(Delphi DLL) Fetch ISBN XML from isbndb.com and Parse

Demonstrates sending a query to isbndb.com and parsing the XML response.

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, Xml, Http;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
strXml: PWideChar;
xml: HCkXml;
success: Boolean;
xml2: HCkXml;

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

http := CkHttp_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 := CkHttp__quickGetStr(http,'http://isbndb.com/api/books.xml?access_key=OV8L2Y9I&results=details&index1=isbn&value1=0443074348');
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

xml := CkXml_Create();
success := CkXml_LoadXml(xml,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 := CkXml_FirstChild2(xml);
success := CkXml_FirstChild2(xml);

// Show the Title and AuthorsText:
Memo1.Lines.Add(CkXml__getChildContent(xml,'Title'));
Memo1.Lines.Add(CkXml__getChildContent(xml,'AuthorsText'));

// Show the publisher_id attribute of the PublisherText node:

xml2 := CkXml_FindChild(xml,'PublisherText');
Memo1.Lines.Add(CkXml__getAttrValue(xml2,'publisher_id'));

CkXml_Dispose(xml2);

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

CkHttp_Dispose(http);
CkXml_Dispose(xml);

end;