未包含链接库文件ws2_32.lib导致的错误

VC6.0中错误描述：

Chat.obj : error LNK2001: unresolved external symbol
__imp__WSACleanup@0

Chat.obj : error LNK2001: unresolved external symbol
__imp__WSAStartup@8

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__closesocket@4

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__WSAAsyncSelect@16

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__bind@12

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__htonl@4

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__htons@4

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__WSASocketA@24

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__gethostbyaddr@12

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__WSARecvFrom@36

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__WSASendTo@36

ChatDlg.obj : error LNK2001: unresolved external symbol
__imp__gethostbyname@4

Release/Chat.exe : fatal error LNK1120: 12 unresolved externals

Error executing link.exe.

Chat.exe - 13 error(s), 0 warning(s)

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两种错误解决方法：

1.在 #include <winsock2.h>后面加上：

#pragma comment(lib, "ws2_32.lib")

2.依次打开Project->Setting->Link->Object/Library modules，在后面添加ws2_32.lib，注意前面要留空格！