THCommandStatus = ( 
  {
    Status = "1";
    index = 5;
  }, 
  {
    Status = "2";
    index = 8;
  }, 
  {
    Status = "3";
    index = 7;
  }, 
  {
    Status = "4";
    index = 0;
  } );

比如这是配置文件的内容，我要修改Status和index。

代码如下：

	config_t cfg;
	const char* value = nullptr;
	const char* cfg_data = nullptr;
	char					g_AnyProcessPath[256];
	config_init(&cfg);

	// Read the file. If there is an error, report it and exit. 
	if (!config_read_file(&cfg, cfg_filename)) {
		BLOG_DEBUG("can't open cfg file");
		return -1;
	}

	config_setting_t* Platform = config_lookup(&cfg, "THCommandStatus");
	int Platform_count = Platform ? config_setting_length(Platform) : 0;
	for (unsigned int i = 0; i < Platform_count; i++) {
		int TcpPort = 0;
		std::string StartRequest = "";
		std::string StopRequest = "";
		std::string HoldUri = "";
		config_setting_t* process_item = config_setting_get_elem(Platform, i);
		config_setting_t* Status_ = config_setting_get_member(process_item, "Status");
		config_setting_t* index_ = config_setting_get_member(process_item, "index");
		switch (i)
		{
		case 0:
			config_setting_set_string(Status_, "666");
			config_setting_set_int(index_, i);
			break;
		case 1:
			config_setting_set_string(Status_, "777");
			config_setting_set_int(index_, i);
			break;
		case 2:
			config_setting_set_string(Status_, "888");
			config_setting_set_int(index_, i);
			break;
		case 3:
			config_setting_set_string(Status_, "999");
			config_setting_set_int(index_, i);
			break;
		default:
			break;
		}
	}

	// 写入文件
	if (!config_write_file(&cfg, cfg_filename)) {
		BLOG_DEBUG(fmt::format("Error:{}", config_error_text(&cfg)));
	}

	config_destroy(&cfg); 

然后修改指定的参数之后，内容如下：

THCommandStatus = ( 
  {
    Status = "666";
    index = 0;
  }, 
  {
    Status = "777";
    index = 1;
  }, 
  {
    Status = "888";
    index = 2;
  }, 
  {
    Status = "999";
    index = 3;
  } );