glib学习笔记之六——处理命令行参数

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官方文档：http://developer.gnome.org/glib/stable/glib-Commandline-option-parser.html

在connman中使用GOptionEntry结构体处理命令行参数，结构体形式如下：

static GOptionEntry options[] = {        { "debug", 'd', G_OPTION_FLAG_OPTIONAL_ARG,                                G_OPTION_ARG_CALLBACK, parse_debug,                                "Specify debug options to enable", "DEBUG" },        { "device", 'i', 0, G_OPTION_ARG_STRING, &option_device,                        "Specify networking device or interface", "DEV" },        { "nodevice", 'I', 0, G_OPTION_ARG_STRING, &option_nodevice,                        "Specify networking interface to ignore", "DEV" },        { "plugin", 'p', 0, G_OPTION_ARG_STRING, &option_plugin,                                "Specify plugins to load", "NAME,..." },        { "noplugin", 'P', 0, G_OPTION_ARG_STRING, &option_noplugin,                                "Specify plugins not to load", "NAME,..." },        { "wifi", 'W', 0, G_OPTION_ARG_STRING, &option_wifi,                                "Specify driver for WiFi/Supplicant", "NAME" },        { "nodaemon", 'n', G_OPTION_FLAG_REVERSE,                                G_OPTION_ARG_NONE, &option_detach,                                "Don't fork daemon to background" },        { "nodnsproxy", 'r', G_OPTION_FLAG_REVERSE,                                G_OPTION_ARG_NONE, &option_dnsproxy,                                "Don't enable DNS Proxy" },        { "compat", 'c', 0, G_OPTION_ARG_NONE, &option_compat,                                "(obsolete)" },        { "version", 'v', 0, G_OPTION_ARG_NONE, &option_version,                                "Show version information and exit" },        { NULL },};

建立结构体之后，创建context，将context与GOptionEntry关联，然后将命令行参数传入到context进行分析

        context = g_option_context_new(NULL);        g_option_context_add_main_entries(context, options, NULL);        if (g_option_context_parse(context, &argc, &argv, &error) == FALSE) {                if (error != NULL) {                        g_printerr("%s\n", error->message);                        g_error_free(error);                } else                        g_printerr("An unknown error occurred\n");                exit(1);        }

最后，分析的过程会将GOptionEntry结构体定义的options中的各个标记进行相应的处理