C# Discussion Boards - CodeProject

leppie7-Dec-05 22:53

leppie

7-Dec-05 22:53

Noon14 wrote:
how can I save back the changed record ,do I have to serialize the all items each time when a one record updated , what is the right method to do so

Yes, you have to 'overwrite' the old serialized object.

^{xacc.ide-0.1.0.8 released! Now with code folding :) Download and screenshots}

Re: Binary file serializaton

Noon148-Dec-05 1:41

Noon14

8-Dec-05 1:41

leppie wrote:
Yes, you have to 'overwrite' the old serialized object

Thank you, so what is the best way other than serializaion to deal with binary data files that been saved as blocks or records .

Reload apllication

RobertoTjMx7-Dec-05 11:40

RobertoTjMx

7-Dec-05 11:40

Hi, everyone, I'm new in this forum, I'm a question about if is posible when is run a program(update.exe) recall the program(update.exe), I'm desing a Update program but How can i close my update.exe when hava a new update of my exe and continue the process?

For your help thanks.

Re: Reload apllication

Judah Gabriel Himango7-Dec-05 12:44

Judah Gabriel Himango

7-Dec-05 12:44

Search CodeProject or the web for "single instance application". There's some decent articles on CP regarding this, for example, here[^].

"Every technology has its detractors. I'm sure that somebody once stated that the pointy stick would never replace the fingernail as the fighting man's weapon of choice."

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C# Flash Player Detection

radnix7-Dec-05 11:34

radnix

7-Dec-05 11:34

Hi, I have a form that launches an external shockwave flash program and need to check, first, if the flash player is installed on the PC. Any ideas?

Thanks ahead!

radnix@hotmail.com

Re: C# Flash Player Detection

Curtis Schlak.7-Dec-05 11:45

Curtis Schlak.

7-Dec-05 11:45

You check for the existence and validity of the HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ShockwaveFlash.ShockwaveFlash key and its subkeys.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: C# Flash Player Detection

radnix7-Dec-05 13:13

radnix

7-Dec-05 13:13

Thank you, I'll try it! Smile | :)

...of all the things I've lost, I miss my mind the most.

Re: C# Flash Player Detection

Curtis Schlak.8-Dec-05 2:23

Curtis Schlak.

8-Dec-05 2:23

radnix, 't was my pleasure. Happy coding!

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Get the value of listview of selected row in C#.NET

vikrant singh7-Dec-05 11:05

vikrant singh

7-Dec-05 11:05

Hi,
i want to get the value of cell of selected row of listview control into TextBox.i hv got this by using the code as below.

for (int i=0;i < lstCorpname.SelectedItems.Count;i++)
{
txtAddressNo.Text=lstCorpname.SelectedItems[i].SubItems[0].Text.ToString();
txtname.Text=lstCorpname.SelectedItems[i].SubItems[1].Text.ToString();
}

but i think this is not the right way.
can u please give me another code.

Thank's

Regard's
Vikrant Singh

-- modified at 17:11 Wednesday 7th December, 2005

command data

realmontanakid7-Dec-05 10:42

realmontanakid

7-Dec-05 10:42

Hi
In a manual from a beamer i found following command data to switch the beamer to Power On.
02H 00H 00H 00H 00H 02H
What does this line means? Are this Bios Interupts?
I try to get this Data to the Beamer using System.Io.Ports.
But i don't know how. As a string? As a Byte?

System.IO.Ports.SerialPort sPort = new SerialPort("COM1", 38400, Parity.None, 8, StopBits.One);
sPort.Open();
sPort.Write( --> What? string? byte[]? char[]? <--)
sPort.Close();

Best Regards

user in a computer

sebastianos7-Dec-05 9:35

sebastianos

7-Dec-05 9:35

How I can see what user open session in a computers of a domain (without Active Directory)?

Thank
Sory for my english.

Re: user in a computer

RobertoTjMx7-Dec-05 12:08

RobertoTjMx

7-Dec-05 12:08

Maybe you can use the class WindowsPrincipal of the namesspace System.Security.Principal.

Where are you from? What is your native lenguage?

Re: user in a computer

sebastianos7-Dec-05 18:05

sebastianos

7-Dec-05 18:05

I'm from Argentina

Il try with WindowsPrincipal, THANKZ!!

using custom button

mehrdadc487-Dec-05 9:23

mehrdadc48

7-Dec-05 9:23

hi.
how can I use a button that I created in a graphical program (such as photoshop) as a traditional button in my form?

Best wishes

Re: using custom button

Judah Gabriel Himango7-Dec-05 10:35

Judah Gabriel Himango

7-Dec-05 10:35

Just save the picture as an image file, then in your form, set the .Image property of a System.Windows.Forms.Button to your image.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

Debug Help

gmhanna7-Dec-05 9:22

gmhanna

7-Dec-05 9:22

Hi,

I have a Web Based C# program that is calling a legacy .DLL file made up of approximately 250 routines to perform credit card authorizations. I'm receiving a System.NullReferenceException somewhere within in the .DLL.

Once the Web C# program calls the initial .DLL module, I lose control of the debugger until it returns. The exception handler in the Web C# program is sighting the initial module as the one that had the NullReferenceException, however I know this is not true.

How can I obtain the real routine that is having a problem? What would be even better is an approximate line number within the routine. I have the source code to the DLL and can add something in there. I just don't want to add printf routines all over it saying, I'm here, I'm leaving.

Thank you,

Glenn

Re: Debug Help

Judah Gabriel Himango7-Dec-05 10:37

Judah Gabriel Himango

7-Dec-05 10:37

When you run your app, just attach the Visual Studio debugger to the native process via Tools->Attach to Process...

Also, since you have the source, why not just create a Visual Studio solution with your legacy source as one project in the solution, and your Web C# program as another project in your source? I imagine Visual Studio can take care of the details from there.

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I'm currently blogging about: Bought a House!
Judah Himango

Re: Debug Help

gmhanna8-Dec-05 5:40

gmhanna

8-Dec-05 5:40

Hi Judah,

I tried to do what you suggested, Tools->Attach to Process... Selected Internet Explorer, clicked Attach and then clicked the check box for Native. Pressed F11 to step into the call and it didn't stop at the error in the DLL.

I thought of creating another Visual Studio project for the DLL, however when I tried to compile it, it took me several hours to remove the error messages from just one of the 250 routines. The .DLL is built with Watcom's 10.6 compiler and is a standard windows DLL.

The C# routine for the web has a try and catch block. Maybe I can add one of those to the C DLL entry point and print out the information. I'll have to go digging in the garage for the Watcom Manauls.

Your thoughts?

Glenn

failure of the code when the mouse go out of the picturebox area

haytham_mohammad7-Dec-05 8:46

haytham_mohammad

7-Dec-05 8:46

i attached a program that view image and make some processing on this image but when the mouse get from the boundaries of the picturebox the code failed although when the mouse moves toward right or left or up dut to picture the coe still work , it faill only when the mouse move toward the bottom of the picture
plz i need a solution to this problem
thanks in advance

haitham

Re: failure of the code when the mouse go out of the picturebox area

Judah Gabriel Himango7-Dec-05 10:39

Judah Gabriel Himango

7-Dec-05 10:39

There is no way for us to help you unless you give us some code. Did you try debugging the application using a debugger such as Visual Studio? This will tell you were the exception is occurring and why its occurring.

Tech, life, family, faith: Give me a visit.
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Judah Himango

Re: failure of the code when the mouse go out of the picturebox area

haytham_mohammad7-Dec-05 11:19

haytham_mohammad

7-Dec-05 11:19

Sorry I forget to accompany the code with message
Here you are the code

private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)<br />
       {<br />
           //          MessageBox.Show("Mouse move on Picture box, at" + e.X.ToString() + ","+ e.Y.ToString());<br />
           try<br />
           {<br />
               textBox1.Text = e.X.ToString();<br />
               textBox2.Text = e.Y.ToString();<br />
               Bitmap myBitmap = new Bitmap("Calvin2.jpg");<br />
               Color pixelcolor = myBitmap.GetPixel(e.X, e.Y);<br />
               textBox3.Text = pixelcolor.ToString();<br />
               textBox4.Text = myBitmap.PixelFormat.ToString();<br />
               label5.Text = "Red depth is " + pixelcolor.R.ToString();<br />
               label6.Text = "Green depth is " + pixelcolor.G.ToString();<br />
               label7.Text = "Blue depth is " + pixelcolor.B.ToString();<br />
           }<br />
           catch (System.ArgumentOutOfRangeException)<br />
           {<br />
           }<br />
       }

and i use visual studio.net 2003

haitham

Re: failure of the code when the mouse go out of the picturebox area

Judah Gabriel Himango7-Dec-05 15:09

Judah Gabriel Himango

7-Dec-05 15:09

Well, is the picturebox the same size as the calvin image? If not, then a call to GetPixel(e.X, e.Y) may fail.

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asychronicly downloading files

stassaf7-Dec-05 8:34

stassaf

7-Dec-05 8:34

Hi,

I'm trying to download several files at the same time in order to increase
performance.
I've tried to define a method that downloads a file, delegate this method and
call BeginInvoke in a loop.
The problem is that every BeginInvoke returns an IAsyncResult and I don't know
how to figure out when all the calls for this methods where completed.

My Code:
public class AsyncDemo
{
// The method to be executed asynchronously.
public bool TestMethod(string fileAdd, string fileName, out int threadId)
{
threadId = AppDomain.GetCurrentThreadId();
try
{
WebClient Client = new WebClient ();
Client.DownloadFile(fileAdd, fileName);
}
catch(Exception ex)
{
return false;
}
return true;
}
}

public delegate bool AsyncDelegate(string fileAdd, string fileName, out int threadId);

static void Main(string[] args)
{
//files to download
string[] fileUrlArr = new string[2];
string[] fileNameArr = new string[2];
fileUrlArr[0] = "http://www.site1.com/xxx.xml";
fileNameArr[0] = "file1.xml";
fileUrlArr[1] = "http://www.site2.com/xxx.xml";
fileNameArr[1] = "file2.xml";
int threadId;

// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();

// Create the delegate.
AsyncDelegate dlgt = new AsyncDelegate(ad.TestMethod);
IAsyncResult ar=null;

for(int i=0; i<2; i++)
{
// Initiate the asychronous call.
ar = dlgt.BeginInvoke(fileUrlArr[i], fileNameArr[i],out threadId, null, null);
}

ar.AsyncWaitHandle.WaitOne();
}

Any help will be appreciated.
Best Regards,
Assaf

Re: asychronicly downloading files

Judah Gabriel Himango7-Dec-05 10:43

Judah Gabriel Himango

7-Dec-05 10:43

First, there are many articles on the web about using WebRequests asynchrounously. I suggest you read a few, such as this one[^].

After you've downloaded the file asynchronously, just store it in some class variable (or, if you have multiple files, store the files by adding them to some list such as System.Collections.Generic.Queue or System.Collections.Generic.List.

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Judah Himango

Re: asychronicly downloading files

stassaf7-Dec-05 11:44

stassaf

7-Dec-05 11:44

10x, this was very helpful.

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