Re: compare pictures of different sizes - C# Discussion Boards

Re: How to improve .net app performance ?

Pete O'Hanlon15-Jun-09 12:09

15-Jun-09 12:09

If I were you, I'd profile the application looking to see where the "slowdowns" actually are. You can ngen all you like, but if you're performing unnecessary work, this isn't going to help you in any way.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

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compare pictures of different sizes [modified]

netDeveloper15-Jun-09 10:35

netDeveloper

15-Jun-09 10:35

Hi,

I need to create a small program that removes duplicates of same picture, but by duplicate I mean that one picture can be a wallpaper and the other one a very small picture, both being "identical". Any ideas?
Thanks

modified on Monday, June 15, 2009 5:05 PM

Re: compare pictures of different sizes

I Believe In GOD15-Jun-09 10:43

I Believe In GOD

15-Jun-09 10:43

Do you mean (Same Image AND Different Size) ? are Identical ?

I know nothing , I know nothing ...

Re: compare pictures of different sizes

netDeveloper15-Jun-09 10:44

netDeveloper

15-Jun-09 10:44

Yes, same image in different sizes

Re: compare pictures of different sizes

Luc Pattyn15-Jun-09 10:45

Luc Pattyn

15-Jun-09 10:45

identical as in tiger == cat ?

Smile | :)

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Re: compare pictures of different sizes

netDeveloper15-Jun-09 10:53

netDeveloper

15-Jun-09 10:53

Not sure what you mean by that. I mean that for example, you have an wallpaper size image whih was shrinked using some tool. Is it possible to compare them?

Re: compare pictures of different sizes

Luc Pattyn15-Jun-09 10:58

Luc Pattyn

15-Jun-09 10:58

You will have to decide for yourself when you call two images identical.

Here is one possibility:
- shrink the larger one to the size of the smaller one;
- now you have to images of identical size; iterate over all pixels in both, calculate the pixel difference, and make a histogram of that deviation.
Pixel difference could be (red1-red2)^2 + (blue1-blue2)^2 + (green1-green2)^2 or something similar.
Then apply some criterium on the histogram to judge equality.

Drawbacks:
1. this will not be fast;
2. the shrink you apply may be somewhat different from the original shrink;
3. the algorithm will fail if one picture is a shrink of only a (large) part of the other

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

Re: compare pictures of different sizes

I Believe In GOD15-Jun-09 12:01

I Believe In GOD

15-Jun-09 12:01

I always found my self , at the voting button every time I read an answer for you ...

please kindly accept respect.

Kind regards .... Rose | [Rose]

I know nothing , I know nothing ...

Re: compare pictures of different sizes [modified]

Luc Pattyn15-Jun-09 12:04

Luc Pattyn

15-Jun-09 12:04

Thanks for the kind words, not sure how they fit together with a 1-vote though.

Confused | :confused:

[EDIT]That's better![/EDIT]

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modified on Monday, June 15, 2009 6:11 PM

Re: compare pictures of different sizes

I Believe In GOD15-Jun-09 12:11

I Believe In GOD

15-Jun-09 12:11

I thought Vote 1 = is Number 1 = 1st = The Top D'Oh! | :doh:

any way I fixed that Poke tongue | ;-P

I know nothing , I know nothing ...

Re: compare pictures of different sizes

Luc Pattyn15-Jun-09 12:42

Luc Pattyn

15-Jun-09 12:42

the thumbs up/down icons may guide you in the right direction.

Big Grin | :-D

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Word automation - selecting a part of the document

dptalt15-Jun-09 8:56

dptalt

15-Jun-09 8:56

I'm using Word automation to open a document that has some areas protected. I'm trying to figure out how to select the unprotected area of the document. How can this be done?

As a solution I recorded a macro inside Word that presses F8 five times which selects the unprotected section as I want. The marco code shows the following:

Selection.Extend
Selection.Extend
Selection.Extend
Selection.Extend
Selection.Extend

What is the syntex in C# if I wanted to use Selection.Extend?

Re: Word automation - selecting a part of the document

led mike15-Jun-09 9:57

led mike

15-Jun-09 9:57

dptalt wrote:
What is the syntex in C# if I wanted to use Selection.Extend?

http://msdn.microsoft.com/en-us/library/microsoft.office.interop.word.selection.extend(office.11).aspx[^]

Re: Word automation - selecting a part of the document

dptalt15-Jun-09 10:09

dptalt

15-Jun-09 10:09

That link does not give me enough information to solve my problem.

Re: Word automation - selecting a part of the document

led mike15-Jun-09 10:25

led mike

15-Jun-09 10:25

Ok, sorry, I guess I was wrong. I won't bother you any more.

Re: Word automation - selecting a part of the document

DidiKunz15-Jun-09 22:16

DidiKunz

15-Jun-09 22:16

dptalt wrote:
That link does not give me enough information to solve my problem.

You probably read something about office automation, then it would.

Application that modifies packets read from an Ethernet card

mouthpiec15-Jun-09 8:49

mouthpiec

15-Jun-09 8:49

Hi all,

I need a small tip on the following;

I have an assignment were I need to create a sort of a server on which I will have an application running (which application has to be created by myself). This application should be able to read the packets received on the server ethernet card, manipulate the packets (the actual bits) and output the modified packets on another ethernet card (or if possible the same card used as input).

I need some feedback if it is possible to create such an application, which will be able to perform such job, and if possible, how difficult it is to make (is there any ready to use dll files or classes that can perform parts of this job like for example reading and writing to/from the ethernet card?)

Hel from your side will be greatly appreciated.
regards
sandro

Re: Application that modifies packets read from an Ethernet card

Henry Minute15-Jun-09 11:34

Henry Minute

15-Jun-09 11:34

Your question has been sitting there for some time with no response.

There are several reasons for this.

1) You say this is an assignment. That makes it sound like homework but you have not indicated what, if any, research you have done. No one here is likely to do your homework for you.

2) The whole concept sounds highly suspicious. The sort of thing that a malicious program might do. I'm not suggesting that it is, but you do nothing to dispel that impression.

So do some research for yourself. Find something that you can adapt or copy and have a go. When you get problems with a specific part of your code, please come back, with code snippets, details of any errors (including precise error messages) or behavioural problems.

Good Luck! Smile | :)

Henry Minute

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Re: Application that modifies packets read from an Ethernet card

mouthpiec15-Jun-09 21:13

mouthpiec

15-Jun-09 21:13

thanks for the tips Henry!

By assignment I meant that I need to perform some research, and the whole concept of the program is that I convert from a particular SCCP protocol to another SCCP protocol.

I posted this question not to have any particular code but to have some feedback if this program is doable by using C#.

thanks again

Get Checked value of a checkBox from thread different of the UI thread

Zeokat15-Jun-09 7:20

Zeokat

15-Jun-09 7:20

Well i know that i can´t play directly with values of winforms from different thread of the UI thread.

But i have a thread and i need to obtain the value of a checkbox from that thread... how can i obtain the value??

Thanks in advance. Smile | :)

Re: Get Checked value of a checkBox from thread different of the UI thread

I Believe In GOD15-Jun-09 8:36

I Believe In GOD

15-Jun-09 8:36

Create a Class "cls" :

class MyCls
   {
       public static bool MyCheckBoxValue;
   }

and change this variable from your forms by call it like this :

MyCls.MyCheckBoxValue = true;

bool mybal = MyCls.MyCheckBoxValue;

I know nothing , I know nothing ...

Re: Get Checked value of a checkBox from thread different of the UI thread

Luc Pattyn15-Jun-09 8:57

Luc Pattyn

15-Jun-09 8:57

Hi,

for minimal run-time cost, give the Form that holds the CheckBox:
1. a private bool holding the state of the checkbox;
2. a CheckBox_CheckedChanged event handler, updating said variable;
3. a public property to get the value of said variable.

this set-up avoids the need for Control.Invoke

PS: don't forget to copy the initial CheckBox.Checked value in your form's constructor.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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Re: Get Checked value of a checkBox from thread different of the UI thread

hwswin15-Jun-09 15:48

hwswin

15-Jun-09 15:48

I have an other Thread t,and I can get the checkbox value from UI thread in Thread t.
see follow source code.

private void Form2_Load(object sender, EventArgs e)
{
    Thread t = new Thread(new ThreadStart(deal));
    t.Name = "deal";
    t.IsBackground = true;
    t.Start();
}

void deal()
{
    while (true)
    {
        System.Diagnostics.Debug.WriteLine(checkBox1.Checked);
        Thread.Sleep(1000);
    }
}

Accessing an array from another function ?

Jasmine Pomelo15-Jun-09 6:36

Jasmine Pomelo

15-Jun-09 6:36

private void LoadSettings()
       {
           string[] lines = File.ReadAllLines("settings.txt");
           foreach (string line in lines)
               {
                   if (line == "" || line.StartsWith(" ") || line.StartsWith("/")) continue; // ignore comments or blank lines
                   string[] splitArray = line.Split(new char[] { '=' });
                   MessageBox.Show(splitArray[1]);
             }
             MessageBox.Show(splitArray[1]);
       }

Im having a problem with the code above the array splitArray can be accessed inside the for-each loop but i get a ide exception if i try to access it anywhere else . Is there any way to make the array items available anywhere in the form ?

Re: Accessing an array from another function ?

dan!sh 15-Jun-09 6:43

dan!sh

15-Jun-09 6:43

Make it a class level variable.

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