winsock2

I have a C program that uses getaddrinfo() . It works as expected on Linux and Mac OS X. I'm in the middle of porting it to Windows. When I compile it (with MinGW gcc) I get the following warnings: ext/socket/socket.c: In function 'sl_tcp_socket_init': ext/socket/socket.c:98:5: warning implicit declaration of function 'getaddrinfo' [-Wimplicit-function-declaration] ext/socket/socket.c:104:9: warning implicit declaration of function 'freeaddrinfo' [-Wimplicit-function-declaration] Then the entire thing fails to link with undefined references to getaddrinfo() and freeaddrinfo() . Now, according

I am writing my program in Visual Studio 2010. I am unable to link a file named ws2_32.dll with my project. Can anyone tell me how I can do that? Typically you dont link to ws2_32.dll directly but to WS2_32.Lib, which you can find in the Windows SDK. So in your code you write #include <winsock2.h> and to your linker-settings you add WS2_32.Lib and you're good to go. The Windows SDK is here: http://msdn.microsoft.com/en-us/windows/bb980924.aspx The first order of business is importing the header file that defines functions exported by ws2_32.dll . You do that by adding the following statement

I’ve recently started learning IOCP on Windows and been reading the following article: http://www.codeproject.com/Tips/95363/Another-TCP-echo-server-using-IOCP You can download the sample for the article from: http://dl.dropbox.com/u/281215/documentation/iocp-1.00.html The sample contains two simple applications – iocp_echo_server and TcpEchoClient . I understand that IOCP is usually used on the server side of the client/server model but I’d like to create a client using IOCP. I’ve so far tried modifying the client sample above so that whenever the server sends a response to the client, it

My project uses windows.h in which winsock.h is used, and I need to include boost:assio which uses winsock2. So I get many errors that says Winsock.h already included. I can define WIN32_LEAN_AND_MEAN. so that windows.h wouldn't use winsock. The problem is , that I need windows.h to use it, and I just need Asio for asynchronous timers. I don't need its winsock2.h . I tried searching how to disable its winsock2 use, and I found that I could do that by defining BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN before including boost:asio, but I still get the same error. #include <windows.h> #define BOOST_ASIO

I've started writing an ActiveX control that makes use of sockets. Applications that use this control may or may not also use sockets. Is it possible for my control to tell whether WSAStartup has been called? If not, call it. A little test reveals that calling WSAStartup multiple times is tollerated. But what happens if a different winsock version is requested? will this break other parts of the application? Yes it is possible. And here is how it's done. bool WinsockInitialized() { SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (s == INVALID_SOCKET && WSAGetLastError() ==

Using Winsock2 the code sequence below returns -1 (failure) for select() . #include <Winsock2.h> #include <stdio.h> ... int rc; int fdstdin = fileno(stdin); /* returns 0 as expected */ fd_set fds; FD_ZERO(&fds); FD_SET(fdstdin, &fds); rc = select(1, &fds, NULL, NULL, NULL); ... Is this the expected behaviour when using Winsock2 or am I missing something? This is expected behavior. As mentioned all over the documentation , winsock's select function only works on sockets, and stdin is not a socket. If you had called WSAGetLastError , you undoubtedly would have found that the cause was