C# Discussion Boards - CodeProject

Angeluna2-Dec-03 23:11

Angeluna

2-Dec-03 23:11

Hi, I really nead a C (not c++) code for deconvolution of signals (not images)
Is there anybody that can help me? I'll be very happy.
Thanks, Angeluna.

Re: Help me please!!! Deconvolution

leppie3-Dec-03 8:26

leppie

3-Dec-03 8:26

Angeluna wrote:
Is there anybody that can help me?

No

leppie ::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.

Re: Help me please!!! Deconvolution

J. Dunlap3-Dec-03 9:07

J. Dunlap

3-Dec-03 9:07

Try the Visual C++ forum, please.

"But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness..." -- Galatians 5:22-23a

FLUID UI Toolkit | FloodFill in C# & GDI+

Tracking running applications

lithium692-Dec-03 22:56

lithium69

2-Dec-03 22:56

I have to write an application that has to track all applications that have been opened. Basically I have to record when an application was launched, from where (which file) it was launced. I have no idea where to begin. Any ideas?

Thanks

Re: Tracking running applications

Braulio Dez3-Dec-03 2:40

Braulio Dez

3-Dec-03 2:40

It's easy to get a list of the processes that are running, and when the started and finished, .. mmm.. take a look to

System.Diagnostics.Process

Some time ago I make an small tool that just pooled for something like that.

create global database connection

akokini_john2-Dec-03 21:23

akokini_john

2-Dec-03 21:23

Hi,
I'm just new to C#.net I just want to know how to create a global database connection, so that I will only use one connection in my application in all my forms. Hope I can find the answer... Thanks...

Re: create global database connection

Braulio Dez3-Dec-03 2:43

Braulio Dez

3-Dec-03 2:43

Hi,

you could create an static class, and have a method called "getConnection" from there you can get the connection from anywhere.

Just one advice... I would use connection less, instead of single connection, ... just connect to the database when you need it, the .net Framework keeps a pool of connections so no loose of performance when reopening the connection

HTH
Braulio

Re: create global database connection

Sean McCormack3-Dec-03 2:51

Sean McCormack

3-Dec-03 2:51

akokini,

There's a difference between defining the connection globally, vs. having a global connection. Defining the connection globally is good practice, and can be done either through the .config file, or through a static variable. Having a global connection is VERY bad, since it will destroy your ability to have proper connection pooling, and even worse, could cause serious problems between different classes if they're all using the same connection at the same time.

Here's an example of defining the connection through a static variable:

using System;
using System.Configuration;

namespace sean.config
{
public class Config
{

public static string DataBaseConnection = @"server=192.168.0.1;Trusted_Connection=false;uid=sa;pwd=;database=Northwind"}
}

You could then reference it anywhere in your code by doing the following:

SqlConnection conn = new SqlConnection(Config.DataBaseConnection)

You could take it a step further, and define the connection in a config file. Here's an example:

The configuration file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="mydb" value="server=192.168.0.1;Trusted_Connection=false;uid=sa;pwd=;database=Northwind" />
</appSettings>
</configuration>

The modified config class:

using System;
using System.Configuration;

namespace sean.config
{
public class Config
{

public static string DataBaseConnection = @ConfigurationSettings.AppSettings["mydb"];
}

I hope that helps!

Sean McCormack

Create query for excel

KSEI2-Dec-03 21:01

KSEI

2-Dec-03 21:01

Hi,

Can anyone tell me how can i create database query for an excel workbook with c#?
Thanks.

Re: Create query for excel

Braulio Dez3-Dec-03 2:45

Braulio Dez

3-Dec-03 2:45

I think you can access an Excel file just using ADO .net, take a look at the net for samples. Good luck

Re: Create query for excel

Heath Stewart3-Dec-03 3:38

Heath Stewart

3-Dec-03 3:38

Specifically, either using the OLE DB driver for Excel (using the System.Data.OleDb namespace classes), or the ODBC driver for Excel (download ODBC.NET from Microsoft).

-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----

PublicClass() is inaccessible due to its protection level

CJOakwood2-Dec-03 18:33

CJOakwood

2-Dec-03 18:33

I have this 3rd part DLL that when viewing in the Object Browser, the Class that I want to work with it public [public class PublicClass : System.Object].

When I set an object to the class [PublicClass myPublicClass = new PublicClass] I get the Compiler Error CS0122 [Class is inaccessible due to its protection level]

What seems to be the problem? Any help would be great.

Thx

Re: PublicClass() is inaccessible due to its protection level

Heath Stewart2-Dec-03 20:07

Heath Stewart

2-Dec-03 20:07

A couple things come to mind:

While the class is public, the default constructor might not be (or whatever constructor you're using). If you don't specify a default constructor, it is inherited (access modifier and all) from its parent. In your case, System.Object already has a public default constructor so you're class will inherit that unless overridden.
You may have a type name clash, and the compiler is choosing one over the other. It usually spits out warnings or errors, but who knows sometimes. Make sure you don't have a similarily named class from another imported namespace

Most likely, the problem is #1 above. The documentation for the C# compiler error CS0122 affirms such.

Re: PublicClass() is inaccessible due to its protection level

leppie3-Dec-03 6:08

leppie

3-Dec-03 6:08

If its a nested class it inherits the enclosing type accessablity. The same rules that are valid for type members are valid for nested types to.

leppie ::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.

keyboard accelerator c++

Anonymous2-Dec-03 18:11

Anonymous

2-Dec-03 18:11

need to create a keyboard accelerator that works in c++ with the dev c++ compiler =)

Re: keyboard accelerator c++

Heath Stewart2-Dec-03 20:02

Heath Stewart

2-Dec-03 20:02

And you're posting this in the C# forum why? No wonder you can't figure out a trivial task using the resource editor (hint).

drawing graph with c#

ramesh2619742-Dec-03 16:33

ramesh261974

2-Dec-03 16:33

plz anyone can give me a sourcecode for this? Cry | :((

plz plz plz

Re: drawing graph with c#

Heath Stewart2-Dec-03 16:48

Heath Stewart

2-Dec-03 16:48

Did you actually try searching this site first? There's tons of examples. And besides, this is too lengthy of an answer to provide in the forums - especially to just hand-out code (from which you learn nothing). Please try searching first. This search returned many hits, had you only tried: http://www.codeproject.com/info/search.asp?cats=3&cats=4&cats=5&searchkw=C%23+graphs[^]

Researching problems is a major part of any development project, no matter how great or how small.

Re: drawing graph with c#

Christian Graus2-Dec-03 17:26

Christian Graus

2-Dec-03 17:26

Or you could also look here:

C# graph code

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: drawing graph with c#

Nick Parker2-Dec-03 17:54

Nick Parker

2-Dec-03 17:54

Christian Graus wrote:
C# graph code

That's even worse than John Simmons link. Laugh | :laugh:

-Nick Parker
DeveloperNotes.com

Re: drawing graph with c#

Christian Graus2-Dec-03 17:56

Christian Graus

2-Dec-03 17:56

Three posts in three days, all from new accounts, all who have posted only one question - the same question. Give me a break.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Re: drawing graph with c#

Heath Stewart2-Dec-03 20:11

Heath Stewart

2-Dec-03 20:11

Enlighten me, Nick!

As for Christian's link, I'll definitely be waiting to pounce on Bjarke with that one at work! Poke tongue | ;-P

Re: drawing graph with c#

Nick Parker3-Dec-03 1:45

Nick Parker

3-Dec-03 1:45

Heath Stewart wrote:
Enlighten me, Nick!

Here[^] is John Simmons / outlaw programmer[^] help page. Smile | :)

-Nick Parker
DeveloperNotes.com

Re: drawing graph with c#

Heath Stewart3-Dec-03 3:26

Heath Stewart

3-Dec-03 3:26

Yeah, Christian's is much better!

Re: drawing graph with c#

Heath Stewart2-Dec-03 20:00

Heath Stewart

2-Dec-03 20:00

That's the damn funniest thing I've seen / heard in weeks - even more than my MIS cracks I dish-out to Nick Parker! Laugh | :laugh:

I definitely have to remember that...

I agree with your sentiments entirely (and your more-than-adequate comments are much shorter than my jabs - I guess I should take note...and use that very same link).

People who post such blatently stupid questions don't even bother to google the 'net or search CP, it's no suprise they don't search the SDK documentation (.NET, Platform SDK, whatever). Too many people in this field think the ability to write "hello, world" apps makes them a developer!

Thanks for the hilarious link! I'll be sure to throw that one in after I'm tired of stupid questions, too.

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