C# Discussion Boards - CodeProject

James Spibey4-Aug-05 7:08

4-Aug-05 7:08

Hey Guys,

Does anyone know of any good commercial audio processing libraries which can be used with .NET (either natively or via COM)? I'm looking for something which can mix multiple input files (mp3 or whatever) into one output file.

I've already found one at http://www.nctsoft.com/products/NCTAudioStudio2/ but the only version which comes with support is $2000 which is out of our budget.

Cheers

James

Error when read a related deleted row

Ming Luo4-Aug-05 6:50

Ming Luo

4-Aug-05 6:50

Hello everyone.
It's similiar problem as the last thread I pasted.
Two tables invoice and order_details are related, invoice_no is the foreign key of the order_details table. When I delete an invoice, the corresponding order_details record will be deleted automatically because the delete rule is cascade. Then if I try to loop a field say "type" in order_details table like:
foreach(DataRow row in ds.Table["Order_Details"].Rows)
{
row["type"]....
}

an error happens which says "Can't access the deleted rows. Dynamic SQL generation for the delete command is not supported against a selectcommand that doesn't return any key column information".
I try to use like
ds.Table["Order_Details"].AcceptChanges();
or write the chances back to the database. But it still doesn't work.
I think it may have some concurrency problem, does anybody know how to solve the problem please???

Asura

Error in relational database. Please Help!

Ming Luo4-Aug-05 6:43

Ming Luo

4-Aug-05 6:43

Hello, everyone! I am writing a interface to manager a invoice system database in Access.
I have a customer table and address table. Every customer may have several addresses. The delete, update rules are cascade.
If I delete a customer, the related addresses will be deleted at the same time. An error happens when update the address table which says "Concurrency Violation: the delete conmmand affected 0 records". I know this could be caused by the constraint relation. But I don't know how to avoid this happen. Any idea please???
Thanks in advance!

Asura

object reference problem

ppp0014-Aug-05 6:17

ppp001

4-Aug-05 6:17

Hi,

I have a hashtable which store the object key and the object itself. Lets say, the map store id and the Student object. And there will be other objects which will refer
to the student objects in the hashmap. And how can I know
that whether the student object in the hashtable are not referred by other object, so that I can remove the student in the hashtable ?

Thanks

Re: object reference problem

Guffa4-Aug-05 8:47

Guffa

4-Aug-05 8:47

Make a control object that contains a counter and a reference to a student object. Store the control objects in the hash table, and use the counter to keep track of the references to the object. Each time you add a reference to it, increase the counter, and each time you remove a reference, decrement the counter. All objects where the counter is zero has no references, and can be removed.

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b { font-weight: normal; }

ram memory pocket pc

Anonymous4-Aug-05 6:14

Anonymous

4-Aug-05 6:14

Hello, somebody can help me with a development that I am doing for pockets. porblema is that necisto to find the way to consult the external ram memory and memories of pocket PC}. somebody knows some libreria that it can consult this. I thank for the aid to them.

.NET Logging Framework (database)

pankazmittal4-Aug-05 6:13

pankazmittal

4-Aug-05 6:13

Hi I want to implement logging framework in a .NET application. The logs should go in a SQL Server database.

How can I do that? Any reliable sample links? Thanks in advance.

Pankaj

Re: .NET Logging Framework (database)

Dave Kreskowiak4-Aug-05 6:28

Dave Kreskowiak

4-Aug-05 6:28

It's already been done in the Enterprise Library, Logging and Instrumentation Application Block, found here[^].

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

Re: .NET Logging Framework (database)

Steve Maier4-Aug-05 6:42

Steve Maier

4-Aug-05 6:42

There is also log4net from Apache[^].

Steve Maier, MCSD MCAD

Match percentage between two string

Member 17237104-Aug-05 5:50

Member 1723710

4-Aug-05 5:50

HI all,
How to get match percentage between two string using c# or vb.net.I need it urgently.Thanks in advance.

Ashok Mohanty

Re: Match percentage between two string

Dave Kreskowiak4-Aug-05 6:24

Dave Kreskowiak

4-Aug-05 6:24

Match percentage? Based on what comparison of the strings?

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

Re: Match percentage between two string

Patric_J5-Aug-05 5:23

Patric_J

5-Aug-05 5:23

Use Levenshtein distance alghoritm, see below link for some C# code:

Text search part II

/Patric
My C# blog: C# Coach

MDI Form Toggling Using Custom Buttons

lpointer4-Aug-05 5:06

lpointer

4-Aug-05 5:06

In a Windows Forms application we have a MDI area where multiple forms can be opened up at one time. Often the users want to toggle from one form to another and asked us to put some custom toolbar buttons similar to what you see on your web browser on the main application toolbar in order to achieve this behavior. I know that you can toggle nicely using the Control+Tab (forwards) or Control+Shift+Tab (backwards) Keys. However, I want to mimic that same exact behavior when the user clicks on the toolbar buttons.

I tried to achieve this by using the Activate() method on an individual MDI form after getting all of the MDI forms and determining which needed to be sent to the front. This works, but when you Maximize a single MDI Form and try to use Activate() it shows this distracting flashing when you are toggling between the MDI forms. Does anyone know how to fire the Windows key event for Control+Tab or Control+Shift+Tab from within the clicked event of a toolbar button?

Many thanks,

Lee

Re: MDI Form Toggling Using Custom Buttons

Luis Alonso Ramos4-Aug-05 5:46

Luis Alonso Ramos

4-Aug-05 5:46

I guess you could try SelectNextControl on the MDI parent form (or is it the MDI client, I would guess). I don't know it if will work (probaby not), but try it.

If it doesn't work, you have the array of MDI children (in the MdiChildren property.) Find the current active child (ActiveMdiChild) in the array, and then ActivateMdiChild the previous or the next in the array. It's not so hard:

void SelectNextMdiChild(bool next)
{
    if(MdiChildren.Length <= 1)
        return;

    From current = ActiveMdiChild;
    for(int i = 0; i < MdiChildren.Lenght; i++)
    {
        if(MdiChildren[i] == current)
        {
            // The first window is the active one and the user
            // wants the previous?
            if(!next && i == 0)
            {
                // Activate the one at the end
                ActivateMdiChild(MdiChildren[MdiChildren.Length - 1])
            }
            else if(next && i == MdiChildren.Length - 1)
            {
                // Last window and looking for next window?
                // activate the first one
                ActivateMdiChild(MdiChildren[0]);
            }
            else
            {
                if(next)
                    ActivateMdiChild(MdiChildren[i + 1]);
                else
                    ActivateMdiChild(MdiChildren[i - 1]);
            }

            return;
        }
    }
}

I just wrote that code and didn't test it, but it should achieve your desired effect.

Good luck!

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

DropDownList comboBoxes

patgo4-Aug-05 4:14

patgo

4-Aug-05 4:14

Hello, all!

I have 2 comboBoxes with the same itemCollection: Px, Py and Pz. They where built so that if I choose Px in comboBox1 the itemCollection in comboBox2 is only Py and Pz. To do this I created an event (DropDown event) for each of the comboBoxes that clears the itemCollection of the other comboBox and rebuilts it without the selectedItem of the comboBox that triggered the event.

This works just fine if the comboBoxes are DropDown, but it doesn't prevent the user from writing anything in the comboBoxes!

To make the comboBoxes readOnly I had to make them DropDownList, but when I click one of them the selectedItem disappears, wich means I can leave the comboBox without any selectedItem!

Any ideas on solving this problem? Or do I have to keep the comboBoxes DropDown and create another event (which one?) that prevents the user from writing anything in the comboBoxes?

Thank you in advance,
Patrícia Gonçalves

Re: DropDownList comboBoxes

mav.northwind4-Aug-05 5:30

mav.northwind

4-Aug-05 5:30

Hello!

You'll have to set the SelectedIndex property of the ComboBox whose items you've rebuilt afterwards.

Regards,
mav

Re: DropDownList comboBoxes

patgo5-Aug-05 2:30

patgo

5-Aug-05 2:30

Thanks! I saved the selectedItem in a temporary string (t), rebuilt the itemsCollection and set the selectedItem of the comboBox to t.

Is this what you ment? Anyway... it worked! Thank you!

index of a Row

zaboboa4-Aug-05 4:07

zaboboa

4-Aug-05 4:07

Hello,

I have:

foreach (DataRowView row in this.dataview) {<br />
			      for (int i = 0; i < row.Row.Table.Columns.Count; i++) {<br />
			         if (row["NumUnits"].ToString().Length == 0 || row["MonthsToService"].ToString().Length == 0) {<br />
			            <br />
			            break;<br />
			         }<br />
			      } // End of FOR loop<br />
			   } // End of FOREACH statement

Is there a way of getting the index of the row within the IF statement?
Thank you

Re: index of a Row

Guffa4-Aug-05 4:38

Guffa

4-Aug-05 4:38

There is no built in function for that. Add a counter that you increment for each row.

---
b { font-weight: normal; }

Re: index of a Row

Alomgir Miah4-Aug-05 4:45

Alomgir Miah

4-Aug-05 4:45

Agreed. The IndexOf () is available in .NET framework 2.0.
You will have to iterate and compare to get the Row index.

Live Life King Size
Alomgir Miah

Re: index of a Row

zaboboa4-Aug-05 6:46

zaboboa

4-Aug-05 6:46

Thank you for your help

How to get Attribute in XPath ?

Anonymous4-Aug-05 3:48

Anonymous

4-Aug-05 3:48

Hello there
I am some how stuck to get the attribute values of the node. rest every thing is fine . this is the code
the XML is like this (just ruff idea)

<country>
<city name="abc" location="Somewhere">

XPathDocument xdoc = new XPathDocument(reader);
XPathNavigator nav = xdoc.CreateNavigator();
XPathNodeIterator nodeItor = nav.Select("Country/City");

Now I want to get the name attribute and location attribute.

please help me out.

thanks in Advance

Missed XML Part

Anonymous4-Aug-05 4:13

Anonymous

4-Aug-05 4:13

missed the XML due to tags
<Country>
<City Name="abc" location="xyz">
</Country>

Re: Missed XML Part

Kevin McFarlane4-Aug-05 4:48

Kevin McFarlane

4-Aug-05 4:48

There are some good examples here:

http://samples.gotdotnet.com/quickstart/howto/[^]

Kevin

DataView.Sort not working

livez4-Aug-05 3:21

livez

4-Aug-05 3:21

Hello all

I have a Datatable, along with datarow and dataview defined:

<br />
DataTable dt = new DataTable();<br />
DataRow dr;<br />
DataView dv = new DataView();<br />

The Datatable is given these columns:

<br />
dt.Columns.Add(new DataColumn ("ID", typeof(string)));<br />
dt.Columns.Add(new DataColumn ("Antal", typeof(int)));<br />
dt.Columns.Add(new DataColumn ("belopp", typeof(string))<br />

After filling the table with data I make a view:

<br />
dv = new DataView(dt);<br />

... and then I sort it:

<br />
dv.Sort = "Antal DESC";<br />

My problem is, the sortin doesnt seem to work, when I print every row starting from the first I still get results like this:

antal<br />
2<br />
1<br />
2<br />
4<br />
4<br />
1<br />
6

Can anyone see what I'm doing wrong?

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