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Diffstat (limited to 'include/zbar/Decoder.h')
| -rw-r--r-- | include/zbar/Decoder.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/include/zbar/Decoder.h b/include/zbar/Decoder.h new file mode 100644 index 0000000..60d34c3 --- /dev/null +++ b/include/zbar/Decoder.h @@ -0,0 +1,203 @@ +//------------------------------------------------------------------------ +// Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net> +// +// This file is part of the ZBar Bar Code Reader. +// +// The ZBar Bar Code Reader is free software; you can redistribute it +// and/or modify it under the terms of the GNU Lesser Public License as +// published by the Free Software Foundation; either version 2.1 of +// the License, or (at your option) any later version. +// +// The ZBar Bar Code Reader is distributed in the hope that it will be +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser Public License for more details. +// +// You should have received a copy of the GNU Lesser Public License +// along with the ZBar Bar Code Reader; if not, write to the Free +// Software Foundation, Inc., 51 Franklin St, Fifth Floor, +// Boston, MA 02110-1301 USA +// +// http://sourceforge.net/projects/zbar +//------------------------------------------------------------------------ +#ifndef _ZBAR_DECODER_H_ +#define _ZBAR_DECODER_H_ + +/// @file +/// Decoder C++ wrapper + +#ifndef _ZBAR_H_ +#error "include zbar.h in your application, **not** zbar/Decoder.h" +#endif + +#include <string> + +namespace zbar +{ +/// low-level bar width stream decoder interface. +/// identifies symbols and extracts encoded data + +class Decoder +{ +public: + /// Decoder result handler. + /// applications should subtype this and pass an instance to + /// set_handler() to implement result processing + class Handler + { + public: + virtual ~Handler() + { + } + + /// invoked by the Decoder as decode results become available. + virtual void decode_callback(Decoder &decoder) = 0; + }; + + /// constructor. + Decoder() : _handler(NULL) + { + _decoder = zbar_decoder_create(); + } + + ~Decoder() + { + zbar_decoder_destroy(_decoder); + } + + /// clear all decoder state. + /// see zbar_decoder_reset() + void reset() + { + zbar_decoder_reset(_decoder); + } + + /// mark start of a new scan pass. + /// see zbar_decoder_new_scan() + void new_scan() + { + zbar_decoder_new_scan(_decoder); + } + + /// process next bar/space width from input stream. + /// see zbar_decode_width() + zbar_symbol_type_t decode_width(unsigned width) + { + return (zbar_decode_width(_decoder, width)); + } + + /// process next bar/space width from input stream. + /// see zbar_decode_width() + Decoder &operator<<(unsigned width) + { + zbar_decode_width(_decoder, width); + return (*this); + } + + /// retrieve color of @em next element passed to Decoder. + /// see zbar_decoder_get_color() + zbar_color_t get_color() const + { + return (zbar_decoder_get_color(_decoder)); + } + + /// retrieve last decoded symbol type. + /// see zbar_decoder_get_type() + zbar_symbol_type_t get_type() const + { + return (zbar_decoder_get_type(_decoder)); + } + + /// retrieve string name of last decoded symbol type. + /// see zbar_get_symbol_name() + const char *get_symbol_name() const + { + return (zbar_get_symbol_name(zbar_decoder_get_type(_decoder))); + } + + /// retrieve string name for last decode addon. + /// see zbar_get_addon_name() + /// @deprecated in 0.11 + const char *get_addon_name() const + { + return (zbar_get_addon_name(zbar_decoder_get_type(_decoder))); + } + + /// retrieve last decoded data in ASCII format as a char array. + /// see zbar_decoder_get_data() + const char *get_data_chars() const + { + return (zbar_decoder_get_data(_decoder)); + } + + /// retrieve last decoded data as a std::string. + /// see zbar_decoder_get_data() + const std::string get_data_string() const + { + return (std::string(zbar_decoder_get_data(_decoder), + zbar_decoder_get_data_length(_decoder))); + } + + /// retrieve last decoded data as a std::string. + /// see zbar_decoder_get_data() + const std::string get_data() const + { + return (get_data_string()); + } + + /// retrieve length of decoded binary data. + /// see zbar_decoder_get_data_length() + int get_data_length() const + { + return (zbar_decoder_get_data_length(_decoder)); + } + + /// retrieve last decode direction. + /// see zbar_decoder_get_direction() + /// @since 0.11 + int get_direction() const + { + return (zbar_decoder_get_direction(_decoder)); + } + + /// setup callback to handle result data. + void set_handler(Handler &handler) + { + _handler = &handler; + zbar_decoder_set_handler(_decoder, _cb); + zbar_decoder_set_userdata(_decoder, this); + } + + /// set config for indicated symbology (0 for all) to specified value. + /// @see zbar_decoder_set_config() + /// @since 0.4 + int set_config(zbar_symbol_type_t symbology, zbar_config_t config, + int value) + { + return (zbar_decoder_set_config(_decoder, symbology, config, value)); + } + + /// set config parsed from configuration string. + /// @see zbar_decoder_parse_config() + /// @since 0.4 + int set_config(std::string cfgstr) + { + return (zbar_decoder_parse_config(_decoder, cfgstr.c_str())); + } + +private: + friend class Scanner; + zbar_decoder_t *_decoder; + Handler *_handler; + + static void _cb(zbar_decoder_t *cdcode) + { + Decoder *dcode = (Decoder *)zbar_decoder_get_userdata(cdcode); + if (dcode && dcode->_handler) + dcode->_handler->decode_callback(*dcode); + } +}; + +} // namespace zbar + +#endif |