C++实现字节数组与16进制字符串互转，字符串转16进制字符串
1、无符号字节数组转16进制字符串
std::string bytesToHexString(const BYTE* bytes,const int length)
{
if (bytes == NULL) {
return "";
}
std::string buff;
const int len = length;
for (int j = 0; j < len; j++) {
/*if ((bytes & 0xff) < 16) {
buff.append("0");
}*/
int high = bytes/16, low = bytes%16;
buff += (high<10) ? ('0' + high) : ('a' + high - 10);
buff += (low<10) ? ('0' + low) : ('a' + low - 10);
}
return buff;
}
2、16进制字符串转无符号字节数组
void hexToBytes(const std::string& hex,BYTE* bytes)
{
int bytelen = hex.length() / 2;
std::string strByte;
unsigned int n;
for (int i = 0; i < bytelen; i++)
{
strByte = hex.substr(i * 2, 2);
sscanf(strByte.c_str(),"%x",&n);
bytes = n;
}
}
字符串转16进制字符串
/*
* 将字符串编码成16进制数字,适用于所有字符（包括中文）
*/
std::string encodeHexString(const std::string& str) {
// 根据默认编码获取字节数组
std::string hexString = "0123456789abcdef";
string sb;
// 将字节数组中每个字节拆解成2位16进制整数
for (int i = 0; i < str.length(); i++) {
sb += hexString.at((str & 0xf0) >> 4);
sb += hexString.at((str & 0x0f) >> 0);
}
return sb;
}
16进制字符串转字符串
std::string hexStringToString(const std::string& hexStr)
{
std::string ret;
std::string hexString = "0123456789abcdef";
// 将每2位16进制整数组装成一个字节
for (int i = 0; i < hexStr.length(); i += 2)
ret += BYTE(hexString.find(hexStr.at(i)) << 4 | hexString.find(hexStr.at(i + 1)));
return ret;
}
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