C语言十六进制数据同字符串的相互转换

#include "stdafx.h"

#include
#include
#include
#include

/*
入口参数：pSrc  源十六进制数据
出口参数：dest  存放运算结果
    返回：true  转换成功
          false 失败
*/
bool  Hex2String(unsigned  char  *pSrc,std::string &dest, int  nL)
{
    char  buf[256];

    memset((char  *)buf,0, sizeof (buf));

    unsigned char  hb;
    unsigned char  lb;

    for ( int  i=0;i
    {
        hb=(pSrc[i]&0xf0)>>4;

        if ( hb>=0 && hb<=9 )
            hb += 0x30;
        else   if ( hb>=10 &&hb <=15 )
            hb = hb -10 + 'A' ;
        else
            return   false ;

        lb = pSrc[i]&0x0f;
        if ( lb>=0 && lb<=9 )
            lb += 0x30;
        else   if ( lb>=10 && lb<=15 )
            lb = lb - 10 + 'A' ;
        else
            return   false ;

        buf[i*2]   = hb;
        buf[i*2+1] = lb;
    }
    dest = buf;
    return   true ;
}

/*
入口参数：src  源字符串
出口参数：dest  存放运算结果
    返回：true  转换成功
          false 失败
*/
bool  String2Hex(std::string &src,unsigned  char  *dest)
{
    unsigned char  hb;
    unsigned char  lb;

    if (src.size()%2!=0)
        return   false ;

    transform(src.begin(), src.end(), src.begin(), toupper);

    for ( int  i=0, j=0;i
    {
        hb=src[i];
        if ( hb>= 'A'  && hb<= 'F'  )
            hb = hb - 'A'  + 10;
        else   if ( hb>= '0'  && hb<= '9'  )
            hb = hb - '0' ;
        else
            return   false ;

        i++;
        lb=src[i];
        if ( lb>= 'A'  && lb<= 'F'  )
            lb = lb - 'A'  + 10;
        else   if ( lb>= '0'  && lb<= '9'  )
            lb = lb - '0' ;
        else
            return   false ;

        dest[j++]=(hb<<4)|(lb);
    }
    return   true ;
}

//下面是使用举例，在VisualStudio2008+SP1中调试通 过
int  _tmain( int  argc, _TCHAR* argv[])
{
    unsigned char  srcB[]={0x12,0x34,0x56,0x78,0x90,0xab,0xbc,0xcd,0xde,0xef};

    std::string strDest;

    Hex2String(srcB,strDest,sizeof (srcB));
    std::cout<<"HexToString:" <

    if (String2Hex(strDest,srcB))
        std::cout<<"StringToHex:Success!" <
    else
        std::cout<<"StringToHex:Failed!" <

    return  0;
}