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
◼The maximum length for a PNG text key is 79 printable Latin characters (ISO 8859-1). There is no explicit maximum length for text values
// 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;