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Showing content from https://docs.ruby-lang.org/en/master/Encoding/UndefinedConversionError.html below:

class Encoding::UndefinedConversionError - Documentation for Ruby 3.5

1. Encoding::
2. UndefinedConversionError

Raised by Encoding and String methods when a transcoding operation fails.

static VALUE
ecerr_destination_encoding(VALUE self)
{
    return rb_attr_get(self, id_destination_encoding);
}

Returns the destination encoding as an encoding object.

static VALUE
ecerr_destination_encoding_name(VALUE self)
{
    return rb_attr_get(self, id_destination_encoding_name);
}

Returns the destination encoding name as a string.

static VALUE
ecerr_error_char(VALUE self)
{
    return rb_attr_get(self, id_error_char);
}

Returns the one-character string which cause Encoding::UndefinedConversionError.

ec = Encoding::Converter.new("ISO-8859-1", "EUC-JP")
begin
  ec.convert("\xa0")
rescue Encoding::UndefinedConversionError
  puts $!.error_char.dump   
  p $!.error_char.encoding  
end

static VALUE
ecerr_source_encoding(VALUE self)
{
    return rb_attr_get(self, id_source_encoding);
}

Returns the source encoding as an encoding object.

Note that the result may not be equal to the source encoding of the encoding converter if the conversion has multiple steps.

ec = Encoding::Converter.new("ISO-8859-1", "EUC-JP") 
begin
  ec.convert("\xa0") 
rescue Encoding::UndefinedConversionError
  p $!.source_encoding              
  p $!.destination_encoding         
  p $!.source_encoding_name         
  p $!.destination_encoding_name    
end

static VALUE
ecerr_source_encoding_name(VALUE self)
{
    return rb_attr_get(self, id_source_encoding_name);
}

Returns the source encoding name as a string.

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