Windows network programming Error Error LNK2019

I was confused, because the code is copied from the book, and the code is unusually simple, the header files are introduced, but still show:

1> source. Obj:error LNK2019: unresolved external symbol [email protected], which is referenced in function _main
1> source. Obj:error LNK2019: unresolved external symbol [email protected], which is referenced in function _main
1> source. Obj:error LNK2019: unresolved external symbol [email protected], which is referenced in function _main

Later, I looked at a friend's blog to find two ways to solve the problem:

The first type:

Enter Ws2_32.lib below the menu project->settings, link, object/library modules and then OK

The second type:

Add the statement #pragma comment (lib, "Ws2_32.lib") to the header file to explicitly load. That

#include <winsock2.h>
#pragma comment (lib, "Ws2_32")

Windows network programming Error Error LNK2019