Just to make the conversion clear. Let’s say you have code using the deprecated inet_addr as in this example: RecvAddr.sin_addr.s_addr = inet_addr(“192.168.1.1”); It could be converted to the newer InetPton as follows: InetPton(AF_INET, _T(“192.168.1.1″), &RecvAddr.sin_addr.s_addr); The _T macro prevents the “const char incompatible with PCWSTR” error.
No. I have been bitten by this before. You may wonder how it can possibly fail, but you’ll run into issues of buffers of pending packets filling up, and consequently packets will be dropped. How the network subsystem drops packets is implementation-dependent and not specified anywhere.
wchar_t *s = NULL; FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, WSAGetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPWSTR)&s, 0, NULL); fprintf(stderr, “%S\n”, s); LocalFree(s);
An answer on StackOverflow made me think I have finally reached some glimpse of an understanding. Then I went testing for a bit and here’s the summary of a newbie’s view. Please correct me if I’m wrong because this is based on inference, not expertise. Shutdown Shutdown disables the Send and/or Receive methods, depending on … Read more
With UDP, you have to bind() the socket in the client because UDP is connectionless, so there is no other way for the stack to know which program to deliver datagrams to for a particular port. If you could recvfrom() without bind(), you’d essentially be asking the stack to give your program all UDP datagrams … Read more
Your question deserves a much longer discussion but here’s a short stab at an answer: using blocking sockets means that only one socket may be active at any time in any one thread (because it blocks while waiting for activity) using blocking sockets is generally easier than non-blocking sockets (asynchronous programming tends to be more … Read more
Put the -lws2_32 AFTER the list of object files – GCC searches libraries and object files in the order they appear on the command line. Just to help the other viewers out there: gcc hello.c -o hello.o -lws2_32
The best approach is to create an IPv6 server socket that can also accept IPv4 connections. To do so, create a regular IPv6 socket, turn off the socket option IPV6_V6ONLY, bind it to the “any” address, and start receiving. IPv4 addresses will be presented as IPv6 addresses, in the IPv4-mapped format. The major difference across … Read more