ini 配置文件使用方法

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文章链接： http://blog.csdn.net/youngpan1101/article/details/73773296
作者： 宋洋鹏（youngpan1101）
邮箱： [email protected]

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简介

• 一旦程序需要修改一些参数必须要修改程序代码本身并重新编译，为了让程序出厂后还能根据需要进行必要的配置，所以要用配置文件；
• 配置文件有很多种，如 INI 配置文件，XML 配置文件，cfg 配置文件，还有就是可以使用系统注册表等；
• INI 就是英文 “initialization” 的头三个字母的缩写；当然 INI file 的后缀名也不一定是 .ini 也可以是 .cfg，.conf 或者是 .txt。

运行 Demo

1. 下载 inifile.cpp 和 inifile.h 文件，复制到工程目录下的 3rdParty/inifile 文件夹里 【Download】
   

2. CMakeLists.txt

   cmake_minimum_required(VERSION 2.8)
   project( Sample )
   
    # produce lib
   SET(IniFileParse_CPP  ${PROJECT_SOURCE_DIR}/3rdParty/inifile/inifile.cpp)
   ADD_LIBRARY(IniFileParse  SHARED  ${IniFileParse_CPP})
   
   include_directories( ${PROJECT_SOURCE_DIR}/3rdParty )
   
   add_executable( main main.cpp )
   
   TARGET_LINK_LIBRARIES( main  IniFileParse )

3. main.cpp

    #include <iostream>
    #include <sstream>
   
    #include "inifile/inifile.h"
   
   //模板函数：将string类型变量转换为常用的数值类型（此方法具有普遍适用性）  
   template <class Type>  
   Type stringToNum(const std::string& str){  
       istringstream iss(str);  
       Type num;  
       iss >> num;  
       return num;      
   } 
   
   void getPara(const std::string& iniPath){
       std::cout << "load ini file to get parameters" << std::endl;
   
       inifile::IniFile ini;   
   
       int flag = ini.load(iniPath);
   
       int ret = 0;   // ret = 0 : succeed to get the parameter , otherwise -1 means fail
   
       int valTmp = ini.getIntValue("CameraID", "ID", ret);
       if(-1 == ret){
           std::cout << "can not get the CameraID from given ini file" << std::endl;
       }
       std::cout << "ret = " << ret << std::endl;
       std::cout << "valTmp = " << valTmp << std::endl;
   
       std::string strTmp = ini.getStringValue("Camera_Info", "SN", ret);
       if(-1 == ret){
           std::cout << "can not get the SN from given ini file" << std::endl;
       }
       std::cout << "ret = " << ret << std::endl;
       std::cout << "strTmp = " << strTmp << std::endl;
   
       double dValTmp = ini.getDoubleValue("Camera_Info", "image_width", ret);
       if(-1 == ret){
           std::cout << "can not get the image_width from given ini file" << std::endl;
       }
       std::cout << "ret = " << ret << std::endl;
       std::cout << "dValTmp = " << dValTmp << std::endl;
   
       // 2 x 4 Matrix 
       std::stringstream Matrix_1(ini.getStringValue("Camera_Info", "Matrix_row_1", ret));
       double num[4];
       for (int i = 0; i < 4; ++i)
       {
         std::string singleValueStr;
         getline(Matrix_1, singleValueStr, ',');
         num[i] = stringToNum<double>(singleValueStr);
       }
       std::cout << "num[0] = " << num[0] << " num[1] = " << num[1] << " num[2] = " << num[2] << " num[3] = " << num[3] << std::endl;
   
       std::stringstream Matrix_2(ini.getStringValue("Camera_Info", "Matrix_row_2", ret));
       for (int i = 0; i < 4; ++i)
       {
         std::string singleValueStr;
         getline(Matrix_2, singleValueStr, ',');
         num[i] = stringToNum<double>(singleValueStr);
       }
       std::cout << "num[0] = " << num[0] << " num[1] = " << num[1] << " num[2] = " << num[2] << " num[3] = " << num[3] << std::endl;
   }
   
   int main (int argc, char** argv){
       std::cout << "ini file parse..." << std::endl;
   
       std::string iniPath = "/home/hwj/Code/sample/para.ini";
   
       getPara(iniPath);
   
       return 1;
   }

4. para.ini

   [CameraID]
   ID=3      ; the id of camera used to get video stream
   
   [Camera_Info]
   SN=HW_987654321    ; serial number of camera
   image_width=640
   Matrix_row_1=1,2.34,5.4,5.5  
   Matrix_row_2=11,12.34,15.4,15.5

5. 编译运行

   $ cd build
   $ cmake ..
   $ make
   $ sudo ./main

Reference

• ini 配置文件格式