文字列からバイトデータに変換

byte2str.cpp

#include <iostream>
#include <stdexcept>
#include <sstream>
#include <string>
#include <vector>

typedef struct {
	std::string text;
	char delimiter;
} data_t;

std::vector<unsigned char> str2bytes(std::string &msg,  const char delimiter)
{
	std::vector<unsigned char> bytes;
	std::string text("");
	std::istringstream iss(msg);

	while(getline(iss, text, delimiter)) {
		std::istringstream tmp(text);
		unsigned int num;
		tmp >> std::hex >> num;
		bytes.push_back(num);
	}

	return bytes;
}

int main()
{
	std::vector<data_t> data;
	data.push_back({"1 a ff", ' '});
	data.push_back({"2,b,fe", ','});
	
	std::vector<data_t>::iterator itd;
	for(itd = data.begin(); itd != data.end(); ++itd) {
		std::vector<unsigned char> bytes = str2bytes(itd->text, itd->delimiter);
		
		std::vector<unsigned char>::iterator byte;
		for(byte = bytes.begin(); byte != bytes.end(); ++byte) {
			std::cout << ((int)*byte) << std::endl;
		}
	}
	
	return 0;
}