[Admin]

Автор: brochii
Описание: класс для асинхронного скачивания файлов
Ссылка: Asynchrone avec TIndyHttp & TThread

Код:

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unit AsyncDownloader;   interface   uses IdBaseComponent, IdComponent, IdTCPConnection,   IdTCPClient, IdHTTP,   {$IFDEF MSWINDOWS}   System.AnsiStrings,   {$ENDIF}   Classes, System.SysUtils;   type     {$IFDEF ANDROID}     AnsiString = String;     AnsiChar = Char;     PAnsiChar = PChar;   {$ENDIF}     TDownloadProgess = procedure(sender:TObject;percent:integer) of object;   TDownloadStringComplete = procedure(sender:TObject; AHtml : string) of object;   TDownloadDataComplete = procedure(sender:TObject; AStream : TStream) of object;   TDownloadFileComplete = procedure(sender:TObject; AFileName:string) of object;   TDownloadProcedure = procedure(AIdHttp:TIdHttp;ATarget:TStream) of object;     TDownloadState = (Initiate, Downloading, Done);   TDownloadType = (dltFile, dltData, dltString);     TAsyncDownloader = class(TThread)   private     FTagObject : TObject;     FTagString : String;     FTagInt : Integer;     FOwnStream:boolean;       FTarget : TStream;     FUrl, FFileName : String;       FPercent:byte;     FState : TDownloadState;       FDownloader : TIdHTTP;     FProgress : TDownloadProgess;       FStringComplete : TDownloadStringComplete;     FDataComplete : TDownloadDataComplete;     FFileComplete : TDownloadFileComplete;       FDownloadProcedure : TDownloadProcedure;       FType : TDownloadType;       procedure HttpWork(ASender: TObject; AWorkMode: TWorkMode; AWorkCount: Int64);     procedure DoProgress;     procedure DoCompleteFile;     procedure DoCompleteString;     procedure DoCompleteData;     procedure DoDownload;   public     constructor Create;overload;//(AUrl:string;ATarget:TStream);overload;     //constructor Create(AUrl:string;ATarget:TStream;ADownloadProcedure:TDownloadProcedure);overload;     constructor Create(ADownloadProcedure:TDownloadProcedure);overload;     destructor Free;     procedure Execute;override;       procedure DownloadData(AUrl:String);overload;     procedure DownloadData(AUrl:String;ATarget:TStream);overload;     procedure DownloadFile(AUrl, AFileName:String);overload;     procedure DownloadString(AUrl:String);overload;       procedure SetHeader;     ///<summary>Event that will be triggered at in interval time to provide     /// the percentage downloaded</summary>     ///<para> use this event to uptade something like a gauge or a progress component</para>     property OnProgress : TDownloadProgess read FProgress write FProgress;     ///<summary>This event is triggered when the download is complete</summary>     ///<para>Cast the Sender to TAsyncDownloader to retreave the properties needed</para>     ///<para>like the Url or the Target Stream used to store the download</para>     property OnDownloadStringComplete : TDownloadStringComplete read FStringComplete write FStringComplete;     property OnDownloadDataComplete : TDownloadDataComplete read FDataComplete write FDataComplete;     property OnDownloadFileComplete : TDownloadFileComplete read FFileComplete write FFileComplete;     ///<summary>This is the IdHttp object used to perform the download</summary>     property Downloader : TIdHTTP read FDownloader write FDownloader;     ///<summary>Target where the download will be stored</summary>     ///<para>This is a decendent of TStream</para>     property Url : string read FUrl write FUrl;     property State : TDownloadState read FState;       property TagObject : TObject read FTagObject write FTagObject;     property TagInt : Integer read FTagInt write FTagInt;     property TagString : String read FTagString write FTagString;   end;   implementation   (* constructor TAsyncDownloader.Create(AUrl:string;ATarget:TStream;ADownloadProcedure:TDownloadProcedure); begin   Create(AUrl,ATarget);   FDownloadProcedure := ADownloadProcedure; end;   constructor TAsyncDownloader.Create(AUrl:string;ATarget:TStream); begin   FTarget := ATarget;   FUrl := AUrl;     FDownloader := TIdHTTP.Create;   FDownloader.OnWork := HttpWork;   inherited Create(true); end; *) constructor TAsyncDownloader.Create; begin   FDownloader := TIdHTTP.Create;   FDownloader.OnWork := HttpWork;   FDownloader.HTTPOptions := [hoNoParseMetaHTTPEquiv];   FDownloader.HandleRedirects := true;   FState := TDownloadState.Initiate;   FOwnStream:=true;   inherited Create(true); end;   constructor TAsyncDownloader.Create(ADownloadProcedure:TDownloadProcedure); begin   Create;   FDownloadProcedure := ADownloadProcedure; end;   destructor TAsyncDownloader.Free; begin   FDownloader.Free;   inherited free; end;   procedure TAsyncDownloader.DownloadData(AUrl:String); begin   FUrl := AUrl;   FType := dltData;   FTarget := TMemoryStream.Create;   resume; end;   procedure TAsyncDownloader.DownloadData(AUrl:String;ATarget:TStream); begin   FUrl := AUrl;   FType := dltData;     if(assigned(ATarget)) then begin     FOwnStream := false;     FTarget := ATarget;   end;     resume; end;   procedure TAsyncDownloader.SetHeader; begin   with FDownloader.Request do begin     UserAgent := 'Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101 Firefox/19.0';     AcceptCharset := 'Utf-8;q=0.7,*;q=0.7';     AcceptLanguage := 'fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3';     Accept := 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8';     ContentType := 'application/x-www-form-urlencoded';   end; end;   procedure TAsyncDownloader.DownloadFile(AUrl, AFileName:String); begin   FType := dltFile;   FUrl := AUrl;   FFileName := AFileName;     FTarget := TFileStream.Create(AFileName,fmCreate);   resume; end;   procedure TAsyncDownloader.DownloadString(AUrl:String); begin   FType := dltString;   FUrl := AUrl;   resume; end;   procedure TAsyncDownloader.DoDownload; begin   if(Assigned(FDownloader)) then     FDownloadProcedure(FDownloader,FTarget); end;   procedure TAsyncDownloader.DoProgress; begin   if(assigned(FProgress)) then FProgress(self,FPercent); end;   procedure TAsyncDownloader.DoCompleteString; var   AHtml:String; begin   AHtml := FFileName;   FFileName:='';   if(assigned(FStringComplete)) then FStringComplete(self,AHtml); end;   procedure TAsyncDownloader.DoCompleteData; begin   if(assigned(FStringComplete)) then FDataComplete(self,FTarget);   if FOwnStream then FTarget.Free; end;   procedure TAsyncDownloader.DoCompleteFile; begin   if(assigned(FFileComplete)) then FFileComplete(self,FFileName);   if FOwnStream then FTarget.Free;   end;   procedure TAsyncDownloader.HttpWork(ASender: TObject; AWorkMode: TWorkMode; AWorkCount: Int64); var   Http: TIdHTTP;   ContentLength: Int64; begin   Http := TIdHTTP(ASender);   ContentLength := Http.Response.ContentLength;     if (Pos('chunked', LowerCase(Http.Response.TransferEncoding)) = 0) and      (ContentLength > 0) then   begin     FPercent := 100*AWorkCount div ContentLength;     Synchronize(DoProgress);   end; end;   procedure TAsyncDownloader.Execute; begin   FPercent :=0;   FState := TDownloadState.Downloading;   Synchronize(DoProgress);     if(Assigned(FDownloadProcedure)) then     Synchronize(DoDownload)   else begin       if FType = dltString then       FFileName := FDownloader.Get(FUrl)     else       FDownloader.Get(FUrl, FTarget);     end;   //This allow us to update the progress to 100%   if(FPercent <100) then begin     FPercent := 100;     Synchronize(DoProgress);   end;     FState := TDownloadState.Done;     if FType = dltString then       Synchronize(DoCompleteString)     else if FType = dltData then       Synchronize(DoCompleteData)     else if FType = dltFile then       Synchronize(DoCompleteFile); end;   end.