TIOParams.PNG_TextKeys

Declaration

property PNG_TextKeys: TStringList;

Description

Contains the keys associated with the list of values (PNG_TextValues property).

Note:
◼ PNG_TextKeys and PNG_TextValues must contain the same number of entries. Only uncompressed text is supported
◼ PNG_TextKeys works best with IELib

Examples

// Add author and other text info to a PNG file
ImageEnView1.IO.Params.PNG_TextKeys.Add('Author');
ImageEnView1.IO.Params.PNG_TextValues.Add('Letizia');
ImageEnView1.IO.Params.PNG_TextKeys.Add('Subject');
ImageEnView1.IO.Params.PNG_TextValues.Add('Colosseo');
ImageEnView1.IO.SaveToFile('D:\output.png');

// Find the "Author" text key
idx := ImageEnView1.IO.Params.PNG_TextKeys.IndexOf('Author');
if idx >= 0 then
  ShowMessage( 'Author is ' + ImageEnView1.IO.Params.PNG_TextValues[idx] )
else
  ShowMessage( 'Author is Unknown' );

// read all text info from a PNG
for i := 0 to ImageEnView1.IO.Params.PNG_TextKeys.Count - 1 do
begin
  key := ImageEnView1.IO.Params.PNG_TextKeys[i];
  value := ImageEnView1.IO.Params.PNG_TextValues[i];
  Memo1.Lines.Add( key + ': ' + value );
end;

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