C# Discussion Boards - CodeProject

SimpleData28-Jan-09 5:29

28-Jan-09 5:29

I couldn't exactly understand what you are trying to mean. Are you trying to say that I am making a keylogger-like application. This is just a anti-cheating application like X-ray Anti-Cheat. You can access the pictures it takes from http://www.xraygaming.com/

Or maybe I understood your message wrong Smile | :)

Re: JPEG Compression in C#

Ennis Ray Lynch, Jr.28-Jan-09 5:42

Ennis Ray Lynch, Jr.

28-Jan-09 5:42

I am trying to see if you are screen capturing your application and sending it to a server to check for cheating you could hash a particular part of the screen to check for cheating instead of uploading the entire screen.

Besides, uploading an entire screen shot is unethical and so is key logging.

Need software developed? Offering C# development all over the United States, ERL GLOBAL, Inc is the only call you will have to make.

If you don't ask questions the answers won't stand in your way.

Most of this sig is for Google, not ego.

Re: JPEG Compression in C#

SimpleData28-Jan-09 6:02

SimpleData

28-Jan-09 6:02

My application only captures the screen when the game is open. Uploading the entire screen is unethical only when the user doesn't know what the application is doing.

You can see cheater's screenshots here:
http://www.xraygaming.com/index.php?pageid=gallery[^]

So I can't check for cheating by hashing a particular part of the screen. Because it always changes.

Re: JPEG Compression in C#

Mark Churchill28-Jan-09 12:11

Mark Churchill

28-Jan-09 12:11

Yeah its pretty naive anti-cheat used in private enthusiast gaming ladders. The condition of playing in their ranked matches is that you run the client, which randomly uploads screenshots of your game so you can prove you don't have transparant walls or other cheats.

They always end up failing, as they are trivial to work around... eg Novacap, Octinium, CEVO's client...

The done thing seems to be re-implementing them in the same way, and look surprised when they get defeated Wink | ;)

Mark Churchill
Director, Dunn & Churchill Pty Ltd
Free Download: Diamond Binding: The simple, powerful, reliable, and effective data layer toolkit for Visual Studio.

Entanglar: .Net game engine featuring automatic networking and powerful HLSL gfx binding.

C# Clipboard - Works, but is one step behind

Olav Alexander Mjelde28-Jan-09 3:22

Olav Alexander Mjelde

28-Jan-09 3:22

Hi,

I have a problem with my CTRL+C Keylogger.
It's an application which listens (hook) for CTRL+C and if it is triggered, it searches for the clipboard text (if it is text).

It works perfectly, but it is one step behind.
eg. if I have a text: abc def geh
and I first copy abc, nothing happends. If I then copy def, it has abc in the clipboard.

So, then I made this thread on tek-tips and a person there gave me a suggestion that maybe my application triggers too fast (eg. tries to use the clipboard, befire it's filled).

I then tried a thread.sleep(1000)..

This worked (on vista), but not on xp sp3.
Here is the code

if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
    int vkCode = Marshal.ReadInt32(lParam);

    if (Keys.C == (Keys)vkCode && Keys.Control == Control.ModifierKeys)
    {


        Thread.Sleep(1000);

        if (iData.GetDataPresent(DataFormats.Text, true))
        {

            frm2.setSearch(iData.GetData(DataFormats.Text, true).ToString());
        }
    }

}

Olav Alexander Mjelde

Re: C# Clipboard - Works, but is one step behind

User 665828-Jan-09 3:25

User 6658

28-Jan-09 3:25

Olav Alexander Mjelde wrote:

So, then I made this thread on tek-tips and a person there gave me a suggestion that maybe my application triggers too fast (eg. tries to use the clipboard, befire it's filled).

That's correct

Olav Alexander Mjelde wrote:

I then tried a thread.sleep(1000)..

That's a very unreliable way.

Here's the proper way, register yourself as a clipboard viewer and get notified of changes in the clipboard:

http://www.radsoftware.com.au/articles/clipboardmonitor.aspx[^]

regards

modified 12-Sep-18 21:01pm.

Any way to convert/compress JPG to TIFF CCITT Fax4?

Matjaz-xyz28-Jan-09 3:19

Matjaz-xyz

28-Jan-09 3:19

Hi. I googled this but havent found anything usefull. Now, i turn to you. The CP community.

I'd like to convert some JPEG files to TIF and compress them with CCITT Fax 4.
For an example take IrFan View. You open a file in Irfan and then click "Save as...". Irfan has a plugin for this (i guess) in its app. folder\plugins... but dont know which one. Even if i'd know, i dont know how to use .dll files.

So, does anyone know how to convert, i mean, compress a file into CCITT Fax 4 (b&w)?

Thanks in advance!

Regards,
Matjaž

Re: Any way to convert/compress JPG to TIFF CCITT Fax4?

Mark Churchill28-Jan-09 12:40

Mark Churchill

28-Jan-09 12:40

http://www.vbdotnetforums.com/graphics-gdi/19552-group-4-compression-tif.html

Re: Any way to convert/compress JPG to TIFF CCITT Fax4?

Matjaz-xyz28-Jan-09 22:30

Matjaz-xyz

28-Jan-09 22:30

Wow. Thank you Mark! This was really helpful.

Thanks again!!

Regards,
Matjaž

Re: Any way to convert/compress JPG to TIFF CCITT Fax4?

Mark Churchill29-Jan-09 3:40

Mark Churchill

29-Jan-09 3:40

Ah np, i remember seeing the option when I was messing around with TIFFs for some other reason.

Device Drivers

queries36528-Jan-09 3:15

queries365

28-Jan-09 3:15

Hi,
Is it possible to take backup of Device Drivers programatically ?

Regards......

Reading xml that contains reference to xml’s

Ronenb28-Jan-09 3:08

Ronenb

28-Jan-09 3:08

Hi
I would like to read the content of XML in c#
I’ve main XML that contain several include to additional xml

I’m trying to read nodes from main XML but I always got zero,
In case I’m copy the sub XML content to main XML it work

I know I can do include in XML another XML and it should be the same as writing the text in the same XML

What could be the problem?
See code below

Main XML

<tests>
<num_of_tests>4</num_of_tests>
<include href="test_rx25ghz.xml" />
<include href="test_rx35ghz.xml" />
<include href="test_tx25ghz.xml" />
<include href="test_tx35ghz.xml" />
</tests>

SUB XML
<test>
<testname>RX</testname>
<description>RX test on 2.5Ghz</description>
<frequency>250475000</frequency>
</test>

C# code
private XmlDocument m_xDoc;
private XmlElement m_Root;
m_xDoc = new XmlDocument();
m_xDoc.Load(m_mainXMLTest);
m_Root = m_xDoc.DocumentElement;
m_nodeItems = m_Root.GetElementsByTagName("test");

the problem is
m_nodeItems.count = 0

Please advice
Ronen

Struct vs array performance

Lutosław28-Jan-09 2:25

Lutosław

28-Jan-09 2:25

If the performance is critical, what should I choose:
1. A comfortable and flexible solution: an array TSymbol[], where Symbol is a struct {int a, int b} and access it via arr[n].a, arr[n].b
OR
2. Redesign everything and give up a generic class of type <TSymbol>: an array int[][], and access it via arr[n][0], arr[n][1]

In fact I ask about a C# difference between

int[] arr = new int[2];
arr[0], arr[1]

and

Symbol[] s = new Symbol; // s is a struct { a, b }
s.a, s.b

Greetings - Gajatko

Portable.NET is part of DotGNU, a project to build a complete Free Software replacement for .NET - a system that truly belongs to the developers.

Re: Struct vs array performance

SeMartens28-Jan-09 2:44

SeMartens

28-Jan-09 2:44

Hi,

since both (int and structs) are value types, they are stored at the stack. So accessing an int or an struct is an access to the fast stack. So I would say it doesn't matter, but I really don't know it exactly.

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Struct vs array performance

User 665828-Jan-09 3:02

User 6658

28-Jan-09 3:02

SeMartens wrote:
since both (int and structs) are value types, they are stored at the stack.

An array of some (value) types results in a reference type, though.

regards

modified 12-Sep-18 21:01pm.

Re: Struct vs array performance

SeMartens28-Jan-09 3:14

SeMartens

28-Jan-09 3:14

So, let me guess writing [][] (Jagged array) refers to two "different" seperate arrays. Then using the struct would be faster because you are only one array reference instead of two?

Am I totally wrong?

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Struct vs array performance

User 665828-Jan-09 3:23

User 6658

28-Jan-09 3:23

SeMartens wrote:
So, let me guess writing [][] (Jagged array) refers to two "different" seperate arrays.

Actually, a jagged array [n][m] will create n*m arrays.

SeMartens wrote:
Then using the struct would be faster because you are only one array reference instead of two?

MSDN[^] writes a bit about performance of value and reference types. If value types have a lot of members, that it might be better to use a reference to this type using the ref keyword. Of course this is only applicable if you want to allow modification of the value type. Reference types have some GC overhead though.

modified 12-Sep-18 21:01pm.

Re: Struct vs array performance

C Change28-Jan-09 3:09

C Change

28-Jan-09 3:09

Not 100% cetain, but with modern processors and compilers there should be negligible odds. Any given structure is of constant size, and the offset into the structure for any given member is also constant. The array indexing is therefore trivial, and the member offsetting calculable at compile-time. e.g. If iterating in a for loop, it might typically add the struct size onto the index each time, which was originally primed with the address of the member variable in the initial array element.

Re: Struct vs array performance

Ennis Ray Lynch, Jr.28-Jan-09 4:02

Ennis Ray Lynch, Jr.

28-Jan-09 4:02

Do both array and stack :p

http://msdn.microsoft.com/en-us/library/cx9s2sy4(VS.71).aspx[^]

xml data

arkiboys28-Jan-09 1:47

arkiboys

28-Jan-09 1:47

I have made changes to code with the help of another developer...
This code does not seem to be working fine when there are multiple <NODE> tags
Do you see what the problem is please?
The xml is below:
Thanks

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("XMLFile1.xml");

XmlNode bNode = xmlDoc.SelectSingleNode("BIBLE");

string strBibleClientID = xmlDoc.DocumentElement.GetAttribute("CLIENT_ID");
string strBibleMatterID = xmlDoc.DocumentElement.GetAttribute("MATTER_ID");
string strBibleDocNumber = xmlDoc.DocumentElement.GetAttribute("DOCNUMBER");

XmlNodeList nodes = xmlDoc.SelectNodes("/BIBLE/NODE");

foreach (XmlNode node in nodes)
{
XmlNodeList docs = node.SelectNodes("./DOC");

foreach (XmlNode doc in docs)
{
string clientID = doc.Attributes["CLIENT_ID"].Value;
string matterID = doc.Attributes["MATTER_ID"].Value;
string docName = doc.Attributes["DOCNAME"].Value;
string docNumber = doc.Attributes["DOCNUMBER"].Value;
}
}

<?xml version="1.0" encoding="utf-8" ?>
<BIBLE MATTER_ID="00123" CLIENT_ID="12345" DOCNUMBER="65476">
some text here
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="first Document name" DOCNUMBER="12346">
</DOC>
<NODE>
<![CDATA[some text:]]>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="another name" DOCNUMBER="12346A">
</DOC>
</NODE>

<NODE>
<![CDATA[Authorisations:]]>
<NODE><![CDATA[something:]]>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="second document name" DOCNUMBER="12347">
</DOC>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="third document name" DOCNUMBER="12348">
</DOC>
</NODE>
</NODE>
<NODE>
<![CDATA[ok data:]]>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="a name here" DOCNUMBER="12345">
</DOC>
</NODE>
</BIBLE>

Re: xml data

SeMartens28-Jan-09 1:51

SeMartens

28-Jan-09 1:51

Hi,

maybe you have to use "//DOC" instead of "./DOC"?

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: xml data

arkiboys28-Jan-09 2:01

arkiboys

28-Jan-09 2:01

Many thanks

UML Modelling of C# / .NET Windows Apps?

C Change28-Jan-09 0:28

C Change

28-Jan-09 0:28

I'm in the process of learning C#/.NET & UML, having previously done many years of embedded C/C++, with a smidgen of UML and VS6/MFC. I'm doing a home project, and can now at least put *simple* windows apps together. I want to now do a good object oriented design for a C# project - I've got Visual Paradigm for UML to help me here.

The problem I have is this: How best to model in an OOD the windows infrastructure elements of the design:-
* GUI components. Forms, buttons, text windows, etc etc.
* Event handlers. Being event-drive they just "pop up from nowhere" and then disappear again.
* How the underlying infrastructure knits it all together.

I can imagine that if I have a "PressMeHere" button, then it would be an object having a "PressMeHere_ButtonClick" event handler as one of its public methods, but it would be nice to see what it is in the system that invokes this method, and how the major .NET components interact.

Can anyone point me to a UML modelling of a typical .NET Windows application? Something that clearly identifies the demarcation between .NET/Windows infrastructure, versus application. I'd be very grateful if anyone can.

modified on Wednesday, January 28, 2009 9:10 AM

Downloadfile issue from server

ashok_rgm28-Jan-09 0:15

ashok_rgm

28-Jan-09 0:15

Hello All,

Here I have a problem with downloading a file.

I have a file "Sample.dat" of 600Mb in my IIS root directory.
Now I have a client application to download file to local drive.

am using DownloadFileAsync(URI,file);

it takes 2 mins to download the complete file but while downloading the file if delete the source file in server it is still getting downloaded, how is it possible?
Confused | :confused:

ashok

Re: Downloadfile issue from server

Manas Bhardwaj28-Jan-09 0:28

Manas Bhardwaj

28-Jan-09 0:28

ashok_rgm wrote:
it takes 2 mins to download the complete file

2 mins for 600 MB. Confused | :confused:

Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.