[RESOLVED] [2005] How to get around error 91

Hey folks, I've been working on adding a couple of search engines to my IE clone, but everytime i run the program, i always get this msg

Quote:

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Object reference not set to an instance of an object. Error Number: 91

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the documentation on .GetElementById and .InvokeMember is sketchy at best, i've tried msdn, this forum, google, and all the other tricks i know, can anyone help?

Here's my code

VB Code:

Private Sub doSearchQuery()
        Dim google As String = "http://www.google.com/search?hl=en&q=" 'Google's search engine string
        Dim yahoo As String = "http://search.yahoo.com/search;_ylt=A0geuoxASo1FZw4AFj2l87UF?ei=UTF-8&fr=sfp&p=" 'Yahoo's search engine string
        Dim googleId As String = "btnG"
        Dim Click As String = "click"
        'Dim helement As New HtmlElement
 
        Try
 
            If lbSearchSelect = "Google" Then
                wbPKMN.Navigate(google & SearchString) 'Navigate to google
                wbPKMN.Document.GetElementById("btnG").InvokeMember(Click)
 
            Else
                wbPKMN.Navigate(yahoo & SearchString) 'navigate to yahoo
                wbPKMN.Document.GetElementById("yschqcon").InvokeMember(Click)
            End If
        Catch ex As Exception
            nwWriteLogMsg(ex.Message, ".\nwpps2k6err.log", ex.StackTrace, ex.TargetSite.ToString, ex.Source, ex.HelpLink)
            With frmException
                .lblTitle.Text = "UriFormatException"
                .txtDesc.Text = ex.Message & " Error Number: " & Err.Number
                .lblSource.Text = ex.Source
                .lblTargetMethod.Text = ex.TargetSite.ToString
                .ctbSTrace.Text = ex.StackTrace
                .ShowDialog(Me)
            End With
        End Try
 
        LbSearch.Hide()
    End Sub

The funny thing about this is, it works, even though it's throwing that error everytime. Just wonder if there's a way around it

Redmo

try catch?

i'm already running a try, catch, i'll edit the code above to show the full routine, might give ye a better idea of what's goin on :D

Redmo

I think the problem is that you are not giving parameters to the click event... (such as sender and mousevents as e), to prevent these errors, you should probably move your click event code to a sub and call it instead of provoking a click....

:wave:

i'm not sure i fully understand, but when the user enters their query into the searchbox, both the keypress, and the go button fire of the doSearchQuery routine(the 1 above). I have nothing else in either of the other routines, except a check to make sure a search engine's selected.. :(

Redmo

Quote:

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Originally Posted by redmo

Hey folks, I've been working on adding a couple of search engines to my IE clone, but everytime i run the program, i always get this msg



the documentation on .GetElementById and .InvokeMember is sketchy at best, i've tried msdn, this forum, google, and all the other tricks i know, can anyone help?

Here's my code

VB Code:

Private Sub doSearchQuery()
        Dim google As String = "http://www.google.com/search?hl=en&q=" 'Google's search engine string
        Dim yahoo As String = "http://search.yahoo.com/search;_ylt=A0geuoxASo1FZw4AFj2l87UF?ei=UTF-8&fr=sfp&p=" 'Yahoo's search engine string
        Dim googleId As String = "btnG"
        Dim Click As String = "click"
        'Dim helement As New HtmlElement
 
        Try
 
            If lbSearchSelect = "Google" Then
                wbPKMN.Navigate(google & SearchString) 'Navigate to google
                wbPKMN.Document.GetElementById("btnG").InvokeMember(Click)
 
            Else
                wbPKMN.Navigate(yahoo & SearchString) 'navigate to yahoo
                wbPKMN.Document.GetElementById("yschqcon").InvokeMember(Click)
            End If
        Catch ex As Exception
            nwWriteLogMsg(ex.Message, ".\nwpps2k6err.log", ex.StackTrace, ex.TargetSite.ToString, ex.Source, ex.HelpLink)
            With frmException
                .lblTitle.Text = "UriFormatException"
                .txtDesc.Text = ex.Message & " Error Number: " & Err.Number
                .lblSource.Text = ex.Source
                .lblTargetMethod.Text = ex.TargetSite.ToString
                .ctbSTrace.Text = ex.StackTrace
                .ShowDialog(Me)
            End With
        End Try
 
        LbSearch.Hide()
    End Sub

The funny thing about this is, it works, even though it's throwing that error everytime. Just wonder if there's a way around it

Redmo

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Hi,

You could try something like this;

VB Code:

Dim Google As string =  Process.Start("www.google.com")

Hope it helps,

sparrow1

I kinda solved the problem by just not showing the user the exception msg generated. I know this is wrong, and i'm going to burn in hell, but what the hell, it works. I already know, HtmlElement is very poorly documented, anyone else know how to use it properly...

btw, system diagnostics.process, cannot be converted into a string.

Redmo