C++十六进制字符串与数组互转

#include 
#include 
#include 
#include 
#include 
#include 


std::string binToHex(const unsigned char *data,size_t size)
{
    std::ostringstream strHex;
    strHex << std::hex << std::setfill('0');
    for (size_t i = 0; i < size; ++i) {
        strHex << std::setw(2)<(data[i]);
    }
    return strHex.str();
}
 
std::vector hexToBin(const std::string &hex)
{
    std::vector dest;
    auto len = hex.size();
    dest.reserve(len / 2);
    for (decltype(len) i = 0; i < len; i += 2)
    {
        unsigned int element;
        std::istringstream strHex(hex.substr(i, 2));
        strHex >> std::hex >> element;
        dest.push_back(static_cast(element));
    }
    return dest;
}

int main(void)
{
    const char *strTest = "CED2CAC7B8F6B4F3D0DCC3A8";
    auto charVec = hexToBin(strTest);
    for (auto element : charVec) {
        std::cout << element;
    }
    std::cout << std::endl;
    auto strHex = binToHex(charVec.data(), charVec.size());
    std::cout << strHex << std::endl;
    system("pause");
    return 0;
}