MSXML2.XMLHTTP Gather Data
in [Visual Basic]
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From: Chuck on 22 Jun 2008 01:06 I'm using MSXML2.XMLHTTP to poll (every 6 seconds) a text file containing weather data from a NOAA site. All is working well except when that the file does not refresh to the most current one on the site. It is using the file in the cache. I tried to delete the file from the 'Temporary Internet Files' folder using 'Kill' but I get a 'file does not exist' error even though it's there (I can manually delete it using Windows Explorer) Is there a way to either delete this file or make sure my 'Get' code refreshes the file? Thanks Chuck
From: Jason Keats on 22 Jun 2008 02:12 Chuck wrote: > I'm using MSXML2.XMLHTTP to poll (every 6 seconds) a text file containing > weather data from a NOAA site. All is working well except when that the > file does not refresh to the most current one on the site. It is using the > file in the cache. I tried to delete the file from the 'Temporary Internet > Files' folder using 'Kill' but I get a 'file does not exist' error even > though it's there (I can manually delete it using Windows Explorer) > > Is there a way to either delete this file or make sure my 'Get' code > refreshes the file? > > Thanks > Chuck > > If you're using MSXML2.XMLHTTP via JavaScript/VBScript within a web page loaded into Internet Explorer (using Ajax-like calls) then I can see how the local IE cache may affect your results. In which case you could try changing IE's caching strategy from Automatic to "Check for newer versions of stored pages: Every time I visit the webpage". However, the appearance of your question in this group leads me to believe you're using VB6 - in which case I find it difficult to believe your page is being cached by IE (unless you've somehow cleverly caused this to be the case). The data could be cached by your company's proxy server (if there is such a thing), your ISP's cache (they sometimes have them), or the cache on the NOAA site (more likely) - in which case you're probably stuffed. HTH
From: Chuck on 22 Jun 2008 06:48 Thanks for the input Jason. I'm using simple VB6 code. Set obj = CreateObject("MSXML2.XMLHTTP") obj.open "GET", "http://weather.noaa.gov/pub/data/observations/metar/decoded/" & k & ".TXT", False obj.send strObj = obj.responseText Chuck > If you're using MSXML2.XMLHTTP via JavaScript/VBScript within a web page > loaded into Internet Explorer (using Ajax-like calls) then I can see how > the local IE cache may affect your results. In which case you could try > changing IE's caching strategy from Automatic to "Check for newer versions > of stored pages: Every time I visit the webpage". > > However, the appearance of your question in this group leads me to believe > you're using VB6 - in which case I find it difficult to believe your page > is being cached by IE (unless you've somehow cleverly caused this to be > the case). > > The data could be cached by your company's proxy server (if there is such > a thing), your ISP's cache (they sometimes have them), or the cache on the > NOAA site (more likely) - in which case you're probably stuffed. > > HTH
From: Chuck on 22 Jun 2008 08:13 One last observation, if I manually delete the temporary files in IE then my app applies the data from the current file. Is there a way to delete the temp files from within my app? I tried using delete files and kill but that doesn't work. Thanks. Chuck "Chuck" <astrocody(a)hotmail.com> wrote in message news:aNKdnUZi46V2sMPVnZ2dnUVZ_hzinZ2d(a)comcast.com... > Thanks for the input Jason. > > I'm using simple VB6 code. > > Set obj = CreateObject("MSXML2.XMLHTTP") > obj.open "GET", > "http://weather.noaa.gov/pub/data/observations/metar/decoded/" & k & > ".TXT", False > obj.send > strObj = obj.responseText > > Chuck > >> If you're using MSXML2.XMLHTTP via JavaScript/VBScript within a web page >> loaded into Internet Explorer (using Ajax-like calls) then I can see how >> the local IE cache may affect your results. In which case you could try >> changing IE's caching strategy from Automatic to "Check for newer >> versions of stored pages: Every time I visit the webpage". >> >> However, the appearance of your question in this group leads me to >> believe you're using VB6 - in which case I find it difficult to believe >> your page is being cached by IE (unless you've somehow cleverly caused >> this to be the case). >> >> The data could be cached by your company's proxy server (if there is such >> a thing), your ISP's cache (they sometimes have them), or the cache on >> the NOAA site (more likely) - in which case you're probably stuffed. >> >> HTH > >
From: Jason Keats on 22 Jun 2008 09:37
You're absolutely correct about IE caching the data. Thanks, I didn't know that. However, deleting the cache using code is going to be tough. I haven't yet found a way to it. The easiest way is to tick the advanced option in IE to "Empty Temporary Internet Files Folder when browser is closed". Then open and close IE! HTH Chuck wrote: > One last observation, if I manually delete the temporary files in IE then my > app applies the data from the current file. Is there a way to delete the > temp files from within my app? I tried using delete files and kill but that > doesn't work. Thanks. > > Chuck > > "Chuck" <astrocody(a)hotmail.com> wrote in message > news:aNKdnUZi46V2sMPVnZ2dnUVZ_hzinZ2d(a)comcast.com... >> Thanks for the input Jason. >> >> I'm using simple VB6 code. >> >> Set obj = CreateObject("MSXML2.XMLHTTP") >> obj.open "GET", >> "http://weather.noaa.gov/pub/data/observations/metar/decoded/" & k & >> ".TXT", False >> obj.send >> strObj = obj.responseText >> >> Chuck >> |