.NET (Core and Framework)

18-Oct-07 5:04

If I'm in the wrong place or this is a stupid question I apologise in advance.
I am having to write a data acquisition program in .NET (C#) before I’ve had time to learn it which is making for some interesting code. What I would really like to do is reference a group of 24 progress bar components within a for/next loop using the index of the loop. Does anyone know how to do this? The code I use at the moment is very inelegant and bugs me. Would appreciate any pointers (sorry ‘bout pun)

Ted Edwards

led mike18-Oct-07 5:29

led mike

18-Oct-07 5:29

Wow Ted, that just sounds horrible. But given your situation:

sysrev wrote:
before I’ve had time to learn it

and

sysrev wrote:
a group of 24 progress bar components

With that situation I would go with "if it works, I don't care".

sysrev18-Oct-07 5:32

18-Oct-07 5:32

But I'll need to do it again somewhere - and again, and again.........

Ted Edwards

Robert Rohde18-Oct-07 13:34

18-Oct-07 13:34

Hi,

hard to give a good answer without knowing your exact situation. You could add all progress bars to a List<progressbar>. After you have done this once you can iterate the list with for/foreach or whatever technique you like.

Robert

sysrev19-Oct-07 0:00

19-Oct-07 0:00

Thanks for the suggestion Robert.

The progress bars display the output of a pressure sensor over a 24 hour period. When I get a new reading, I shift values chronologically "down" one bar and put the new value in the "top" (most recent) bar. The coding begs for an iterative loop but I don't know how to address the bars name property with the index. So I ended up using a switch construct which works okay but is awkward to maintain.

The List class is new to me and on your suggestion I had a quick look at it. I must say, it does not look promising but will try it out if I can.

Ted

Robert Rohde19-Oct-07 3:18

19-Oct-07 3:18

Hi,

I'll try to outline what I meant:

//Field declaration in the Form/UserCotrol
private List<ProgressBar> _bars;

//somewhere after the InitializeComponents call
_bars = new List<ProgressBar>(new ProgressBar[] { pb1, pb2, pb3, ... });

//when you want to update the bars
for (int i = 0; i < 24; i++) 
{
   _bars[i] = someArrayWithTheValues[i];
}

With the mod operator you could also easily switch which hour should be displayed at the top:
int hourToDisplayAtTop = 4;

for (int i = 0; i < 24; i++) 
{
   _bars[i] = someArrayWithTheValues[(i + hourToDisplayAtTop) % 24];
}

Robert

sysrev19-Oct-07 4:22

19-Oct-07 4:22

I think I can see what you are suggesting and am trying to experiment with it in a new application as here:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace IndexComponents
{
public partial class Form1 : Form
{
private ProgressBar pb1;
private ProgressBar pb2;
private ProgressBar pb3;
private List<ProgressBar> _bars;
public Form1()
{
InitializeComponent();
int[] someArrayWithTheValues = new int[3] { 1, 2, 3 };
//Field declaration in the Form/UserCotrol
/// private List _bars;
//somewhere after the InitializeComponents call
/// _bars = new List(new ProgressBar[] { pb1, pb2, pb3 });//when you want to update the bars
_bars = new List<ProgressBar>(new ProgressBar[] { pb1, pb2, pb3 });//when you want to update the bars
for (int i = 0; i < 3; i++)
{
_bars[i] = someArrayWithTheValues[i];
}
//With the mod operator you could also easily switch which hour should be displayed at the top:
int hourToDisplayAtTop = 2;

for (int i = 0; i < 3; i++)
{
_bars[i] = someArrayWithTheValues[(i + hourToDisplayAtTop) % 24];
}
}
}
}

I am now working on the last two(I hope!) build error which are flagged within the two for loops as below:
Error 1 Cannot convert type 'int' to 'System.Windows.Forms.ProgressBar'
Error 2 Cannot implicitly convert type 'int' to 'System.Windows.Forms.ProgressBar'

Ted Edwards

Robert Rohde19-Oct-07 6:05

19-Oct-07 6:05

Replace _bars[i] = ... with _bars[i].Value = ...
(Sorry, my mistake)

Robert

sysrev20-Oct-07 0:52

How to check of folder is public?

20-Oct-07 0:52

That's great. It all works - I can experiment further now I have a working example.
Thanks for your help.

Ted

Vitaly Tomilov18-Oct-07 1:19

Vitaly Tomilov

18-Oct-07 1:19

PC Administrator, using my application, needs to select a folder in which any standard user could read and write. My application needs to verify for any selected folder whether a standard user can read-write into it. How do i do that?

Note that the folder is being set up by Administrator, so checking current read-write access is no good.

Free C++ libraries with source code on www.neatcpp.com: TWAIN, DirectShow, Interprocess Communications, etc...

Re: How to check of folder is public?

Robert Rohde18-Oct-07 13:42