解析dbus参数

截取自 http://www.netmite.com/android/mydroid/external/dbus/tools/dbus-print-message.c

 

static void
print_iter (DBusMessageIter *iter, dbus_bool_t literal, int depth)
{
  do
    {
      int type = dbus_message_iter_get_arg_type (iter);

      if (type == DBUS_TYPE_INVALID)
	break;
      
      indent(depth);

      switch (type)
	{
	case DBUS_TYPE_STRING:
	  {
	    char *val;
	    dbus_message_iter_get_basic (iter, &val);
	    if (!literal)
	      printf ("string \"");
	    printf ("%s", val);
	    if (!literal)
	      printf ("\"\n");
	    break;
	  }

	case DBUS_TYPE_SIGNATURE:
	  {
	    char *val;
	    dbus_message_iter_get_basic (iter, &val);
	    if (!literal)
	      printf ("signature \"");
	    printf ("%s", val);
	    if (!literal)
	      printf ("\"\n");
	    break;
	  }

	case DBUS_TYPE_OBJECT_PATH:
	  {
	    char *val;
	    dbus_message_iter_get_basic (iter, &val);
	    if (!literal)
	      printf ("object path \"");
	    printf ("%s", val);
	    if (!literal)
	      printf ("\"\n");
	    break;
	  }

	case DBUS_TYPE_INT16:
	  {
	    dbus_int16_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("int16 %d\n", val);
	    break;
	  }

	case DBUS_TYPE_UINT16:
	  {
	    dbus_uint16_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("uint16 %u\n", val);
	    break;
	  }

	case DBUS_TYPE_INT32:
	  {
	    dbus_int32_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("int32 %d\n", val);
	    break;
	  }

	case DBUS_TYPE_UINT32:
	  {
	    dbus_uint32_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("uint32 %u\n", val);
	    break;
	  }

	case DBUS_TYPE_INT64:
	  {
	    dbus_int64_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("int64 %lld\n", val);
	    break;
	  }

	case DBUS_TYPE_UINT64:
	  {
	    dbus_uint64_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("uint64 %llu\n", val);
	    break;
	  }

	case DBUS_TYPE_DOUBLE:
	  {
	    double val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("double %g\n", val);
	    break;
	  }

	case DBUS_TYPE_BYTE:
	  {
	    unsigned char val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("byte %d\n", val);
	    break;
	  }

	case DBUS_TYPE_BOOLEAN:
	  {
	    dbus_bool_t val;
	    dbus_message_iter_get_basic (iter, &val);
	    printf ("boolean %s\n", val ? "true" : "false");
	    break;
	  }

	case DBUS_TYPE_VARIANT:
	  {
	    DBusMessageIter subiter;

	    dbus_message_iter_recurse (iter, &subiter);

	    printf ("variant ");
	    print_iter (&subiter, literal, depth+1);
	    break;
	  }
	case DBUS_TYPE_ARRAY:
	  {
	    int current_type;
	    DBusMessageIter subiter;

	    dbus_message_iter_recurse (iter, &subiter);

	    printf("array [\n");
	    while ((current_type = dbus_message_iter_get_arg_type (&subiter)) != DBUS_TYPE_INVALID)
	      {
		print_iter (&subiter, literal, depth+1);
		dbus_message_iter_next (&subiter);
		if (dbus_message_iter_get_arg_type (&subiter) != DBUS_TYPE_INVALID)
		  printf (",");
	      }
	    indent(depth);
	    printf("]\n");
	    break;
	  }
	case DBUS_TYPE_DICT_ENTRY:
	  {
	    DBusMessageIter subiter;

	    dbus_message_iter_recurse (iter, &subiter);

	    printf("dict entry(\n");
	    print_iter (&subiter, literal, depth+1);
	    dbus_message_iter_next (&subiter);
	    print_iter (&subiter, literal, depth+1);
	    indent(depth);
	    printf(")\n");
	    break;
	  }
	    
	case DBUS_TYPE_STRUCT:
	  {
	    int current_type;
	    DBusMessageIter subiter;

	    dbus_message_iter_recurse (iter, &subiter);

	    printf("struct {\n");
	    while ((current_type = dbus_message_iter_get_arg_type (&subiter)) != DBUS_TYPE_INVALID)
	      {
		print_iter (&subiter, literal, depth+1);
		dbus_message_iter_next (&subiter);
		if (dbus_message_iter_get_arg_type (&subiter) != DBUS_TYPE_INVALID)
		  printf (",");
	      }
	    indent(depth);
	    printf("}\n");
	    break;
	  }
	    
	default:
	  printf (" (dbus-monitor too dumb to decipher arg type '%c')\n", type);
	  break;
	}
    } while (dbus_message_iter_next (iter));
}