boost::property_tree读取解析ini文件--推荐

boost::property_tree读取解析ini文件

#include "stdafx.h"
#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>

int main()
{
    boost::property_tree::ptree pt;
    boost::property_tree::ini_parser::read_ini("D:\Overlay.ini", pt);

    std::cout << pt.get<std::string>("OVERLAY.OverlayFontName") << std::endl;

    pt.put<std::string>("OVERLAY.OverlayFontName","宋体");

    std::cout << pt.get<std::string>("OVERLAY.OverlayFontName") << std::endl;

    boost::property_tree::ini_parser::write_ini("D:\Overlay.ini",pt);

    return 0;
}

在C++11下，宽字节和单字节转换就简单了。使用std::wstring_convert和std::codecvt_utf8 来处理UTF8与WChar之间的互转.

 #include <iostream>
#include <string>
#include <locale>
#include <codecvt>
#include <fstream>

int main(int argc, char *argv[])
{
   std::wstring str = L"123,宋体！";

   std::wstring_convert<std::codecvt_utf8<wchar_t>> conv;

   std::string narrowStr = conv.to_bytes(str);
   {
      std::ofstream ofs ("c:\test.txt");
      ofs << narrowStr;
   }

   std::wstring wideStr = conv.from_bytes(narrowStr);
   {
      std::locale::global(std::locale("Chinese-simplified"));
      std::wofstream ofs (L"c:\testW.txt");
      ofs << wideStr;
   }
｝

另外可以保存函数，使用ptree：

1 struct debug_simple
2 {
3     int itsNumber;
4     std::string itsName; //这里使用string就可以
5     void load(const std::string& filename); //载入函数
6     void save(const std::string& filename); //保存函数
7 };

保存函数，使用ptree：

 1 void debug_simple::save( const std::string& filename )
 2 {
 3     using boost::property_tree::ptree;
 4     ptree pt;
 5 
 6     pt.put("debug.number",itsNumber);
 7     pt.put("debug.name",itsName);
 8 
 9     write_xml(filename,pt);
10 }

载入函数使用的wptree，读取的值为wstring，需转换成string

 1 void debug_simple::load( const std::string& filename )
 2 {
 3     using boost::property_tree::wptree;
 4     wptree wpt;
 5     read_xml(filename, wpt);
 6 
 7     itsNumber = wpt.get<int>(L"debug.number");
 8     std::wstring wStr = wpt.get<std::wstring>(L"debug.name");
 9     itsName = std::string(wStr.begin(),wStr.end()); //wstring转string
10 }

main函数：

 1 int _tmain(int argc, _TCHAR* argv[])
 2 {
 3     
 4     try
 5     {
 6         debug_simple ds,read;
 7         ds.itsName = "汉字english";
 8         ds.itsNumber = 20;
 9 
10         ds.save("simple.xml");
11         read.load("simple.xml");
12 
13         std::cout<<read.itsNumber<<read.itsName;
14 
15     }
16     catch (std::exception &e)
17     {
18         std::cout << "Error: " << e.what() << "
";
19     }
20     return 0;
21 }

由于.ini文件是utf-8格式的，所以操作时要utf-8到unicode转换，或unicode到utf-8转换；

// PropertyTree.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
using namespace std;

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>

//unicode 转UTF8
//参数1是UTF8字符串当前位置指针，这里必须要是指针，因为必须要通过第1个字符进行判断才知道一个完整的字符的编码要向后取多少个字符
//参数2是返回的UCS-2编码的Unicode字符
inline int UTF82UnicodeOne(const char* utf8, wchar_t& wch)
{
    if (utf8==NULL)
    {
        return -1;
    }

    //首字符的Ascii码大于0xC0才需要向后判断，否则，就肯定是单个ANSI字符了
    unsigned char firstCh = utf8[0];
    if (firstCh >= 0xC0)
    {
        //根据首字符的高位判断这是几个字母的UTF8编码
        int afters, code;
        if ((firstCh & 0xE0) == 0xC0)
        {
            afters = 2;
            code = firstCh & 0x1F;
        }
        else if ((firstCh & 0xF0) == 0xE0)
        {
            afters = 3;
            code = firstCh & 0xF;
        }
        else if ((firstCh & 0xF8) == 0xF0)
        {
            afters = 4;
            code = firstCh & 0x7;
        }
        else if ((firstCh & 0xFC) == 0xF8)
        {
            afters = 5;
            code = firstCh & 0x3;
        }
        else if ((firstCh & 0xFE) == 0xFC)
        {
            afters = 6;
            code = firstCh & 0x1;
        }
        else
        {
            wch = firstCh;
            return 1;
        }

        //知道了字节数量之后，还需要向后检查一下，如果检查失败，就简单的认为此UTF8编码有问题，或者不是UTF8编码，于是当成一个ANSI来返回处理
        for(int k = 1; k < afters; ++ k)
        {
            if ((utf8[k] & 0xC0) != 0x80)
            {
                //判断失败，不符合UTF8编码的规则，直接当成一个ANSI字符返回
                wch = firstCh;
                return 1;
            }

            code <<= 6;
            code |= (unsigned char)utf8[k] & 0x3F;
        }

        wch = code;
        return afters;
    }
    else
    {
        wch = firstCh;
    }
    return 1;
}

//参数1是UTF8编码的字符串
//参数2是输出的UCS-2的Unicode字符串
//参数3是参数1字符串的长度
//使用的时候需要注意参数2所指向的内存块足够用。其实安全的办法是判断一下pUniBuf是否为NULL，如果为NULL则只统计输出长度不写pUniBuf，这样
//通过两次函数调用就可以计算出实际所需要的Unicode缓存输出长度。当然，更简单的思路是：无论如何转换，UTF8的字符数量不可能比Unicode少，所
//以可以简单的按照sizeof(wchar_t) * utf8Leng来分配pUniBuf的内存……
int UTF82Unicode(const char* utf8Buf, wchar_t *pUniBuf, int utf8Leng)
{

    if ((utf8Buf==NULL)||(pUniBuf==NULL))
    {
        return -1;
    }

    int i = 0, count = 0;
    while(i < utf8Leng)
    {
        i += UTF82UnicodeOne(utf8Buf + i, pUniBuf[count]);
        count ++;
    }

    return count;
}

inline int Unicode2UTF8One(unsigned wchar, char *utf8)
{

    if (utf8==NULL)
    {
        return -1;
    }

    int len = 0;
    if (wchar < 0xC0)
    {
        utf8[len ++] = (char)wchar;
    }
    else if (wchar < 0x800)
    {
        utf8[len ++] = 0xc0 | (wchar >> 6);
        utf8[len ++] = 0x80 | (wchar & 0x3f);
    }
    else if (wchar < 0x10000)
    {
        utf8[len ++] = 0xe0 | (wchar >> 12);
        utf8[len ++] = 0x80 | ((wchar >> 6) & 0x3f);
        utf8[len ++] = 0x80 | (wchar & 0x3f);
    }
    else if (wchar < 0x200000)
    {
        utf8[len ++] = 0xf0 | ((int)wchar >> 18);
        utf8[len ++] = 0x80 | ((wchar >> 12) & 0x3f);
        utf8[len ++] = 0x80 | ((wchar >> 6) & 0x3f);
        utf8[len ++] = 0x80 | (wchar & 0x3f);
    }
    else if (wchar < 0x4000000)
    {
        utf8[len ++] = 0xf8 | ((int)wchar >> 24);
        utf8[len ++] = 0x80 | ((wchar >> 18) & 0x3f);
        utf8[len ++] = 0x80 | ((wchar >> 12) & 0x3f);
        utf8[len ++] = 0x80 | ((wchar >> 6) & 0x3f);
        utf8[len ++] = 0x80 | (wchar & 0x3f);
    }
    else if (wchar < 0x80000000)
    {
        utf8[len ++] = 0xfc | ((int)wchar >> 30);
        utf8[len ++] = 0x80 | ((wchar >> 24) & 0x3f);
        utf8[len ++] = 0x80 | ((wchar >> 18) & 0x3f);
        utf8[len ++] = 0x80 | ((wchar >> 12) & 0x3f);
        utf8[len ++] = 0x80 | ((wchar >> 6) & 0x3f);
        utf8[len ++] = 0x80 | (wchar & 0x3f);
    }

    return len;
}

//
int Unicode2UTF8( const wchar_t *pUniBuf,char* utf8Buf, int UniLeng)
{
    if ((utf8Buf==NULL)||(pUniBuf==NULL))
    {
        return -1;
    }

    int count = 0, i = 0;
    while(i < UniLeng)
    {
        count += Unicode2UTF8One(pUniBuf[i], utf8Buf+count);
        i ++;
    }

    return count;
}

int main()
{
    boost::property_tree::ptree pt;
    using boost::property_tree::wptree;
    wptree wpt;

    boost::property_tree::ini_parser::read_ini("D:\Overlay.ini", pt);

    std::string fontName=pt.get<std::string>("OVERLAY.OverlayFontName") ;

    wchar_t wfontName[128]={0};

    UTF82Unicode(fontName.c_str(),wfontName,fontName.length());
    std::wstring  wstrfontName=wfontName;

    //std::wcout << wstrfontName.c_str()<< std::endl;

    /*std::wstring */
    wstrfontName=_T("我是谁");
    char cfontName[128]={0};

    Unicode2UTF8(wstrfontName.c_str(),cfontName,wstrfontName.length());

    pt.put<std::string>("OVERLAY.OverlayFontName",cfontName);

    //std::cout << pt.get<std::string>("OVERLAY.OverlayFontName") << std::endl;

    boost::property_tree::ini_parser::write_ini("D:\Overlay.ini",pt);

    return 0;
}