Glib (1) Key-value file parser

Glib中有個功能，Key-value file parser 是用來讀取你一個設定檔，如一般常看到的.ini or .conf ，運用glib 可以很容易分析出所設定的參數。用一個小程式來了解如何運用這項功能:
demo file: keyfile.c myconf.ini


keyfile.c

#include <stdio.h>
#include <glib.h>

typedef struct
{
  gchar **prod;
  gint *price;
} GOODS;

int main()
{
  GOODS *conf;
  GKeyFile *keyfile;
  GKeyFileFlags flags;
  GError *error = NULL;
  int channel;
  double freq;
  gsize length;
  int i;
  
// Create a new GKeyFile object and a bitwise list of flags.
  keyfile = g_key_file_new();
  flags = G_KEY_FILE_KEEP_COMMENTS | G_KEY_FILE_KEEP_TRANSLATIONS;

// Load the GKeyFile from keyfile.conf or return.
  if (!g_key_file_load_from_file (keyfile, "myconf.ini", flags, &error))
     return 0;
 
  printf("[doc]\n");
  printf("value: %d\n", g_key_file_get_integer(keyfile, "doc", "value", NULL));
  printf("version: %s\n", g_key_file_get_string(keyfile, "doc", "version", NULL));
 
  printf("\n[TV]\n");
  if (g_key_file_get_boolean(keyfile, "tv", "on", NULL))
     printf("TV: true\n");
  else
     printf("TV: true\n");
  channel=g_key_file_get_integer(keyfile, "tv", "channel", NULL);
  freq=g_key_file_get_double(keyfile, "tv", "Hz", NULL);
  printf("TV: %d\n", channel);
  printf("TV: %f\n",freq);
 
  /* Create a new Settings object. If you are using GTK+ 2.8 or below, you should use g_new() or g_malloc() instead! */
  conf = g_slice_new (GOODS);
 
  conf->prod = g_key_file_get_string_list(keyfile, "LIST","prod_list", &length, NULL);
  conf->price= g_key_file_get_integer_list(keyfile, "LIST","price_list", &length, NULL);
  
  printf("\n[LIST]\n");
  printf("name: ");  
  for(i=0;i    printf("%s ",conf->prod[i]);
  
  printf("\nprice: ");  
  for(i=0;i    printf("%d ",conf->price[i]);
  
  printf("\n");

  return 0;
}

myconf.ini

# This is a example
 
[doc]
value=66
version=2.6.17
 
[tv]
on=yes
channel=23
Hz=59.6
 
[LIST]
prod_list=book;coffee;pen
price_list=23;54;3

接下來編譯:

 
[root@ecken02 glib]# arm-linux-gcc -Wall -static `arm-linux-pkg-config --cflags --libs glib-2.0` -o keyfile keyfile.c -lglib-2.0 -liconv -lintl
 
移到版子上執行
sh-3.2# ./keyfile
[doc]
value: 66
version: 2.6.17
 
[TV]
TV: true
TV: 23
TV: 59.600000
 
[LIST]
name: book coffee pen
price: 23 54 3
sh-3.2#

它已經將設定檔的值讀出來了，不過感覺執行的速度有點慢....

sh-3.2# ls -l
-rwxrw-r-- 1 root root 152 Nov 9 2009 Makefile
-rwxr-xr-x 1 root root 2304376 Nov 23 2009 keyfile
-rwxrw-r-- 1 root root 1641 Nov 9 2009 keyfile.c
-rwxrw-r-- 1 root root 136 Nov 9 2009 myconf.ini
sh-3.2#

天啊 !! 想不到執行檔要2.3M，真是不符合軟體短小精幹的要求。
再去掉不必要的symbol，

sh-3.2# ls -l
-rwxrw-r-- 1 root root 152 Nov 9 2009 Makefile
-rwxr-xr-x 1 root root 1363192 Nov 23 2009 keyfile
-rwxrw-r-- 1 root root 1641 Nov 9 2009 keyfile.c
-rwxrw-r-- 1 root root 136 Nov 9 2009 myconf.ini
sh-3.2#

還有1.3M，差不多就只能這樣了。