開發環境： vs2013， win10

經過很多次修改，和對一些錯誤的學習，才搞定了這麼一個類：

比如說LPCTSTR的賦值，new和delete要成對出現，字元陣列和字串的庫函式去取代自己寫字串處理函式等, wcsncpy_s用法，string類的賦值運算子等。

標頭檔案：

/*
	對文字的處理要求:'='號之前強制為整數,且只允許開頭後者結尾存在空格(處理後丟棄空格),不允許存在非數字字元,否則將丟棄該鍵值對
	=號右邊的value原樣儲存,包括空格的存在.
	對於讀取多個ini檔案,只要修改一下，就是在loadFile函式中不要對m_map進行clear

	已通過的測試樣例:
	1									=       abdfadfadfd
	======
	aaaaaa
	vvvv
	a
	123 + 234
	555=
	zzz=
	=dd
	=123
	=567=
	========
	a=1
	1234adfdd
*/
#pragma once
#include "stdafx.h"
#include<iostream>
#include<fstream>
#include<windows.h>
#include<string>
#include<map>
class QueryIni
{
public:
	QueryIni(){}
	~QueryIni(){}

public:
	/**
	* @brief 初始化成員變數指標
	* @return void
	*/
	static void Init();

	/**
	* @brief delete成員變數指標
	* @return void
	*/
	static void UnInit();

public:
	/**
	* @brief 查詢ini檔案中的鍵值,必須先呼叫SetPath,傳入路徑，再呼叫GetValue;
	* @param[in] const int iKey 要查詢的鍵
	* @return 查詢成功返回value字串,否則返回空字串
	*/
	static std::wstring QueryIni::GetValue(const int iKey)
	{
		wchar_t sDes[MAX_PATH + 1] = { 0 };
		QueryIni::_GetInstance()->_GetValue(iKey, sDes, MAX_PATH);	   //TRUE,得到查詢結果
		return sDes;
	}
	/**
	* @brief 讀取的檔案路徑
	* @param[in] LPCTSTR pFilePath 讀取的檔案的路徑
	* @return 是否成功載入檔案內的資料
	*/
	static bool LoadFile(LPCTSTR pFilePath);

	/**
	* @brief 清空map中的資料
	*/
	static void Clear();
private:
	static QueryIni* _GetInstance();
	bool QueryIni::_RemoveSpaceAndCheckNum(std::wstring &sKey);
	bool _GetValue(const int iKey, wchar_t* sDes, const int len);

private:
	std::map<int, std::wstring> m_map;
	static QueryIni* ms_pInstance;
};
 

#include"stdafx.h"
#include"QueryIni.h"
#include <iostream>  
#include <fstream>  
#include <string>  
#include <codecvt>
#include <locale>  
#include<assert.h>
using namespace std;
QueryIni* QueryIni::ms_pInstance = NULL;


void QueryIni::Init()
{
	if (ms_pInstance == NULL) 
	{
		ms_pInstance = new QueryIni();
	}
}

void QueryIni::UnInit()
{
	if (ms_pInstance != NULL) 
	{
		delete ms_pInstance;
		ms_pInstance = NULL;
	}
}

bool QueryIni::LoadFile(LPCTSTR pFilePath)
{
	QueryIni* queryIni = QueryIni::_GetInstance();
	if (pFilePath == NULL)
	{
		return false;
	}																	//這個不一定要哦!
	std::wifstream wFileStream(pFilePath, std::ios::binary);
	if (wFileStream.is_open())
	{
		wchar_t buf[2] = {0};
		wFileStream.read(buf, 2);
		wFileStream.clear();
		wFileStream.seekg(0, ios::beg);
		bool isUnicode =  (buf[0] == wchar_t(0xFF) && buf[1] == wchar_t(0xFE)) || (buf[0] == wchar_t(0xFE) && buf[1] == wchar_t(0xFF)) ;
		assert(isUnicode == true);
		// apply BOM-sensitive UTF-16 facet
		wFileStream.imbue(std::locale(wFileStream.getloc(), new std::codecvt_utf16 < wchar_t, 0x10ffff, std::consume_header >));//第二個引數是此平面將讀或寫而不出錯的wchar_t最大值
		std::wstring wLine;
		while (std::getline(wFileStream, wLine))
		{
			int equalPos = wLine.find_first_of(L'=');										//從pos開始查詢'='第一次出現的位置
			std::wstring sKey = L"", sValue = L"";
			if (equalPos != wstring::npos)										
			{
				sKey = wLine.substr(0, equalPos);
				sValue = wLine.substr(equalPos + 1, wLine.length() - equalPos);
				if (queryIni->_RemoveSpaceAndCheckNum(sKey))								//鍵合法,插入map
				{
					int iKey = stoi(sKey);
					queryIni->m_map.insert(make_pair(iKey, sValue));
				}
			}
		}
		wFileStream.close();																//開啟完檔案記得關閉
		return true;
	}
	return false;
}

void QueryIni::Clear()
{
	QueryIni::_GetInstance()->m_map.clear();
}

QueryIni* QueryIni::_GetInstance()
{
	if (ms_pInstance == NULL)
	{
		ms_pInstance = new QueryIni();
	}
	return ms_pInstance;
}

bool QueryIni::_RemoveSpaceAndCheckNum(std::wstring &sKey)
{
	sKey.erase(0, sKey.find_first_not_of(L" \t"));
	sKey.erase(sKey.find_last_not_of(L" \t") + 1);
	if (sKey == L"")	//這是個空字串
	{
		return false;
	}
	for (int i = 0; i < sKey.size(); i++)
	{
		if (sKey[i] > L'9' || sKey[i] < L'0')
		{
			return false;
		}
	}
	return true;
}

bool QueryIni::_GetValue(const int iKey, wchar_t* sDes, const int len)
{
	std::map<int, std::wstring>::iterator it = m_map.find(iKey);
	if (it == m_map.end())
	{
		return false;                             //不存在
	}
	else
	{
		std::wstring sValue = it->second;
		assert(sValue.length() < len);			//小心長度溢位
		wcsncpy_s(sDes, len, &(sValue[0]), sValue.length());
		return true;
	}
}


 

#include "stdafx.h"
#include<iostream>
#include<fstream>
#include<windows.h>
#include<string>
#include<map>
#include <codecvt>
#include"QueryIni.h"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
	QueryIni::Init();
	QueryIni::LoadFile(L"C:\\Users\\admin\\Desktop\\test2.ini");

	std::locale loc("chs");//windows下ok
	std::wcout.imbue(loc);
	std::wcout << QueryIni::GetValue(1) << std::endl;
	std::wcout << QueryIni::GetValue(100152) << std::endl;
	std::wcout << QueryIni::GetValue(102004) << std::endl;
	std::wcout << QueryIni::GetValue(102054) << std::endl;
	std::wcout << QueryIni::GetValue(100165) << std::endl;

	QueryIni::UnInit();
	{
	return 0;
}