Playing raw audio samples - C# Discussion Boards

leppie8-Oct-02 2:44

leppie

8-Oct-02 2:44

TheFLC wrote:
I would like to know if it's possible to pass a parameter to a thread so that I don't have to write two methods which do exactly the same thing apart from the contents of one variable being different.

Yes, define that variable (parameter) as an object, then check it during the handling of the delegate Smile | :)

Hop this helps Smile | :)

Before you criticize a man, walk a mile in his shoes. That way, when you do criticize him, you'll be a mile away and have his shoes.

Re: An interesting question I think

TheFLC8-Oct-02 2:10

TheFLC

8-Oct-02 2:10

I found the answer in the MSDN. It's in the index at Threads->Creating at the bottom of the page.

Big Grin | :-D

Windows 98 (win-doze): a 32 bit Extension to a 16 bit Graphical Shell of an 8 bit Operating System originally coded for a 4 bit Processor by a 2 bit company that can't stand one bit of competition.

A memory eater app... what could be wrong??

Anonymous7-Oct-02 14:11

Anonymous

7-Oct-02 14:11

hi,

i have an app that makes aspnet_wp only grow in memory.
It's causing us a lot of problems.
I'd like to know which is the best way of finding if there's a memory leak.
We access some COM+ components, and we think it could be them. Which is the best way to find out it? And, if the COM+ components are guilty, which is the best way of cleaning the memory they use?

thanks in advance

the trooper

Re: A memory eater app... what could be wrong??

David Stone7-Oct-02 17:36

David Stone

7-Oct-02 17:36

Do you have Visual Studio.NET Enterprise Developer or Architect? 'Cause if you do, then you can use the Visual Studio Analyzer and it'll tell you just about everything you wanted to know about your app.

Norm Almond: I seen some GUI's in my life but WTF is this mess
Leppie: I made an app for my sister and she wouldnt use it till it was colorful enough
Norm:good point leppie, from that statement I can only deduce that this GUI must be aimed at children
Leppie:My sister is 25
-Norm on the MailMagic GUI

Re: A memory eater app... what could be wrong??

Daniel Turini8-Oct-02 1:48

Daniel Turini

8-Oct-02 1:48

Anonymous wrote:
which is the best way of cleaning the memory they use?

Use System.Runtime.InteropServices.Marshal.ReleaseComObject(object)

"In an organization, each person rises to the level of his own incompetence." Peter's Principle

C# under SuSe Linux

gremlin7-Oct-02 13:13

gremlin

7-Oct-02 13:13

Hello!

Is there any chance or possibility to transfer a c# program into a
SuSe-Linux platform? So I know, Microsoft don't offer a platform SDK
for LINUX.
Can you help??? Suspicious | :suss:

Re: C# under SuSe Linux

Gerald Schwab7-Oct-02 13:17

Gerald Schwab

7-Oct-02 13:17

http://www.go-mono.com/[^]

Playing raw audio samples

David Williams7-Oct-02 12:45

David Williams

7-Oct-02 12:45

How do I?
Or, to be a little more precise, I would like to suck homemade audio samples from an buffer (e.g., noise might be a gaussian distribution of integers between + -32K)and feed them at the right rate to a soundcard (audio device) for real-time play. (I'm not trying to play an existing, saved wav file.) A simple application would be a VCO (oscillator with a slider controlling the frequency).

In the .net world, is this done by DirectX? By the WINAPI? wavePlay? Magic? Not at all?

Background note: a wavetable might contain one complete waveform of a sample, and the buffer might have as many repetitions of the sample as maching performance allows.

Re: Playing raw audio samples

leppie7-Oct-02 14:50

leppie

7-Oct-02 14:50

Have a look at my article http://www.codeproject.com/useritems/nBASS.asp[^]. That is one feature I havent tested yet, but the BASS API can do that. (just had a look, and I havent done that yet Frown | :(

havent had a need really, but you can load from a short[](16-bit) and play that. It is something I have been playing with recently, so it mite not be in the version on CP. Give me shout if its not there. Look for these functions: nBASS.BASS.LoadStream that takes a short[] as a parameter.

Cheers Smile | :)

PS: If you can mail me a "RAW" audio file, I will try make it work. Smile | :)

Before you criticize a man, walk a mile in his shoes. That way, when you do criticize him, you'll be a mile away and have his shoes.

IE History

Tomas Petricek7-Oct-02 12:31

Tomas Petricek

7-Oct-02 12:31

Hi,
Please help me Roll eyes | :rolleyes:

!

How can I get list of the pages in IE history ?
(i need only pages, that are shown when i click on arrow in ComboBox in IE adress panel)

Thank you

Re: IE History

Stephane Rodriguez.7-Oct-02 23:23

Stephane Rodriguez.

7-Oct-02 23:23

HKCU\Software\Microsoft\Internet Explorer\TypedURLs

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: IE History

Tomas Petricek8-Oct-02 1:33

Tomas Petricek

8-Oct-02 1:33

Thank you! Cool | :cool:

NotifyIcon does not pass correct coordinates

Joshua Nussbaum7-Oct-02 11:52

Joshua Nussbaum

7-Oct-02 11:52

I have a simple program with a NotifyIcon. I have set up my project to handle the NotifyIcon.MouseUp event.

private void notifyIcon_MouseUp(object sender, MouseEventArgs e)
{
// for some odd reason, this line always display "X=0;Y=0";
Console.WriteLine("X={0};Y={1};", e.X, e.Y);
}

The MouseEventArgs class passes information about the X and Y coordinates of the mouse click. But for some reason, it also passes X=0,Y=0 ?! I would expect to get the screen coordinates of the mouse click? has anyone noticed this? is this a bug?

Can't set breakpoints in release mode

Marc Clifton7-Oct-02 10:32

Marc Clifton

7-Oct-02 10:32

Is that true?

Thanks,
Marc

Re: Can't set breakpoints in release mode

Dave Moor7-Oct-02 10:44

Dave Moor

7-Oct-02 10:44

Thats the normal way things work.

Where would you know where to set the point, without the debug information (which is contained within the debug release) there is no way for the debugger to relate the compiled file back to the source code.

No doubt someone could/will come up with a more detailed answer but thats the gist of it.

Dave

Scrolling a Listview in C#

RK_20007-Oct-02 9:36

RK_2000

7-Oct-02 9:36

How do you scroll a C# Listview vertically automatically? I am looking for something similar to what you see in SQL Server profiler..it's not very difficult to accomplish this in MFC, but in C# I can't find a ScrollWindow type of function for the Listview or anything else...

Re: Scrolling a Listview in C#

John Hurrell7-Oct-02 10:18

John Hurrell

7-Oct-02 10:18

EnsureVisible is the method you need.

- John

XMLA Function Parser

Anonymous7-Oct-02 7:54

Anonymous

7-Oct-02 7:54

Well I am in need of a MDX function parser and do not want to reinvent the wheel.

anyone know where I can find one?

Print function

D Shen7-Oct-02 7:39

D Shen

7-Oct-02 7:39

Hi,

I have a listView control to display some command execution results. One of the features I need to implement is to print out this control. I have been investigating on System.Drawing.Printing but not found things I could use (directly). Can someone help me out and tell me where to start it? Thank you very much!;)

Re: Print function

shmuelt8-Oct-02 0:40

shmuelt

8-Oct-02 0:40

is it help
http://www.codeproject.com/combobox/print_preview_listbox.asp

shmuelt tauber
ministry of trade
Israel

Overriding base collections and using PropertyGrid

Zombies with Coffee, LLC7-Oct-02 5:51

Zombies with Coffee, LLC

7-Oct-02 5:51

Interesting problem I've encountered. I'm creating an override to a TabControl as well as a TabPage.

public class MyTabControl : TabControl<br />
{<br />
 ...<br />
}<br />
<br />
public class MyTabPage : TabPage<br />
{<br />
 ...<br />
}

When I view MyTabControl inside of the property control, I can click on 'TabPages - Collection' and view the collection of TabPages.

But I want the 'Add' button to create me a MyTabPage instead of the TabPage in my overridden control.

Is there any way to tell the PropertyGrid what my overridden collection type is?

Re: Overriding base collections and using PropertyGrid

leppie7-Oct-02 7:13

leppie

7-Oct-02 7:13

psdavis wrote:
When I view MyTabControl inside of the property control, I can click on 'TabPages - Collection' and view the collection of TabPages.

But I want the 'Add' button to create me a MyTabPage instead of the TabPage in my overridden control.

You will need to override the indexer ( this[] ) in your TabPageCollection derived class. Thats it. Have a look at the COllectionEditor class.

Cheers Smile | :)

Before you criticize a man, walk a mile in his shoes. That way, when you do criticize him, you'll be a mile away and have his shoes.

Match and Regular Expression

mkomasi7-Oct-02 3:58

mkomasi

7-Oct-02 3:58

My problem:
There is a string contains some patterns, same as below:

<br />
expr = "(X, <OS:Size>, Z), (X, <OS:Type>, Y), (X, <OS:DateModified>, W), (X, <PDF:Title>, U)";<br />

I want to put repeated pattern "( , < >, )" to items of a string array. For example:

<br />
 str[0] = "(X, <OS:Size>, Z)";<br />
 str[1] = "(X, <OS:Type>, Y)";<br />
 str[2] = "(X, <OS:DateModified>, W)";<br />
 str[3] = "(X, <PDF:Title>, U)";

How can I implement above? Can I write the same program using Regular Expression and Match? How?

Mehdi

Re: Match and Regular Expression

Paul Riley7-Oct-02 4:59

Paul Riley

7-Oct-02 4:59

Not easily, but you could use Regex.Split(expr, "), (|(|)") to break it down to
str[0] = "";
str[1] = "X, <os:size>, Z";
str[2] = "X, <os:type>, Y";
str[3] = "X, <os:datemodified>, W";
str[4] = "X, <pdf:title>, U";
str[5] = "";

OR you could use Regex.Match to create a MatchCollection. It might be a fairly complicated Expression though, something like @"\(\S,\s\S+,\s\S\)" I dunno, I just pulled that off the top of my head. I'm not sure if a "(" can be denoted as "\(" or not. \S is non-whitespace, \S+ is multiple non-whitespace, \s is whitespace.

Paul

Re: Match and Regular Expression

Richard Deeming7-Oct-02 6:02

Richard Deeming

7-Oct-02 6:02

This should work:

using System.Text.RegularExpressions;
...
string expr = "(X, <OS:Size>, Z), (X, <OS:Type>, Y), (X, <OS:DateModified>, W), (X, <PDF:Title>, U)";
 
Regex re = new Regex("(\\([^,]*,\\s*<[^>]*>,[^)]*\\))");
 
MatchCollection matches = re.Matches(expr);
string[] str = new string[matches.Count];
for (int i=0; i < matches.Count; i++)
    str[i] = matches[i].Value;

Explanation of the regular expression:

(...) - Capture the result of this expression as a match;
\\(...\\) - The expression is contained within regular brackets. NB: The bracket must be escaped, since it has special meaning for regular expressions. Since this is a normal C# string, the escape character must also be escaped;
[^,]*,... - Match anything except a comma zero or more times, followed by a comma;
...\\s*... - Match zero or more white-space characters;
...<[^>]*>,... - Match the < charcter, followed by zero or more characters which are not >, followed by >, followed by a comma;
...[^)]* - Match anything except a closing bracket.

To avoid having to escape the escape characters, you could make the regular expression string a verbatim string, by prefixing it with the @ symbol:

Regex re = new Regex(@"(\([^,]*,\s*<[^>]*>,[^)]*\))");

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