C ++将未终止的char *连接到std :: string

Question

What is a good way to convert an unterminated char* into a std::string? For example, upon completion of the following,

int bytes = recv(_socket, &_recv_buffer, recv_buffer_len, 0)

I have the address of the receive buffer, and the number of bytes it contains, and I want to concatenate it to a std::string . (FWIW, I'm not working with multibyte character sets.) The fallback would be to make the _recv_buffer one byte larger than recv_buffer_len , and set _recv_buffer[bytes] = '\\0' , but I wondered if there were a less sloppy way.

Answer 1

std::string has an append method that takes both a pointer to a string and a length:

string& append (const char* s, size_t n);

For you:

myString.append(_recv_buffer, bytes);

Editorial note: watch out for identifiers that start with _ . They're reserved for use by the implementation.

Answer 2

Use str.append(recv_buffer, bytes); which should do the trick.

Answer 3

std::string data(&_recv_buffer, &_recv_buffer + bytes);

And are you sure about the &_recv_buffer ? If your buffer is a char[] or something similiar it must be _recv_buffer .