{"id":3564,"date":"2016-02-29T11:39:40","date_gmt":"2016-02-29T03:39:40","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=3564"},"modified":"2016-02-29T14:31:19","modified_gmt":"2016-02-29T06:31:19","slug":"qjson-%e5%b8%b8%e8%a7%81%e9%97%ae%e9%a2%98%e5%8f%8a%e8%a7%a3%e7%ad%94","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=3564","title":{"rendered":"[QJSON] \u5e38\u89c1\u95ee\u9898\u53ca\u89e3\u7b54"},"content":{"rendered":"

1\u3001\u5982\u4f55\u521b\u5efa\u6839\u7ed3\u70b9\u4e3a\u6570\u7ec4\u7c7b\u578b\u7684JSON\u5bf9\u8c61\uff1f<\/h4>\n

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2\u3001\u5982\u4f55\u904d\u5386 JSON \u5b50\u7ed3\u70b9\u7684\u4fe1\u606f\uff1f<\/h4>\n

QJson \u7684 Count \u5c5e\u6027\u8bb0\u5f55\u4e86\u6570\u7ec4\u6216\u5bf9\u8c61\u7684\u5b50\u7ed3\u70b9\u6570\u91cf\uff0c\u7136\u540e\u60a8\u53ef\u4ee5\u4f7f\u7528\u6b63\u5e38\u7684\u5faa\u73af\u6765\u904d\u5386\u5b50\u5143\u7d20\uff0c\u5982\uff1a<\/p>\n

var\r\n  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 \u73b0\u5728\u6307\u5411\u4e86\u7b2c I \u4e2a\u7ed3\u70b9\uff0c\u7136\u540e\u76f4\u63a5\u8bbf\u95ee\u5176\u5c5e\u6027\r\n   end;\r\n...\r\nend;<\/pre>\n
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for AItem in AJson do\r\n   begin\r\n   \/\/AItem....\r\n   end;\r\n<\/pre>\n
3\u3001TQJson \u7684\u5b50\u7ed3\u70b9\u662f\u5426\u9700\u8981\u5355\u72ec\u91ca\u653e\uff1f<\/h4>\n
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var\r\n  AJson,AChild:TQJson;\r\nbegin\r\nAJson:=TQJson.Create;\r\ntry\r\n   AJson.Parse('{\"a\":1}\");\r\n   AChild:=AJson.ItemByName('a');\r\nfinally\r\n   FreeAndNil(AJson);\r\n   FreeAndNil(AChild);\/\/\u591a\u4f59\r\nend;<\/pre>\n
4\u3001\u4e3a\u5565 FromRtti \u65f6\uff0c\u6709\u4e9b\u7c7b\u578b\u6ca1\u6709 RTTI \u4fe1\u606f\uff1f<\/h4>\n
\u53c2\u7167\u8fd9\u7bc7\u6587\u7ae0 \uff1ahttps:\/\/blog.qdac.cc\/?p=1305<\/a><\/p>\n
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XXXByPath \u6216 XXXByName \u51fd\u6570\u652f\u6301\u6309\u6570\u7ec4\u65b9\u5f0f\u8bbf\u95ee\u67d0\u4e00\u5b50\u5143\u7d20\uff0c\u5982\u4e0b\u9762\u7684\u5199\u6cd5\u662f\u6b63\u786e\u7684\uff1a<\/p>\n
AJson.ItemByName('[0].name');<\/pre>\n
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{\r\n\"jone\":{\r\n  \"name\":\"jone grey\"\r\n  }\r\n}<\/pre>\n
\u5982\u679c\u6211\u4eec\u6309 ValueByPath(‘[0].name”,””) \u53ef\u4ee5\u5f97\u5230\u503c “jone grey”\u3002\u540c\u6837\u7684\uff0c\u6211\u4eec\u901a\u8fc7 ValueByPath(‘jone.name’,”) \u4e5f\u53ef\u4ee5\u5f97\u5230 “jone grey” \u8fd9\u4e2a\u503c\u3002<\/p>\n
6\u3001QJson \u7ed3\u70b9\u600e\u4e48\u8d4b\u503c\uff1f<\/h4>\n
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    \n
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  • ResetNull\uff1a\u6307\u5b9a\u7684\u7ed3\u70b9\u7684\u503c\u91cd\u7f6e\u4e3aNULL\u3002<\/li>\n
  • Value\uff1a\u8fd9\u4e2a\u4f1a\u5c1d\u8bd5\u6309\u5f53\u524d\u8bbe\u5b9a\u7684\u7c7b\u578b\u5c06\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u76f8\u5e94\u7684\u503c\u3002\u5982\u679c\u5f53\u524d\u7ed3\u70b9\u7c7b\u578b\u672a\u77e5\uff0c\u5219\u4f1a\u5c1d\u8bd5\u68c0\u6d4b\u5185\u5bb9\u7684\u7c7b\u578b\u6765\u8d4b\u503c\u3002<\/li>\n
  • AsJson\uff1a\u8d4b\u503c\u4e00\u4e2aJson\u5b57\u7b26\u4e32\u3002QJson \u5c06\u76f4\u63a5\u5c1d\u8bd5\u89e3\u6790\u8fd9\u4e2a Json \u5b57\u7b26\u4e32\uff0c\u5982\u679c\u65e0\u6cd5\u89e3\u6790\uff0c\u5219\u5f53\u505a\u666e\u901a\u7684\u5b57\u7b26\u4e32\u503c\u6765\u5904\u7406\uff0c\u6b64\u65f6\u7b49\u4ef7\u4e8e AsString\u3002<\/li>\n
  • AsVariant\uff1a\u5c06\u4e00\u4e2a Variant \u7684\u503c\u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684 Json \u7ed3\u70b9\u3002Json \u7ed3\u70b9\u7684\u503c\u7c7b\u578b\u4f1a\u6839\u636e Variant \u7684\u6570\u636e\u7c7b\u578b\u800c\u81ea\u52a8\u53d8\u66f4\u3002<\/li>\n<\/ul>\n
    \u60a8\u53ef\u4ee5\u6839\u636e\u9700\u8981\uff0c\u9009\u62e9\u4e0a\u9762\u7684\u4efb\u610f\u65b9\u6cd5\u6765\u8d4b\u503c\u3002<\/p>\n
    7\u3001QJson \u7ed3\u70b9\u5982\u4f55\u5b58\u53d6\u4e8c\u8fdb\u5236\u6570\u636e\uff1f<\/h4>\n
    \u6709\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n
      \n
    • ValueFromStream\/StreamFromValue \u53ef\u4ee5\u76f4\u63a5\u4ece\u6d41\u4e2d\u8d4b\u503c\u6216\u5c06\u503c\u4fdd\u5b58\u5230\u6d41\u4e2d\uff1b<\/li>\n
    • ValueFromFile\/FileFromValue \u53ef\u4ee5\u76f4\u63a5\u4ece\u6587\u4ef6\u4e2d\u8d4b\u503c\u6216\u5c06\u503c\u4fdd\u5b58\u5230\u6587\u4ef6\u4e2d\uff1b<\/li>\n
    • \u4f7f\u7528 AsBytes \u5c5e\u6027\u76f4\u63a5\u64cd\u4f5c\u4e8c\u8fdb\u5236\u6570\u636e\uff1b<\/li>\n<\/ul>\n
      \u6ce8\u610f\uff0c\u4e8c\u8fdb\u5236\u6570\u636e\u7f16\u7801\u9ed8\u8ba4\u662f\u76f4\u63a5\u8f6c\u6362\u6210\u5341\u516d\u8fdb\u5236\u5b58\u8d2e\uff0c\u5982\u679c\u4f60\u60f3\u4f7f\u7528Base64\uff0c\u8bf7\u8c03\u7528\u00a0EncodeJsonBinaryAsBase64 \u51fd\u6570\u8c03\u6574\u5168\u5c40\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u7f16\u7801\u65b9\u5f0f\uff0c\u5b83\u5c06\u5f71\u54cd\u5176\u540e\u6240\u6709\u4e0a\u8ff0\u4e09\u79cd\u65b9\u5f0f\u7684\u6570\u636e\u89e3\u6790\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      1\u3001\u5982\u4f55\u521b\u5efa\u6839\u7ed3\u70b9\u4e3a\u6570\u7ec4\u7c7b\u578b\u7684JSON\u5bf9 […]<\/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-3564","post","type-post","status-publish","format-standard","hentry","category-c-builder","category-delphi","category-qdac","category-qjson"],"views":6164,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/3564","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=3564"}],"version-history":[{"count":6,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/3564\/revisions"}],"predecessor-version":[{"id":3567,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/3564\/revisions\/3567"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}