Visual Basic

19-Apr-09 0:52

Hi
I just need some help to refine some code I am writing inside the function above in Windows form, which includes a web browser control.

In my code so far I have written if msg.WParam = keys.controlkey then return true. Now this works fine, but what I am really trying to do is capture key combinations, like control & c. So, I changed it and said if msg.WParam = keys.controlkey And msg.WParam = keys.c then return true. Unfortunately, it is only capturing the control key, and if I change it to an OR then it only captures the c, which is not what I want.

Is there a quick way to get both at the same time? I am not looking for lots of complicated code, just something neat and simple.

Luc Pattyn19-Apr-09 1:17

Luc Pattyn

19-Apr-09 1:17

Hi,

msg.WParam cannot have two different values at the same time.

you can get the instantaneous value of the modifier keys through Control.ModifierKeys, so check that together with msg.WParam==(int)'c'

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

AndyASPVB19-Apr-09 2:25

19-Apr-09 2:25

Hi

Thanks for your reply.

But can you give me an example of some code, because I am unclear on how to piece it together.

Thanks

Luc Pattyn19-Apr-09 2:42

Luc Pattyn

19-Apr-09 2:42

I'd rather not. My VB isn't fluent and will confuse rather than help you.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Avoiding unwanted divs (as in "articles needing approval") with the help of this FireFox add-in

paas19-Apr-09 4:09

paas

19-Apr-09 4:09

If you are trying to capture the Ctrl Key plus an alpha char, like 'C', in ProcessCmdKey I believe the following will work:

If keyData = (Keys.Control + Keys.C) Then
   ' whatever
   Return True
End If

In this case the keyData parameter is handier than the message parameter.

AndyASPVB19-Apr-09 5:11

19-Apr-09 5:11

Hi
Thanks for your advice

I tried it and it skipped over the if statement. In debug mode I hovered over the keyData variable and its value was 131089, whereas keys.control was 131072 and C was 67. Therefore, it will never equate to true.

Also I noticed that won't work because the function is fired twice, which must be because there is two key strokes?

Does anyone have any ideas?

paas19-Apr-09 7:04

paas

19-Apr-09 7:04

AndyASPVB wrote:
Also I noticed that won't work because the function is fired twice, which must be because there is two key strokes?...

Have you tried running the code without stepping through the debugger? I believe ProcessCmdKey may fire twice under this scenario with the first firing showing keyData as the modifier key values summed (e.g., Keys.Control + Keys.ControlKey), and the second firing being, from my code example (Keys.Control + Keys.C).

At any rate, I know the sample I gave you works for me with VS 2003 or VS 2005 for capturing modifier key combinations in ProcessCmdKey (whether it be Alt or CTRL with another key). If it really is not working for you, I'm sorry I don't know why. I have not tried this under VS 2008 and, if that is what you are working under, maybe there is some slightly different behavior.

AndyASPVB19-Apr-09 10:33

19-Apr-09 10:33

Yes, I am working under VS 2008.

And what I wrote was in debugger mode and this is what was happening. When I switch off debugger, and just run it, nothing fires. I know nothing is firing because nested inside the if statement is a messagebox with a little message.

Could the type of machine the code is running have any influence?

XML: Writing and Parsing of HTML code

HowitZer2623-Jun-09 7:25

HowitZer26

23-Jun-09 7:25

Thanks this worked for me in c++ to be able to enabling panning with arrow keys. Holding ctrl at the same time enables micro panning.

DHalo18-Apr-09 17:26

DHalo

18-Apr-09 17:26

I've done a lot of research into this problem and I'm not exactly sure how to tie all I've found together into a cohesive app...

Here's my situation. I built a rather simple web app that has a textbox and a button. If you put HTML code in the box and click the button, it embeds the code into the page. Simple, right?

Well I had this idea that instead of just embedding the code into the page, it stored the code for later usage, like an RSS feed. Well...not like an RSS feed, A RSS feed.

But here's the deal, HTML doesn't store well in XML. There are multiple ways of doing so (like CDATA), but I'm not sure which is best for later retrieval and embedding.

Is someone willing to assist me in learning which methods are best for storing HTML code in an RSS feed and how to later parse and embed the code written to it?

Re: XML: Writing and Parsing of HTML code

Colin Angus Mackay19-Apr-09 1:11

Colin Angus Mackay

19-Apr-09 1:11

HttpUtility.HtmlEncode is probably what you are looking for.

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Voice Command Grammar Loading Error

p00m18-Apr-09 8:37

p00m

18-Apr-09 8:37

Hello everyone

I'm working on a large project wich involves voice command. I've made the basic things (dictation, commands hardcoded with general Grammar) however now i wanted to implement my custom grammar XML file but i keep getting an error. I've gone over almost all the tutorials and scripts i could find on the matter (2 days of nearly non-stop research). So i finaly desided to post here for help.

I'm getting the "ComException was unhandled - Exception from HRESULT: 0x80046052" error on the following code:

Grammar.CmdLoadFromFile("C:\Grammar.xml", SpeechLoadOption.SLOStatic)

Here is a scaled down version of the problem:

Imports System
Imports System.Data
Imports System.Deployment
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Xml

Imports SpeechLib

Public Class Form2
Dim WithEvents RecoContext As SpSharedRecoContext
Dim Grammar As ISpeechRecoGrammar

Private Sub initialize()
        If RecoContext Is Nothing Then
            RecoContext = New SpSharedRecoContext
            Grammar = RecoContext.CreateGrammar(1)
            Grammar.CmdLoadFromFile("c:\Grammar.xml", SpeechLoadOption.SLOStatic)  'Error here
            Grammar.DictationSetState(SpeechRuleState.SGDSInactive)
            Grammar.CmdSetRuleIdState(1, SpeechRuleState.SGDSActive)
        End If
End Sub

Private Sub btnInit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnInit.Click
        initialize()
    End Sub

End Class

Any help would be appreciated!

Thanks in advance

p00m

Re: Voice Command Grammar Loading Error

Johan Hakkesteegt21-Apr-09 21:32

Johan Hakkesteegt

21-Apr-09 21:32

I admit that this is just a bit of a wild guess, but I have had some very remotely similar problems when reading from XML files.

Considering the line of code where you have the error happening, and it then claiming that it is unhandled, suggests to me that the error is not actually happening in that line of code itself, but in the code that you are calling with the CmdLoadFromFile method.

In my case, after lots of research and hair pulling, I found that it all came down to some field in the xml file containing a naughty character like / or ' or & or <, etc. These characters would throw of the xml reader, and therefore cause an error in the code that called the reader.

My advice is free, and you may get what you paid for.

Need help on Visual basic 2008 Express (Microsoft Access Database)

helen0018-Apr-09 7:27

helen00

18-Apr-09 7:27

Hi,

I have created a Access Table database. In the Visual Basic 2008 Express, i have created a windows form and i put datagridview into this form. The datagridview is bind to the database.

I want to select multiple cells in the table (shown in datagridview) and then copy these multiple cells' data into a text file.

Can anybody advise me the sample code to do this? Thanks.

Re: Need help on Visual basic 2008 Express (Microsoft Access Database)

Henry Minute18-Apr-09 8:55

Henry Minute

18-Apr-09 8:55

Take a look at the DataGridView.MultiSelect and/or the DataGridView.SelectMode properties.

That should help with the first part.

Then look at the DataGridView.SelectedCells property. This returns a collection of cells, all you have to do is work out how to iterate through the collection. I'll leave you to work that bit out.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Browser Activity

AndyASPVB18-Apr-09 5:00

18-Apr-09 5:00

Hi

I have built my own web browser in Visual Studio 2008, and what I would like to do is to close the browser if there is no activity.

How do you do this? Do you have to detect whether there is any key press or mouse movement, and then close?

Can someone please help me.

Thanks

Re: Browser Activity

Eddy Vluggen18-Apr-09 22:48

Eddy Vluggen

18-Apr-09 22:48

AndyASPVB wrote:
Do you have to detect whether there is any key press or mouse movement, and then close?

Yup. Put a timestamp on the last activity (meaning that each keypress and mousemove cause an update of that variable) and use the Application.Idle event to check whether there has been any activity between (Now - timestamp).

Alternatively, you could write a screensaver that simple loops all active processes and kills the browser Smile | :)

I are troll Smile | :)

Disable some hot keys

AndyASPVB18-Apr-09 4:57

18-Apr-09 4:57

Hi Everyone

I am looking if someone can give me some guidance.

Can someone explain to me how I can disable some hot keys, because the application I am building needs to be fairly secure. The keys I am looking to switch off are

1) Ctrl & C
2) Ctrl & X
3) Print Screen
4) Delete

They only need to be turned off for the duration of when the application is running.

How do you do this?

Thanks

Zaegra18-Apr-09 5:36

Zaegra

18-Apr-09 5:36

Try taking a look at Global Windows Hooks[^]
When the corresponding key combinations are pressed, use e.Handled = True. Do read the article before using, so that you know what you're doing Big Grin | :-D

Greets,
Zaegra

Motivation is the key to software development.

Eddy Vluggen18-Apr-09 6:57

Eddy Vluggen

18-Apr-09 6:57

AndyASPVB wrote:
4) Delete

What's unsafe about the delete button? Confused | :confused:

I are troll Smile | :)

Mycroft Holmes18-Apr-09 17:22

Mycroft Holmes

18-Apr-09 17:22

AndyASPVB wrote:
3) Print Screen

How are you going to deal with a screen capture utility?
What happens if someone has a custom mapped keyboard?

If someone is serious about snaffling your screens and text data, you are not going to stop them with this type of fix, you only get the casual users and annoy them into using more advanced tools if it is important to them.

Never underestimate the power of human stupidity
RAH

AndyASPVB18-Apr-09 22:41