(Delphi DLL) Avoid URLs Matching Any of a Set of Patterns

Demonstrates how to use "avoid patterns" to prevent spidering any URL that matches a wildcarded pattern. This example avoids URLs containing the substrings "java", "python", or "perl".

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Spider;

...

procedure TForm1.Button1Click(Sender: TObject);
var
spider: HCkSpider;
i: Integer;
success: Boolean;

begin
spider := CkSpider_Create();

// The spider object crawls a single web site at a time.  As you'll see
// in later examples, you can collect outbound links and use them to 
// crawl the web.  For now, we'll simply spider 10 pages of chilkatsoft.com
CkSpider_Initialize(spider,'www.chilkatsoft.com');

// Add the 1st URL:
CkSpider_AddUnspidered(spider,'http://www.chilkatsoft.com/');

// Avoid URLs matching these patterns:
CkSpider_AddAvoidPattern(spider,'*java*');
CkSpider_AddAvoidPattern(spider,'*python*');
CkSpider_AddAvoidPattern(spider,'*perl*');

// Begin crawling the site by calling CrawlNext repeatedly.

for i := 0 to 9 do
  begin

    success := CkSpider_CrawlNext(spider);
    if (success = True) then
      begin
        // Show the URL of the page just spidered.
        Memo1.Lines.Add(CkSpider__lastUrl(spider));
        // The HTML is available in the LastHtml property
      end
    else
      begin
        // Did we get an error or are there no more URLs to crawl?
        if (CkSpider_getNumUnspidered(spider) = 0) then
          begin
            Memo1.Lines.Add('No more URLs to spider');
          end
        else
          begin
            Memo1.Lines.Add(CkSpider__lastErrorText(spider));
          end;
      end;
    // Sleep 1 second before spidering the next URL.
    CkSpider_SleepMs(spider,1000);
  end;

CkSpider_Dispose(spider);

end;