StrangeTools/ShowUserComment/Program.cs

using ImageMagick;
using System.Text;

#if DEBUG
Console.Write("Debug,Input file path:");
var filePath = Console.ReadLine();
#else
if (args.Length != 1)
{
    Console.Error.WriteLine("ERR: 1 file required from args");
    return 1;
}

var filePath = args[0];
#endif

var image = new MagickImage(filePath);

var parameters = image.GetAttribute("parameters");

if (parameters != null)
{
    Console.WriteLine(parameters);
}
else
{
    var x = image.GetExifProfile();
    if (x == null)
    {
        Console.Error.WriteLine("ERR: no exif profile found");
        return 2;
    }

    var p = new ExifProfile(x.ToByteArray()!);

    var v = p.GetValue(ExifTag.UserComment);
    if (v == null)
    {
        Console.Error.WriteLine("ERR: no exif UserComment found");
        return 3;
    }

    var s = Encoding.BigEndianUnicode.GetString(v.Value[8..]);

    Console.WriteLine(s);
}

return 0;