Re: Muting sound - C# Discussion Boards

Re: Thread Safe or not ...

9-Sep-05 4:42

The operations that you speak of were allow to be written in kind of a shortcut fashion in 2003, but shouldn't have been. You have to rewrite the code to follow the more strict threading rules of 2005.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

S. Senthil Kumar9-Sep-05 4:52

S. Senthil Kumar

9-Sep-05 4:52

This[^] might help.

Regards
Senthil
_____________________________
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Re: Thread Safe or not ...

Judah Gabriel Himango9-Sep-05 4:57

Judah Gabriel Himango

9-Sep-05 4:57

Windows Forms has NEVER been thread safe! In fact, Win32 common controls have never been thread safe. Even the new UI coming in Windows Vista is not thread safe. In .NET 1.1, the application would run ok for awhile, but you'd run into subtle bugs eventually. In .NET 2.0, a error is issued if you try to use Windows Forms controls from another thread.

If you want to use a Windows Forms control from another thread, use the Control.Invoke and Control.BeginInvoke methods:

void CalledFromAnotherThread()
{
   // Call textbox.Invalidate() method on the UI thread.
   myTextBox.Invoke((ThreadStart)myTextBox.Invalidate);
}

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Judah Himango

Muting sound

Lapje9-Sep-05 3:14

Lapje

9-Sep-05 3:14

Hi,

I want to be able to mute and unmute sound in Windows from my C# app. However, I have no idea where to start. Can someone give me some good links or sample code?

Thanks in advance

miah alom9-Sep-05 4:18

9-Sep-05 4:18

This is a CPP article and sample.

http://www.codeproject.com/com/VoiceMeter.asp

brunoconde9-Sep-05 4:23

brunoconde

9-Sep-05 4:23

Hello. I also dont know or worked so far with the system Sound but i think that is only possible with Microsoft DirectX. Download it and try.

Bruno Conde Wink | ;)

pharaoh

miah alom9-Sep-05 4:33

9-Sep-05 4:33

winmm.lib is the key. It has the API to control the System Volume.

Lapje9-Sep-05 5:41

Lapje

9-Sep-05 5:41

Just tried the dx sdk, but it seems it cannot handle system volume or something :S
Going for the lib now Smile | :)

Displaying a form with in a panel control

Lapje9-Sep-05 22:26

Lapje

9-Sep-05 22:26

A good sleep does good on you thinking. I found out my own how to solve this problem. Just emulate the Mute button on your keyboard, and it will do Wink | ;)

Rizwan Bashir9-Sep-05 3:04

Rizwan Bashir

9-Sep-05 3:04

I have one form which I want to display on one tab page of tab control on another form. is it possible that I can place that form as a control on a panel control or directly on the tab control ?

miah alom9-Sep-05 4:09

9-Sep-05 4:09

You cannot add a Form in the Panel Control. You have to use a UserControl instead.

Dave Kreskowiak9-Sep-05 4:37

9-Sep-05 4:37

Actually, you can. See my reply to the OP.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Dave Kreskowiak9-Sep-05 4:39

9-Sep-05 4:39

It can be done, but it's not obvious how to do it.
Read this[^] article on MSDN and it'll show you exactly how to do it. The samples are in VB.NET, but it's easy to convert to C#.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

miah alom9-Sep-05 4:46

9-Sep-05 4:46

Thats really cool. I am using .NET for 4 years now but never knew it.

Thanks.

Susan Hernandez9-Sep-05 13:18

Susan Hernandez

9-Sep-05 13:18

I think this just solved an unrelated problem I had, with a MDI Child that needed to show a "child" form of its own. It was acting really strange...

Anyway, I think this gives me an idea of what to try, and thanks for the link, very interesting.

Sue

Dave Kreskowiak9-Sep-05 14:07

Why Interface doesn't support fields?

9-Sep-05 14:07

Yeah, MDI Parent's can only have one set of children and MDI Children are not allowed to have children of their own. The onyl way around this limitation (imposed by Windows, not the .NET Framework) is to treat a form as a control.

Since the Form class derives from Control,

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Windows.Forms.Control
            System.Windows.Forms.ScrollableControl
               System.Windows.Forms.ContainerControl
                  System.Windows.Forms.Form

a Form can be hosted in any container that can accept a System.Windows.Forms.Control object.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

manimalap9-Sep-05 2:42

manimalap

9-Sep-05 2:42

Hai Friends,
I had one doubt.Why interface in c#.net doesn't support fields?
But Java interface supprots fields.How it is possible in java?
Any body knows the answer mail me.

Thnaks & Regards,
Manimala

Re: Why Interface doesn't support fields?

Guffa9-Sep-05 4:04

Guffa

9-Sep-05 4:04

Interfaces supports fields in java? That is strange.

Strictly oop speaking, fields should not be public at all, but only be accessible through properties. An interface only defines public members, so it should not contain fields.

Furthermore, specifying fields in an interface would force you to implement them in exactly that way, which is exactly opposed to the purpose of interfaces.

Also, specifying fields in an interface could make interfaces collide. If two interfaces specify the same field names, you could not inherit both interfaces in a class.

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b { font-weight: normal; }

Re: Why Interface doesn't support fields?

S. Senthil Kumar9-Sep-05 7:42

S. Senthil Kumar

9-Sep-05 7:42

You can have properties instead.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

How to make a Form *transparent* to clicks

Dario Solera9-Sep-05 2:21

Dario Solera

9-Sep-05 2:21

I'm searching a way to make a Form transparent to clicks. I mean that if the Form is clicked, the click will not be stopped, but it has to be sent behind the Form, to the next window or to the desktop. This behavior must be also used for mousedown, mouseup, and so on.

Please help...
Thanks

[ITA] Tozzi ha ragione: Gaia si sta liberando di noi.
[ENG] Tozzi is right: Gaia is getting rid of us.

miah alom9-Sep-05 4:34

9-Sep-05 4:34

Question: What is the Opacity of your form. Can you see the items behind the form.

Dario Solera9-Sep-05 7:47

Dario Solera

9-Sep-05 7:47

I mean at ANY opacity.
I know that with the opacity = 0, the form behaves like it wouldn't exists.

Do you have any idea?

[ITA] Tozzi ha ragione: Gaia si sta liberando di noi.
[ENG] Tozzi is right: Gaia is getting rid of us.

miah alom9-Sep-05 8:04

9-Sep-05 8:04

There is no direct way to do it. But there is a hack

using System.Runtime.InteropServices;
public class Form1 : System.Windows.Forms.Form
{
........implementation............

private bool FormMouseDown=false;
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (FormMouseDown==true) { return; }
FormMouseDown = true;
this.Visible = false;
SendDoubleClick();
Thread.Sleep(250);
this.Visible = true;
}

private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
FormMouseDown=false;
}

[DllImport("user32.dll")]
private static extern void mouse_event(UInt32 dwFlags,UInt32 dx,UInt32 dy,UInt32 dwData,IntPtr dwExtraInfo);

private const UInt32 MouseEventLeftDown = 0x0002;
private const UInt32 MouseEventLeftUp = 0x0004;

public static void SendDoubleClick()
{
mouse_event(MouseEventLeftDown, 0, 0, 0, new System.IntPtr());
mouse_event(MouseEventLeftUp, 0, 0, 0, new System.IntPtr());
mouse_event(MouseEventLeftDown, 0, 0, 0, new System.IntPtr());
mouse_event(MouseEventLeftUp, 0, 0, 0, new System.IntPtr());
}
}