Question

I have a hex string and want to convert this to a hex unsigned char array!

std::string hex = "0c45a1bf"

unsigned char hexCh = ""
    [0] = "0c"
    [1] = "45"
    [2] = "a1"
    [3] = "bf"

I want this bevavior shown in hexCh!

Best way over stringstream and std::hex? Have you an implementation?!

Thx

Answer 1

A possible solution: (thx Denis Ermolin):

void ClassA::FuncA(unsigned char *answer)
{
    std::string hex = "0c45a1bf";
    std::stringstream convertStream;

    // if you have something like "0c 45 a1 bf" -> delete blanks
    hex.erase( std::remove(hex.begin(), hex.end(), ' '), hex.end() );

    int offset = 0, i = 0;      
    while (offset < hex.length()) 
    {
        unsigned int buffer;

        convertStream << std::hex << hex.substr(offset, 2);         
        convertStream >> std::hex >> buffer;

        answer[i] = static_cast<unsigned char>(buffer);

        offset += 2;
        i++;

        // empty the stringstream
        convertStream.str(std::string());
        convertStream.clear();
    }
}