AxWebBrowser problem!

  • Thread starter Thread starter Martin Ho
  • Start date Start date
M

Martin Ho

Hey Everyone,

I really hope there is someone who can figure out this problem.
Honestly, I spent 3 days now trying to find the solution, but nothing
works.

I'll try to explain the problem shortly, so I don't take too much of
your time.

Problem:
On the form I have AxWebBrowser box, and I load the page in it,
normally you would do it like this:

Dim finalurl as string = "http://www.mysite.com/example.php"
AxWebBrowser1.Navigate2(finalurl)

I set up a timer1 tick to go off every 10 minutes.
Example.php I am trying to load is a php script which comes up to have
different variables everytime you reload/refresh it.

In my case everytime I call the page, variables are the same. It never
refreshes it.

So I did my research and there was a suggestion to do this:

AxWebBrowser1.Refresh2(finalurl)
AxWebBrowser1.Navigate2(finalurl)


So I did another research and there was a suggestion to do this:

Dim finalurl as string = "http://www.mysite.com/example.php"
Dim REFRESH_COMPLETELY As Object = 3
AxWebBrowser1.Refresh2(REFRESH_COMPLETELY)
AxWebBrowser1.Navigate2(finalurl)

Well, this didn't work either.
So after another day of browsing Google, I found that someone
suggested to do this:

Private Enum BrowserNavConstants As Integer
navOpenInNewWindow = &H1
navNoHistory = &H2
navNoReadFromCache = &H4
navNoWriteToCache = &H8
navAllowAutosearch = &H10
navBrowserBar = &H20
navHyperlink = &H40
End Enum

and then call AxWebBrowser like this, so it is using property called:
navNoReadFromCache

AxWebBrowser1.Navigate2(finalurl,
BrowserNavConstants.navNoReadFromCache, Nothing, Nothing, Nothing)


Well, this doesn't work either and my application is not refreshing
the values, which I need to bring into the program.

Guys, I am really lost and I've got to the point of resignation. I
simly can't get it to work and no one can figure out how to do this.

Someone suggested to delete cookies and temporary cache files which
this php page is creating.
But that is not easy, location differs from pc to pc, and from
platform to platform and Ireally believe, that there should be some
other way of doing it.

Now, one valid point and that might be a help.
While application is running and refreshing values every 10 minutes,
NOTHING CHANGES, variables are still the same.
But if I open my Internet Explorer and go to the page (example.php),
it shows me updated values.
And my program as if someone used a magic stick, refreshes too.

So, what should I do? Is there any, and I mean any way, to refresh,
reload AxWebBrowser?
Any way to make it, so it doesn't read the page from cache?

Please, your help will be greatly appreciated.

Martin Ho.
 
Hi Martin,

The AxWebBrowser uses the same cache settings as IE does. Why it's
always reading from cache, I can't answer, but I can suggest an
alternative that does not rely on the AxWebBrowser. (It is worth noting
that the AxWebBrowser is buggy, always has been, always will be. One of
the reasons why the System.Net namespace has the
WebClient/WebResponse/WebClient classes).

If you insist on using the browser control, then what I would make sure
of is that your php page is set to expire immediately. Also, you should
set a pragma-no-cache meta tag to be on the safe side.

If you don't need the browser functionality (you had mentioned that you
were reading variables from the php page), I would recommend web page
scraping using the System.Net namespace. (I can't give code samples as I
am not a VB programmer):

http://www.codersource.net/csharp_screen_scraping.html
http://aspalliance.com/cookbook/ViewChapter.aspx?Chapter=21

Using this method, you are never going to cache and you don't have to
deal with ugly ActiveX controls.

HTH,
~d

Martin said:
Hey Everyone,

I really hope there is someone who can figure out this problem.
Honestly, I spent 3 days now trying to find the solution, but nothing
works.

I'll try to explain the problem shortly, so I don't take too much of
your time.

Problem:
On the form I have AxWebBrowser box, and I load the page in it,
normally you would do it like this:

Dim finalurl as string = "http://www.mysite.com/example.php"
AxWebBrowser1.Navigate2(finalurl)

I set up a timer1 tick to go off every 10 minutes.
Example.php I am trying to load is a php script which comes up to have
different variables everytime you reload/refresh it.

In my case everytime I call the page, variables are the same. It never
refreshes it.

So I did my research and there was a suggestion to do this:

AxWebBrowser1.Refresh2(finalurl)
AxWebBrowser1.Navigate2(finalurl)


So I did another research and there was a suggestion to do this:

Dim finalurl as string = "http://www.mysite.com/example.php"
Dim REFRESH_COMPLETELY As Object = 3
AxWebBrowser1.Refresh2(REFRESH_COMPLETELY)
AxWebBrowser1.Navigate2(finalurl)

Well, this didn't work either.
So after another day of browsing Google, I found that someone
suggested to do this:

Private Enum BrowserNavConstants As Integer
navOpenInNewWindow = &H1
navNoHistory = &H2
navNoReadFromCache = &H4
navNoWriteToCache = &H8
navAllowAutosearch = &H10
navBrowserBar = &H20
navHyperlink = &H40
End Enum

and then call AxWebBrowser like this, so it is using property called:
navNoReadFromCache

AxWebBrowser1.Navigate2(finalurl,
BrowserNavConstants.navNoReadFromCache, Nothing, Nothing, Nothing)


Well, this doesn't work either and my application is not refreshing
the values, which I need to bring into the program.

Guys, I am really lost and I've got to the point of resignation. I
simly can't get it to work and no one can figure out how to do this.

Someone suggested to delete cookies and temporary cache files which
this php page is creating.
But that is not easy, location differs from pc to pc, and from
platform to platform and Ireally believe, that there should be some
other way of doing it.

Now, one valid point and that might be a help.
While application is running and refreshing values every 10 minutes,
NOTHING CHANGES, variables are still the same.
But if I open my Internet Explorer and go to the page (example.php),
it shows me updated values.
And my program as if someone used a magic stick, refreshes too.

So, what should I do? Is there any, and I mean any way, to refresh,
reload AxWebBrowser?
Any way to make it, so it doesn't read the page from cache?

Please, your help will be greatly appreciated.

Martin Ho.
Click to expand...
 
D0tN3t said:
Hi Martin,

The AxWebBrowser uses the same cache settings as IE does. Why it's
always reading from cache, I can't answer, but I can suggest an
alternative that does not rely on the AxWebBrowser. (It is worth noting
that the AxWebBrowser is buggy, always has been, always will be. One of
the reasons why the System.Net namespace has the
WebClient/WebResponse/WebClient classes).

If you insist on using the browser control, then what I would make sure
of is that your php page is set to expire immediately. Also, you should
set a pragma-no-cache meta tag to be on the safe side.

If you don't need the browser functionality (you had mentioned that you
were reading variables from the php page), I would recommend web page
Click to expand...
scraping using the System.Net namespace. (I can't give code samples as I
am not a VB programmer):

http://www.codersource.net/csharp_screen_scraping.html
http://aspalliance.com/cookbook/ViewChapter.aspx?Chapter=21

Using this method, you are never going to cache and you don't have to
Click to expand...
deal with ugly ActiveX controls.

HTH,
~d
Click to expand...
 
I've ran into this thread as I was having the same issue.

My solution was to prevent the page itself fom being cached:

response.buffer = true
response.cacheControl = "no-cache"
response.addHeader "Pragma", "no-cache"
response.expires = -1
 
Try this

I had the same problems; I resolved now with:
WB.navigate complete_url, navNoWriteToCache
Try and tell me after.



Martin Ho said:
Hey Everyone,

I really hope there is someone who can figure out this problem.
Honestly, I spent 3 days now trying to find the solution, but nothing
works.

I'll try to explain the problem shortly, so I don't take too much of
your time.

Problem:
On the form I have AxWebBrowser box, and I load the page in it,
normally you would do it like this:

Dim finalurl as string = "http://www.mysite.com/example.php"
AxWebBrowser1.Navigate2(finalurl)

I set up a timer1 tick to go off every 10 minutes.
Example.php I am trying to load is a php script which comes up to have
different variables everytime you reload/refresh it.

In my case everytime I call the page, variables are the same. It never
refreshes it.

So I did my research and there was a suggestion to do this:

AxWebBrowser1.Refresh2(finalurl)
AxWebBrowser1.Navigate2(finalurl)


So I did another research and there was a suggestion to do this:

Dim finalurl as string = "http://www.mysite.com/example.php"
Dim REFRESH_COMPLETELY As Object = 3
AxWebBrowser1.Refresh2(REFRESH_COMPLETELY)
AxWebBrowser1.Navigate2(finalurl)

Well, this didn't work either.
So after another day of browsing Google, I found that someone
suggested to do this:

Private Enum BrowserNavConstants As Integer
navOpenInNewWindow = &H1
navNoHistory = &H2
navNoReadFromCache = &H4
navNoWriteToCache = &H8
navAllowAutosearch = &H10
navBrowserBar = &H20
navHyperlink = &H40
End Enum

and then call AxWebBrowser like this, so it is using property called:
navNoReadFromCache

AxWebBrowser1.Navigate2(finalurl,
BrowserNavConstants.navNoReadFromCache, Nothing, Nothing, Nothing)


Well, this doesn't work either and my application is not refreshing
the values, which I need to bring into the program.

Guys, I am really lost and I've got to the point of resignation. I
simly can't get it to work and no one can figure out how to do this.

Someone suggested to delete cookies and temporary cache files which
this php page is creating.
But that is not easy, location differs from pc to pc, and from
platform to platform and Ireally believe, that there should be some
other way of doing it.

Now, one valid point and that might be a help.
While application is running and refreshing values every 10 minutes,
NOTHING CHANGES, variables are still the same.
But if I open my Internet Explorer and go to the page (example.php),
it shows me updated values.
And my program as if someone used a magic stick, refreshes too.

So, what should I do? Is there any, and I mean any way, to refresh,
reload AxWebBrowser?
Any way to make it, so it doesn't read the page from cache?

Please, your help will be greatly appreciated.

Martin Ho.



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