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CHAPTER 6 USING GLIB
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Throughout this chapter and later chapters, you will need a way to report textual errors, information, and warnings to the user. It is possible to use g_print() for all of these messages, but GLib provides a logging system with some useful features. Any type of textual message can be conveyed using g_log(). The first parameter of this function allows you to define a custom log domain. The log domain is a string that is passed to GLogFunc that is used to help the user to differentiate messages that were output by your application from those outputted by other libraries. void g_log (const gchar *log_domain, GLogLevelFlags log_level, const gchar *message, ...); Unless you are creating a library, you should use G_LOG_DOMAIN as the domain. Any text specified to the log domain parameter will be prepended to the beginning of messages before they are output. If you do not specify a log domain, G_LOG_DOMAIN will be used. For example, the GTK+ library specifies "Gtk" as the domain so the user will know from where the messages have been emitted. The second parameter of g_log() allows you to specify what type of message is being reported. For example, if you are reporting an error message that should cause the application to be terminated, you should use G_LOG_LEVEL_ERROR. A list of GLogLevelFlags follows: G_LOG_FLAG_RECURSION: A flag used for recursive messages. G_LOG_FLAG_FATAL: Log levels that are set with this flag will cause the application to quit and the core to be dumped when called. G_LOG_LEVEL_ERROR: A type of error that is always fatal. G_LOG_LEVEL_CRITICAL: A nonfatal error that is more important than a warning but does not need the application to quit. G_LOG_LEVEL_WARNING: A warning of something that will not cause the application to be unable to continue. G_LOG_LEVEL_MESSAGE: Used to log normal messages that are not critical. G_LOG_LEVEL_INFO: Any other type of message not covered by the other levels, such as general information. G_LOG_LEVEL_DEBUG: A general message used for debugging purposes. G_LOG_LEVEL_MASK: Equal to (G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL).
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Note As an example, g_malloc() terminates the application when memory allocation fails, because
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G_LOG_LEVEL_ERROR is used. On the other hand, g_try_malloc() will not output any message when allocation fails. Instead, it returns a NULL pointer.
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CHAPTER 6 USING GLIB
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The actual error message reported to g_log() should be in the same format reported to g_print(). For the sake of convenience, GLib also provides five functions that allow you to bypass the domain and flag parameters of g_log(). The message reported by these functions should also be formatted in the same manner as g_print(). These functions correspond directly to the specified log flags and will be emitted under the G_LOG_DOMAIN domain. The functions, along with their associated log flags, follow: void void void void void g_message (...); g_warning (...); g_critical (...); g_error (...); g_debug (...); /* /* /* /* /* G_LOG_LEVEL_MESSAGE */ G_LOG_LEVEL_WARNING */ G_LOG_LEVEL_CRITICAL */ G_LOG_LEVEL_ERROR */ G_LOG_LEVEL_DEBUG */
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Lastly, depending on how your application handles messages, you may want to make other types of messages fatal. By default, only the G_LOG_LEVEL_ERROR flag will cause the application to be terminated. No matter what, this level is always fatal. To make another type of message fatal, you can call g_log_set_always_fatal(). This will associate the G_LOG_FLAG_FATAL flag with the specified level. g_log_set_always_fatal (G_LOG_LEVEL_DEBUG | G_LOG_LEVEL_WARNING); For example, the preceding example command will force the application to terminate when you report debugging and warning messages to the user. This feature should be used sparingly, because not all errors or warnings should cause the application to terminate!
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Memory Management
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Memory management is an extremely important aspect of any application and becomes increasingly significant as your application grows in size and complexity. While there are a large number of functions provided for memory management in GLib, this section will cover only those that are used most often.
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