list view control issue - C# Discussion Boards

C# does not do anything optimised to load imags. Multiple your width x height x 3 and you have the minimum number of bytes needed to load an image. No way around that without seeking out some sort of third part tiling library

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

A possible way to load large images would be to convert the file to a BMP or similar, strip out the header, and then use a FileStream to read a block of bytes (you'll need the width of the image, which you can get from the header). Then you'd have to turn your bytes into a bitmap. In a windows bitmap, there should be three bytes per pixel, and in the order BGR.

Of course, there are a few problems i see. It will probably be quite slow, rather difficult, you'd have to be able to convert the whole image on the fly before using it, again, thats gonna suck up some time, especially with such HUGE images.

My current favourite word is: Bacon!

-SK Genius

Hey guys,

ive been developing a pretty involved software package for the time and attendance industry, now the boss wants this application web based(ASP)...

Is it posible to convert my currenct project to run as an asp website or do you think we should hire an asp.net programmer to rewrite the front end for asp?

the problem i have with rewriting for asp aswell is that now im sitting with two of the same programs on two different platforms that needs to be maintained... id bet thats going to be a major head ache!

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

i m afraid but u have to implement it again in asp.net
and it will be easy if u implement your application as a multi tier application

AS someone else said,if you developed the first app properly, all you should need to do, is write your presentation layer and use the same middle/data tier. But, web sites being stateless, it's never as easy as all that, you basically need to re-engineer your middle tier so that it plays nice in a stateless environment, and write a front end. There's plainly no automatic way to do this

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

thanx Christian...

i didnt think it would be that simple, but it doesnt hurt to ask! Smile | :)

my application is broken up into 4 tiers(i think) as you call it... Theres a front end(the part the end user will work with), server service (this is mainly for all the instances of the applications to be able to talk to eachother), communications service(this service gets data from external bio metric scanners) and a SQL database.

so ONLY the front end will need to be rewritten for asp... right?

now a different question, im still in the process of developing this entire system... do you think i should get the asp developer now to start off with the web based front end OR wait until there is a release able version of the winForms version before kicking off the asp version?

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

HarveySaayman wrote:
so ONLY the front end will need to be rewritten for asp... right?

Most people will say 'yes' but the truth is, odds are good your client side app relies on keeping objects in memory, which won't work in ASP.NET, so you will probably have to retool some mddle tier stuff as well.

HarveySaayman wrote:
do you think i should get the asp developer now to start off with the web based front end OR wait until there is a release able version of the winForms version before kicking off the asp version?

I would get him started now, so he can guide the development of the middle tier, if it's still evolving, to suit him better, or if it's finished, he may as well get started, so that the changes he has to make to the middle tier can be worked to also fit with the winforms app, prior to release.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Hi
I have a form with 3 list controls. i have filled all the controls using the same dataset. when i try to select a first item in the first list box, the corresponding first item in the 2nd and 3rd list box controls getting selected. Why i'm getting this issue?

Thanks in advance

regards
sri

Because they all have the same data source. Use the Clone method on your data source to make copies, and then when each control has it's own copy, the problem will go away.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Thanks a lot Christian Graus

Hi All,

Can anyone tell me How to prevent MDI child from maximizing in c#

Thanks in Advance

~Pramod

hi pramodgupta24,
U can set child form property Maximize box to false.....

Can anybpdy tell me why we are using Serialization , if we can save the data directly to data base... then what is the use of saving it on hard disk

Thanks in advance

vikas da

Not every app, needs a database.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

can you please tell me like where it can be used in real time ...

vikas da

For example, I have a program where we use serialization to store a list of class instances that we want to be able to change by simply changing the config file, in an app that has no database.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Some examples where serialization can be uses:

* Load / Save documents in your app (where each document is object based)
* App configs / settings
* Offline data in smart clients
* As a file based queue before you write data to a DB

Blog: http://www.rogeralsing.com
Projects: http://www.puzzleframework.com

How do I fix this mess!! trying to C# programme which displays changing minutes and seconds, representing them by two long rectangles, maximum width of rectangle equal to 600 pixels (10 pixels for each minute and each second). redraw the two rectangles every second. please help!!!!

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

namespace WindowsApplication1
{
public partial class Form1 : Form
{
private Random randomNumber = new Random();
//private void timer1_Tick();
private Graphics paper;
public Form1()
{
InitializeComponent();
paper = progressBar1.CreateGraphics();
timer1.Interval = 600;
timer1.Enabled = true;
//count = count + 1;
//label1.Text = Convert.ToString(count / 60);

}

private void start_Click(object sender, EventArgs e)
{
timer1.Start();
}

private void stop_Click(object sender, EventArgs e)
{
timer1.Stop();
}

private void clear_Click(object sender, EventArgs e)
{
paper.Clear(Color.White);
}

private void timer1_Tick(object sender, EventArgs e)
{
//int x = 5;
//int y = 20;
int x, y, size;
Brush myBrush = new SolidBrush(Color.Black);
x = timer1.Tick+= progressBar1.Width;
y = timer1.TickGetType+= progressBar1.Height;
size = randomNumber.Next(1, 60);
paper.FillRectangle(myBrush, x,y,size,size);

ketto wrote:
paper = progressBar1.CreateGraphics();

Disaster. Handle the paint event and invalidate your form in the tick event instead.

ketto wrote:
size = randomNumber.Next(1, 60);

If it's a clock, why does it move randomly ?

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

any suggested alterations on this code???

Well, I'd say read up on the paint event and start again. If this is meant to be a clock, I can only assume you copied it from somewhere and you're trying to change it to work as a clock ? Start from scratch.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

yes I did copy frpm some where and I thought it would guide me in getting what am trying to do. I now can't make sense of what am trying to do hence my post

Funny, I got a 1 and a 5 in the same thread....

Copying code you don't understand is never a good start. Someone posted code that should do all of what you want. I'd have preferred to walk you through it bit by bit, but you have the code on this thread, now I recommend you take the time to study it and research the bits you don't understand, so you learn from it.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

<br />
using System;<br />
using System.Windows.Forms;<br />
using System.Drawing;<br />
<br />
namespace WindowsApplication1<br />
{<br />
    public partial class Form1 : Form<br />
    {<br />
        private Brush myBrush;<br />
        private Graphics paper;<br />
<br />
        private const int barWidth = 40;<br />
<br />
        int seconds, minutes;<br />
<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
<br />
            this.myBrush = new SolidBrush(Color.Black);<br />
            this.paper = pictureBox1.CreateGraphics();<br />
<br />
            this.timer1.Interval = 1000;<br />
<br />
            this.seconds = 0;<br />
            this.minutes = 0;<br />
        }<br />
<br />
        private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            this.timer1.Start();<br />
        }<br />
<br />
        private void button2_Click(object sender, EventArgs e)<br />
        {<br />
            this.timer1.Stop();<br />
        }<br />
<br />
        private void timer1_Tick_1(object sender, EventArgs e)<br />
        {<br />
            this.paper.Clear(SystemColors.Control);<br />
<br />
            if (this.seconds < 60)<br />
                this.seconds++;<br />
<br />
            else<br />
            {<br />
                this.seconds = 0;<br />
                this.minutes++;<br />
            }<br />
<br />
            paper.FillRectangle(myBrush, 0, 0, (seconds * 10), barWidth);<br />
            paper.FillRectangle(myBrush, 0, 60, (minutes * 10), barWidth);<br />
        }<br />
    }<br />
}<br />

Mark Brock

Click here to view my blog

modified on Tuesday, April 29, 2008 1:25 AM

MarkBrock wrote:
this.paper = pictureBox1.CreateGraphics();

This still sucks.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )