#include <windows.h>

#include "winsock.h"

char host_address[256];

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

                    PSTR szCmdLine, int iCmdShow)

{

       //WSAStartup函数返回的值

       int WSA_RETURN=36;

       WSADATA WsaData;

       HOSTENT *host_entry;

       char host_name[256];

       WSA_RETURN =WSAStartup(0x0201, &WsaData);

       //成功调用了WSAStartup函数

       if (WSA_RETURN==0)

       {

                     gethostname(host_name,256);

                     host_entry=gethostbyname(host_name);

              if(host_entry!=0)

              {

                     wsprintf(host_address,"%d.%d.%d.%d",

                                   (host_entry->h_addr_list[0][0]&0x00ff),

                                   (host_entry->h_addr_list[0][1]&0x00ff),

                                   (host_entry->h_addr_list[0][2]&0x00ff),

                                   (host_entry->h_addr_list[0][3]&0x00ff));

                     MessageBox(NULL,host_address,host_name,MB_OK);

              }

       }

       //MessageBox(NULL,host_name,host_address,MB_OK);

       WSACleanup();

       return 0 ;

}