c++ 读配置文件，libconfig – Records And Memorys

https://www.cnblogs.com/kex1n/p/6651258.html

此开源库需要自己下源文件并编译，作者提供了vs2008 的 sln , 本机 vs2012试过可编译

仿照做一个简单的读取配置文件程序

#include <stdio.h>
#include <stdlib.h>
#include <libconfig.h>


int main(int argc, char **argv)
{
  config_t cfg;
  config_setting_t *setting;
  const char *str;

  config_init(&cfg);

  /* Read the file. If there is an error, report it and exit. */
  if(! config_read_file(&cfg, "CTP_config.cfg"))
  {
    fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
            config_error_line(&cfg), config_error_text(&cfg));
    config_destroy(&cfg);
    return(EXIT_FAILURE);
  }

  setting = config_lookup(&cfg, "nickel");

  if(setting != NULL)
  {
	  const char *HeYun;
	  double JiDieSlope;
	  
	  if(config_setting_lookup_string(setting, "HeYun", &HeYun))
		printf("HeYun name: %s\n\n", HeYun);
	  else
		fprintf(stderr, "No 'HeYun' setting in configuration file.\n");


	  if(config_setting_lookup_float(setting, "JiDieSlope", &JiDieSlope))
		  printf("JiDieSlope: %6.2f\n\n", JiDieSlope);
	  else
		  fprintf(stderr, "No 'JiDieSlope' setting in configuration file.\n");


	  if(config_setting_lookup_float(setting, "JiDieInvalid", &JiDieSlope))
		  printf("JiDieInvalid: %6.2f\n\n", JiDieSlope);
	  else
		  fprintf(stderr, "No 'JiDieInvalid' setting in configuration file.\n");

	  if(config_setting_lookup_float(setting, "ErCiJiDieDownPoint", &JiDieSlope))
		  printf("ErCiJiDieDownPoint: %6.2f\n\n", JiDieSlope);
	  else
		  fprintf(stderr, "No 'ErCiJiDieDownPoint' setting in configuration file.\n");

	  if(config_setting_lookup_float(setting, "ZhiSun", &JiDieSlope))
		  printf("ZhiSun: %6.2f\n\n", JiDieSlope);
	  else
		  fprintf(stderr, "No 'ZhiSun' setting in configuration file.\n");




    putchar('\n');
  }


  config_destroy(&cfg);
  getchar();
  return(EXIT_SUCCESS);


}

#include <stdio.h>

#include <stdlib.h>

#include <libconfig.h>

int main(int argc, char **argv)

{

config_t cfg;

config_setting_t *setting;

const char *str;

config_init(&cfg);

/* Read the file. If there is an error, report it and exit. */

if(! config_read_file(&cfg, "CTP_config.cfg"))

{

fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),

config_error_line(&cfg), config_error_text(&cfg));

config_destroy(&cfg);

return(EXIT_FAILURE);

}

setting = config_lookup(&cfg, "nickel");

if(setting != NULL)

{

const char *HeYun;

double JiDieSlope;

if(config_setting_lookup_string(setting, "HeYun", &HeYun))

printf("HeYun name: %s\n\n", HeYun);

else

fprintf(stderr, "No 'HeYun' setting in configuration file.\n");

if(config_setting_lookup_float(setting, "JiDieSlope", &JiDieSlope))

printf("JiDieSlope: %6.2f\n\n", JiDieSlope);

else

fprintf(stderr, "No 'JiDieSlope' setting in configuration file.\n");

if(config_setting_lookup_float(setting, "JiDieInvalid", &JiDieSlope))

printf("JiDieInvalid: %6.2f\n\n", JiDieSlope);

else

fprintf(stderr, "No 'JiDieInvalid' setting in configuration file.\n");

if(config_setting_lookup_float(setting, "ErCiJiDieDownPoint", &JiDieSlope))

printf("ErCiJiDieDownPoint: %6.2f\n\n", JiDieSlope);

else

fprintf(stderr, "No 'ErCiJiDieDownPoint' setting in configuration file.\n");

if(config_setting_lookup_float(setting, "ZhiSun", &JiDieSlope))

printf("ZhiSun: %6.2f\n\n", JiDieSlope);

else

fprintf(stderr, "No 'ZhiSun' setting in configuration file.\n");

putchar('\n');

}

config_destroy(&cfg);

getchar();

return(EXIT_SUCCESS);

}

配置文件：

nickel =
{
  HeYun = "ni1910"; 
  JiDieSlope  = -2.0;
  JiDieInvalid  = 300.0;
  ErCiJiDieDownPoint = 100.0;
  ZhiSun  = 100.0;
};

nickel =

{

HeYun = "ni1910";

JiDieSlope = -2.0;

JiDieInvalid = 300.0;

ErCiJiDieDownPoint = 100.0;

ZhiSun = 100.0;

};

注意如果要 config_setting_lookup_float ，数值即使是整数，也写成带个小数点和0的形式。