WinInet获取公网ip 

 1 #include<wininet.h>
 2 #pragma comment(lib,"wininet.lib")
 3  
 4 DWORD HttpGet(LPCTSTR, char *, int);
 5 void GetPublicIp(char *pIP, int len)
 6 {
 7     char szBuffer[1024];
 8     memset(szBuffer, 0, sizeof(char) * 1024);
 9     if (HttpGet(_TEXT("http://city.ip138.com/ip2city.asp"), szBuffer, 1024))
10     {
11         char* begin = strstr(szBuffer, "[");
12         char* end = strstr(begin, "]");
13         if (begin == NULL || end == NULL)
14             return;
15         int offset = end - begin - 1;
16         begin[offset] = '\0';
17         char *ip = begin;
18          
19         strncpy_s(pIP, len, ip, offset);      
20     }
21 }
22  
23 DWORD HttpGet(LPCTSTR lpszFullUrl, char *pBuffer, int iBufferSize)
24 {
25     if (lpszFullUrl == NULL)
26         return 0;
27  
28     HINTERNET hNet = ::InternetOpen(_TEXT("Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0"),
29         PRE_CONFIG_INTERNET_ACCESS,
30         NULL,
31         INTERNET_INVALID_PORT_NUMBER,
32         0);
33     if (hNet == NULL)
34     {
35         return 0;
36     }
37  
38     HINTERNET hUrlFile = ::InternetOpenUrl(hNet,
39         lpszFullUrl,
40         NULL,
41         0,
42         INTERNET_FLAG_RELOAD,
43         0);
44  
45     if (!hUrlFile)
46     {
47         return 0;
48     }
49  
50     ::memset(pBuffer, 0, iBufferSize);
51     DWORD dwBytesRead = 0;
52     char szTemp[1024] = { 0 };
53     DWORD dwTotalReadBytes = 0;
54     while (InternetReadFile(hUrlFile, szTemp, sizeof(szTemp) - 1, &dwBytesRead))
55     {
56         if (0 == dwBytesRead)
57             break;
58         szTemp[dwBytesRead] = 0; 
59  
60         // 缓冲区大小不够时，停止向目的缓冲区复制数据，跳出
61         if (dwTotalReadBytes + dwBytesRead >= (UINT)iBufferSize)
62         {
63             pBuffer[iBufferSize - 1] = 0;
64             break;
65         }
66  
67         strcat_s(pBuffer, 1024, szTemp);
68         ZeroMemory(szTemp, sizeof(szTemp));
69  
70         dwTotalReadBytes += dwBytesRead;
71  
72     }
73  
74     ::InternetCloseHandle(hUrlFile);
75     ::InternetCloseHandle(hNet);
76     return dwTotalReadBytes;
77 }
78  
79

 

posted on 2014-11-04 17:26  Dr.C  阅读(54)  评论(0)    收藏  举报