(Delphi DLL) Update a String Property in XMP

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and update the value of a string property. (If the string property does not already exist, it is created.)

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;

begin
// This example assumes 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.
success := CkXmp_LoadAppFile(xmp,'qa_data/xmp/AJ_123642_1511.tif');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmp__lastErrorText(xmp));
    Exit;
  end;

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

// This example assumes that XMP metadata is already present in the image file.
if (CkXmp_getNumEmbedded(xmp) = 0) then
  begin
    Memo1.Lines.Add('No XMP metadata already exists..');
    Exit;
  end;

// Get the XMP metadata.

xml := CkXmp_GetEmbedded(xmp,0);

// Show the XML:
Memo1.Lines.Add(CkXml__getXml(xml));

// Update (overwrite) a string property.
CkXmp_AddSimpleStr(xmp,xml,'NumberofTimes','123');

success := CkXmp_SaveAppFile(xmp,'qa_output/updated.tif');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmp__lastErrorText(xmp));
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkXmp_Dispose(xmp);

end;