错误如下：
[Linker error] undefined reference to `WSAStartup@8'
[Linker error] undefined reference to `socket@12'
[Linker error] undefined reference to `WSAStartup@8'
[Linker error] undefined reference to `socket@12'
[Linker error] undefined reference to `closesocket@4'
[Linker error] undefined reference to `htonl@4'
[Linker error] undefined reference to `htons@4'
[Linker error] undefined reference to `bind@12'
[Linker error] undefined reference to `listen@8'
[Linker error] undefined reference to `accept@12'
[Linker error] undefined reference to `socket@12'
[Linker error] undefined reference to `inet_addr@4'
[Linker error] undefined reference to `gethostbyname@4'
[Linker error] undefined reference to `htons@4'
[Linker error] undefined reference to `connect@12'
[Linker error] undefined reference to `send@16'
[Linker error] undefined reference to `recv@16'
ld returned 1 exit status
解决办法:
project->project options -> parameters, 在 linker框中输入 "-lwsock32" （注意:无引号）