1.概述
传统的命令行解析,如果提供的参数很多，程序很不灵活，并且很容易出问题：
while(getopt())
{
swtich() {
case:
case:
case:
}
}
比如实现下面这个参数，实现起来还是非常麻烦的。
[root@localhost glib_test]# ./glib_test -?
Usage:
glib_test [OPTION...]
Help Options:
-?, --help Show help options
--help-all Show all help options
--help-test group display help output
Application Options:
-n, --nodaemon Don't run as daemon in background
-d, --debug Enable debug information output
-s, --size=M Input your size
2.使用方法
glib提供了一套解析命令行的函数，程序实现如下：
#include <stdio.h>
#include <glib.h>
//#include <stdlib.h>
//#include <unistd.h>
static gboolean option_detach = FALSE;
static gboolean option_debug = FALSE;
static gint size = 8;
static GOptionEntry options[] = {
{ "nodaemon", 'n', 0,
G_OPTION_ARG_NONE, &option_detach,
"Don't run as daemon in background" },
{ "debug", 'd', 0,
G_OPTION_ARG_NONE, &option_debug,
"Enable debug information output" },
{ "size", 's', 0,
G_OPTION_ARG_INT, &size,
"Input your size","M" },
{ NULL },
};
int main(int argc, char *argv[])
{
GOptionContext *context;
GError *err = NULL;
GOptionGroup *g_group;
context = g_option_context_new(NULL);
g_group = g_option_group_new("test group","test group display",
"display help output", NULL, NULL);
g_option_context_add_main_entries(context, options, NULL);
g_option_context_add_group(context,g_group);
if (g_option_context_parse(context, &argc, &argv, &err) == FALSE) {
if (err != NULL) {
g_printerr("%s\n", err->message);
g_error_free(err);
} else
g_printerr("An unknown error occurred\n");
exit(1);
}
g_option_context_free(context);
if (option_debug == FALSE) {
g_printf("option debug disable\n");
} else {
g_printf("option debug enable\n");
}
if (option_detach == FALSE) {
g_printf("option detach disable\n");
} else {
g_printf("option detach enable\n");
}
printf("size=%d\n",size);
return 0;
}