C# Discussion Boards - CodeProject

Re: Executing Another Windows Process

kasik14-Feb-06 8:14

kasik

14-Feb-06 8:14

You can use the Process class (part of the System.Diagnostics namespace)

using System.Diagnostics;
...
    Process.Start("<path to .exe>");

Cheers,
Will H

best way to read string

cppdotnet14-Feb-06 7:43

cppdotnet

14-Feb-06 7:43

I have this number from which I have to read first few number depending on another number. What is the best way to do that.

For example ... NumToread = 3 , number = "4567889465"

answer should newNum = 456

i can do that using for (int i=1;i<=NumToread ;i++)
does any one knows better way ...

As you can say .. I am very new to programming

Thanks

CPP

Thanks

Re: best way to read string

Joshua Quick14-Feb-06 8:56

Joshua Quick

14-Feb-06 8:56

You should use the String.Substring() method.

int numToRead = 3;<br />
string buf = "123456789";<br />
buf = buf.Substring(0, 3); // buf now = "123"

Re: best way to read string

cppdotnet14-Feb-06 10:32

cppdotnet

14-Feb-06 10:32

Thanks

Thanks

change global project dbConnectionString during runtime

cpramhofer14-Feb-06 7:23

cpramhofer

14-Feb-06 7:23

hi all!

my problem
i have a project using .NET 2 in vs.net 2005
in a DataSet i have data from an access-db.
the connection string is stored in the Properties.Settings.Default ...

what i want is that i can change the *.mdb file during runtime so that each user of the programm can set its own db file.

does anyone know how i can do this???

Re: change global project dbConnectionString during runtime

CWIZO14-Feb-06 21:04

CWIZO

14-Feb-06 21:04

I don't see the probblem.
If the user is running his program on his computer then you can do whatever you want, no?
If you have a web page then simply store the file name in a session or something like that.

Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!

How to Place a MDI Child on Parent form panel controll

GetFree123GetFree14-Feb-06 6:09

GetFree123GetFree

14-Feb-06 6:09

I have a MainForm (MDIParent), a ChildA form and a Child1OfChildA Form. I have a Panel controll on ChildA Form, How can i place Child1OfChildA on this panel controll on ChildA from?
Thanks

dword values in .reg files

Lara Pate14-Feb-06 6:08

Lara Pate

14-Feb-06 6:08

I have a c# program which retrieves registry settings & writes them out to a .reg file for storage on a network so some application settings can easily be restored after an operating system upgrade, etc. Everything was going just fine until I came across a value of type dword.

If I manually export it from the registry, this is how the name and value look.
"Number of Macros"=dword:00000012

The .GetValue method brings the value in as type System.Int32 with a value of 18 (there are 18 macros defined in that app). Is anyone familiar with this dword type and what I would convert Int32 to to get this value of 00000012?

Thanks in advance for any help!

Lara

Re: dword values in .reg files

Andy Moore14-Feb-06 6:23

Andy Moore

14-Feb-06 6:23

The dword type is a 32-bit signed integer on 32-bit systems. The output you are getting from the registry is 0x00000012 which is 18 in hex. The registry stores dword values in hex. You could always do a decimal to hex conversion to convert 18 to its hex value.

Andy

Deus caritas est

Re: dword values in .reg files

Lara Pate14-Feb-06 6:53

Lara Pate

14-Feb-06 6:53

Got it. Excellent. Thanks!

Custom Stack

Hyland Computer Systems14-Feb-06 5:56

Hyland Computer Systems

14-Feb-06 5:56

I get this error when I try to use implement the IEnumerable interface:

Error 1 'generics.GenStack<t>' does not implement interface member 'System.Collections.IEnumerable.GetEnumerator()'. 'generics.GenStack<t>.GetEnumerator()' is either
static, not public, or has the wrong return type.

Here is the code segment:

// Custom Stack - designed to accept class instances only
public class GenStack<t>: IEnumerable<t>
where T : class
{
private T[] stackCollection;
private int count = 0;
// Constructor
public GenStack(int size)
{
stackCollection = new T[size];
}
public IEnumerator<t> GetEnumerator()
{
string totList = "";
for (int i = 0; i < count; i++)
{
yield return stackCollection[i];
totList+= stackCollection[i]+" ";
}
object ob = totList ;
yield return (T)ob;
}
.
.
}

I am implementing the GetEnumerator(), though. Am I missing something?

Thanks in advance

Re: Custom Stack

PicklesTheClown14-Feb-06 10:51

PicklesTheClown

14-Feb-06 10:51

A little curious by your code snippet. Try:

<code>
public class GenStack<T> : IEnumerable<T> where T:class
{
public GenStack(...) { ... }
public IEnumerator<T> GetEnumerator() { }
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { }
}
</code>

-- modified at 16:53 Tuesday 14th February, 2006

Button Customization to MessageBox

2hdass14-Feb-06 4:47

2hdass

14-Feb-06 4:47

Can someone tell me how exact it is to customize the size of the buttons in the MessageBox control? I am planning to make my MessageBox by inheriting the one in the .net library.

I know there is something to do with the onPaint event handler, but i am not very sure

thx for all your help Big Grin | :-D

Re: Button Customization to MessageBox

Andy Moore14-Feb-06 5:20

Andy Moore

14-Feb-06 5:20

As far as I know you cannot inherit the one in the .NET library since this is simply a wrapper around the Win32 MessageBox functions.

What I have done is to use a CBT hook to hook the MessageBox right before it is displayed, and in the CBT_ACTIVATED I can change/add/delete controls on the MessageBox. You can get the control ids using Spy++ on any MessageBox. There is a lot of interop involved with this but it works fine. You need to learn about CBT hooks and P/Invoke with .NET to make this work.

I hope this helps.

Andy

Deus caritas est

Re: Button Customization to MessageBox

Paul Conrad14-Feb-06 5:24

Paul Conrad

14-Feb-06 5:24

Why not just create a dialog form that is your own custom MessageBox? You then could use any controls in it you want.

Paul

Persistent states for GUI

smurfy3414-Feb-06 4:21

smurfy34

14-Feb-06 4:21

Hi:

does dotnet/c# offer any smart and automated ways to preserve user preferences in GUIs such as controls users like to have checked or unchecked?

Thanks, smurfy

Re: Persistent states for GUI

Paul Conrad14-Feb-06 4:48

Paul Conrad

14-Feb-06 4:48

smurfy,

Not sure if .net has the ability, but saving control states in a database may be the way to go, depending on how many controls you are working with.

I hope this helps some,

Paul

Re: Persistent states for GUI

StealthyMark14-Feb-06 5:50

StealthyMark

14-Feb-06 5:50

VS2005 does. It saves initial values for just about any aspect of a component (control) in a app.config file, and stores user-specific and machine-specific settings in the application data directory in the appropriate profile directory. You can read, write and save settings anywhere in your application.

Mark

Re: Persistent states for GUI

Paul Conrad14-Feb-06 5:57

Paul Conrad

14-Feb-06 5:57

Cool, learned something new today Smile | :)

Paul

Re: Persistent states for GUI

Paul Horstink29-Apr-06 1:39

Paul Horstink

29-Apr-06 1:39

** You can read, write and save settings anywhere in your application.

Ok, in VB.net there's My.Settings, but how about c#, how do I do this in C#?

Border Color customization in ListBox and CheckedListBox

VPMahank14-Feb-06 4:10

VPMahank

14-Feb-06 4:10

With BorderStyle set to Fixed Single, in the Paint method I tried to draw my own border color but the Paint would never get called for ListBox/CheckedListBox. Is there any difference from ListBox/CheckedListBox and other controls. I know that we need to override OnDrawItem , OnMeasureItem to customize the items in the ListBox but how do I change the border color of the ListBox itself?

protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (this.BorderStyle == BorderStyle.FixedSingle)
System.Windows.Forms.ControlPaint.DrawBorder(e.Graphics, ClientRectangle, _borderColor, ButtonBorderStyle.Solid);

}

Thanks in advance,

VPMahank

Re: Border Color customization in ListBox and CheckedListBox

Andy Moore14-Feb-06 4:19

Andy Moore

14-Feb-06 4:19

You may have to handle WM_NCPAINT to do this since the border is not part of the client area.

Deus caritas est

convert digit

amin saffari14-Feb-06 3:57

amin saffari

14-Feb-06 3:57

i want a component that convert numeric of digit to alphbet digit

########################

Re: convert digit

Paul Conrad14-Feb-06 4:15

Paul Conrad

14-Feb-06 4:15

amin saffari wrote:
i want a component that convert numeric of digit to alphbet digit

You forgot the magic word, and could you explain a little more in detail what you are trying to accomplish?

Re: convert digit

walcott14-Feb-06 4:30

walcott

14-Feb-06 4:30

byte b;

(char) b;

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