C# Discussion Boards - CodeProject

khanfresh5-Apr-06 18:45

5-Apr-06 18:45

I have a problem:

In VB.NET code: AddHandler m_PacketMonitors(i).NewPacket, AddressOf OnNewPacket

Legend: NewPacket is event, OnNewPacket is sub

So I want to convert this code to C#!
I tried many ways to convert but it didn't work!
Please help me this problem and explain how it works!
Thanks a lot!

Mai Duc Khanh
Senior of DaNang University, VietNam

Re: Help me in AddHandler from VB.NET to C#

Robert Rohde5-Apr-06 19:27

Robert Rohde

5-Apr-06 19:27

In C# you need to know what type of delegate the vent needs. Assuming the the event delegate is named EventHandler (the default one for many events) the code would look like this:

m_PacketMonitors(i).NewPacket += new EventHandler(OnNewPacket);

Also note that the Visual Studio designer greatly helps. If you type until += the designer should automatically popup some stub with the correct delegate.

Re: Help me in AddHandler from VB.NET to C#

khanfresh6-Apr-06 14:36

khanfresh

6-Apr-06 14:36

Thank you for your support!
Thanks a lot!
Mai Duc Khanh.

Locking XML File

emran8345-Apr-06 14:24

emran834

5-Apr-06 14:24

Hi,
I am using Windows Form (C# Express 2005) .NET 2.0
I have a background worker who always read an XML file and do some work. At the same time an user can open the same XML file, do some changes and save the XML file. Now, Some times My application is throwing XML file read error etc... when the backgroundworker conflicts the read and save process of XML. Can you please show me the way to lock the XML file so that they dont conflict, rather wait for the other thread finishes its work.

Thanks

Re: Locking XML File

Christian Graus5-Apr-06 15:00

Christian Graus

5-Apr-06 15:00

You'd have to do some inter thread locking, check out the lock keyword.
http://www.ondotnet.com/pub/a/dotnet/2001/08/06/csharp.html?page=3[^]

Christian Graus - Microsoft MVP - C++

Re: Locking XML File

emran8345-Apr-06 15:37

emran834

5-Apr-06 15:37

Thanks for your reply.
the article looks not so simple. I thought some easy short snippet could do this work. Is not there any easy snippet available ?

Re: Locking XML File

Christian Graus5-Apr-06 16:04

Christian Graus

5-Apr-06 16:04

The hard bit will be having an object visible to all code that accesses the file, so it can create the same lock. Beyond that, I didn't expect it to be too hard.

But yes, multi threaded code IS hard, at least, harder than single threaded.

Christian Graus - Microsoft MVP - C++

How to send email using SMTP with Authentication

emran8345-Apr-06 14:15

emran834

5-Apr-06 14:15

Hi,
I have seen the nice feature of .NET 2.0 for sending email using SMTP, but i did not find any way to use SMTP with Authentication (user name, password). Can u please show me some way....

thanks

Polynomial coefficients...

KORCARI5-Apr-06 13:10

KORCARI

5-Apr-06 13:10

Hi guys.I want to create a function of form (a*x^+b*x+c/d*x^+k*x+m)in order so I can enter in two texboxes coefficients [a,b,c] and [d,k,m]and then use this function to plot a graph.But I dont know how to get values from the texboxes and use them? Anybody can show me any tutorial or link for similar problem?I would be very grateful.Best regards

Re: Polynomial coefficients...

Christian Graus5-Apr-06 13:46

Christian Graus

5-Apr-06 13:46

double d = 0;
if (double.TryParse(textbox1.Text, d)
{
// d contains the double
}
else
{
// the text could not be converted to a double.
}

Christian Graus - Microsoft MVP - C++

DataGrid Edit a Cell

cppdotnet5-Apr-06 10:53

cppdotnet

5-Apr-06 10:53

I want to edit a cell. Currently I have a Edit button which makes 2 cell editable and then I update.

Is there a way I can double click on cell and make that cell editable and change the value.

rather theb Click on Edit then Update or Cancel.

Thanks

Thanks

Re: DataGrid Edit a Cell

russellsoft6-Apr-06 4:36

russellsoft

6-Apr-06 4:36

Use DataGridView component (.NET 2.0)...
There is possible to attach event on a cell...

For loop performance problem in .NET 2.0

ayevkin5-Apr-06 10:32

ayevkin

5-Apr-06 10:32

Hello,

Switching from version 1.1 to .NET 2.0 I have lost about 40% of speed of my calculations. To find out what is the reason I tried to change ArrayList to List<T>, foreach to for loop. It did not work in my case.

Refining my code I came to very simple example: for loop was under investigation.
a) Empty loop
M = 1000000000;
for (int i = 0; i < M; i++)
{
//do nothing
}
Running time in milliseconds: .NET 2.0 – 2921, .NET 1.1 – 718. .NET 1.1 is 4 times faster.

For loop contains two visible operations: increment i++ and comparison i < M.

b)To find out what is slowing the calculation I added increment inside the loop.

for (int i = 0; i < M; i++)
{
count++;
}
Running time in milliseconds: .NET 2.0 – 3484, .NET 1.1 – 1703.
Now the deference is not so huge.

c) Let us add comparison operation

for (int i = 0; i < M; i++)
{
if (count<M)
count++;
}
Running time in milliseconds: .NET 2.0 – 5828, .NET 1.1 – 2046.
The difference is increasing.

d) More comparison

for (int i = 0; i < M; i++)
{
if (i<M)
if (count<M)
count++;
}
Running time in milliseconds: .NET 2.0 – 7421, .NET 1.1 – 2721.

One can conclude that the slowing part is the primitive comparison operation.

Can somebody say what is going on?

Thanks,

Alex

how to play wav file in C#

nauty5-Apr-06 9:49

nauty

5-Apr-06 9:49

hi friends
i am having a problem.I am not able to play wav/mp3 file in C#.
I downloaded an activeX component "RSP MP3 Player OCX 2.7.5" but it was in vb.I tried convert it into dll.but then also it had a problem. one of its method was
PlayFile(string path,ref bool wait).

Could anyone just tell me what is ref bool
or
from where i can get a wav file activeX control which can be used in C#.

please help me its really urgent.
thanx in advance.

nauty

Re: how to play wav file in C#

Ed.Poore5-Apr-06 9:54

Ed.Poore

5-Apr-06 9:54

nauty wrote:
ref bool

is essentially a reference or pointer to a boolean data type.

nauty wrote:
from where i can get a wav file activeX control which can be used in C#.

.NET 2.0 has one in the framework.

Ed

Re: how to play wav file in C#

Graham Nimbley5-Apr-06 10:51

Graham Nimbley

5-Apr-06 10:51

If you are .NET 2.0 System.Media.SoundPlayer is the class you need. It will only play wav files. It's very basic in functionality, but if you only need to play wav files, then it should do. E.g.

<br />
using System.Media;<br />
<br />
...<br />
<br />
SoundPlayer sound=new SoundPlayer(@"C:\Path To\WaveSound.wav");<br />
sound.Play();<br />
<br />

If you are creating lots of instances of SoundPlayer don't forget to call Dispose() or use "using"

Graham

-- modified at 16:51 Wednesday 5th April, 2006

Re: how to play wav file in C#

Ed.Poore5-Apr-06 12:07

Ed.Poore

5-Apr-06 12:07

I think you meant to reply to nauty not me D'Oh! | :doh:

Re: how to play wav file in C#

nauty5-Apr-06 18:45

nauty

5-Apr-06 18:45

Hi ed and grahan
thanx for the help but i am using 1.1
and there is no such namespace.i used mci32.ocx in my project but it was also not playing the files.So if you people have some winamp plugin or some winamp ocx files then do tell me.

and also what value is to be passed in the "ref bool wait" variable.i am really confused.
its reaally urgent

nauty

Re: how to play wav file in C#

Bob_Sun5-Apr-06 20:14

Bob_Sun

5-Apr-06 20:14

I met the same problem and I wrote a sound lib myself in C++.
Form C++, you can easily access mixer funcs provided in winmm.lib.

Of causeif DirectX is a shortcut if it can be installed in you system.

Re: how to play wav file in C#

Ed.Poore5-Apr-06 20:27

Ed.Poore

5-Apr-06 20:27

ref bool is a reference to a boolean value (like a pointer in C), it is used if the function needs to change one of the calling parameters, like in C.

So just declare a boolean, e.g.:

bool myWait = false;

and then pass it as, e.g.:

library.function(parm1, parm2, ref myWait);

This allows library.function to change the value of your variable myWait.

Ed

Re: how to play wav file in C#

V.5-Apr-06 20:36

5-Apr-06 20:36

Did you search here on CP? I found someting here lately.

Coulda, woulda, shoulda doesn't matter if you don't.

Re: how to play wav file in C#

scoroop5-Apr-06 22:09

scoroop

5-Apr-06 22:09

searching is a great skill i can see ;]...

http://www.codeproject.com/cs/media/tonysound.asp

Thanx for the kind help

nauty5-Apr-06 23:58

nauty

5-Apr-06 23:58

Hi buddies
Thanx for your wonderfull support.without your help i could'nt have done that.
I used "RSP MP3Player OCX 2.7.5" . just using it, the task became a kids play.
if someone else need it can download it from net.
Simply add its components and use its method. its the most easiest of all.
Thanx to all ones again and especially to Ed.Poore.
bye

nauty

DataGridView Help urgent

Naveed Shoaib5-Apr-06 9:43

Naveed Shoaib

5-Apr-06 9:43

I am working on a Data Grid View control that stores values of a matrix. The values can only be integers or floating point values. I have two problems:

1. How can I retrieve values from the DataGridView Control and store it in a double 2D array. Please tell me the approperiate method.

2. Can I bind the DataGridView Control to a specific data type, e.g. double, so that automatic validation can be done on the values entered.

Thanks
Naveed

Creating a Process question!!!

tryston025-Apr-06 9:22

tryston02

5-Apr-06 9:22

Hello,

I am trying to use our 3rd party fax software FaxPress. It requires this line of text to be called during a command line.

Our old VB 6 app is doing this but using a shell command. I was told this could be done using the Process class in C#.

Here is what I have:

    <br />
    /// <summary><br />
    /// Faxes attachments to destination<br />
    /// </summary><br />
    /// <param name="output">Output directory for FaxPress</param><br />
    /// <param name="subject">Subject Line</param><br />
    /// <param name="faxPress">Fax system to use. TACCFAX1*</param><br />
    /// <param name="account">Login account. XOC</param><br />
    /// <param name="files">Attachments /A</param><br />
    /// <param name="phone">Calling info [name @][company @] PhoneNumber</param><br />
    private void GenerateFax(string output, string subject, string faxPress, string account, string files, string phone)<br />
    {<br />
        StringBuilder executeString = new StringBuilder();<br />
        executeString.Append("SubmitFax /S " + faxPress);<br />
        executeString.Append(" /U " + account);<br />
        executeString.Append(" /R " + phone);<br />
        executeString.Append(" /O " + output);<br />
        executeString.Append(" /B " + subject + " ");<br />
        executeString.Append(files);<br />
        executeString.Append(" " + "/C NO COVER PAGE");<br />
<br />
        Process process = new Process();<br />
        process.StartInfo.Arguments = executeString.ToString();<br />
        process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;<br />
        process.Start();<br />
    }<br />

Does this look right? Is process.StartInfo.Arguments the right property? There is no batch file or .exe to be called, just this string.

Thanks for any help!

Chris

-- modified at 15:23 Wednesday 5th April, 2006

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