C# Discussion Boards - CodeProject

Divyang Mithaiwala15-Jan-06 16:17

15-Jan-06 16:17

I have to design a system to listen radio & do some DSP task in radio(on Analog to Digital converted) signals.

This task is CTCSS detection/genaration,DTMF detection/genaration, RF Audio detection & also other filtering processing with making of filter graph.

All are done with C#.Net.

Can you help me?

-- modified at 2:18 Monday 16th January, 2006

DirectShow future ?

Christian Graus15-Jan-06 11:13

Christian Graus

15-Jan-06 11:13

As far as I am aware, DirectShow is dead. Does anyone have any ideas what we're supposed to use to play video, to capture video from devices, etc. in the future ?

Christian Graus - Microsoft MVP - C++

Re: DirectShow future ?

Judah Gabriel Himango15-Jan-06 17:58

Judah Gabriel Himango

15-Jan-06 17:58

I don't think DShow is dead; it's just not part of the DirectX SDK since it is not limited to games. If what I've read is true, DirectShow is now part of the Platform SDK. *edit* according to this page[^], it was moved to the PSDK this past April. *edit*

What are managed code developers supposed to use? Well, we can use DirectShow via COM interop. There's a good CP article on this here[^]. I think I've mentioned to you before, the WinFX APIs are really where everything's headed; after talking with you recently about this, I looked into WinFX and the multimedia support really blows away what is available today. I saw some a demo of video being played back as the "texture" on interactive 3d objects...all in a pure WinFX application.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Little House on the Flickr
Judah Himango

Re: DirectShow future ?

Christian Graus15-Jan-06 18:00

Christian Graus

15-Jan-06 18:00

Yeah, I've seen WinFX demos, in Seattle. I agree, it's awesome. But, this is what I'm afraid of. That Microsoft is pushing us to use WinFX. Why am I afraid ? Because I can't afford to tell people I work for that my code now targets only Windows XP and above.

Christian Graus - Microsoft MVP - C++

Re: DirectShow future ?

Judah Gabriel Himango16-Jan-06 4:49

Judah Gabriel Himango

16-Jan-06 4:49

If Windows 98 & 2000 compatibility is really that important, your best bet is probably to use DirectShow via COM interop.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Little House on the Flickr
Judah Himango

DirectX SDK help in visual c# express 2005

3Dizard15-Jan-06 7:38

3Dizard

15-Jan-06 7:38

Hi, it's been a long time since my last post here, but here my new one is:
Well, I recently installed visual c# express edition 2005, which seems to work fine. Later I installed the DirectX sdk (december 2005 release). As the readme tells me, only the documentation for managed DirectX should be available in visual studio 2005 express edition document browser. Well, that's fine for me, but there's nothing in visual studio 2005. I installed the express edition in c:\Microsoft Visual Studio 8\, which is not standard, but can this be the reason? I can tell my project where to look for the directx dlls, but the help isn't included though documentation was installed: Nothing in the documentation browser, nothing if I move my mousecursor over DirectX specific code and nothing if I hit F1. Rest of the sdk seems to be installed properly (external documentation, debug version, etc). So how can I fix that? Hope someone can help me.

Thanks.

Re: DirectX SDK help in visual c# express 2005

DigitalKing15-Jan-06 12:08

DigitalKing

15-Jan-06 12:08

The documentation should be in "C:\Program Files\Microsoft DirectX SDK (December 2005)" or some similar folder.

Re: DirectX SDK help in visual c# express 2005

3Dizard17-Jan-06 3:42

3Dizard

17-Jan-06 3:42

Well, that's not what I meant. I know where to find the documentation. My Problem is that I can't use the (let me call it) advanced help in visual studio. As I read DirectX help should be integrated in visual studio automatically when visual studio is installed and you install the DirectX SDK. But when I install, there's nothing in VS. Due to the fact that I use Visual C# 2005 express edition only the managed DirectX help should be available (referring to the readme of the December 2005 DirectX SDK), but it is not for me. So that's the problem. I'd still appriciate any suggestions.

Thanks

How to extract comments out of a C# code file?

Muhammad Asim Khan Afridi15-Jan-06 6:22

Muhammad Asim Khan Afridi

15-Jan-06 6:22

I want to actually extract comments ( of both '//' and '/* ..... */ styles ) from a C# code file. I want some halp regarding how to implement this ?
I want to extract all comments as follows
1. starting with //
2. comments inserted in old /* ....... */ style.
please give me any hints or links
ragards,

Re: How to extract comments out of a C# code file?

gnjunge15-Jan-06 7:38

gnjunge

15-Jan-06 7:38

You can write a tool that loops over all your source files, opens them, and uses regular expressions to search for the above mentioned patterns, and removes them.

Re: How to extract comments out of a C# code file?

leppie15-Jan-06 9:25

leppie

15-Jan-06 9:25

A simple regex will do it, somethng like:

//.*\n|/\*.*\*/

enable multiline option.

xacc.ide-0.1.1.11 - now with Settings & AutoComplete(kinda)

How to trap Alt + Down key in WndProc

code_wiz15-Jan-06 5:28

code_wiz

15-Jan-06 5:28

Hi - I need to trap Alt + Down keys together in WndProc - any ideas how i can do that.

i.e. specifically what message values are these keys having been pressed.

I know i can handle this in KeyDown, but if i wanted to do this in WndProc, how to?

Thanks.

Re: How to trap Alt + Down key in WndProc

DigitalKing15-Jan-06 12:04

DigitalKing

15-Jan-06 12:04

Try this:

private const int VK_LEFT = 0x25;
private const int VK_UP = 0x26;
private const int VK_RIGHT = 0x27;
private const int VK_DOWN = 0x28;
private const int VK_MENU = 0x12;

private const int WM_SYSKEYDOWN = 0x0104;
private const int WM_SYSKEYUP = 0x0105;

protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        case WM_SYSKEYDOWN: //Some Alt+Key was pressed
            if (m.WParam.ToInt32() == VK_DOWN) //Alt+Down
            {
                MessageBox.Show("User pressed Alt+Down");
            }
            break;
    }

    base.WndProc(ref m);
}

deleting in use files

hassan azizi15-Jan-06 3:56

hassan azizi

15-Jan-06 3:56

how i can delete in use files in my program using IO.File class?

-- modified at 9:59 Sunday 15th January, 2006

Re: deleting in use files

Dave Kreskowiak15-Jan-06 4:19

Dave Kreskowiak

15-Jan-06 4:19

You can't. It's as imple as that.

The file must be closed, by every process that has it open, before you can delete it, move it, or rename it.

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

Re: deleting in use files

CodyGen15-Jan-06 4:26

CodyGen

15-Jan-06 4:26

I don't know for sure if there is a way using c#. I encounter same problem with deleting files that are currently in use. You can try using the force delete of vbscript if that is applicable. It works for me.

Re: deleting in use files

Dave Kreskowiak15-Jan-06 13:17

Dave Kreskowiak

15-Jan-06 13:17

Not even that will force-delete a file that is locked open by any process.

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

Re: deleting in use files

Daniel Grunwald15-Jan-06 4:53

Daniel Grunwald

15-Jan-06 4:53

Files in use cannot be deleted.
But you can use this:
[System.Runtime.InteropServices.DllImport("kernel32.dll")]
private static extern bool MoveFileEx(string lpExistingFileName, string lpNewFileName, int dwFlags);
const int MOVEFILE_DELAY_UNTIL_REBOOT = 0x00000004;

static void MarkFileToDeleteOnReboot(string fileName)
{
MoveFileEx(fileName, null, MOVEFILE_DELAY_UNTIL_REBOOT);
}

how to auto refresh listbox values

batmanAgen15-Jan-06 3:02

batmanAgen

15-Jan-06 3:02

hi guys,

im listing all the running processes in a machine and put the values inside a listbox control. i want to be able to update the process/application list every, lets say 2 seconds... how can i do that? nid help asap..tnx.. Smile | :)

Re: how to auto refresh listbox values

CodyGen15-Jan-06 4:15

CodyGen

15-Jan-06 4:15

try clearing the listbox before putting your items again. Drop a Timer Control and set the Interval to 2000(2 seconds) and set it to Enable=true:

private void timer1_Tick(object sender, EventArgs e)
{
populatelist();
}
private void populatelist()
{ /*assume that your list of proccesses are coming from an arraylist arlist*/
listBox1.Items.Clear();
for (int i = 0; i < 5; i++)
{
listBox1.Items.Add(arlist[i].ToString());
}
}

Re: how to auto refresh listbox values

batmanAgen15-Jan-06 4:22

batmanAgen

15-Jan-06 4:22

tnx a lot codyGen! Big Grin | :-D

it worked! although my listbox flickers a bit.. Smile | :)

but it works fine.. Big Grin | :-D

Re: how to auto refresh listbox values

Ravi Bhavnani15-Jan-06 7:39

Ravi Bhavnani

15-Jan-06 7:39

batmanAgen wrote:
although my listbox flickers a bit

myListBox.BeginUpdate();
// refresh contents of myListBox
myListBox.EndUpdate();

/ravi

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images...JPEG or BITMAP

sa maq14-Jan-06 23:00

sa maq

14-Jan-06 23:00

i am a bachelors student in Pakistan...recently i have done some work in C# concerning to image capturing and editing...so far i have been successful with the basic filter and image operations...all i wanna know is that should i contineu using the BITMAP class or should i search for any API which functions for JPEG in .Net and then move ahead with my work... eagerly waiting for reply coz i have a criticle time constraint Big Grin | :-D

Re: images...JPEG or BITMAP

Guffa14-Jan-06 23:20

Guffa

14-Jan-06 23:20

When you work with images, they are always in a bitmap form. Don't confuse this with a Windows bitmap file (.bmp), though. What you have in a Bitmap object is an image in bitmap form, not a .bmp file.

From a Bitmap object you can save the image to several file formats, including Windows bitmap (.bmp), JPEG (.jpg/.jpeg/.jpe), GIF (.gif), PNG (.png), et.c.

It's not possible to edit images in JPEG form, you have to decompress the image to bitmap form by loading it, edit it, then recompress the image by saving it as JPEG.

---
b { font-weight: normal; }

c# program using a barcode scanner

steve_rm14-Jan-06 20:18

steve_rm

14-Jan-06 20:18

Hello

I am writing an program that will use a bar code scanner to scan products. The product code will be looked up in a database and return the details of the product to the windows form.

I have never worked with this barcode hardware before, and before l purchase some a bar code scanner. I need some questions answered.

Does the barcode scanner come with any software?
It is easy to interface a c# windows program with a barcode scanner?
Does the barcode scanner connect through the USB port?
Does anyone know any example programs where this has been done?

Thanks very much in advance,

Steve

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