(Delphi DLL) Get a Structure Property Value from XMP

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and fetch the value of a structure property, such as the Iptc4xmpCore:CiTelWork (found within the Iptc4xmpCore:CreatorContactInfo structure).

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, Xmp, Xml;

...

procedure TForm1.Button1Click(Sender: TObject);
var
xmp: HCkXmp;
success: Boolean;
xml: HCkXml;
propVal: PWideChar;

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

xmp := CkXmp_Create();

// Load a JPG or TIF image file.
// Sample JPG's with XMP metadata may be found at:
// http://www.chilkatsoft.com/testData/xmp/sample1.jpg
// http://www.chilkatsoft.com/testData/xmp/sample2.jpg
// http://www.chilkatsoft.com/testData/xmp/sample3.jpg
success := CkXmp_LoadAppFile(xmp,'sample1.jpg');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmp__lastErrorText(xmp));
    Exit;
  end;

Memo1.Lines.Add('Num embedded XMP docs: ' + IntToStr(CkXmp_getNumEmbedded(xmp)));

// Assuming there is at least one, get the 1st.
// (There is typically never more than one, but theoretically it's possible.)
xml := CkXmp_GetEmbedded(xmp,0);
if (CkXmp_getLastMethodSuccess(xmp) = True) then
  begin

    propVal := CkXmp__getStructValue(xmp,xml,'Iptc4xmpCore:CreatorContactInfo','Iptc4xmpCore:CiTelWork');
    if (CkXmp_getLastMethodSuccess(xmp) <> True) then
      begin
        Memo1.Lines.Add('Not found.');
      end
    else
      begin
        Memo1.Lines.Add(propVal);
      end;
    CkXml_Dispose(xml);

  end
else
  begin
    Memo1.Lines.Add(CkXmp__lastErrorText(xmp));
  end;

CkXmp_Dispose(xmp);

end;