Question

ref:c++ example code at bottom from http://msdn.microsoft.com/en-us/library/windows/desktop/ms740120(v=vs.85).aspx
I have a char array

char RecvBuf[1024];

which gets filled up on receiving UDP message.
How do I store it in a std::string variable like string str; so that I can return a string from my function?

Answer 1

Use this constructor of std::string:

string ( const char * s, size_t n );

Basically, if RecvBuf is a standard (text) “string”, it’s OK just to make

std::string str( RecvBuf );

but this will copy all chars, until \0 is hit.

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And as this buffer stores raw bytes, received from a socket, you should expect \0 bytes.

When you receive the data, you’ll know it’s size. So, just use

std::string str( RecvBuff, buff_len );