c++读取配置⽂件.ini⽂件
RrConfig.h
#ifndef RR_CONFIG_H_
#define RR_CONFIG_H_
#include <string>
#include <map>
class RrConfig
{
public:
RrConfig()
{
}
~RrConfig()
{
}
bool ReadConfig(const std::string & filename);
std::string ReadString(const char* section, const char* item, const char* default_value);
int ReadInt(const char* section, const char* item, const int& default_value);
float ReadFloat(const char* section, const char* item, const float& default_value);
private:
bool IsSpace(char c);
bool IsCommentChar(char c);
void Trim(std::string & str);
bool AnalyseLine(const std::string & line, std::string& section, std::string & key, std::string & value);
private:
//std::map<std::string, std::string> settings_;
std::map<std::string, std::map<std::string, std::string> >settings_;
};
class RrConfigMgr
{
protected:
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public:
static RrConfigMgr& GetInstance();
std::string ReadString(const char* section, const char* item, const char* default_value);
int ReadInt(const char* section, const char* item, const int& default_value);
float ReadFloat(const char* section, const char* item, const float& default_value);
virtual ~RrConfigMgr();
private:
static RrConfigMgr m_oInstance;
RrConfig config;
};
#endif
RrConfig.cpp
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#include "RrConfig.h"
#include <fstream>
#include <stdlib.h>
#ifdef _WIN32
#include <Windows.h>
#endif
bool RrConfig::IsSpace(char c)
{
if (' ' == c || '\t' == c)
return true;
return false;
}
bool RrConfig::IsCommentChar(char c)
{
switch (c) {
case '#':
return true;
default:
return false;
}
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}
void RrConfig::Trim(std::string & str)
{
if (pty())
{
return;
}
int i, start_pos, end_pos;
for (i = 0; i < str.size(); ++i) {
if (!IsSpace(str[i])) {
break;
}
}
if (i == str.size())
{
str = "";
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}
start_pos = i;
for (i = str.size() - 1; i >= 0; --i) {
if (!IsSpace(str[i])) {
break;
}
}
end_pos = i;
str = str.substr(start_pos, end_pos - start_pos + 1);
}
bool RrConfig::AnalyseLine(const std::string & line, std::string& section, std::string & key, std::string & value) {
if (pty())
return false;
int start_pos = 0, end_pos = line.size() - 1, pos, s_startpos, s_endpos;
if ((pos = line.find("#")) != -1)
{
if (0 == pos)
{
return false;
}
end_pos = pos - 1;
}
if (((s_startpos = line.find("[")) != -1) && ((s_endpos = line.find("]"))) != -1)
{
section = line.substr(s_startpos + 1, s_endpos - 1);
section = line.substr(s_startpos + 1, s_endpos - 1);
return true;
}
std::string new_line = line.substr(start_pos, start_pos + 1 - end_pos);
if ((pos = new_line.find('=')) == -1)
return false;
key = new_line.substr(0, pos);
value = new_line.substr(pos + 1, end_pos + 1 - (pos + 1));
Trim(key);
if (pty()) {
return false;
}
Trim(value);
if ((pos = value.find("\r")) > 0)
{
}
if ((pos = value.find("\n")) > 0)
{
}
return true;
}
bool RrConfig::ReadConfig(const std::string & filename)
{
settings_.clear();
std::ifstream infile(filename.c_str());
if (!infile) {
return false;
}
std::string line, key, value, section;
std::map<std::string, std::string> k_v;
std::map<std::string, std::map<std::string, std::string> >::iterator it;
while (getline(infile, line))
{
if (AnalyseLine(line, section, key, value))
{
it = settings_.find(section);
if (it != settings_.end())
{
k_v[key] = value;
it->second = k_v;
}
else
{
k_v.clear();
settings_.insert(std::make_pair(section, k_v));
}
}
key.clear();
value.clear();
}
infile.close();
return true;
}
std::string RrConfig::ReadString(const char* section, const char* item, const char* default_value) {
std::string tmp_s(section);
std::string tmp_i(item);
std::string def(default_value);
std::map<std::string, std::string> k_v;
std::map<std::string, std::string>::iterator it_item;
std::map<std::string, std::map<std::string, std::string> >::iterator it;
it = settings_.find(tmp_s);
it = settings_.find(tmp_s);
if (it == settings_.end())
{
return def;
}
k_v = it->second;
it_item = k_v.find(tmp_i);
if (it_item == d())
{
return def;
}
return it_item->second;
}
int RrConfig::ReadInt(const char* section, const char* item, const int& default_value)
{
std::string tmp_s(section);
std::string tmp_i(item);
std::map<std::string, std::string> k_v;
std::map<std::string, std::string>::iterator it_item;
std::map<std::string, std::map<std::string, std::string> >::iterator it;
it = settings_.find(tmp_s);
if (it == settings_.end())
{
return default_value;
}
k_v = it->second;
it_item = k_v.find(tmp_i);
if (it_item == d())
{
return default_value;
}
return atoi(it_item->second.c_str());
}
float RrConfig::ReadFloat(const char* section, const char* item, const float& default_value) {
std::string tmp_s(section);
std::string tmp_i(item);
std::map<std::string, std::string> k_v;
std::map<std::string, std::string>::iterator it_item;
std::map<std::string, std::map<std::string, std::string> >::iterator it;
it = settings_.find(tmp_s);
if (it == settings_.end())
{
return default_value;
}
k_v = it->second;
it_item = k_v.find(tmp_i);
if (it_item == d())
{
return default_value;
}
return atof(it_item->second.c_str());
}
std::string GetProgramDir()
{
#ifdef _WIN32
char exeFullPath[MAX_PATH] = { 0 }; // Full path
std::string strPath = "";
GetModuleFileNameA(NULL,exeFullPath, MAX_PATH);
读取配置文件失败strPath = (std::string)exeFullPath;    // Get full path of the file
int pos = strPath.find_last_of('\\', strPath.length());
return strPath.substr(0, pos);  // Return the directory without the file name
return strPath.substr(0, pos);  // Return the directory without the file name
#else
return "./";
#endif
}
RrConfigMgr RrConfigMgr::m_oInstance;
RrConfigMgr::RrConfigMgr()
{
std::string firstName = GetProgramDir();
std::string lastName = "config.ini";
std::string allName = firstName + "./" + lastName;
bool ret = config.ReadConfig(allName);
if (ret)
{
printf("ReadConfig config.ini succeed .. \n");
}
}
RrConfigMgr &RrConfigMgr::GetInstance()
{
return m_oInstance;
}
std::string RrConfigMgr::ReadString(const char * section, const char * item, const char * default_value) {
return config.ReadString(section, item, default_value);
}
int RrConfigMgr::ReadInt(const char * section, const char * item, const int & default_value)
{
return config.ReadInt(section, item, default_value);
}
float RrConfigMgr::ReadFloat(const char * section, const char * item, const float & default_value)
{
return config.ReadFloat(section, item, default_value);;
}
RrConfigMgr::~RrConfigMgr()
{
}
main.cpp
#include <stdio.h>
#include "RrConfig.h"
int main()
{
int port  = RrConfigMgr::GetInstance().ReadInt("MYSQL", "Port", 0);
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std::string HostName = RrConfigMgr::GetInstance().ReadString("MYSQL", "HostName", "");
float Scale = RrConfigMgr::GetInstance().ReadFloat("MYSQL", "Scale", 10.01);
printf("prot:%d HostName:%s Scale:%f .. \n", port, HostName.c_str(), Scale);
return 0;
}