{"id":1809,"date":"2015-01-23T19:28:26","date_gmt":"2015-01-23T11:28:26","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=1809"},"modified":"2015-01-23T19:28:26","modified_gmt":"2015-01-23T11:28:26","slug":"qworker-%e6%8a%80%e5%b7%a7-%e5%a4%9a%e6%ad%a5%e4%bd%9c%e4%b8%9a%e4%b8%ad%e5%8f%82%e6%95%b0%e9%87%8d%e5%a4%8d%e6%8a%95%e5%af%84","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=1809","title":{"rendered":"QWorker \u6280\u5de7 – \u591a\u6b65\u4f5c\u4e1a\u4e2d\u53c2\u6570\u91cd\u590d\u6295\u5bc4"},"content":{"rendered":"

QWorker \u00a0\u4e2d\u4f5c\u4e1a\u6295\u9012\u65f6\uff0c\u5982\u679c\u9700\u8981\u4f20\u9012\u4e00\u4e2a\u53c2\u6570\uff0c\u4f46\u6211\u4eec\u5982\u679c\u8bbe\u7f6ejdfFreeAsObject\uff0c\u90a3\u4e48\u663e\u7136\u5355\u6b21\u4f5c\u4e1a\u5b8c\u6210\u540e\uff0c\u76f8\u5173\u7684\u53c2\u6570\u5c31\u4f1a\u88ab\u91ca\u653e\uff0c\u65e0\u6cd5\u4f20\u9012\u5230\u4e0b\u4e00\u4e2a\u4f5c\u4e1a\u3002\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u8be5\u600e\u4e48\u505a\u5462\uff1f<\/p>\n

\u672c\u6587\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u529e\u6cd5\u6765\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff1a\u7528 QString \u5355\u5143\u4e3a\u60a8\u63d0\u4f9b\u7684 TQPtr \u505a\u667a\u80fd\u6307\u9488\u5c01\u88c5\uff0c\u7136\u540e\u4f5c\u4e1a\u65f6\u4f7f\u7528 jdfFreeAsInterface \u8ba9 QWorker \u91c7\u7528\u63a5\u53e3\u7684\u65b9\u5f0f\u6765\u7ba1\u7406\u9644\u52a0\u7684\u6570\u636e\u3002<\/p>\n

\u6211\u4eec\u5148\u770b\u4e00\u4e0b\u58f0\u660e\uff1a<\/p>\n

IQPtr = interface(IInterface)\r\n    function Get: Pointer;\r\n  end;\r\n  TQPtrFreeEvent=procedure (AData:Pointer) of object;\r\n  TQPtrFreeEventG=procedure (AData:Pointer);\r\n  {$IFDEF UNICODE}\r\n  TQPtrFreeEventA=reference to procedure (AData:Pointer);\r\n  {$ENDIF}\r\n  TQPtr = class(TInterfacedObject, IQPtr)\r\n  private\r\n    FObject: Pointer;\r\n    FOnFree:TQPtrFreeEvent;\r\n    {$IFDEF UNICODE}\r\n    FOnFreeA:TQPtrFreeEventA;\r\n    {$ENDIF}\r\n  public\r\n    constructor Create(AObject: Pointer); overload;\r\n    destructor Destroy; override;\r\n    class function Bind(AObject: TObject): IQPtr;overload;\r\n    class function Bind(AData:Pointer;AOnFree:TQPtrFreeEvent):IQPtr;overload;\r\n    class function Bind(AData:Pointer;AOnFree:TQPtrFreeEventG):IQPtr;overload;\r\n    {$IFDEF UNICODE}\r\n    class function Bind(AData:Pointer;AOnFree:TQPtrFreeEventA):IQPtr;overload;\r\n    {$ENDIF}\r\n    function Get: Pointer;\r\n  end;<\/pre>\n
\u6211\u4eec\u4f1a\u7528\u5230\u5176\u4e2d\u7684 TQPtr.Bind \u51fd\u6570\u548c IQPtr \u7684 Get \u63a5\u53e3\uff1a<\/p>\n
\uff081\uff09Bind \u51fd\u6570\u7528\u4e8e\u5c06\u5bf9\u8c61\u6216\u5176\u5b83\u7c7b\u578b\u7684\u6307\u9488\u901a\u8fc7\u63a5\u53e3\u7684\u65b9\u5f0f\u8fdb\u884c\u7ba1\u7406\uff0c\u5b83\u6709\u56db\u79cd\u91cd\u8f7d\uff0c\u5982\u679c\u662f\u5bf9\u8c61\uff0c\u4e0d\u9700\u8981\u6307\u5b9a\u91ca\u653e\u65b9\u6cd5\uff0c\u5982\u679c\u662f\u5176\u5b83\u7684\u5982\u8bb0\u5f55\u7c7b\u578b\uff0c\u5c31\u9700\u8981\u81ea\u5df1\u6307\u5b9a\u5185\u5b58\u91ca\u653e\u51fd\u6570\uff0c\u540e\u9762\u4e09\u4e2a\u5206\u522b\u5bf9\u5e94\u7c7b\u6210\u5458\u3001\u5168\u5c40\u51fd\u6570\u548c\u533f\u540d\u51fd\u6570\u7248\u672c\uff0c\u4e0d\u8fdb\u884c\u8d58\u8ff0\u3002<\/p>\n
\uff082\uff09Get \u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u5230\u54b1\u4eec\u7ba1\u7406\u7684\u539f\u59cb\u7684\u6307\u9488\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u63d0\u4f9b\u4e00\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50\u6765\u770b\u4e00\u4e0b\u5b83\u7684\u7528\u6cd5\uff1a<\/p>\n
unit Unit1;\r\n\r\ninterface\r\n\r\nuses\r\n  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,\r\n  Vcl.Controls, Vcl.Forms, Vcl.Dialogs,QString,QWorker, Vcl.StdCtrls;\r\n\r\ntype\r\n  TMyObject=class\r\n  public\r\n    Text:String;\r\n    destructor Destroy;override;\r\n  end;\r\n  TForm1 = class(TForm)\r\n    Button1: TButton;\r\n    procedure Button1Click(Sender: TObject);\r\n  private\r\n    { Private declarations }\r\n    procedure DoStep1(AJob:PQJob);\r\n    procedure DoStep2(AJob:PQJob);\r\n  public\r\n    { Public declarations }\r\n  end;\r\n\r\nvar\r\n  Form1: TForm1;\r\n\r\nimplementation\r\n\r\n{$R *.dfm}\r\n\r\nprocedure TForm1.Button1Click(Sender: TObject);\r\nbegin\r\nWorkers.Post(DoStep1,Pointer(TQPtr.Bind(TMyObject.Create)),False,jdfFreeAsInterface);\r\nend;\r\n\r\nprocedure TForm1.DoStep1(AJob: PQJob);\r\nvar\r\n  AObj:TMyObject;\r\nbegin\r\nAObj:=IQPtr(AJob.Data).Get;\r\nAObj.Text:='Hello,world from DoStep1';\r\nWorkers.Post(DoStep2,AJob.Data,True,jdfFreeAsInterface);\r\nend;\r\n\r\nprocedure TForm1.DoStep2(AJob: PQJob);\r\nvar\r\n  AObj:TMyObject;\r\nbegin\r\nAObj:=IQPtr(AJob.Data).Get;\r\nShowMessage(AObj.Text);\r\nend;\r\n\r\n{ TMyObject }\r\n\r\ndestructor TMyObject.Destroy;\r\nbegin\r\n  OutputDebugString('Object Free');\r\n  inherited;\r\nend;\r\n\r\nend.\r\n<\/pre>\n
\u4e0a\u9762\u7684\u8fd9\u6bb5\u4ee3\u7801\u6211\u4eec\u6295\u5bc4\u4e86\u4e00\u4e2a\u4e24\u6b65\u4f5c\u4e1a\uff0c\u7b2c\u4e00\u6b65\u4f5c\u4e1a\u8bbe\u7f6e\u4e86 TMyObject \u7684\u4e00\u4e2a\u5b9e\u4f8b\u7684 Text \u503c\uff0c\u800c\u7b2c\u4e8c\u6b65\u4f5c\u4e1a\u5219\u5c06\u5176\u7528 ShowMessage \u663e\u793a\u51fa\u6765\uff0c\u6211\u4eec\u6ca1\u6709\u81ea\u5df1\u91ca\u653e TMyObject \u5b9e\u4f8b\uff0c\u4f46\u6211\u4eec\u6267\u884c\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u7ed3\u679c\uff0c\u622a\u4e2a\u56fe\u770b\u4e0b\uff1a<\/p>\n
\"FreeAsInterface\"<\/a><\/p>\n
\"InfFree\"<\/a><\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u540e\u7eed\u6b65\u9aa4\u4e2d\uff0c\u53c2\u6570\u88ab\u5b89\u5168\u7684\u8bbf\u95ee\uff0c\u800cTMyObject\u5bf9\u8c61\u7684\u5b9e\u4f8b\u88ab\u81ea\u52a8\u91ca\u653e\u4e86\u3002<\/p>\n
\u97e6\u5c0f\u5b9d\u7684\u539f\u8bdd\uff1a\u5927\u529f\u544a\u6210\uff0c\u4eb2\u4e00\u4e2a~~~<\/p>\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
QWorker \u00a0\u4e2d\u4f5c\u4e1a\u6295\u9012\u65f6\uff0c\u5982\u679c\u9700\u8981 […]<\/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":[69,8,9,6],"tags":[299,57],"class_list":["post-1809","post","type-post","status-publish","format-standard","hentry","category-c-builder","category-delphi","category-qdac","category-qworker","tag-299","tag-57"],"views":5030,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1809","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=1809"}],"version-history":[{"count":1,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1809\/revisions"}],"predecessor-version":[{"id":1812,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1809\/revisions\/1812"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}