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Open a Web Page in VFP
Message
From
07/04/2008 16:34:56
 
 
To
07/04/2008 15:45:01
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Environment versions
Visual FoxPro:
VFP 9 SP2
OS:
Windows 2000 SP4
Network:
Windows 2000 Server
Database:
MS SQL Server
Miscellaneous
Thread ID:
01308833
Message ID:
01308845
Views:
9
>Anyone have sample code that allows VFP to open up a web site and have the page contents as a string variable?
Function getdatafromurl
   Lparameters pcUrlName
   Declare Integer InternetOpen In wininet.Dll String sAgent, ;
      INTEGER lAccessType, String sProxyName, ;
      STRING sProxyBypass, Integer lFlags

   Declare Integer InternetOpenUrl In wininet.Dll ;
      INTEGER hInternetSession, String sUrl, String sHeaders,;
      INTEGER lHeadersLength, Integer lFlags, Integer lContext

   Declare Integer InternetReadFile In wininet.Dll Integer hfile, ;
      STRING @sBuffer, Integer lNumberofBytesToRead, Integer @lBytesRead

   Declare short InternetCloseHandle In wininet.Dll Integer hInst

   #Define INTERNET_OPEN_TYPE_PRECONFIG 0
   #Define INTERNET_OPEN_TYPE_DIRECT 1
   #Define INTERNET_OPEN_TYPE_PROXY 3
   #Define SYNCHRONOUS 0
   #Define INTERNET_FLAG_RELOAD 2147483648
   #Define CR Chr(13)

   Local lsAgent, lhInternetSession, lhUrlFile, llOk, lnOk, lcRetVal, lcReadBuffer, lnBytesRead

* what application is using Internet services?
   lsAgent = "VPF 5.0"

   lhInternetSession = InternetOpen( lsAgent, INTERNET_OPEN_TYPE_PRECONFIG, ;
      '', '', SYNCHRONOUS)

* debugging line - uncomment to see session handle
* WAIT WINDOW "Internet session handle: " + LTRIM(STR(hInternetSession))

   If lhInternetSession = 0
      Wait Window "Internet session cannot be established" Time 2
      Return .Null.
   Endif

   lhUrlFile = InternetOpenUrl( lhInternetSession, pcUrlName, '', 0, ;
      INTERNET_FLAG_RELOAD, 0)

* debugging line - uncomment to see URL handle
* WAIT WINDOW "URL Handle: " + LTRIM(STR(hUrlFile))

   If lhUrlFile = 0
      Wait Window "URL cannot be opened"
      Return .Null.
   Endif

   lcRetVal = ""
   llOk = .T.

   Do While llOk
* set aside a big buffer
      lsReadBuffer = Space(32767)
      lnBytesRead = 0
      lnOk = InternetReadFile( lhUrlFile, @lsReadBuffer, Len(lsReadBuffer), @lnBytesRead)

      If ( lnBytesRead > 0 )
         lcRetVal = lcRetVal + Left( lsReadBuffer, lnBytesRead )
      Endif

* error trap - either a read failure or read past eof()
      llOk = ( lnOk = 1 ) And ( lnBytesRead > 0 )
   Enddo

* close all the handles we opened
   InternetCloseHandle( lhUrlFile )
   InternetCloseHandle( lhInternetSession )
   Clear Dlls InternetOpen,InternetCloseHandle,InternetOpenUrl ,InternetReadFile
* return the URL contents
   Return lcRetVal
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