Thread: Unable to use in_addr type with arpa/inet.h

Whenever I do not include arpa/inet.h, this compiles fine in g++, but I cannot use some functions. The error in g++ is:

Code:

tcp.cpp:117: error: conversion from ‘in_addr_t’ to non-scalar type ‘in_addr’ requested

and line 117 is:

Code:

return((char *)inet_ntoa(addr.s_addr));

addr is defined as:

Code:

struct in_addr addr;

Originally Posted by Wolf`

Whenever I do not include arpa/inet.h, this compiles fine in g++, but I cannot use some functions. The error in g++ is:

Code:

tcp.cpp:117: error: conversion from ‘in_addr_t’ to non-scalar type ‘in_addr’ requested

and line 117 is:

Code:

return((char *)inet_ntoa(addr.s_addr));

addr is defined as:

Code:

struct in_addr addr;

Not sure if this is the answer but try aliasing your addr as (sockaddr)addr.s_addr and see if it works... in_addr and sockaddr are very similar but not always interchangeable.

When I do that, I get this:

Code:

tcp.cpp: In member function ‘char* tcpSocket::resolve(char*)’:
tcp.cpp:117: error: no matching function for call to ‘sockaddr::sockaddr(in_addr_t&)’
/usr/include/bits/socket.h:175: note: candidates are: sockaddr::sockaddr()
/usr/include/bits/socket.h:175: note:                 sockaddr::sockaddr(const sockaddr&)

Bummer...

I'm sure the others will have better answers than I did (as they so often do)...

inet_ntoa takes an in_addr as parameter, so you should be able to just pass "addr" without any problems.

Thanks a ton!