Pascal (Lazarus/Delphi)

Update a String Property in XMP

See more XMP Examples

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.) 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.Xmp,
  Chilkat.Xml;

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

procedure RunDemo;
var
  success: Boolean;
  xmp: TXmp;
  xml: TXml;

begin
  success := False;

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

  xmp := TXmp.Create;

  //  Load a JPG or TIF image file.
  success := xmp.LoadAppFile('qa_data/xmp/AJ_123642_1511.tif');
  if (success <> True) then
    begin
      WriteLn(xmp.LastErrorText);
      Exit;
    end;

  WriteLn('Num embedded XMP docs: ' + xmp.NumEmbedded);

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

  //  Get the XMP metadata.

  xml := xmp.GetEmbedded(0);

  //  Show the XML:
  WriteLn(xml.GetXml());

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

  success := xmp.SaveAppFile('qa_output/updated.tif');
  if (success <> True) then
    begin
      WriteLn(xmp.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  xmp.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.