Can't write string of 1 and 0 to binary file, C++ -

i have function receives pointer string name of file open , code 1 , 0; codedline contains 010100110101110101010011 after writing binary file have same...would recommend? thank you.

    void codefile(char *s) {     char *buf = new char[maxstringlength];     std::ifstream filetocode(s);     std::ofstream codedfile("codedfile.txt", std::ios::binary);     if (!filetocode.is_open())         return;     while (filetocode.getline(buf, maxstringlength))     {         std::string codedline = codeline(buf);         codedfile.write(codedline.c_str(), codedline.size());     }     codedfile.close();     filetocode.close(); } 

after writing binary file have same...

i suppose want convert std::string input binary equivalent.

you can use std::bitset<> class convert strings binary values , vice versa. writing string directly file results in binary representations of character values '0' , '1'.

an example how use it:

std::string zeroes_and_ones = "1011100001111010010"; // define bitset can hold sizeof(unsigned long) bits std::bitset<sizeof(unsigned long) * 8> bits(zeroes_and_ones);  unsigned long binary_value = bits.to_ulong();  // write binary value file codedfile.write((const char*)&binary_value, sizeof(unsigned long)); 

note
above sample works c++11 standards. earlier version std::bitset can't initialized directly string. can filled using operator>>() , std::istringstream example.