Re: Webcam QR Barcode Decoder Problem - C# Discussion Boards

Christian Graus21-Jun-09 21:11

21-Jun-09 21:11

pretty simple really. Your picture is not going to be 100% without noise, 100% taken at the right angle, etc.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

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S K Y21-Jun-09 21:44

S K Y

21-Jun-09 21:44

hi Christian Graus
but i saw some sample applications can run n mobile phones. those application don't have that problem. how can i solve this problem??? any tips...???

A S E L A

Dave Kreskowiak22-Jun-09 3:26

Dave Kreskowiak

22-Jun-09 3:26

Do some image processing on the picture to increase the contrast and flatten the colors out so you get a more consistent black and white images. Then send the processed image to your decoder.

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

OriginalGriff22-Jun-09 6:12

OriginalGriff

22-Jun-09 6:12

Right, this is going to need you to do some work:
First, read the QR barcode spec: QR 2005 barcode specification[^] - then you will know what you are trying to do.
Second, the problem is likely to be resolution related, as the squares need to be pretty uniform and "pretty". Best method is to process several frames from the camera and build up the barcode format in memory from the various frames until you have a "good" image (this is how most scanners work - build an image from a number of scans, rather than a single scan). Keep building until the "compulsary" parts of the image are readable, and hopefully you will have the entire barcode.
Good luck!

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btss016-Aug-10 0:39

btss01

6-Aug-10 0:39

Hi I just gone through your thread posted on codeproject.
If you fond the solution of this problem then please share with me.
Regards,
Bhavesh Rajdeep

OriginalGriff6-Aug-10 0:47

OriginalGriff

6-Aug-10 0:47

What part of my answer did you not bother to read? The solution is given - but you will have to implement it. I don't need to read barcodes on my mobile...

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

shut down client from server

btss0110-Aug-10 0:45

btss01

10-Aug-10 0:45

Hi OriginalGriff,

I want to scan barcode through webcam attached to my computer.
If you have code for that then please email me or post it in this thread or pass the URL.
Thanks in Advance.

KIDYA21-Jun-09 19:44

KIDYA

21-Jun-09 19:44

hello Experts!!

I want to shut down client computer from server side.i am using vb.net

help!! Sigh | :sigh:

Christian Graus21-Jun-09 21:12

21-Jun-09 21:12

What sort of client ? over the web, through an online app you wrote, or what ?

KIDYA21-Jun-09 21:48

KIDYA

21-Jun-09 21:48

not over the web,its on pc.

Christian Graus21-Jun-09 21:13

21-Jun-09 21:13

KIDYA wrote:
.i am using vb.net

Just to add - then why did you ask in the C# forum ?

EliottA22-Jun-09 2:46

EliottA

22-Jun-09 2:46

Don't know who 1'ed you but I tried to balance it out.

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Loading Dlls programatically in C#

EliottA22-Jun-09 2:35

EliottA

22-Jun-09 2:35

Same method as if you used C#, call shutdown.exe using the System.Diagnostics.Process class.

Check out the CodeProject forum Guidelines[^]
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Tina P21-Jun-09 19:05

Tina P

21-Jun-09 19:05

Hey guys,

I need to be able to figure out (based on users selection from the UI) which class library project to use. In other words, there is a mthod lets say initialize or something that would be receiving some parameters from the User (such as the name of the class library project and it's type, however the name is enough to have some sort of a if else block and load the right project. Well actually I wanna be careful here, it's not really loading the class library project from here, it's more like using the correct project for all the subsequent method calls from this project (as the class library projects may or maynot be different from each other in terms of the methods they define.

So I need to be able to point this project, which also happens to be a Class library project to the correct version of the subsequent project based on the name of the project that is provided by the user from the UI text box.

I'm sure whats the ideal solution here, I think I should just add a reference dynamically based on the project name coming in....in other words do some sort of string comparison adn based on that add a reference to the right Class library project adn then it will point to it.

can someone please help me with this, if you think this isn't what needs to happen, or if it is the right approach, any feedback would be highly appreciated?

Thanks
Tina

Re: Loading Dlls programatically in C#

himanshu256121-Jun-09 21:22

himanshu2561

21-Jun-09 21:22

Hi,
I think you might need to look for Reflection to achieve this.

himanshu

Re: Loading Dlls programatically in C#

Shukla Rahul21-Jun-09 22:17

Shukla Rahul

21-Jun-09 22:17

Hi Tina,

I would suggest you to go with a event subscription based model to achieve this.
Please see Observer Pattern for details.
Make one project for Subject & Define all the other dll projects as observers. Let me know if you want to see a working code of it.

Regards,
Rahul Shukla

Getting array of Numbers.

Sangram_KP21-Jun-09 17:35

Sangram_KP

21-Jun-09 17:35

Hi,

I have numbers 1 to n(let it be 1 to 10).. They are in sequence and in ascending order but some of the numbers in between are missing. For example(1 2 3 5 6 9 10).

I need arrays from the numbers those are in sequence.

Like:
Array1: [1,2,3]
Array2: [5,6]
Array3: [9,10]

Note: It is also needed to calculate how many arrays we can get?

Can some body please help.

Christian Graus21-Jun-09 19:32

21-Jun-09 19:32

Well, sounds like you need to write some code. You have to step through until a number is not the next in sequence, then start a new array. You can build a list and call ToArray to make your arrays as you go.

Sangram_KP21-Jun-09 20:03

Sangram_KP

21-Jun-09 20:03

The problem is implementing, the logic u have given.
can u help me with sample code.

Christian Graus21-Jun-09 21:15

21-Jun-09 21:15

Well, the code someone gave you, doesn't look to me like it will work, but it should give you enough of a start to be able to do your own homework.

himanshu256121-Jun-09 21:30

himanshu2561

21-Jun-09 21:30

Hi Christian
Code is working $Shucks | :-\$

himanshu

CPallini21-Jun-09 20:48

CPallini

21-Jun-09 20:48

Christian Graus wrote:
Well, sounds like you need to write some code.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
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himanshu256121-Jun-09 20:44

himanshu2561

21-Jun-09 20:44

Hi,
This might help you.

List<int> al = new List<int>();
       al.Add(1);
       al.Add(2);
       al.Add(3);
       al.Add(5);
       al.Add(6);
       al.Add(11);
       al.Add(12);
       al.Add(13);
       al.Add(21);
       al.Add(22);
       int x = 0;
    List<int>[] ll=new List<int>[al.Count];
    ll[x] = new List<int>();
       for(int i=0;i<al.Count;i++)
       {
           if ((i + 1) == al.Count)
           {
               if (al[i]  == al[i- 1]+1)
               {
                   ll[x].Add(al[i]);
               }

           }
           else
           {
               if (al[i] + 1 == al[i + 1])
               {
                   ll[x].Add(al[i]);
               }
               else
               {
                   ll[x].Add(al[i]);
                   x = x + 1;
                   ll[x] = new List<int>();
               }
           }
       }
       Array aa = ll.ToArray(); ;

himanshu