1.libconfig官网下载路径 https://hyperrealm.github.io/libconfig/ 2.安装libconfig 安装过程：解压，配置，编译，安装 //解压安装包 tar -zxvf libconfig-1.7.2.tar.gz //安装前的引导配置，默认安装到/usr/local，可以通过./configure --prefix=PREFIX进行修改，也可以修改脚本参数ac_default_prefix的值 cd libconfig-1.7.2; ./configure //编译源码 make //安装前的检查 make check //安装 make install
复制库到/usr/lib cp /usr/local/lib/libconfig* /usr/lib
3.简单测试
配置文件用例example.cfg，内容如下： // An example configuration file that stores information about a store.// Basic store information: name = “Books, Movies & More”;
// Store inventory: inventory = { books = ( { title = “Treasure Island”; author = “Robert Louis Stevenson”; price = 29.99; qty = 5; }, { title = “Snow Crash”; author = “Neal Stephenson”; price = 9.99; qty = 8; } );
movies = ( { title = “Brazil”; media = “DVD”; price = 19.99; qty = 11; }, { title = “The City of Lost Children”; media = “DVD”; price = 18.99; qty = 5; }, { title = “Memento”; media = “Blu-Ray”; price = 24.99; qty = 20; }, { title = “Howard the Duck”; } ); };
// Store hours: hours = { mon = { open = 9; close = 18; }; tue = { open = 9; close = 18; }; wed = { open = 9; close = 18; }; thu = { open = 9; close = 18; }; fri = { open = 9; close = 20; }; sat = { open = 9; close = 20; }; sun = { open = 11; close = 16; }; };
2. 源文件example1.c，内容如下：
#include <stdio.h> #include <stdlib.h> #include <libconfig.h>
/* This example reads the configuration file ‘example.cfg’ and displays
some of its contents. */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, “example.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); }
/* Get the store name. 读取配置文件中的“Basic store information:”信息 */ if(config_lookup_string(&cfg, “name”, &str)) printf(“Store name: %s\n\n”, str); else fprintf(stderr, “No ‘name’ setting in configuration file.\n”);
if(config_lookup_string(&cfg, “hours”, &str)) printf(“Store hours: %s\n\n”, str); else fprintf(stderr, “No ‘hours’ setting in configuration file.\n”);
/* Output a list of all books in the inventory. */ setting = config_lookup(&cfg, “inventory.books”); if(setting != NULL) { int count = config_setting_length(setting); int i;
printf("%-30s %-30s %-6s %s\n", "TITLE", "AUTHOR", "PRICE", "QTY"); for(i = 0; i < count; ++i) { config_setting_t *book = config_setting_get_elem(setting, i); /* Only output the record if all of the expected fields are present. */ const char *title, *author; double price; int qty; if(!(config_setting_lookup_string(book, "title", &title) && config_setting_lookup_string(book, "author", &author) && config_setting_lookup_float(book, "price", &price) && config_setting_lookup_int(book, "qty", &qty))) continue; printf("%-30s %-30s $%6.2f %3d\n", title, author, price, qty); } putchar('\n');}
/* Output a list of all movies in the inventory. */ setting = config_lookup(&cfg, “inventory.movies”); if(setting != NULL) { unsigned int count = config_setting_length(setting); unsigned int i;
printf("%-30s %-10s %-6s %s\n", "TITLE", "MEDIA", "PRICE", "QTY"); for(i = 0; i < count; ++i) { config_setting_t *movie = config_setting_get_elem(setting, i); /* Only output the record if all of the expected fields are present. */ const char *title, *media; double price; int qty; if(!(config_setting_lookup_string(movie, "title", &title) && config_setting_lookup_string(movie, "media", &media) && config_setting_lookup_float(movie, "price", &price) && config_setting_lookup_int(movie, "qty", &qty))) continue; printf("%-30s %-10s $%6.2f %3d\n", title, media, price, qty); } putchar('\n');}
config_destroy(&cfg); return(EXIT_SUCCESS); }
/* eof */
