performClick() - C# Discussion Boards

Khoramdin28-Mar-07 20:28

28-Mar-07 20:28

Hello everyone,

I have a ListView which is populated by a CSV file. Using program I am going to select one of the rows in the ListView.

I have questions and I will be greatfull if someone can tell me how I can achieve it.

Question 1: How can I change the row's color "Similar as when it is clicked by mouse" when the program pick a particular row?

Question 2: The list of data is very long and not all of it can be placed in the ListView window. Is it possible to move the list and make sure the picked row with be somewhere in the middle of the ListView window, visiable to the user?

Thank you very much and have a good day/night.

Khoramdin

Re: Question regarding ListView control?

Saikek29-Mar-07 4:07

Saikek

29-Mar-07 4:07

1) In the listview there is event like ColumnClick. It's parameter (e) is the column number. Try using this parameter with the colum color.
2)Try using property "ListName".AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);

One nation - underground

error in loading application

ArchaBhandare28-Mar-07 19:55

ArchaBhandare

28-Mar-07 19:55

I am using a Symbol device and my application pre-requisites include installing the symbol.all.arm.cab on the device.
The first time I installed the pre-requisites and the application on the device, the application ran properly without any crash.

But later, when I tried to start the application again, there was an error seen and the application did not start.

The following error was seen

TypeLoadException
Could not load type
Symbol.Generic.Reader from assembly Symbol,
Version=1.0.5000.3, Culture=neutral, PublicKeyToken=68EC8DB391F150CA.

MSDN says “TypeLoadException is thrown when the common language runtime cannot find the assembly, the type within the assembly, or cannot load the type.”

I tried reinstalling the ‘symbol.all.arm.cab’ file again, but it gives the same error.

can anyone help me in understanding why am I getting this error and what should I do to correct it.

TCP Checksum Generator

Kr0d28-Mar-07 19:53

Kr0d

28-Mar-07 19:53

Hey all,
I'm writing a program that can modify packets in c#.
Everything is going fine except my TCP checksum generator where it seems to work for some packets but with a few slight changes it generates the wrong thing. It only seems to be doing this when sending packets to my test box, otherwise it works fine.

Could the community please have a look at my code and try and find out what is wrong? i know my programming style Isn't exactly neat although any help would be appreciated.

I pass it the whole packet and it sends back a string of the checksum in hex format.

Cheers
-Glen

<br />
private static string GenerateTCPChecksum(byte[] packet)<br />
{<br />
//Clears the existing checksum<br />
packet[0x32] = 0x00;<br />
packet[0x33] = 0x00;<br />
<br />
int sum = 0;<br />
//Gets the IP header length<br />
string ipHeaderLength = Convert.ToString(packet[0x0e], 16);<br />
ipHeaderLength = "" + ipHeaderLength[1];<br />
//Gets the packet size not including the ethernet part<br />
int packetSize = Convert.ToInt32(Convert.ToString(packet[0x10], 16).PadLeft(2, '0') +<br />
Convert.ToString(packet[0x11], 16).PadLeft(2, '0'), 16);<br />
//TCP packet size<br />
int length = packetSize - (Int32.Parse(ipHeaderLength) * 4); //TCP packet size<br />
<br />
//Adds up the whole TCP packet<br />
for (int i = 0x22; i < packet.Length; i++)<br />
{<br />
try<br />
{<br />
sum = sum + Convert.ToInt32(Convert.ToString(packet, 16).PadLeft(2, '0') +<br />
Convert.ToString(packet[i + 1], 16).PadLeft(2, '0'), 16);<br />
}<br />
catch (IndexOutOfRangeException)<br />
{<br />
sum = sum + Convert.ToInt32(Convert.ToString(packet, 16).PadLeft(2, '0') + "00", 16);<br />
}<br />
i++;<br />
}<br />
<br />
//Adds the psudoheader which is the IP addresses, protocol (TCP) and length<br />
sum = sum + (Convert.ToInt32(Convert.ToString(packet[0x1a], 16).PadLeft(2, '0') +<br />
Convert.ToString(packet[0x1b], 16).PadLeft(2, '0'), 16)) +<br />
(Convert.ToInt32(Convert.ToString(packet[0x1c], 16).PadLeft(2, '0') +<br />
Convert.ToString(packet[0x1d], 16).PadLeft(2, '0'), 16)) +<br />
(Convert.ToInt32(Convert.ToString(packet[0x1e], 16).PadLeft(2, '0') +<br />
Convert.ToString(packet[0x1f], 16).PadLeft(2, '0'), 16)) +<br />
(Convert.ToInt32(Convert.ToString(packet[0x20], 16).PadLeft(2, '0') +<br />
Convert.ToString(packet[0x21], 16).PadLeft(2, '0'), 16)) +<br />
0x06 + length;<br />
string s = Convert.ToString(sum, 16);<br />
string carry = "00";<br />
//Seperates carry and the rest<br />
if (s.Length >= 5)<br />
{<br />
carry = s.Substring(0, s.Length - 4);<br />
s = s.Substring(s.Length - 4, 4);<br />
}<br />
//Adds the carry to the rest<br />
sum = Convert.ToInt32(s, 16);<br />
sum = sum + Convert.ToInt32(carry, 16);<br />
//Inverts number(one's complement)<br />
sum = 0xffff - sum;<br />
s = Convert.ToString(sum, 16).PadLeft(4, '0');<br />
return s; //Returns a string representation of the hex checksum<br />
}

I have an issue on ZedGraph Control

pashitech28-Mar-07 19:03

pashitech

28-Mar-07 19:03

Hi all,

I am using the zedgraph control in my current project in which i am using zedgraph as a graphing area,
here i am plotting the line graph dynamically(ie., when the user clicks on the graph pane the points r created and the graph is drawn). According to our project requirement if the user selects a point it should be highlighted by dispalying a different color for that point so i am repainting the graph with a different color of the selected point this works fine but when selecting more than one point all selected points should be highlighted wher i am facing the problem. when i am passing all the selected points index and trying to highlight them its is working but on mouse click i am unable to get the desired o/p may b some where it is repainting i think.

Thanx in advance

prashanth

Re: I have an issue on ZedGraph Control

Pete O'Hanlon28-Mar-07 22:14

Pete O'Hanlon

28-Mar-07 22:14

I'm guessing that you should post this against the article on ZedGraph. The author is probably your best bet for answering this one.

Deja View - the feeling that you've seen this post before.

Form Control or Component, Delete, Property Notification [modified]

Cnight Stalker28-Mar-07 19:00

Cnight Stalker

28-Mar-07 19:00

I want a DataGridView property in my UserControl:

C#<br />
<br />
public DataGridView _DataGridView<br />
<br />
[Category("Data"), DefaultValue(null)] <br />
public DataGridView DataGridView<br />
{<br />
	get { return _DataGridView; }<br />
	set { _DataGridView = value; }<br />
}<br />

I put the user control on a form, and this property shows (none) by default. I assign a dataGridView1 to the property.

But, when I delete dataGridView1, the property does not revert to (none). I can even still press the [+] and traverse as if the property was still referring to something.

I've looked everywhere (documentation, msdn, and searched the web) for any example demonstrating how to define a property to exhibiting the correct behavior.

The correct behaviour is exhibited by the ContextMenuStrip property of a Control, where it reverts to (none) when a contextMenuStrip1 is assigned to it and then deleted.

I'm new hear, so please forgive me if this query's been resolved, and point me in the right direction.

Thank you for your attention,

S

-- modified at 14:54 Thursday 29th March, 2007

performClick()

quick228-Mar-07 18:36

quick2

28-Mar-07 18:36

Is there a similar method for a toolbarbutton?

Re: performClick()

giddy_guitarist31-Mar-07 5:38

giddy_guitarist

31-Mar-07 5:38

The toolbar button (ToolStripButton) works just like a regular button.

Check for its events in the object browser or reflector.

ToolStripButton myToolbarButton1 = new ToolStripButton();
toolStripMain.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
myToolbarButton1,myToolbarButton2.... etc } );

this.myToolbarButton1.Click += new System.EventHandler(this.myToolbarButton1_Click);

Hope i helped.

Gideon

XML File processing

satsumatable28-Mar-07 17:27

satsumatable

28-Mar-07 17:27

Hi
I have a XML file processing in C# as part of my project, it takes more time to process in some system even though system configuration is same (including free memory space and all). Does and any other factors affect this? Like XML versions or anything?

Please let me know...

How to add Restart Dialog to Installer

remex_1980_junyongwu28-Mar-07 17:13

remex_1980_junyongwu

28-Mar-07 17:13

Hi All,

Is there anyone who knows how to add a Restart Machine Dialog to installer.

I'm using the Setup Projcet in Visual Studio 2005.
I want the dialog can show after the installer.

Counld you help me?

Snippets

Mike Hankey28-Mar-07 17:07

Mike Hankey

28-Mar-07 17:07

I recently attended a VB (yes VB, so I could get a free version of VS2005 standard) and in the toolbox there was a snippet manager where you could drag snippets from there an introduce into code. How was this done? I've done some research but couldn't find anything.

Thanks
Mike

Everybody gotta be somebody

How to reconnect to the server when the ethernet cable unplugged and replugged using Socket

engsrini28-Mar-07 16:34

engsrini

28-Mar-07 16:34

Hi
I am developing a windows applicaiton which is a client and connected with a server(a 3rd party tool developed in Labview) thru TCP socket. Communication is ok but when i unplugg the ethernet, the server is still indicating the client is connected. when i replugg the ethernet cable in the client side, im have done shutdown, close of socket and trying to re-establish the connection. But i could not make the conncetion the Socket.Beginconnect throwing the exception.

How to handle this situation..

can server detect the client availablity if the ethernet cable unplugged at client side?

I can't modify that server code, Is it possible to do something at client side to reconnect it to server?

I have tried Networkavailablitychange class, but no use..

Please post some sample code or links, that would be really help full please..

Thanks
Srini

how to use the a interface declared in a dll

goldli28-Mar-07 16:21

goldli

28-Mar-07 16:21

there are interfaces declared in a dll below
-------------------- Encrypt.dll -------------------------
interface IDESCoder
{
string CreateCode(string IVString,string KeyString,string StringToEncode);
string GetCode(string IVString, string KeyString, string StringToDecode);
}

interface IMD5Encoder
{
string CreateCode(string StringToEncode);
}

public class ClsDES : IDESCoder
{
public string CreateCode(string IVString, string KeyString, string StringToEncode)
{

}

public string GetCode(string IVString, string KeyString, string StringToDecode)
{

}

private Boolean CheckIVKey(string IVString, string KeyString, string StringToEncode)
{

}
}

public class CldMD5 : IMD5Encoder
{
public string CreateCode(string StringToEncode)
{

}
}
-----------------------------------------------------------------------
and there is a Host
-------------------- test.exe ----------------------------------------
string filepath = @"E:\Encrypt.dll";
Assembly myDllAssembly = Assembly.LoadFrom(filepath);
Type dllType = myDllAssembly.GetType("IDESCoder");
if (dllType!=null)
{
......??????
}
-------------------------------------------------------------------------
then,what should i do next with Reflection if i want to use Interface declared in the dll??

Re: how to use the a interface declared in a dll

wulixu28-Mar-07 17:31

wulixu

28-Mar-07 17:31

string filepath = @"E:\Encrypt.dll";
Assembly myDllAssembly = Assembly.LoadFrom(filepath);
Type dllTypeInterface = myDllAssembly.GetType("IDESCoder");//this statement may have some question
Type dllTypeClass = myDllAssembly.GetType("ClsDES");//this statement may have some question
if (dllType!=null)
{
//TODO---you can use Factory pattern to improve it
dllTypeInterface interf=Activator.CreateInstance(dllTypeClass );
}

and you can choose another simpler way to resolve the problem.
first of all,You should Add references into your application in VS.NET.
then you can use it like using some interface or class in mscorlib.dll.
for example. using System.Int32;

It is very useful for everyone to show your own ideas to others.---Discussion is the power of improvement.

Re: how to use the a interface declared in a dll [modified]

goldli28-Mar-07 19:15

goldli

28-Mar-07 19:15

i know the way you said, and, you see , if i just know the interface'name ,can i have the dllTypeInterface object?

"Attempted to read or write protected memory."

User 137680028-Mar-07 14:58

User 1376800

28-Mar-07 14:58

Hi all,
I am trying to use a DLL that modifies a stream of bytes (basically it's an encryption/decryption DLL). This DLL comes from a third party and I have to use it "as is". It wasn't designed for C#, but I really don't see any reason I shouldn't be able to use it.
The DLL reads and writes to a byte array (reads encrypted data, writes decrypted data), and this is giving me the error "Attempted to read or write protected memory."
I think the problem is quite simply that I don't understand how C# handles this kind of thing, so was wondering if I could get a little help.
The code goes something like this:

<br />
[DllImport("ABCdecrypt.dll", EntryPoint = "ABCdecrypt", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]<br />
unsafe public static extern bool ABCdecrypt([MarshalAs(UnmanagedType.I4)] int type, byte* data, int datalength);<br />
<br />
private void buttonGo_Click(object sender, EventArgs e)<br />
{<br />
    byte[] yData = File.ReadAllBytes(textBoxInput.Text); //This is a filename<br />
    unsafe<br />
    {<br />
        fixed (byte* pBuf = &yData[0])<br />
        {<br />
            ABCdecrypt(100, pBuf, yData.Length); //This is where it fails<br />
            File.WriteAllBytes(textBoxOutput.Text, yData); //This is a filename<br />
        }<br />
    }<br />
    MessageBox.Show("Done");<br />
}<br />

If I'm not being clear, please ask me to clarify. Essentially, all I want to do is use the library to decrypt the file referred to by textBoxInput.Text and save it out as the file referred to by textBoxOutput.Text

Re: "Attempted to read or write protected memory."

Dewald30-Mar-07 23:25

Dewald

30-Mar-07 23:25

Hi YttriumOxide,

I've been struggling with something very similar recently. You can read my question here[^]:

I seem to have found an answer and it turned out to be far simpler than I thought it was going to be. Having said that, I might still be doing something wrong which will come back to bite me later but for now I seem to be OK and on my way.

What I did different from you was not to pass a pointer to the byte array as a parameter to the function but the byte array itself. I did not even do it in an unsafe block (which I probably should) but it worked.

So, leaving your declaration of your function unchanged (where you import it from the DLL), I would have called it like this:
ABCdecrypt(100, yData, yData.Length);

I have to stress though that I am by no means an expert in this field. I'm only just starting to meddle in C# and I haven't the faintest clue about marshalling. By the way, why did you marshal your first parameter as UnmanagedType.I4? And why did you not marshal the other two parameters? Do you know of any sites where I can read up on the MarshalAs attribute when used in this context?

Good luck

Windows Forms book suggestions?

Mark J. Miller28-Mar-07 12:11

Mark J. Miller

28-Mar-07 12:11

I am a C# programmer with mostly ASP.NET experience. I have done very little Win32 (WinForms) programming. Any suggestions for a good book on Windows Forms? I don't mean a general C# or .NET book, but one that specifically addresses the topic of Windows Forms.

Re: Windows Forms book suggestions?

J$28-Mar-07 12:54

28-Mar-07 12:54

I use this one at work, and it is pretty good.

Edit: Sorry, just noticed you said not specifically for C#.

Re: Windows Forms book suggestions?

Mark J. Miller28-Mar-07 13:30

Mark J. Miller

28-Mar-07 13:30

No, your answer is great - I don't want a VB book, I want a C# one. What I meant was I don't want a C# book on General .NET. I want a C# book written specifically for windows forms, and that's exactly what you found.

Thanks

Re: Windows Forms book suggestions?

Mike Hankey28-Mar-07 13:32

Mike Hankey

28-Mar-07 13:32

I use "Windows Forms Programming in C#" by Chris Sells....Excellent book.
Theres a version for .NET 2.0 out now also.

Hope that helps
Mike

Everybody gotta be somebody

Re: Windows Forms book suggestions?

Scott Dorman28-Mar-07 13:36

Scott Dorman

28-Mar-07 13:36

Definately this one:

Windows Forms 2.0 Programming (2nd Edition) (Microsoft .NET Development Series) by Chris Sells and Michael Weinhardt[^]

-----------------------------
In just two days, tomorrow will be yesterday.

Re: Windows Forms book suggestions?

Rudolf Jan29-Mar-07 0:41

Rudolf Jan

29-Mar-07 0:41

I used Charles Petzolds book on Forms programming, but I am not very happy with it. It gives a very global overview and he refues to use the IDE functions, which are really great help when trying to create forms.

Petzold gives a lot of attention to the use of panels. However, panels have serious disadvantages. For a more complex form with, say 10 controls, you need a lot of panels. This makes maintenance a hell. So I decided to stop using panels.

Petzold gives very little attention to important but complex controls like listboxes and listviews. I think this very dissappointing.

accessing a remote gateway/box

mfmaneef28-Mar-07 10:42

mfmaneef

28-Mar-07 10:42

hi guys,

how do i connect to a gateway using csharp and get its output so taht i can manipulate them...

as im a biginner in csharp 1 idea i had was uusing telnet and get the data..

is there any good solutions for this??

aneef

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