Article ID: 174524
Article Last Modified on 2/10/2005
APPLIES TO
- Microsoft Visual FoxPro 3.0 Standard Edition
- Microsoft Visual FoxPro 3.0b Standard Edition
- Microsoft Visual FoxPro 5.0 Standard Edition
- Microsoft Visual FoxPro 5.0a
- Microsoft Visual FoxPro 6.0 Professional Edition
This article was previously published under Q174524
SUMMARY
The sample program below will connect to an Internet or intranet Web page and bring back the HTML code and store it into a memo field of a FoxPro table.
MORE INFORMATION
Save the sample program below into a Visual FoxPro program file. Use the following syntax to run the program:
DO readurl.prg WITH "http://www.microsoft.com"
Any Internet or intranet URL can be passed as a parameter. Microsoft.com was chosen for this example.
Note that Microsoft Internet Explorer must be installed on the computer.
* READURL.PRG - return the HTML for a specified URL in HURL.MEMO
*
* passed: URLName, in the form "http://www.microsoft.com"
*
* returns: length of HTML file
*
* usage:
*
* m.urllength = readurl("http://www.microsoft.com")
*
*
* notes:
* 1 - IE does not need to be running to use this, but must be installed,
* as the program uses an option that gets information from the registry
*
* 2 - the URL name apparently MUST be passed in the form shown above.
*
PARAMETERS UrlName
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)
IF NOT FILE("hurl.dbf")
CREATE TABLE hurl (MEMO M)
ELSE
USE hurl
ENDIF
APPEND BLANK
* what application is using Internet services?
sAgent = "VPF 5.0"
hInternetSession = InternetOpen(sAgent, INTERNET_OPEN_TYPE_PRECONFIG, ;
'', '', SYNCHRONOUS)
* debugging line - uncomment to see session handle
* WAIT WINDOW "Internet session handle: " + LTRIM(STR(hInternetSession))
IF hInternetSession = 0
WAIT WINDOW "Internet session cannot be established" TIME 2
RETURN 0
ENDIF
hUrlFile = InternetOpenUrl(hInternetSession, UrlName, '', ;
0, INTERNET_FLAG_RELOAD, 0)
* debugging line - uncomment to see URL handle
* WAIT WINDOW "URL Handle: " + LTRIM(STR(hUrlFile))
IF hUrlFile = 0
WAIT WINDOW "URL cannot be opened"
RETURN 0
ENDIF
DO WHILE .T.
* set aside a big buffer
sReadBuffer = SPACE(32767)
lBytesRead = 0
m.OK = InternetReadFile(hUrlFile, @sReadBuffer, ;
LEN(sReadBuffer), @lBytesRead)
* debugging code - uncomment if necessary
*WAIT WINDOW "hURLFile: " + LTRIM(STR(hURLFile)) + CR + ;
* "lBytesRead: " + LTRIM(STR(lBytesRead)) + CR ;
* + "m.OK : " + LTRIM(STR(m.OK))
REPLACE hurl.MEMO WITH sReadBuffer ADDITIVE
* uncomment to watch the changes to the memo file
* MODIFY MEMO hurl.memo
* error trap - either a read failure or read past eof()
IF m.OK = 0 OR lBytesRead = 0
EXIT
ENDIF
ENDDO
* close all the handles we opened
=InternetCloseHandle(hUrlFile)
=InternetCloseHandle(hInternetSession)
* return the number of bytes read
RETURN LEN(hurl.memo)
Keywords: kbhowto kbinetdev KB174524
