Loading Text Into .NET Web Browser Makes Tick Sound

[SteveChandler]

Attached is a vi that displays the time in a .NET Web Browser control. It updates once per second.

Everything works fine but on each reload Windows 7 causes a tick sound from my speakers. The first load does not make the tick - just each subsequent load.

How can I turn that off?

I am using LabVIEW 2010 but the attached vi is 8.6 so those of you without 2010 can open it.

[RavensFan]

That click is generated by windows.  You hear the same thing if you are in Internet Explorer and click on a link.

Go to Control Panel,  Sounds and Audio Devices.  Sounds tab.  Browse down until you find  Windows Explorer --  Start Navigation.  Mine is defaulted to Windows XP Start.wav.  Change the setting to (none)  at the top of the list.  Hit OK or Apply and the click will be gone.

[SteveChandler]

Thanks for the extremely quick reply but I should have been more specific. How can I programatically turn off the tick with LabVIEW just for this .NET container?

[smercurio_fc]

You can probably use the Windows API to do this. Haven't a clue how to do it, though. It's not a .NET operation - it's an operating system operation.

[Darin.K · Accepted solution]

On the dark side, I can use the Document->OpenNew method and then Document->Write method to update without that stupid click (wonder why I never use IE).  LV seems to give a Null reference to the Document property so that is out.  Using a Stream also gives a click.

Nuclear option:  Use the Registry Key: HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Current.  At the beginning of the VI, read the value (Default = Windows Navigation Start.wav).  Just before you update the DocumentText, write an empty string to this Key, and immediately after restore the value.

[SteveChandler]

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@Darin.K wrote:

LV seems to give a Null reference to the Document property

That kind of blows. Is it a bug or just a missing feature?

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Nuclear option:  Use the Registry Key: HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Current.  At the beginning of the VI, read the value (Default = Windows Navigation Start.wav).  Just before you update the DocumentText, write an empty string to this Key, and immediately after restore the value.

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Well it works so thanks. I guess sometimes drastic measures are needed.

All I want to do is have an html display of some data on the front panel. It does not need to be a full blown browser but I didn't know any other way. Is there a simpler way to just display html on the front panel?

[Ricky_V.]

Steve,

To answer the first question, I found a Volume Control Developer Zone  article that may be of help. If this works out for you, it may eliminate your second question, but I am looking at that as well.

Let me know how it goes.

Ricky V

[Ricky_V.]

Steve,

To answer this second question, try looking at these examples.

1)Ex - Programatically Changing HTML Pages to Display on My Front Panel.

2)Ex - Get HTML Source string from URL using ActiveX and Microsoft Internet Explorer

Hope these help.

Have a good one!

Ricky V