Struct rxing::oned::Code39Reader

pub struct Code39Reader { /* private fields */ }

Decodes Code 39 barcodes. Supports "Full ASCII Code 39" if USE_CODE_39_EXTENDED_MODE is set.

@author Sean Owen @see Code93Reader

Implementations

impl Code39Reader

pub const ALPHABET_STRING: &'static str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%"

pub const CHARACTER_ENCODINGS: [u32; 43] = _

These represent the encodings of characters, as patterns of wide and narrow bars. The 9 least-significant bits of each int correspond to the pattern of wide and narrow, with 1s representing “wide” and 0s representing narrow.

pub const ASTERISK_ENCODING: u32 = 148u32

pub fn new() -> Self

Creates a reader that assumes all encoded data is data, and does not treat the final character as a check digit. It will not decoded “extended Code 39” sequences.

pub fn with_use_check_digit(usingCheckDigit: bool) -> Self

Creates a reader that can be configured to check the last character as a check digit. It will not decoded “extended Code 39” sequences.

@param usingCheckDigit if true, treat the last data character as a check digit, not data, and verify that the checksum passes.

pub fn with_all_config(usingCheckDigit: bool, extendedMode: bool) -> Self

Creates a reader that can be configured to check the last character as a check digit, or optionally attempt to decode “extended Code 39” sequences that are used to encode the full ASCII character set.

@param usingCheckDigit if true, treat the last data character as a check digit, not data, and verify that the checksum passes. @param extendedMode if true, will attempt to decode extended Code 39 sequences in the text.

Trait Implementations

impl Default for Code39Reader

fn default() -> Self

Returns the “default value” for a type.

impl OneDReader for Code39Reader

fn decode_row( &mut self, rowNumber: u32, row: &BitArray, _hints: &DecodingHintDictionary ) -> Result<RXingResult>

Attempts to decode a one-dimensional barcode format given a single row of

fn _do_decode<B: Binarizer>( &mut self, image: &mut BinaryBitmap<B>, hints: &DecodingHintDictionary ) -> Result<RXingResult>

We’re going to examine rows from the middle outward, searching alternately above and below the middle, and farther out each time. rowStep is the number of rows between each successive attempt above and below the middle. So we’d scan row middle, then middle - rowStep, then middle + rowStep, then middle - (2 * rowStep), etc. rowStep is bigger as the image is taller, but is always at least 1. We’ve somewhat arbitrarily decided that moving up and down by about 1/16 of the image is pretty good; we try more of the image if “trying harder”.

impl Reader for Code39Reader

fn decode<B: Binarizer>( &mut self, image: &mut BinaryBitmap<B> ) -> Result<RXingResult, Exceptions>

Locates and decodes a barcode in some format within an image.

fn decode_with_hints<B: Binarizer>( &mut self, image: &mut BinaryBitmap<B>, hints: &DecodingHintDictionary ) -> Result<RXingResult, Exceptions>

Locates and decodes a barcode in some format within an image. This method also accepts hints, each possibly associated to some data, which may help the implementation decode.

fn reset(&mut self)

Resets any internal state the implementation has after a decode, to prepare it for reuse.