问在C++中将字节字符串拆分为字节向量

EN

    std::istringstream iss("1,3,8,b,e,ff,10");
    std::vector<BYTE> dataValues;

    unsigned int num = 0; // read an unsigned int in 1st place
                          // BYTE is just a typedef for unsigned char
    while(iss >> std::hex >> num || !iss.eof()) {
        if(iss.fail()) {
            iss.clear();
            char dummy;
            iss >> dummy; // use char as dummy if no whitespaces 
                          // may occur as delimiters
            continue;
        }
        if(num <= 0xff) {
            dataValues.push_back(static_cast<BYTE>(num));
        }
        else {
            // Error single byte value expected
        }
    }

1
3
8
b
e
ff
10

#include <fstream>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <boost/lexical_cast.hpp>

int main(int argc, char* argv[]) {
    std::ifstream ifs("e:\\save.txt");

    std::string line;
    std::vector<std::string> tokens;
    std::getline(ifs, line);
    boost::split(tokens, line, boost::is_any_of(","));

    std::vector<unsigned char> values;
    for (const auto& t : tokens) {
        unsigned int x;
        std::stringstream ss;
        ss << std::hex << t;
        ss >> x;

        values.push_back(x);
    }

    for (auto v : values) {
        std::cout << std::hex << (unsigned long)v << std::endl;
    }

    return 0;
}

class ToHexIterator : public std::iterator<std::input_iterator_tag, int>{
    char* it_;
    char* end_;
    int current_;
    bool isHex(const char c){
        return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
    }
    char toUpperCase(const char c){
        if (c >= 'a' && c <= 'f'){
            return (c - 'a') + 'A';
        }
        return c;
    }
    int toNibble(const char c){
        auto x = toUpperCase(c);
        if (x >= '0' && x <= '9'){
            return x - '0';
        }
        else {
            return (x - 'A') + 10;
        }
    }
public:
    ToHexIterator() :it_{ nullptr }, end_{ nullptr }, current_{}{}                  //default constructed means end iterator
    ToHexIterator(char* begin, char* end) :it_{ begin }, end_{ end }, current_{}{
        while (!isHex(*it_) && it_ != end_){ ++it_; };  //make sure we are pointing to valid stuff
        ++(*this);
    }
    bool operator==(const ToHexIterator &other){
        return it_ == nullptr && end_ == nullptr && other.it_ == nullptr && other.end_ == nullptr;
    }
    bool operator!=(const ToHexIterator &other){
        return !(*this == other);
    }
    int operator*(){
        return current_;
    }
    ToHexIterator & operator++(){
        current_ = 0;
        if (it_ != end_) {
            while (isHex(*it_) && it_ != end_){
                current_ <<= 4;
                current_ += toNibble(*it_);
                ++it_;
            };
            while (!isHex(*it_) && it_ != end_){ ++it_; };
        }
        else {
            it_ = nullptr;
            end_ = nullptr;
        }
        return *this;
    }
    ToHexIterator operator++(int){
        ToHexIterator temp(*this);
        ++(*this);
        return temp;
    }
};

char in[] = "1,3,8,b,e,ff,10,--";
std::vector<int> v;
std::copy(ToHexIterator{ std::begin(in), std::end(in) }, ToHexIterator{}, std::back_inserter(v));