日志输出 定义

3 down vote accepted

/* * There are three levels of logging: debug, info and error, and each can be enabled independently * via the ENLOGGING_LEVEL_DEBUG, ENLOGGING_LEVEL_INFO, and ENLOGGING_LEVEL_ERROR switches below, respectively. * In addition, ALL logging can be enabled or disabled via the ENLOGGING_ENABLED switch below. * * To perform logging, use any of the following function calls in your code: * * ENDebug(fmt, …) – will print if ENLOGGING_LEVEL_DEBUG is set on. * ENInfo(fmt, …) – will print if ENLOGGING_LEVEL_INFO is set on. * ENHeading(fmt, …) – will print if ENLOGGING_LEVEL_INFO is set on. * ENError(fmt, …) – will print if ENLOGGING_LEVEL_ERROR is set on. * * Each logging entry can optionally automatically include class, method and line information by * enabling the ENLOGGING_INCLUDE_CODE_LOCATION switch. * * Logging functions are implemented here via macros, so disabling logging, either entirely, * or at a specific level, removes the corresponding log invocations from the compiled code, * thus completely eliminating both the memory and CPU overhead that the logging calls would add. */#define ENLOGGING_ENABLED 1// Set any or all of these switches to enable or disable logging at specific levels.#define ENLOGGING_LEVEL_DEBUG 1#define ENLOGGING_LEVEL_INFO 1#define ENLOGGING_LEVEL_ERROR 1// Set this switch to set whether or not to include class, method and line information in the log entries.#define ENLOGGING_INCLUDE_CODE_LOCATION 0////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// Implementation////////////////////////////////////////////////////////////////////////////////////////////////////////////////////#if !(defined(ENLOGGING_ENABLED) && ENLOGGING_ENABLED)#undef ENLOGGING_LEVEL_DEBUG#undef ENLOGGING_LEVEL_INFO#undef ENLOGGING_LEVEL_ERROR#endif// Logging format#define ENLOG_FORMAT_NO_LOCATION(fmt, lvl, ...) NSLog((@"[%@] " fmt), lvl, ##__VA_ARGS__)#define ENLOG_FORMAT_WITH_LOCATION(fmt, lvl, ...) NSLog((@"%s [Line %d] [%@] " fmt), __PRETTY_FUNCTION__, __LINE__, lvl, ##__VA_ARGS__)#if defined(ENLOGGING_INCLUDE_CODE_LOCATION) && ENLOGGING_INCLUDE_CODE_LOCATION#define ENLOG_FORMAT(fmt, lvl, ...) ENLOG_FORMAT_WITH_LOCATION(fmt, lvl, ##__VA_ARGS__)#else#define ENLOG_FORMAT(fmt, lvl, ...) ENLOG_FORMAT_NO_LOCATION(fmt, lvl, ##__VA_ARGS__)#endif// Debug level logging#if defined(ENLOGGING_LEVEL_DEBUG) && ENLOGGING_LEVEL_DEBUG#define ENDebug(fmt, ...) ENLOG_FORMAT(fmt, @"debug", ##__VA_ARGS__)#else#define ENDebug(...)#endif// Info level logging#if defined(ENLOGGING_LEVEL_INFO) && ENLOGGING_LEVEL_INFO#define ENInfo(fmt, ...) ENLOG_FORMAT(fmt, @"info", ##__VA_ARGS__)#define ENHeading(fmt, ...) ENLOG_FORMAT(@"####################  " fmt "  ####################", @"HD", ##__VA_ARGS__)#else#define ENInfo(...)#define ENHeading(...)#endif// Error level logging#if defined(ENLOGGING_LEVEL_ERROR) && ENLOGGING_LEVEL_ERROR#define ENError(fmt, ...) ENLOG_FORMAT(fmt, @"***ERROR***", ##__VA_ARGS__)#else#define ENError(...)#endif#if defined(ENLOGGING_LEVEL_ERROR) && ENLOGGING_LEVEL_ERROR#define ENResult(result, error) if (result == NO) ENError("%@", error)#else#define ENResult(...)#endifhttp://stackoverflow.com/questions/7294215/what-logging-solutions-to-use-while-log-debugging-objective-c-code/7294231#7294231