Data grid clinet behavior? - C# Discussion Boards

exhaulted9-Jun-05 4:05

9-Jun-05 4:05

Hi all,

I have a DataTable object and the 4th column has DateTime objects stored in it.
To get at the DateTimes i am doing the following.

DateTime dt;<br />
<br />
for (int x = 0; x < Table.Rows.Count; x++)<br />
{<br />
    dt = (DateTime)Table.Rows[x].ItemArray[3]<br />
    .....<br />
    Some other code here<br />
    .....<br />
}

Is there any way of getting at the DateTime object in the column without casting?
This is my biggest overhead by far in the method which is fine for a few hundred iterations
but sometimes i am going through tens of thousands of iterations and it's a tad slow.

Anyone able to help??

Cheers

Kev

Re: Data in DataTables

Robert Rohde9-Jun-05 8:42

Robert Rohde

9-Jun-05 8:42

When using the DataTable you will have to do the casting. One solution would be to take another data structure. You should also try not taking the ItemArray property as I think it produces a bit overhead (Im not 100% in this):

DateTime dt;

for (int x = 0; x < Table.Rows.Count; x++)
{
dt = (DateTime)Table.Rows[x][3]
.....
Some other code here
.....
}

Get IP Address

Anonymous9-Jun-05 3:36

Anonymous

9-Jun-05 3:36

Say someone wanted to write an application that would get the ip address, like an IP Updater. I have found various examples on the how-to of getting this information using the .NET dns class but here is the problem - how do you get the public ip address of a machine when it is behind a router? The using of the .NET dns class, in my experience, will retrieve the local ip address, thus the 192.168.1.X address, not the public ip address of 66.xxx.xxx.xxx. How can I retrieve the public ip address?

Re: Get IP Address

leppie9-Jun-05 3:46

leppie

9-Jun-05 3:46

Best is to use a webserver/service, and get the client to access that. That will give you the last public IP.

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: Get IP Address

Dave Kreskowiak9-Jun-05 8:16

Dave Kreskowiak

9-Jun-05 8:16

Your machine doesn't have a "public" IP address. It only has the address assigned by your router.

Like leppie said, you can use an Internet webservice or website that tells you what your routers WAN address is because it's your router that make requests for your machines, kind of like a proxy. The address returned will be the same for all computers on your network because the address doesn't belong to any one machine, it belongs to the WAN side of your router, or you can think of it as your network's address.

Or, you can use the hostname and domain that was assigned to you by your ISP, if available (check your paperwork) and DNS resolve that.

Another option would be to query your router for that information. You can either write yourself an automated Telnet client that talks to the router, or your could write up something to do it through the routers web interface. Either way, the code you write will be specific to YOUR router. It won't work with all manufacturers because each one uses a different interface. For example, the code that works on getting the WAN address for a D-Link router won't work with a Linksys router.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Convert Hex strings to Long/Decimals?

Chua Wen Ching9-Jun-05 3:33

Chua Wen Ching

9-Jun-05 3:33

I have a problem. But on .NET 1.1

My Scenario:
Actually I will have a string of hexadecimals read from a xml file. Then from the hexadecimals, i will add 1 value whenever i made any modifications. But just i do not how to get started. It is like an incremental hexadecimals.

I have a string of hex.

string strHex = "0100000000FF";

I want to convert this Hex to decimals, just like the windows calculate, when you type FF in Hex and click on Dec radio button, it will change to 255.

I tried string.Format("{0 Big Grin | :-D

}", strHex);

I tried Convert.ToDecimal or Convert.ToInt64

But i still cannot find a solution?

----

I know how to convert long to hex. Like this.

for (long x = 000000000000; x <= 281474976710655; x++)

{

Console.WriteLine(string.Format("{0:x12}", x));

Console.ReadLine();

}

But i do not know how to do the opposite? Anyone can help me please?

Thanks.

Regards,
Chua Wen Ching
Visit us at http://www.necoders.com

Re: Convert Hex strings to Long/Decimals?

S. Senthil Kumar9-Jun-05 6:32

S. Senthil Kumar

9-Jun-05 6:32

You need to manually loop through your Hex string, a byte at a time and convert it to decimal. Like this

byte []hexValues = new byte[text.Length /3 + 1];
			
int index = 0;
for (int i = 0; i<text.Length; i += 2, index++)
{
   string currentHexValue = text[i].ToString();
   if ( i + 1 < text.Length)
   currentHexValue += text[i+1].ToString();
   try
   {
	hexValues[index] = byte.Parse(currentHexValue, System.Globalization.NumberStyles.AllowHexSpecifier);
   }
   catch(Exception)
   {
      if (currentHexValue == "00")
	return new byte[] {0};
      else
	// Throw exception
   }
}

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Data grid clinet behavior?

hassan azizi9-Jun-05 3:08

hassan azizi

9-Jun-05 3:08

hi how i can embed clinet side script code in web date grid control with
C# .NET ?

thanx

java script?

hassan azizi9-Jun-05 3:05

hassan azizi

9-Jun-05 3:05

hi
i want to use java script files to store data in client computer
like google's gmail mechanism for auto complete and speed matter.
but i don't know how i can hide this file(which containes user data) from
hackers just like gmail(i can't find gmail data in my computer and i can't save gmail page correctly to see my data stored in some files!)

how gmail does it? and how i can prevent jscript file saving request from user?

i'm wating
thanks

axwebbrowser event not working on other machines

Green Fuze9-Jun-05 3:03

Green Fuze

9-Jun-05 3:03

Hey

I created an application that uses the DocumentComplete event.
on my computer it works great, but on 2 other machines I checked my program it does not work, and completly ignores the event.

I checked the automation article's tutorial demo, that uses the same event (great article by the way!), and the same problem appears again! on my computer it works great, but on 2 other it does not, and completly ignores the event.

ANY IDEAS ANYONE????
Thanks alot!

java script security?

hassan azizi9-Jun-05 2:59

hassan azizi

9-Jun-05 2:59

200 files limited prolem with OpenFileDialog?

Khoa Bui9-Jun-05 2:51

Khoa Bui

9-Jun-05 2:51

So, how can I browse my computer and select more than 200 files for the application?

Re: 200 files limited prolem with OpenFileDialog?

Dave Kreskowiak9-Jun-05 8:02

Dave Kreskowiak

9-Jun-05 8:02

There's more information about the problem in this[^] MS KB article. This is a limitation of the underlying unmanaged API, not the .NET wrapper class.

If you want to select more than 200 files, you'll have to design your own OpenFileDialog box.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

How can I design my own OpenFileDialog?

Khoa Bui11-Jun-05 17:26

Khoa Bui

11-Jun-05 17:26

I also think about this. But when you do it, you can only do a little work, for example change 200 files to a larger number and remove unneccessary funtionalities, and what remain is VS.NET's work.
How do I get start?

Re: How can I design my own OpenFileDialog?

Dave Kreskowiak12-Jun-05 4:06

Dave Kreskowiak

12-Jun-05 4:06

No, you can't do that. You must write your own OpenFileDialog from scratch.

You can't change the existing dialog because the problem is NOT within the .NET Framework OpenFileDialog class code. The problem lies within the underlying Windows control, which you cannot change, that the .NET Framework OpenFileDialog class wraps.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

drag a picturebox

Anonymous9-Jun-05 1:34

Anonymous

9-Jun-05 1:34

i've the last nodes of a treeview that rappresent a bitmap image.
I need by dragging one of these node to show a preview (50% smaller and semi-transparent) of the bitmap of referring that follow my cursor (just as a drag effect)
How can i realize this effect?

SelectedPath() not working in FolderBrowserDialog

Anonymous9-Jun-05 1:27

Anonymous

9-Jun-05 1:27

I have the following code:

//Create an FolderBrowserDialog
FolderBrowserDialog folderDlg = new FolderBrowserDialog();
folderDlg.RootFolder = Environment.SpecialFolder.MyComputer;
folderDlg.ShowNewFolderButton = false;
folderDlg.Description = "Select the folder"; 
folderDlg.SelectedPath = strPath;//which is defined earlier and is checked to be a valid path
			
DialogResult result = folderDlg.ShowDialog();
if( result == DialogResult.OK )
{
   //some code here
}

However, when the FolderBrowserDialog is shown, the initial folder is not set even though SelectedPath property is used as above. Similar experience is noticed by me in some other code on similar occasions as well. In fact, in this situation, there is some other abnormality as the OK button is shown enabled for My Computer folder also which is not so when this property is not set. On the other hand, if I set the SelectedPath property as something like @"C:\Program Files\", then it is correctly shown.

What can be the reason? Am I missing something?

Re: SelectedPath() not working in FolderBrowserDialog

Robert Rohde12-Jun-05 4:19

Robert Rohde

12-Jun-05 4:19

I think the FolderBrowserDialog class has a bug with paths with more than 256 chars. Might this be the cause?

question in using matlab dll in c#

hediii9-Jun-05 1:22

hediii

9-Jun-05 1:22

Hi every body , from a few days i have a problem that i can't solve , how i can pass a STRING variable by using a matlab program dll .
The document 1,2,3 ways offer just a double variable
Plz i need it ,
thx

clean viruse in c#

computer_eng9-Jun-05 1:13

computer_eng

9-Jun-05 1:13

hi..
please ...please i neeeeeeed help about how the fixed(clean)for viruse will done in c# or java
please if any one have information about this subject pleeeese help me

423423

clean viruse in c#

computer_eng9-Jun-05 1:12

computer_eng

9-Jun-05 1:12

hi..
please ...please i neeeeeeed help about how the fixed(clean)for viruse will done in c# or java
please if any one have information about this subject pleeeese help me

Re: clean viruse in c#

Dave Kreskowiak9-Jun-05 6:52

Dave Kreskowiak

9-Jun-05 6:52

You say that like it's one simple method for every virus.

Sorry, it's not. Each virus has it's own cleaning method. This is because each virus either moves legitimate data/code to a known place (different for every virus), and if known can be put back, or just destroys the original data/code entirely, making cleaning impossible without restoring the file from a backup copy.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

rawsocket

computer_eng9-Jun-05 1:07

computer_eng

9-Jun-05 1:07

hi.. i need some help about raw socket how i can creat application in c# to catch the packet
the code that i found in codeproject is very complex and i need simple one only to catch the packet

Re: rawsocket

Dave Kreskowiak9-Jun-05 6:49

Dave Kreskowiak

9-Jun-05 6:49

computer_eng wrote:
i need simple one only to catch the packet

There is no "simple" method to catch packets. What you want to do is not an easy operation because it's tightly tied into the lower-level hardware of the NIC.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

.net framework required or not/do com interopt.?

montu33779-Jun-05 0:57

montu3377

9-Jun-05 0:57

Hi,

We had developed our project into C#.net 2005,Now client is having project which is in Vb 6.0 and that project is using one another .exe file but that is lincesed but now he wants that to use our project's(C#.net).exe into vb 6.0.

my question is that if we replaced that .exe file ,is client need .net framework on his pc?becoz our .exe file is of C#.net.

2nd question.
Now suppose if we don't want to installed .net framework on client pc in that case can we change our .dll file (convert our project into .dll(class library)) and after using COM interoptiblity on that dll and then make the .exe file and replace with vb 6.0?

so can anybody tell me what is better & easy way to solve this?
can anybody tell me that what is min. requirement in client pc to use .net exe?

thanks.

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