C ++通过套接字发送包含\\ 0的文件，而不会意外关闭

Question

I serialize the file via the code beneath, and send it over winsocks, this works fine with textfiles, but when I tried to send a jpg, the string contains \\0 as some of the character elements, so the sockets only send part of the string, thinking \\0 is the end, i was considering replacing \\0 with something else, but say i replace it with 'xx', then replace it back on the other end, what if the file had natural occurrences of 'xx' that get lost? Sure I could make a large, unlikely sequence, but that bloats the file.

Any help appreciated.

char* read_file(string path, int& len)
{
    std::ifstream infile(path);

    infile.seekg(0, infile.end);
    size_t length = infile.tellg();
    infile.seekg(0, infile.beg);
    len = length;
    char* buffer = new char[len]();

    infile.read(buffer, length);
    return buffer;
}

string load_to_buffer(string file)
{
    char* img;
    int ln;
    img = read_file(file, ln);
    string s = "";
    for (int i = 1; i <= ln; i++){
        char c = *(img + i);
        s += c;
    }
    return s;
}

Answer 1

Probably somewhere in your code (that isn't seen in the code you have posted) you use strlen() or std::string::length() to send the data, and/or you use std::string::c_str() to get the buffer. This results in truncated data because these functions stop at \\0.

std::string is not good to handle binary data. Use std::vector<char> instead, and remove the new[] stuff.