\u67e5\u627e\u7ed3\u70b9<\/p>\n<p>QJson\u63d0\u4f9b\u4e86\u4e00\u7ec4\u51fd\u6570\u6765\u67e5\u627e\u67d0\u4e00\u4e2a\u7ed3\u70b9\uff0c\u6211\u4eec\u5728\u4e0b\u9762\u6765\u5206\u522b\u770b\u4e00\u4e0b\uff1a<\/p>\n<pre class=\"lang:delphi decode:true\">function ItemByName(AName: QStringW): TQJson; overload;\r\nfunction ItemByName(const AName: QStringW; AList: TQJsonItemList;ANest: Boolean = False): Integer; overload;\r\nfunction ItemByRegex(const ARegex: QStringW; AList: TQJsonItemList;ANest: Boolean = False): Integer; overload;\r\nfunction ItemByPath(APath: QStringW): TQJson;\r\nfunction IndexOf(const AName: QStringW): Integer;\r\nfunction FindIf(const ATag: Pointer; ANest: Boolean;AFilter: TQJsonFilterEventA): TQJson;\r\nfunction FindIf(const ATag: Pointer; ANest: Boolean;AFilter: TQJsonFilterEvent): TQJson; overload;<\/pre>\n<p>\uff081\uff09\u6b64\u51fd\u6570\u7528\u4e8e\u5728\u5f53\u524d\u7ed3\u70b9\u4e0b\u67e5\u627e\u6307\u5b9a\u540d\u79f0\u7684\u5b50\u7ed3\u70b9\uff0c\u5982\u679c\u6307\u4e0d\u5230\uff0c\u8fd4\u56deNIL\/NULL\u3002\u5982\u679c\u8981\u786e\u4fdd\u7ed3\u70b9\u5b58\u5728\uff0c\u7528ForcePath\u6765\u4ee3\u66ff\u6b64\u51fd\u6570\u3002<\/p>\n<pre class=\"lang:delphi decode:true \">AItem:=AJson.ItemByName('MySubNode');\r\nif Assigned(AItem) then\r\n   ...\r\nelse\r\n   ...<\/pre>\n<p>\uff082\uff09\u6b64\u51fd\u6570\u7528\u4e8e\u5728\u5f53\u524d\u7ed3\u70b9\u4e0b\u67e5\u627e\u6307\u5b9a\u540d\u79f0\u7684\u5b50\u7ed3\u70b9\uff0c\u5e76\u5c06\u627e\u5230\u7684\u7ed3\u70b9\u653e\u5230AList\u8fd9\u4e2a\u5217\u8868\u4e2d\u3002ANest\u53c2\u6570\u6307\u5b9a\u4e86\u662f\u5426\u9012\u5f52\u67e5\u627e\u5b50\u7ed3\u70b9\u3002\u8fd4\u56de\u7684\u662f\u627e\u5230\u7684\u7ed3\u70b9\u603b\u6570\u3002<\/p>\n<pre class=\"lang:delphi decode:true\">var\r\n  AList:TQJsonItemList;\r\n  AJson:TQJson;\r\n  I:Integer;\r\nbegin\r\nAList:=TQJsonItemList.Create;\r\nAJson:=TQJson.Create;\r\n...\r\nif AJson.ItemByName('Name',AList,True) then\r\n   begin\r\n   for I:=0 to AList.Count-1 do\r\n      ...\r\n   end;\r\n...\r\nFreeAndNil(AList);\r\nFreeAndNil(AJson);\r\nend;<\/pre>\n<p>\uff083\uff09\u6b64\u51fd\u6570\u7528\u4e8e\u6309\u6b63\u5219\u8868\u8fbe\u5f0f\u67e5\u627e\u7b26\u5408\u8981\u6c42\u7684\u5b50\u7ed3\u70b9\uff0c\u5e76\u5c06\u627e\u5230\u7684\u7ed3\u70b9\u653e\u5230AList\u4e2d\u8fd9\u4e2a\u5217\u8868\u4e2d\u3002ANest\u53c2\u6570\u6307\u5b9a\u4e86\u662f\u5426\u9012\u5f52\u67e5\u627e\u5b50\u7ed3\u70b9\u3002\u8fd4\u56de\u7684\u662f\u627e\u5230\u7684\u7ed3\u70b9\u603b\u6570\u3002<\/p>\n<p>\u5982\u67e5\u627e\u6240\u6709\u4ee5_+\u6570\u5b57\u547d\u540d\u7684\u7ed3\u70b9\uff08\u7c7b\u4f3c\u4e8e_0001,_0002\u8fd9\u79cd\u5f62\u5f0f\u7684\u7ed3\u70b9\uff09\uff1a<\/p>\n<pre class=\"lang:delphi decode:true \">var\r\n  AList:TQJsonItemList;\r\n  AJson:TQJson;\r\n  I:Integer;\r\nbegin\r\nAList:=TQJsonItemList.Create;\r\nAJson:=TQJson.Create;\r\n...\r\nif AJson.ItemByRegex('_\\d+',AList,True) then\r\n   begin\r\n   for I:=0 to AList.Count-1 do\r\n      ...\r\n   end;\r\n...\r\nFreeAndNil(AList);\r\nFreeAndNil(AJson);\r\nend;<\/pre>\n<p>\uff084\uff09\u6b64\u51fd\u6570\u6309\u7167\u8def\u5f84\u67e5\u627e\u6307\u5b9a\u540d\u79f0\u7684\u5b50\u7ed3\u70b9\uff0c\u7531\u4e8e \u201c.\u201d \u3001 \u201c\/\u201d \u3001 \u201c\\\u201d \u88ab\u5f53\u505a\u8def\u5f84\u5206\u9694\u7b26\uff0c\u800c \u201c[]\u201d \u88ab\u5f53\u505a\u6570\u7ec4\u5206\u9694\u7b26\uff0c\u56e0\u6b64\uff0c\u4e0d\u80fd\u5728\u7ed3\u70b9\u540d\u79f0\u4e2d\u5305\u542b\u4e0a\u8ff0\u5b57\u7b26\u3002\u5982\u679c\u6307\u5b9a\u7684\u8def\u5f84\u4e0d\u5b58\u5728\uff0c\u8fd4\u56deNIL\/NULL\u3002\u5728\u8def\u5f84\u4e2d\uff0c\u6570\u7ec4\u5206\u9694\u7b26\u9002\u7528\u4e8e\u5bf9\u8c61\u548c\u6570\u7ec4\u7c7b\u578b\u7684\u7ed3\u70b9\uff0c\u5982\u679c\u662f\u591a\u5c42\u7ed3\u6784\uff0c\u4f1a\u88ab\u5f53\u505a\u591a\u7ef4\u6570\u7ec4\u6765\u5904\u7406\u3002\u5982\u201ca[1][2]\u201d\uff0c\u8868\u793a\u53d6\u7ed3\u70b9\u540d\u4e3aa\u4e0b\u7684\u7b2c2\u4e2a\u5b50\u7ed3\u70b9\u7684\u7b2c3\u4e2a\u5b50\u7ed3\u70b9\u3002<\/p>\n<pre class=\"lang:delphi decode:true \">AItem:=AJson.ItemByPath('a.b.c[0].d');\r\nif Assigned(AItem) then\r\n  ...\r\nelse\r\n  ...<\/pre>\n<p>\uff085\uff09IndexOf\u51fd\u6570\u548cItemByName\u7c7b\u4f3c\uff0c\u4e0d\u540c\u7684\u662fIndexOf\u8fd4\u56de\u5bf9\u5e94\u7ed3\u70b9\u7684\u7d22\u5f15\uff0c\u5982\u679c\u672a\u627e\u5230\u8fd4\u56de-1\u3002<\/p>\n<pre class=\"lang:delphi decode:true \">I:=AJson.IndexOf('Name');\r\nif I&lt;&gt;-1 then\r\n  begin\r\n  AItem:=AJson[I];\r\n  ...\r\n  end;\r\n...<\/pre>\n<p>\uff086\uff09\u548c\uff087\uff09\u90fd\u662f\u7531\u7528\u6237\u63d0\u4f9b\u7279\u5b9a\u7684\u8fc7\u6ee4\u89c4\u5219\u6765\u67e5\u627e\u6307\u5b9a\u7684\u7ed3\u70b9\uff0c\u4e0d\u540c\u7684\u662f\uff086\uff09\u4e3a\u533f\u540d\u51fd\u6570\u7248\u672c\uff0c\u800c\uff087\uff09\u662f\u666e\u901a\u7c7b\u6210\u5458\u51fd\u6570\u7248\u672c\uff0c\u4e0b\u9762\u7684\u4f8b\u5b50\u6f14\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u533f\u540d\u51fd\u6570\u6765\u8fc7\u6ee4\u3002<\/p>\n<pre class=\"lang:delphi decode:true\">AItem:=AJson.FindIf(nil,true,procedure(ASender, AItem: TQJson;var Accept: Boolean; ATag: Pointer)\r\n  begin\r\n  if AItem.Name='Name' then\r\n    Accept:=True\r\n  else\r\n    ...\r\n  end);\r\nif Assigned(AItem) then  \r\n  ...<\/pre>\n<p>2\u3001\u904d\u5386\u7ed3\u70b9<\/p>\n<p>TQJson\u7684\u6bcf\u4e2a\u7ed3\u70b9\u7684Count\u5c5e\u6027\u8bb0\u5f55\u4e86\u603b\u7684\u7ed3\u70b9\u6570\uff0cItems\u5c5e\u6027\u7528\u4e8e\u8fd4\u56de\u6bcf\u4e2a\u5b50\u7ed3\u70b9\u3002\u5728\u7ed3\u70b9\u7c7b\u578b\u662fjdtArray\uff08\u6570\u7ec4\uff09\u6216jdtObject\uff08\u5bf9\u8c61\uff09\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u6700\u7b80\u5355\u7684\u5faa\u73af\u6765\u904d\u5386\u6bcf\u4e00\u4e2a\u5b50\u7ed3\u70b9\u3002<\/p>\n<pre class=\"lang:delphi decode:true\">var\r\n  AJson,AItem:TQJson;\r\n  I:Integer;\r\nbegin\r\n...\r\nfor I:=0 to AJson.Count-1 do\r\n  begin\r\n  AItem:=AJson[I];\r\n  ...\/\/AItem\u5c31\u662fAJson\u7684\u7b2cI\u4e2a\u6210\u5458\r\n  end;\r\n...\r\nend;<\/pre>\n<p>\u53e6\u5916\uff0cQJson \u63d0\u4f9b\u4e86 for..in \u8bed\u6cd5\u7684\u652f\u6301\uff0c\u6240\u4ee5\u66f4\u7b80\u5355\u7684\u8bed\u6cd5\u53ef\u4ee5\u662f\uff1a<\/p>\n<pre class=\"lang:delphi decode:true \">var\r\n  AJson,AItem:TQJson;\r\nbegin\r\n...\r\nfor AItem in AJson do\r\n  begin\r\n  ...\/\/\u7f16\u7801\u5bf9AItem\u8fdb\u884c\u5904\u7406\r\n  end;\r\n...\r\nend;<\/pre>\n<p>\u8981\u9012\u5f52\u904d\u5386\u6bcf\u4e00\u4e2a\u5b50\u7ed3\u70b9\uff0c\u53ef\u4ee5\u7528FindIf\u65b9\u6cd5\uff0c\u53ea\u4e0d\u8fc7Accept\u53c2\u6570\u6c38\u8fdc\u8fd4\u56deFalse\u5373\u53ef\uff08\u793a\u4f8b\u4e3a\u533f\u540d\u51fd\u6570\u7248\u672c\uff09\u3002\u5982\uff1a<\/p>\n<pre class=\"lang:delphi decode:true \">AJson.FindIf(nil,True,\r\nprocedure(ASender, AItem: TQJson;var Accept: Boolean; ATag: Pointer)\r\nbegin\r\n\/\/\u5bf9AItem\u8fdb\u884c\u5904\u7406\r\nend\r\n);<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u67e5\u627e\u7ed3\u70b9 QJson\u63d0\u4f9b\u4e86\u4e00\u7ec4\u51fd\u6570\u6765 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[69,8,9,7],"tags":[],"class_list":["post-1330","post","type-post","status-publish","format-standard","hentry","category-c-builder","category-delphi","category-qdac","category-qjson"],"views":7851,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1330","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1330"}],"version-history":[{"count":4,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1330\/revisions"}],"predecessor-version":[{"id":1679,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1330\/revisions\/1679"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}