2 * Copyright (c) 2005, Herve Drolon, FreeImage Team
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30 @brief Implementation of a event callback system
32 The functions in EVENT.C have for goal to send output messages (errors, warnings, debug) to the user.
35 Message handler object
40 <li>Debugging messages
44 typedef struct opj_event_mgr
46 /** Data to call the event manager upon */
48 /** Data to call the event manager upon */
49 void * m_warning_data;
50 /** Data to call the event manager upon */
52 /** Error message callback if available, NULL otherwise */
53 opj_msg_callback error_handler;
54 /** Warning message callback if available, NULL otherwise */
55 opj_msg_callback warning_handler;
56 /** Debug message callback if available, NULL otherwise */
57 opj_msg_callback info_handler;
61 #define EVT_ERROR 1 /**< Error event type */
62 #define EVT_WARNING 2 /**< Warning event type */
63 #define EVT_INFO 4 /**< Debug event type */
65 /** @defgroup EVENT EVENT - Implementation of a event callback system */
68 /** @name Exported functions (see also openjpeg.h) */
70 /* ----------------------------------------------------------------------- */
73 /* ----------------------------------------------------------------------- */
76 * Write formatted data to a string and send the string to a user callback.
78 * @param event_mgr Event handler
79 * @param event_type Event type or callback to use to send the message
80 * @param fmt Format-control string (plus optional arguments)
82 * @return Returns true if successful, returns false otherwise
84 opj_bool opj_event_msg(opj_event_mgr_t* event_mgr, int event_type, const char *fmt, ...);
85 /* ----------------------------------------------------------------------- */
88 * Set the event manager with the default callback function for the 3 levels.
90 void opj_set_default_event_handler(opj_event_mgr_t * p_manager);
96 #endif /* __EVENT_H */