Pascal (Lazarus/Delphi)

Fetch ISBN XML from isbndb.com and Parse

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Demonstrates sending a query to isbndb.com and parsing the XML response. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Xml,
  Chilkat.Http;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  strXml: string;
  xml: TXml;
  xml2: TXml;

begin
  success := False;

  //  This example assumes the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  http := THttp.Create;

  //  The access_key in this URL is a valid access key, but limited to 100 queries per day.
  //  If the key does not work, it may be that others were testing and exhausted the limit.
  strXml := http.QuickGetStr('http://isbndb.com/api/books.xml?access_key=OV8L2Y9I&results=details&index1=isbn&value1=0443074348');
  if (http.LastMethodSuccess <> True) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  xml := TXml.Create;
  success := xml.LoadXml(strXml);

  //  The XML returned for this URL is the following:

  //  <?xml version="1.0" encoding="UTF-8" ?>

  //  <ISBNdb server_time="2007-10-25T14:07:25Z">
  //      <BookList total_results="1" page_size="10" page_number="1" shown_results="1">
  //          <BookData book_id="diagnostic_histopathology_of_tumors_2_volume_set_with_cd_rom" isbn="0443074348">
  //              <Title>Diagnostic Histopathology of Tumors: 2-Volume Set with CD-ROMs</Title>
  //              <TitleLong>Diagnostic Histopathology of Tumors: 2-Volume Set with CD-ROMs (Diagnostic Histopathology of Tumors (Fletcher))</TitleLong>
  //              <AuthorsText>Christopher D. M. Fletcher (Editor)</AuthorsText>
  //              <PublisherText publisher_id="churchill_livingstone">Churchill Livingstone</PublisherText>
  //              <Details dewey_decimal="616" physical_description_text="2166 pages" language="" edition_info="Hardcover; 2007-03-13" dewey_decimal_normalized="616" lcc_number="" change_time="2006-12-13T14:53:42Z" price_time="2007-10-25T01:12:13Z" />
  //          </BookData>
  //      </BookList>
  //  </ISBNdb>

  //  First, navigate to the BookData node:
  success := xml.FirstChild2();
  success := xml.FirstChild2();

  //  Show the Title and AuthorsText:
  WriteLn(xml.GetChildContent('Title'));
  WriteLn(xml.GetChildContent('AuthorsText'));

  //  Show the publisher_id attribute of the PublisherText node:

  xml2 := xml.FindChild('PublisherText');
  WriteLn(xml2.GetAttrValue('publisher_id'));

  xml2.Free;

  //  Save the XML to a file:
  success := xml.SaveXml('book.xml');


  http.Free;
  xml.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.