字符串字符显示与16进制显示之间的相互转换

字符串字符显示与16进制显示之间的相互转换．

四个有用的函数：

//Function to convert unsigned char to string of length 2
void CXXX::Char2Hex(unsigned char ch, char* szHex)
{
unsigned char byte[2];
byte[0] = ch/16;
byte[1] = ch%16;
for(int 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;
}

//Function to convert string of length 2 to unsigned char
void CXXX::Hex2Char(char const* szHex, unsigned char& rch)
{
rch = 0;
for(int 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;
}
}

//Function to convert string of unsigned chars to string of chars
void CXXX::CharStr2HexStr(unsigned char const* pucCharStr, char* pszHexStr, int iSize)
{
int i;
char szHex[3];
pszHexStr[0] = 0;
for(i=0; i<iSize; i++)
{
Char2Hex(pucCharStr[i], szHex);
strcat(pszHexStr, szHex);
}
}

//Function to convert string of chars to string of unsigned chars
void CXXX::HexStr2CharStr(char const* pszHexStr, unsigned char* pucCharStr, int iSize)
{
int i;
unsigned char ch;
for(i=0; i<iSize; i++)
{
Hex2Char(pszHexStr+2*i, ch);
pucCharStr[i] = ch;
}
}