C++ non null terminated char array outputting

Question

I was trying to output a not null terminated char array to a file.

Actual thing is, I am receiving packets and then printing their fields.

Now as these field

Answer 1

If you want to put exactly maxbytes bytes, use write method

stream.write(buffer, maxbytes);

If you can have less bytes in buffer, how do you know how many of them your buffer contains? If '\0' marks buffer end, you can write:

stream.write(buffer, std::find(buffer, buffer+maxbytes, '\0') - buffer);