C/C++ 十六进制char*与Binary char*相互转换

1. 十六进制char* 转 Binary char*

例如：“fedcba9876543210”
转换为：char bin[8] ={0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10}形式。
代码：

/*两个字符转换成一个字符，长度为原来的1/2*/static void Hex2Char(char *szHex, unsigned char *rch){    int i;    for(i=0; i<2; i++)    {        if(*(szHex + i) >='0' && *(szHex + i) <= '9')            *rch = (*rch << 4) + (*(szHex + i) - '0');        else if(*(szHex + i) >='a' && *(szHex + i) <= 'f')            *rch = (*rch << 4) + (*(szHex + i) - 'a' + 10);        else            break;    }}

/*十六进制char* 转 Binary char*函数*/void HexStr2CharStr( char *pszHexStr, int iSize,  char *pucCharStr){    int i;    unsigned char ch;    if (iSize%2 != 0) return;    for(i=0; i<iSize/2; i++)    {        Hex2Char(pszHexStr+2*i, &ch);        pucCharStr[i] = ch;    }}

2. Binary char* 转 十六进制char*

例如：char bin[8] ={0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10};
转换为：“fedcba9876543210”
代码：

/*单个字符转十六进制字符串，长度增大2被*/static void Char2Hex(unsigned char ch, char *szHex){    int i;    unsigned char byte[2];    byte[0] = ch/16;    byte[1] = ch%16;    for(i=0; i<2; i++)    {        if(byte[i] >= 0 && byte[i] <= 9)            szHex[i] = '0' + byte[i];        else            szHex[i] = 'a' + byte[i] - 10;    }    szHex[2] = 0;}

/*字符串转换函数，中间调用上面的函数*/void CharStr2HexStr( char *pucCharStr, int iSize,  char *pszHexStr){    int i;    char szHex[3];    pszHexStr[0] = 0;    for(i=0; i<iSize; i++)    {        Char2Hex(pucCharStr[i], szHex);        strcat(pszHexStr, szHex);    }}