读取配置文件

LINUX下的配置文件，我很少去查看，现在也不记得是什么样子的了。在我的记忆里，还残留着古老的DOS下的配置文件格式，很简单：它是分段存储的，每段的段名用“[]”括起来，段名后跟的是属性名和属性值，两者用等号隔开，每条属性占据一行，整个文件是文本文件。

 

WINDOWS下是有专门的函数来读这样的配置文件的，貌似INI文件还沿用的这种格式。最近看一个家伙在LINUX下用C写这个东西，我也忍不住手痒，用C++写了一个。

 

头文件：

 // ConfigContext.h: interface for the CConfigContext class. // //【类的名称】: CConfigContext //【功 能】: 读取TXT类型的配置文件，格式遵循古老的DOS配置文件格式 //【异 常】: //【设 计】: 李云 //【注意事项】: 1.能自动删除两端冗余的空格，但不能删除跳格之类的字符 //【建立时间】: 1.2011年01月01日建立 // // #if !defined(AFX_CONFIGCONTEXT_H__856A6DD6_BC34_4D68_82F9_547EAB70DA23__INCLUDED_) #define AFX_CONFIGCONTEXT_H__856A6DD6_BC34_4D68_82F9_547EAB70DA23__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #pragma warning(disable : 4786) #include <fstream> #include <map> #include <iostream> #include <vector> #include <string> std::string& trim(std::string& myString, const std::string& myErase = " /t"); typedef struct tagCONFIG { std::string SegmentName; std::map< std::string, std::string > SegmentAttribs; }ConfigSegment; //文件段落节点 class CConfigContext { public: CConfigContext(); CConfigContext(const CConfigContext& Me){*this = Me;} CConfigContext(const std::string& Path){SetPath(Path);} virtual ~CConfigContext(); public: inline void SetPath(const std::string& Path){ConfigPath = Path; ReadFile(); AnalText();} bool GetAttr(const std::string& SegmentName, const std::string& AttribName, std::string& AttribValue); inline bool GetAttr(const std::string& AttribName, std::string& AttribValue){return GetAttr("", AttribName, AttribValue);} void DspData(); //仅供测试使用 CConfigContext& operator = (const CConfigContext& RightValue); public: std::vector< ConfigSegment > ContextData; //配置文件结构 protected: bool ReadFile(); bool AnalText(); private: std::string ConfigPath; //配置文件路径 std::vector< std::string > ContentData; //配置文件内容 }; #endif // !defined(AFX_CONFIGCONTEXT_H__856A6DD6_BC34_4D68_82F9_547EAB70DA23__INCLUDED_)

 

实现文件：

 // ConfigContext.cpp: implementation of the CConfigContext class. // // #include "ConfigContext.h" // // Construction/Destruction // CConfigContext::CConfigContext() { } CConfigContext::~CConfigContext() { } std::string& trim(std::string& myString, const std::string& myErase /* = " /t" */) { if(myString.empty())return myString; for(std::string::const_iterator siter = myErase.begin(); siter != myErase.end(); siter++) { myString.erase(0, myString.find_first_not_of(*siter)); myString.erase(myString.find_last_not_of(*siter) + 1); } return myString; } bool CConfigContext::ReadFile() { if(ConfigPath.empty())return false; std::ifstream InFile(ConfigPath.c_str()); if(!InFile.is_open()) return false; std::string TextLine; while(std::getline(InFile, TextLine)) { trim(TextLine); if(!TextLine.empty() && TextLine[0] != '#') //#开头的行，为注释行。 ContentData.push_back(trim(TextLine)); } return true; } bool CConfigContext::AnalText() { if(ContentData.empty())return false; ConfigSegment CfgSegment; std::string TagName; std::string TextString; std::string SegmentName; for(std::vector< std::string >::const_iterator viter = ContentData.begin(); viter != ContentData.end(); viter++) { std::string::size_type first_locat = viter->find_first_of('='); if(std::string::npos != first_locat) { TagName = viter->substr(0, first_locat); TextString = viter->substr(first_locat + 1); CfgSegment.SegmentAttribs[trim(TagName)] = trim(TextString); } else { std::string::size_type first_seg = viter->find_first_of('['); std::string::size_type last_seg = viter->find_first_of(']'); if(std::string::npos != first_seg && std::string::npos != last_seg) { if(!CfgSegment.SegmentAttribs.empty()) { ContextData.push_back(CfgSegment); CfgSegment.SegmentAttribs.clear(); } SegmentName = viter->substr(first_seg +1 , last_seg - 1); CfgSegment.SegmentName = trim(SegmentName); } } } if(!CfgSegment.SegmentAttribs.empty()) { ContextData.push_back(CfgSegment); CfgSegment.SegmentAttribs.clear(); } return true; } void CConfigContext::DspData() { for(std::vector< ConfigSegment >::const_iterator viter = ContextData.begin(); viter != ContextData.end(); viter++) { std::cout << "Segment Name: " << viter->SegmentName << std::endl; for(std::map< std::string, std::string >::const_iterator miter = viter->SegmentAttribs.begin(); miter != viter->SegmentAttribs.end(); miter++) { std::cout << "-->" << miter->first << "=" << miter->second << std::endl; } std::cout << std::endl; } } bool CConfigContext::GetAttr(const std::string& SegmentName, const std::string& AttribName, std::string& AttribValue) { for(std::vector< ConfigSegment >::const_iterator viter = ContextData.begin(); viter != ContextData.end(); viter++) { if(viter->SegmentName == SegmentName || SegmentName.empty()) { std::map< std::string, std::string >::const_iterator iter = viter->SegmentAttribs.find(AttribName); if(viter->SegmentAttribs.end() != iter) { AttribValue = iter->second; return true; } } } return false; } CConfigContext& CConfigContext::operator = (const CConfigContext& RightValue) { if(this == &RightValue)return *this; ConfigPath = RightValue.ConfigPath; ContentData = RightValue.ContentData; ContextData = RightValue.ContextData; return *this; }

 

经过测试，这段程序在VC++下和G++下都能通过编译