November 2019
Beginner to intermediate
674 pages
15h
English
Content preview from Mastering Delphi Programming: A Complete Reference Guide
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Downloader stage
The downloader stage uses a THTTPClient object to download the web page. This task is implemented in the Asy_HttpGet method, as follows:
procedure TWebSpider.Asy_HttpGet( inQueue: TThreadedQueue<string>; outQueue: TThreadedQueue<THttpPage>);var httpClient: THTTPClient; response: IHTTPResponse; url: string;begin TThread.NameThreadForDebugging('Http get'); httpClient := THTTPClient.Create; try while inQueue.PopItem(url) = wrSignaled do begin if inQueue.ShutDown then break; //while try response := httpClient.Get(url); except if TInterlocked.Decrement(FPageCount) = 0 then NotifyFinished; end; if (response.StatusCode div 100) = 2 then outQueue.PushItem(THttpPage.Create(url, response)) else if TInterlocked.Decrement(FPageCount) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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