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inet.cpp
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Upload User: zexelpump
Upload Date: 2007-01-04
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Code Size: 3k
Category:

WEB(ASP,PHP,...)

Development Platform:

Visual C++

inet.cpp：Code Content
  1. /*
  2.     Simple wrapper class for checking validity of a URL
  3. */
  4. #include <windows.h>
  5. #include <io.h>
  6. #include "inet.h"
  9. WinInet::WinInet()
  10. {
  11.     m_hInternet = InternetOpen(NULL, INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
  12. }
  14. WinInet::~WinInet()
  15. {
  17.     if ( m_hInternet != NULL )
  18.     {
  19.         InternetCloseHandle(m_hInternet);
  20.         m_hInternet = NULL;
  21.     }
  23. }
  25. BOOL WinInet::CheckLink(LPCSTR pcszURL)
  26. {
  27.     BOOL    bFound = FALSE;
  28.     DWORD   dwErr;
  29.     char    szURLHostName[INTERNET_MAX_HOST_NAME_LENGTH];
  30.     char    szURLPath[INTERNET_MAX_URL_LENGTH];
  33.     if ( IsConnected() )
  34.     {
  35.         URL_COMPONENTS urlInfo = { sizeof(URL_COMPONENTS) };
  37.         urlInfo.lpszHostName = szURLHostName;
  38.         urlInfo.dwHostNameLength = INTERNET_MAX_HOST_NAME_LENGTH;
  39.         urlInfo.lpszUrlPath = szURLPath;
  40.         urlInfo.dwUrlPathLength = INTERNET_MAX_URL_LENGTH;
  43.         //could be changed to return NOT_A_URL, success or failure
  44.         if ( !InternetCrackUrl(pcszURL, 0, 0, &urlInfo) )
  45.             return FALSE;
  48.         if ( urlInfo.nScheme == INTERNET_SCHEME_HTTP )
  49.         {
  51.             HINTERNET hURL = InternetConnect(m_hInternet, szURLHostName, INTERNET_INVALID_PORT_NUMBER,
  52.                                "", "", INTERNET_SERVICE_HTTP, 0, 0);
  54.             if ( hURL )
  55.             {
  56.                 LPSTR szarrAcceptTypes[2] = { "*/*", NULL };
  58.                 DWORD  dwFlags = INTERNET_FLAG_RELOAD           | 
  59.                                  INTERNET_FLAG_NO_CACHE_WRITE   | 
  60.                                  INTERNET_FLAG_KEEP_CONNECTION;
  62.                 HINTERNET hRequest = HttpOpenRequest(hURL, "GET", szURLPath,
  63.                                                      HTTP_VERSION, "", (LPCSTR*)szarrAcceptTypes, dwFlags, 0);
  65.                 if ( hRequest )
  66.                 {
  67.                     BOOL b = HttpSendRequest(hRequest, NULL, 0, NULL,0);
  68.                     if ( b )
  69.                     {
  70.                         DWORD dwStatus = 0;
  71.                         DWORD dwLength = sizeof(DWORD);
  73.                         if ( HttpQueryInfo(hRequest, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, (PVOID)&dwStatus, &dwLength, NULL) )
  74.                             bFound = (dwStatus < HTTP_STATUS_AMBIGUOUS);
  75.                         else
  76.                             dwErr = GetLastError();
  78.                     }
  80.                     InternetCloseHandle(hRequest);
  81.                 }
  83.                 InternetCloseHandle(hURL);
  84.             }
  85.         }
  86.         else if ( urlInfo.nScheme == INTERNET_SCHEME_FTP )
  87.         {
  89.             HINTERNET hFTP = InternetConnect(m_hInternet, szURLHostName, INTERNET_DEFAULT_FTP_PORT,
  90.                                "", "", INTERNET_SERVICE_FTP, 0, 0);
  92.             if ( hFTP )
  93.             {
  94.                 HINTERNET hFile = FtpOpenFile(hFTP, szURLPath, GENERIC_READ, INTERNET_FLAG_RELOAD | FTP_TRANSFER_TYPE_BINARY, 0);
  96.                 if ( hFile )
  97.                 {
  98.                     bFound = TRUE;
  99.                     InternetCloseHandle(hFile);
  100.                 }
  102.                 InternetCloseHandle(hFTP);
  103.             }
  104.         }
  105.         else if ( urlInfo.nScheme == INTERNET_SCHEME_FILE )
  106.         {
  107.             // check if the file exists
  108.             bFound = (access(szURLPath, 0x00) == 0x00);
  109.         }
  110.         else
  111.         {
  112.             //unrecognized URL scheme
  113.         }
  115.     }
  117.     return bFound;
  118. }