chrismalone
asked on
URL navigation - limited length in VB.net!!
i have this html page:
<form name=form1><input name=first_name><input name=username></form>
this vb.net code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.WebBrowser1.Navigate(Te
End Sub
End Class
when i type in this is the 'address bar' and navigate to it, it works:
javascript:var alphaNum = '0123456789ABCDEFGHIJKLMNO
but for some reason if i add another + alphaNum.charAt(Math.floor
is there a limit on the length you can navigate to a url in vb.net? is there a way to overcome it?
my other problem is trying to save an image thats inside a webbrowser control.. there doesn't seem to be a function for it... ?????
if anyone can solve either of these they'll get 250 points.
thanks.
<form name=form1><input name=first_name><input name=username></form>
this vb.net code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.WebBrowser1.Navigate(Te
End Sub
End Class
when i type in this is the 'address bar' and navigate to it, it works:
javascript:var alphaNum = '0123456789ABCDEFGHIJKLMNO
but for some reason if i add another + alphaNum.charAt(Math.floor
is there a limit on the length you can navigate to a url in vb.net? is there a way to overcome it?
my other problem is trying to save an image thats inside a webbrowser control.. there doesn't seem to be a function for it... ?????
if anyone can solve either of these they'll get 250 points.
thanks.
I tried your limited length problem both in VB.Net and directly in an IE browser. Same problem, but the string length is only 513, IE should be able to handle 2083 characters according to jensfiederers link.
ASKER
well its good to know people acknowledge it.. anyone have a solution?
p.s. vb_jonas.. thats weird, as somehow i was able add another few hundred of them and it still worked in ie6.. maybe its todo with the JS virtual machine..
p.s. vb_jonas.. thats weird, as somehow i was able add another few hundred of them and it still worked in ie6.. maybe its todo with the JS virtual machine..
You can set the html-objects with the webbrowser.document-proper
Me.WebBrowser1.Document.Al
With that technique you can access the image also.
Me.WebBrowser1.Document.Al
With that technique you can access the image also.
ASKER
how can i access the image?
it has no name or class in the html page, but i can get to it by index..
it has no name or class in the html page, but i can get to it by index..
ASKER
* and i had to solve the problem using domdocument similar to your one above. i would have rather insert external JS but it came to that..
ASKER
with the image, i think its possible to emulate an alt-print-screen of the form and crop it to the image.. but i'm uncertain..
if you can answer it, you can do it here or post in this one: https://www.experts-exchange.com/questions/21879244/Getting-picture-from-webpage-with-VB-net-250-points.html
currently the only way i can access it is: Me.WebBrowser1.Document.Im
to make it look like its a picturebox.. but i want to save Me.WebBrowser1.Document.Im
if you can answer it, you can do it here or post in this one: https://www.experts-exchange.com/questions/21879244/Getting-picture-from-webpage-with-VB-net-250-points.html
currently the only way i can access it is: Me.WebBrowser1.Document.Im
to make it look like its a picturebox.. but i want to save Me.WebBrowser1.Document.Im
ASKER
* the other way is if i can issue a clipboard copy command on Me.WebBrowser1.Document.Im
by selecting it automaticlly and 'pressing' Ctrl+C automaticlly..
by selecting it automaticlly and 'pressing' Ctrl+C automaticlly..
This seems worth trying:
Once you know the actual url of each image
(make sure not to process the same image multiple times), you can download it
from the web as a stream, and then do whatever you want with it, including
saving it to a local file. The nice thing about downloading the image from the
web is that, by default, it reuses the cache of Internet Explorer and thanks to
that won't really download images twice.
A general code for downloading a
resource like an image from the web is as follows :
<PRE>
HttpWebRequest h = (HttpWebRequest) WebRequest.Create("http://weblogs.asp.net/heatherleigh/contact.aspx");
StreamReader sr = new StreamReader( h.GetResponse().GetRespons
// sr.ReadToEnd(); for instance
// or create a filewriter and store the stream there
</PRE>
http://www.codeproject.com/jscript/htmlgetshooked.asp?df=100&forumid=4684&exp=0&select=774194#xx774194xx
Once you know the actual url of each image
(make sure not to process the same image multiple times), you can download it
from the web as a stream, and then do whatever you want with it, including
saving it to a local file. The nice thing about downloading the image from the
web is that, by default, it reuses the cache of Internet Explorer and thanks to
that won't really download images twice.
A general code for downloading a
resource like an image from the web is as follows :
<PRE>
HttpWebRequest h = (HttpWebRequest) WebRequest.Create("http://weblogs.asp.net/heatherleigh/contact.aspx");
StreamReader sr = new StreamReader( h.GetResponse().GetRespons
// sr.ReadToEnd(); for instance
// or create a filewriter and store the stream there
</PRE>
http://www.codeproject.com/jscript/htmlgetshooked.asp?df=100&forumid=4684&exp=0&select=774194#xx774194xx
I've made a sub that writes all images from a WebBrowser document and saves them locally, the thing is I'm not sure how it handles caching, so the images may or may not be requested once again here.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' Navigate to selected path:
Me.WebBrowser1.Navigate(Te
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
' Find and save images in htmlDocument
Dim HtmlElement As HtmlElement
Dim ImgFilename As String
Dim ImgSrc As String
Dim ImagesPath As String = "c:\images\"
' go through all images in the document
For Each HtmlElement In WebBrowser1.Document.GetEl
Dim objWReq As Net.WebRequest
Dim objWResp As Net.WebResponse
Dim strBuffer As String
'Contact the website
ImgSrc = HtmlElement.GetAttribute("
objWReq = Net.HttpWebRequest.Create(
ImgFilename = IO.Path.GetFileName(ImgSrc
objWResp = objWReq.GetResponse()
'Hopefully we get the cached image here, so that dynamically created images wont change and the app wont have problems with authentication, have to be tested though.
'Read the answer from the website and store it into a stream
Dim objStream As IO.Stream
objStream = objWResp.GetResponseStream
Dim inBuf(100000) As Byte
Dim bytesToRead As Integer = CInt(inBuf.Length)
Dim bytesRead As Integer = 0
While bytesToRead > 0
Dim n As Integer = objStream.Read(inBuf, bytesRead, bytesToRead)
If n = 0 Then
Exit While
End If
bytesRead += n
bytesToRead -= n
End While
Dim fstr As New IO.FileStream(ImagesPath & ImgFilename, IO.FileMode.OpenOrCreate, IO.FileAccess.Write)
fstr.Write(inBuf, 0, bytesRead)
objStream.Close()
fstr.Close()
objWResp.Close()
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' Navigate to selected path:
Me.WebBrowser1.Navigate(Te
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
' Find and save images in htmlDocument
Dim HtmlElement As HtmlElement
Dim ImgFilename As String
Dim ImgSrc As String
Dim ImagesPath As String = "c:\images\"
' go through all images in the document
For Each HtmlElement In WebBrowser1.Document.GetEl
Dim objWReq As Net.WebRequest
Dim objWResp As Net.WebResponse
Dim strBuffer As String
'Contact the website
ImgSrc = HtmlElement.GetAttribute("
objWReq = Net.HttpWebRequest.Create(
ImgFilename = IO.Path.GetFileName(ImgSrc
objWResp = objWReq.GetResponse()
'Hopefully we get the cached image here, so that dynamically created images wont change and the app wont have problems with authentication, have to be tested though.
'Read the answer from the website and store it into a stream
Dim objStream As IO.Stream
objStream = objWResp.GetResponseStream
Dim inBuf(100000) As Byte
Dim bytesToRead As Integer = CInt(inBuf.Length)
Dim bytesRead As Integer = 0
While bytesToRead > 0
Dim n As Integer = objStream.Read(inBuf, bytesRead, bytesToRead)
If n = 0 Then
Exit While
End If
bytesRead += n
bytesToRead -= n
End While
Dim fstr As New IO.FileStream(ImagesPath & ImgFilename, IO.FileMode.OpenOrCreate, IO.FileAccess.Write)
fstr.Write(inBuf, 0, bytesRead)
objStream.Close()
fstr.Close()
objWResp.Close()
Next
End Sub
ASKER
can you make it run without clicking a button please? you can just put in an example url and i'll change it..
i don't think it will work.. it has nocache attributes on it since its a captcha (verification image) and depends on cookies.
it would pretty much need the image already received.. if it could get it from the cache that would work .. but requesting it again probably wont (i've tried this way heaps)
and i've tried requesting the same image in a picturebox thats in the webbrowser control.. it just gets a different image and different cookies..
is there a way it can get the location of the internet cache path its currently working in? that could work maybe..
i don't think it will work.. it has nocache attributes on it since its a captcha (verification image) and depends on cookies.
it would pretty much need the image already received.. if it could get it from the cache that would work .. but requesting it again probably wont (i've tried this way heaps)
and i've tried requesting the same image in a picturebox thats in the webbrowser control.. it just gets a different image and different cookies..
is there a way it can get the location of the internet cache path its currently working in? that could work maybe..
Private Sub ParseForImages(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBr
... Paste Button2_Click-code here
End Sub
But the screen-capture way might be the best for you. https://www.experts-exchange.com/questions/21879244/Getting-picture-from-webpage-with-VB-net-250-points.html
... Paste Button2_Click-code here
End Sub
But the screen-capture way might be the best for you. https://www.experts-exchange.com/questions/21879244/Getting-picture-from-webpage-with-VB-net-250-points.html
ASKER
i would like this and all the other related threads deleted and refunded.
vb jonas started to help me with it on msn but got side-tracked with another project and i havent seen him on msn in a while.
vb jonas started to help me with it on msn but got side-tracked with another project and i havent seen him on msn in a while.
Hi again! Didnt the project I sent you work? Sorry, I thought it was ok.
ASKER
sorry, it didnt get finished either.
none of those two you sent worked :(
none of those two you sent worked :(
ASKER
and to netminder, the reason i asked him to do it over msn was because i didnt want my source code for the public to see and use.
This code is working (saving web page images) and I think it can be of use as a solution for the EE-readers:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' Navigate to selected path:
Me.WebBrowser1.Navigate(Te
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
' Find and save images in htmlDocument
Dim HtmlElement As HtmlElement
Dim ImgFilename As String
Dim ImgSrc As String
Dim ImagesPath As String = "c:\images\"
' go through all images in the document
For Each HtmlElement In WebBrowser1.Document.GetEl
Dim objWReq As Net.WebRequest
Dim objWResp As Net.WebResponse
Dim strBuffer As String
'Contact the website
ImgSrc = HtmlElement.GetAttribute("
objWReq = Net.HttpWebRequest.Create(
ImgFilename = IO.Path.GetFileName(ImgSrc
objWResp = objWReq.GetResponse()
'Hopefully we get the cached image here, so that dynamically created images wont change and the app wont have problems with authentication, have to be tested though.
'Read the answer from the website and store it into a stream
Dim objStream As IO.Stream
objStream = objWResp.GetResponseStream
Dim inBuf(100000) As Byte
Dim bytesToRead As Integer = CInt(inBuf.Length)
Dim bytesRead As Integer = 0
While bytesToRead > 0
Dim n As Integer = objStream.Read(inBuf, bytesRead, bytesToRead)
If n = 0 Then
Exit While
End If
bytesRead += n
bytesToRead -= n
End While
Dim fstr As New IO.FileStream(ImagesPath & ImgFilename, IO.FileMode.OpenOrCreate, IO.FileAccess.Write)
fstr.Write(inBuf, 0, bytesRead)
objStream.Close()
fstr.Close()
objWResp.Close()
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' Navigate to selected path:
Me.WebBrowser1.Navigate(Te
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
' Find and save images in htmlDocument
Dim HtmlElement As HtmlElement
Dim ImgFilename As String
Dim ImgSrc As String
Dim ImagesPath As String = "c:\images\"
' go through all images in the document
For Each HtmlElement In WebBrowser1.Document.GetEl
Dim objWReq As Net.WebRequest
Dim objWResp As Net.WebResponse
Dim strBuffer As String
'Contact the website
ImgSrc = HtmlElement.GetAttribute("
objWReq = Net.HttpWebRequest.Create(
ImgFilename = IO.Path.GetFileName(ImgSrc
objWResp = objWReq.GetResponse()
'Hopefully we get the cached image here, so that dynamically created images wont change and the app wont have problems with authentication, have to be tested though.
'Read the answer from the website and store it into a stream
Dim objStream As IO.Stream
objStream = objWResp.GetResponseStream
Dim inBuf(100000) As Byte
Dim bytesToRead As Integer = CInt(inBuf.Length)
Dim bytesRead As Integer = 0
While bytesToRead > 0
Dim n As Integer = objStream.Read(inBuf, bytesRead, bytesToRead)
If n = 0 Then
Exit While
End If
bytesRead += n
bytesToRead -= n
End While
Dim fstr As New IO.FileStream(ImagesPath & ImgFilename, IO.FileMode.OpenOrCreate, IO.FileAccess.Write)
fstr.Write(inBuf, 0, bytesRead)
objStream.Close()
fstr.Close()
objWResp.Close()
Next
End Sub
ASKER
yes, that code worked great on its own,
but wouldnt work in mine and you had to do some other project remember?
but wouldnt work in mine and you had to do some other project remember?
Yes, and I sent you the project file I got from you with my code added to your hotmail-address, but got no reply on that, so I thought it was ok.
ASKER CERTIFIED SOLUTION
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And the other question "Getting picture from webpage with VB.net" was deleted. This was something I put a lot of time into and came up with a general solution, which I really think the EE-readers can have great help with.
http://support.microsoft.com/default.aspx?scid=KB;en-us;q208427
I am not sure what you mean with the image saving.