1. #include <winsock2.h>

2. #include <iostream>

3. using namespace std;

4. #pragma comment(lib, "WS2_32.lib")

6. void getIP()

7. {

8. WSADATA WSAData; //WSADATA結構被用來儲存調用AfxSocketInit全局函數返回的Windows Sockets初始化信息。

9. if (WSAStartup(MAKEWORD(2, 0),&WSAData)) // 初始化Windows sockets API

10. {

11. printf("WSAStartup failed %s\n", WSAGetLastError());

12. exit(-1); //異常退出

13. }

15. char hostName[256];

16. if(gethostname(hostName,sizeof(hostName))) //獲取主機名

17. {

18. printf("Error: %u\n", WSAGetLastError());

19. exit(-1);

20. }

22. hostent *host=gethostbyname(hostName); // 根據主機名獲取主機信息(含IP)

23. if(host==NULL)

24. {

25. printf("Error: %u\n", WSAGetLastError());

26. exit(-1);

27. }

29. cout<<"正式的主機名: "<<host->h_name<<endl

30. <<"主機地址類型: "<<host->h_addrtype<<endl

31. <<"地址清單: "<<host->h_addr_list<<endl

32. <<"别名列表: "<<host->h_aliases<<endl

33. <<"地址長度: "<<host->h_length<<endl;

35. for(int i=0;host->h_addr_list[i]!=0;i )

36. {

37. cout<<"該主機IP"<<i 1<<": "<<inet_ntoa(*(struct in_addr*)*host->h_addr_list)<<endl;

38. }

39. WSACleanup();

40. }

42. int main()

43. {

44. getIP();

45. system("pause");

46. return 0;

47. }

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