{"id":1119,"date":"2014-11-03T14:34:37","date_gmt":"2014-11-03T06:34:37","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=1119"},"modified":"2014-11-03T14:34:37","modified_gmt":"2014-11-03T06:34:37","slug":"xe7%e4%b8%ad%e4%bd%bf%e7%94%a8%e9%bb%98%e8%ae%a4%e7%9a%84base64%e7%bc%96%e7%a0%81%e7%9a%84%e4%b8%80%e4%b8%aa%e5%b0%8f%e6%8f%90%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=1119","title":{"rendered":"XE7\u4e2d\u4f7f\u7528\u9ed8\u8ba4\u7684Base64\u7f16\u7801\u7684\u4e00\u4e2a\u5c0f\u63d0\u793a"},"content":{"rendered":"

XE7\u4e2d\u7684Base64\u7f16\u7801\u5355\u5143\u88ab\u653e\u5230\u4e86System.NetEncoding\u91cc\uff0c\u4f46\u5b83\u7684\u9ed8\u8ba4\u5b9e\u73b0\u65f6\uff0c\u4f1a\u6bcf76\u4e2a\u5b57\u7b26\u52a0\u4e00\u4e2a\u6362\u884c\uff0c\u5148\u770bTNetEncoding\u7684Base64\u5c5e\u6027\u7684\u8bfb\u53d6\u51fd\u6570\u5b9e\u73b0\uff1a<\/p>\n

class function TNetEncoding.GetBase64Encoding: TNetEncoding;\r\nvar\r\n  LEncoding: TBase64Encoding;\r\nbegin\r\n  if FBase64Encoding = nil then\r\n  begin\r\n    LEncoding := TBase64Encoding.Create;\r\n    if AtomicCmpExchange(Pointer(FBase64Encoding), Pointer(LEncoding), nil) <> nil then\r\n      LEncoding.Free;\r\n{$IFDEF AUTOREFCOUNT}\r\n    FBase64Encoding.__ObjAddRef;\r\n{$ENDIF AUTOREFCOUNT}\r\n  end;\r\n  Result := FBase64Encoding;\r\nend;<\/pre>\n
OK\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5b83\u5b83\u521b\u5efa\u4e86\u4e00\u4e2aTBase64Encoding\u7684\u9ed8\u8ba4\u5b9e\u4f8b\uff0c\u4f7f\u7528\u7684\u662f\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u3002\u800c\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u6211\u4eec\u770b\u4e0b\uff1a<\/p>\n
constructor TBase64Encoding.Create;\r\nbegin\r\n  Create(kCharsPerLine, sLineBreak);\r\nend;\r\n\r\nconstructor TBase64Encoding.Create(CharsPerLine: Integer);\r\nbegin\r\n  Create(CharsPerLine, sLineBreak);\r\nend;\r\n\r\nconstructor TBase64Encoding.Create(CharsPerLine: Integer; LineSeparator: string);\r\nbegin\r\n  FCharsPerline := CharsPerLine;\r\n  FLineSeparator := LineSeparator;\r\nend;<\/pre>\n
\u6211\u4eec\u770b\u5230\u4e86\u4e00\u4e2akCharsPerLine\u548csLineBreak\u4e24\u4e2a\u53c2\u6570\u3002\u518d\u8fdb\u4e00\u6b65\u5230\u5185\u90e8\u7f16\u7801\u5355\u5143\uff08580\u884c\uff09\u6709\u4e0b\u9762\u4e00\u6bb5\u4ee3\u7801\uff1a<\/p>\n
if (FCharsPerLine > 0) and (State.StepCount >= FCharsPerLine\/4)  then\r\n        begin\r\n          Move(LineSeparator[0], POut^, Length(LineSeparator));\r\n          Inc(POut, Length(LineSeparator));\r\n          State.StepCount := 0;\r\n        end;<\/pre>\n
\u00a0\u6211\u4eec\u770b\u5230\u5b83\u4f1a\u81ea\u52a8\u6dfb\u52a0\u4e86\u6362\u884c\u7b26\u3002\u6211\u4eec\u770b\u4e0bkCharsPerLine\u7684\u5b9a\u4e49\uff1a<\/strong><\/p>\n
const\r\n    kCharsPerLine = 76;<\/pre>\n
\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u4e0d\u8981\u7f16\u7801\u7ed3\u679c\u4e2d\u5b58\u5728\u6362\u884c\u7b26\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u4e0d\u5e94\u8be5\u4f7f\u7528\u9ed8\u8ba4\u7684TNetEncoding.Base64\u5b9e\u4f8b\u6765\u8fdb\u884cBase64\u7f16\u7801\uff0c\u800c\u662f\u8981\u81ea\u5df1\u521b\u5efa\u4e00\u4e2aTBase64Encoding\u5b9e\u4f8b\u6765\u5b9e\u73b0\uff0c\u53c2\u8003\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
procedure TForm1.Button1Click(Sender: TObject);\r\nvar\r\n  AEncoding:TBase64Encoding;\r\n  ...\r\nbegin\r\n  AEncoding:=TBase64Encoding.Create(MaxInt);\r\n  Edit2.Text := AEncoding.EncodeBytesToString(...);\r\n  FreeAndNil(AEncoding);\r\nend;\r\n<\/pre>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
XE7\u4e2d\u7684Base64\u7f16\u7801\u5355\u5143\u88ab\u653e\u5230\u4e86S […]<\/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":[69,8,21],"tags":[152,153],"class_list":["post-1119","post","type-post","status-publish","format-standard","hentry","category-c-builder","category-delphi","category-misc","tag-base64","tag-153"],"views":6658,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1119","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=1119"}],"version-history":[{"count":1,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1119\/revisions"}],"predecessor-version":[{"id":1120,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1119\/revisions\/1120"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}