glib命令行解析简单示例

这个例子是glib帮助文档上的，

我只是加了一个hook的调用和几个打印函数，以及一些注释。

以便更好理解这个程序。

#include <gtk/gtk.h>

#define GETTEXT_PACKAGE "test"

#define ENTRIES 5

#include <glib/gi18n.h>

static gint repeats = 2;

static gint max_size = 8;

static gboolean verbose = FALSE;

static gboolean beep = FALSE;

static gboolean rando = FALSE;

static GOptionEntry entries[] =

{

// long_name, short_name, flags, arg, arg_data, description, description_data

{ "repeats", 'r', 0, G_OPTION_ARG_INT, &repeats, "Average over N repetitions", "N" },

{ "max-size", 'm', 0, G_OPTION_ARG_INT, &max_size, "Test up to 2^M items", "M" },

{ "verbose", 'v', 0, G_OPTION_ARG_NONE, &verbose, "Be verbose", NULL },

{ "beep", 'b', 0, G_OPTION_ARG_NONE, &beep, "Beep when done", NULL },

{ "rando", 0, 0, G_OPTION_ARG_NONE, &rando, "Randomize the data", NULL },

{ NULL }

};

// show all input args

void dumpArgs(int argc, char *argv[]) {

int i;

for (i = 0; i < argc; i++) {

g_print ("args %d: %s\n", i, argv[i]);

}

g_print ("\n");

}

// show all updated variables

static inline void dumpVars() {

int i;

g_print ("\n");

g_print ("repeats: %d\n", repeats);

g_print ("max-size: %d\n", max_size);

g_print("beep: %s\n", beep?"true":"false");

g_print ("verbose: %s\n", verbose?"true":"false");

g_print ("rando: %s\n", rando?"true":"false");

}

static gboolean

parse_pre (GOptionContext * context, GOptionGroup * group, gpointer data,

GError ** error)

{

g_print("Enter parse_pre, called before parse");

return TRUE;

}

static gboolean

parse_post (GOptionContext * context, GOptionGroup * group, gpointer data,

GError ** error) {

g_print("Enter parse_post, called after parse. ");

return TRUE;

}

int

main (int argc, char *argv[])

{

GError *error = NULL;

GOptionContext *context;

context = g_option_context_new ("- test tree model performance");

g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);

GOptionGroup *group = gtk_get_option_group (TRUE);

g_option_context_add_group (context, group);

g_print ("input arg vector:\n");

dumpArgs(argc, argv);

// set hook function. i, we always start to work at parse_post function

g_option_group_set_parse_hooks (group, (GOptionParseFunc) parse_pre,

(GOptionParseFunc) parse_post);

if (!g_option_context_parse (context, &argc, &argv, &error))

{

g_print ("option parsing failed: %s\n", error->message);

exit (1);

}

// at here, variables had already been updated by g_option_context_parse.

g_print ("parsed arg vector:\n");

dumpArgs(argc, argv);

g_print ("updated variables:\n");

dumpVars();

/* ... */

}