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用的是boost1.46.1版本，这个版本的lexical库比1.36有改进，
float为：9 double：17；string类型的为：118 windows平台
函数集提供了精度的控制。可以按照要求输出小数点后固定格式的字符串。比如：125.000 (精确到小数点后3位)。
 #include <boost/lexical_cast.hpp>
#include <cmath>
#include <iomanip>
using boost::lexical_cast;
bool Double2MFCStr(double dValue, CString &str, int precision)
   {
 std::string stdStr = Double2String(dValue,precision);
str = StdStr2MFCStr(stdStr);
return true;
 }
bool MFCStr2Double(CString str, double &dValue)
{
std::string stdStr = MFCStr2StdStr(str);
try
  {
dValue = lexical_cast<double>(stdStr);
 }
catch (boost::bad_lexical_cast& e)
{
(e);
return false;
}
return true;
}
double String2Double(const char* ch)
{
double nInt = 0.0;
double nD = 0.0;
while(*ch&&*ch!='.')
{
nInt = nInt*10 + *ch - '0';
ch++;
}
if (*ch=='.')
{
ch++;
nD=0.1;
while(*ch)
{
nInt += (*ch - '0')*nD;
nD = nD/10;
ch++;
}
}
return nInt;
}
bool String2Double(const std::string &stdstr, double &dValue)
{
try
{
dValue = lexical_cast<double>(stdstr);
}
catch (boost::bad_lexical_cast& e)
{
(e);
return false;
}
return true;
}
bool String2Int(const std::string &stdstr, int &nValue)
{
try
{
nValue = (int)lexical_cast<double>(stdstr);
}
catch (boost::bad_lexical_cast& e)
{
(e);
return false;
}
return true;
}
std::string Int2String(int nValue)
{
std::string str = "";
try
{
str = lexical_cast<std::string>(nValue);
}
catch (boost::bad_lexical_cast& e)
{
(e);
}
return str;
}
std::string Int2String(int nValue,int precision)
{
std::string str = "";
std::stringstream ss;
ss << std::fixed << std::setprecision(precision);
ss << nValue;
int result;
ss >> result;
try
{
str = lexical_cast<std::string>(result);
}
catch (boost::bad_lexical_cast& e)
{
(e);
}
return str;
}
double Round(double dValue,int precision)
{
double minus = dValue>0?1.0:-1.0;
for (int i=0;i!=precision+1;i++)
{
minus = minus/10.0;
}
if ((fabs(dValue)-fabs(minus))<1e-6)
{
return 0;
}
double m = minus*5;
std::stringstream ss;
ss << std::fixed << std::setprecision(precision);
ss << dValue ;
double result;
ss >> result;
return result + m;
}
std::string Double2String(double dValue,int precision)
{
std::string str = "";
try
{
str = lexical_cast<std::string>(Round(dValue,precision));
size_t n = str.find('.');
if ( n == std::string::npos)
{
str.append(".");
for (int i=0;i!=precision;i++)
{
str.append("0");
}
}else
{
if ((str.size()> n+precision)) //后面至少还有decplaces位吗？
{
str[n+precision+1]='\0';//覆盖第一个多余的数
str.swap(std::string(str.c_str()));//删除nul之后的多余字符
}else
{
size_t size=str.size();
for (int i=0;i!=(n+precision+1-size);i++)
{
str.append("0");
}
}
}
}
catch (boost::bad_lexical_cast& e)
{
(e);
}
return str;
}
std::string MFCStr2StdStr(CString str)
{
std::string strStl;
#ifdef _UNICODE
CStringA stra(str.GetBuffer(0));
str.ReleaseBuffer();
strStl = stra.GetBuffer(0);
stra.ReleaseBuffer();
#else
strStl=str.GetBuffer(0);
#endif
return strStl;
}
CString StdStr2MFCStr(const std::string &stdstr)
{
//CString strMFC;
//strMFC = stdstr.c_str();
//return strMFC;
if (stdstr=="")
{
return CString();
}else
{
return CString(stdstr.c_str());
}
}
void Split(const CString& source,const CString& division,CStringArray& dest)
{
//CStringArray dest;
dest.RemoveAll();
int pos = 0;
int pre_pos = 0;
while( -1 != pos )
{
pre_pos = pos;
pos = source.Find(division,(pos+1));
dest.Add(source.Mid(pre_pos,(pos-pre_pos)));
}
}
char* MFCString2Char(CString str)
{
char * szText = new char[str.GetLength()+1] ;
WideCharToMultiByte(CP_ACP,0,str.GetBuffer(),-1,szText,MAX_PATH,NULL,NULL);
return szText;
}
errno_t Char2WChar_t(const char *pChar,wchar_t* pWchar)
{
if (pWchar==NULL)
{
return EINVAL;
}
// Convert to a wchar_t*
size_t origsize = strlen(pChar) + 1;
const size_t newsize = 1024;
size_t convertedChars = 0;
pWchar = new wchar_t[newsize];
return mbstowcs_s(&convertedChars, pWchar, origsize, pChar, _TRUNCATE);
}
void GetFileTitleFromFileName(CString fullPath,
CString& dirName,
CString& fileNameWithOutExt,
CString& ExtendName) //获取文件名和扩展名
{
int Where;
Where=fullPath.ReverseFind('\\');
if(Where==-1)
{
Where=fullPath.ReverseFind('/');
}
dirName = fullPath.Left(Where);
fileNameWithOutExt = fullPath.Right(fullPath.GetLength()-1-Where);
int Which=fileNameWithOutExt.ReverseFind('.');
ExtendName=fileNameWithOutExt.Right(fileNameWithOutExt.GetLength()-Which-1);
if (Which!=-1)
{
fileNameWithOutExt=fileNameWithOutExt.Left(Which);
}
}
/**//*
string to time_t
时间格式 2009-3-24
*/
int StringToTime(const std::string &strDateStr,time_t &timeData)
{
char *pBeginPos = (char*) strDateStr.c_str();
char *pPos = strstr(pBeginPos,"-");
if(pPos == NULL)
{
return -1;
}
int iYear = atoi(pBeginPos);
int iMonth = atoi(pPos + 1);
pPos = strstr(pPos + 1,"-");
if(pPos == NULL)
{
return -1;
}
int iDay = atoi(pPos + 1);
struct tm sourcedate;
memset((void*)&sourcedate,0,sizeof(sourcedate));
sourcedate.tm_mday = iDay;
sourcedate.tm_mon = iMonth - 1;
sourcedate.tm_year = iYear - 1900;
timeData = mktime(&sourcedate);
return 0;
}
/**//*
time_t to string
*/
int TimeToString(std::string &strDateStr,const time_t &timeData)
{
char chTmp[15];
memset(chTmp,0,sizeof(chTmp));
struct tm *p=NULL;
localtime_s(p,&timeData);
p->tm_year = p->tm_year + 1900;
p->tm_mon = p->tm_mon + 1;
sprintf_s(chTmp,sizeof(chTmp),"04d-%02d-%02d",
p->tm_year, p->tm_mon, p->tm_mday);
strDateStr = chTmp;
return 0;
}
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