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; 
}