Re: MessageBox.Show() ?! - .NET (Core and Framework) Discussion Boards

TTECHNOLOGY6-Mar-05 19:50

6-Mar-05 19:50

If you have selected multiple rows, then use the following code:

CurrencyManager cm = (CurrencyManager baseDataGrid.BindingContext[baseDataGrid.DataSource, baseDataGrid.DataMember];

DataView dv = (DataView)cm.List;

IEnumerator iterator = dv.GetEnumerator();
DataRowView drv;
int i= 0;
while(iterator.MoveNext())
{
if (baseDataGrid.IsSelected(i))
{
drv = (DataRowView)iterator.Current;
DataRow row = drv.Row;
// Do something with the row
}
i++;
}

Regards

Uwe

wav recording and playing in .Net c#

eXception!3-Mar-05 22:25

eXception!

3-Mar-05 22:25

Hi,

I need some help recording and playing wav sound format.
I want to record sound from microphone with the opportunity of changing
the sample rate vs.(in order to change recorded file size) and
playing the recorded wav file.

I want to use c# .net 2003.

What should ı use?
Where to begin?

Any help will be helpfull.

Thanks

_!eXception!_

App config

Small Rat3-Mar-05 18:05

Small Rat

3-Mar-05 18:05

Hi,Everybody,

I want to put :
<configsections>

<hplist setting1="<p class=g>|<font color=#008000>|<b>|</b>|/ -">
into my configuration file, but when I run the project, it saids, the setting includes invalid letter, like "<",

Please tell me how to solve the problem!!!

Thanks for any help!

Alan Shen

Alan Shen

MCAD for .NET Version
^~^~^~^~^~^~^~^~^~^~^
Great idea is the beginging of success!

Re: App config

Anonymous4-Mar-05 7:07

Anonymous

4-Mar-05 7:07

would be helpfull if we could see your whole configfile

COM Interop - Passing pointers from unmanaged to managed

Laxman Prabu2-Mar-05 21:23

Laxman Prabu

2-Mar-05 21:23

Hi All,

I have problem passing pointers from unmanaged to managed through IDispatch::Invoke. The 'Invoke' returns E_NOINTERFACE. It works fine with passing values though. Any idea?

Thanks in advance.

More Information

ursus zeta6-Mar-05 12:18

ursus zeta

6-Mar-05 12:18

Your question inspires a number of further questions.
Interop is always confusing. I would recommend, ".NET and COM: The Complete Interoperability Guide", by Adam Nathan.
Here is a chapter from his book that might help:
http://www.samspublishing.com/DOTNET_HOME/sampler/chapters/067232170x/067232170x_ch03.html[^]

MessageBox.Show() ?!

truonghongquan2-Mar-05 19:26

truonghongquan

2-Mar-05 19:26

I has a problem with function MessageBox.Show().

When I call MessageBox.Show() ex: MessageBox.Show("Hello World","Error"), I can't see my message "Hello World" althought I see MessageBox windows.

Some one to help me?

Sorry about my English.:->

Thanks.

Re: MessageBox.Show() ?!

Anonymous4-Mar-05 7:05

Anonymous

4-Mar-05 7:05

your call seems to be ok.

perhaps you should try the other variants of MessageBox.Show(...);

MessageBox.Show("test");
MessageBox.Show(this,"test","ddddd"); //assuming this is a form or something similar
and the variants where you can define the buttons and icon ...

I can't imagine why the box should not display your text.
I have NEVER seen a MessageBox failing. It is one of the basic tools used by GUI Builders and therefore very stable.
Is the code you used really
--
MessageBox.Show("Hello World","Error");
--
or did you use a variable for the string, in this case I would blame the variable.

Good Luck

Re: MessageBox.Show() ?!

truonghongquan6-Mar-05 14:51

truonghongquan

6-Mar-05 14:51

I had similar problem with function MessageBox in my brother's Computer.

I just call funtion MessageBox.Show()
ex: MessageBox.Show("Hello World","Error")
the box has "title" = "Error" and a button.text = "".

I don't know what's wrong.

FTP Programming with .Net framework 1.1

Member 5641432-Mar-05 8:53

Member 564143

2-Mar-05 8:53

How can I programatically do simple FTP operations using .Net framework 1.1?

Re: FTP Programming with .Net framework 1.1

TylerBrinks2-Mar-05 12:10

TylerBrinks

2-Mar-05 12:10

Everything you need is in the System.Net and System.Net.Sockets areas of the framework. Do a search on Google for c# (or vb.net) FTP. There are plenty of samples that show a simple asycn FTP client.

Modifying Design time behavior

Teflon2-Mar-05 0:50

Teflon

2-Mar-05 0:50

hi all

I have a interesting problem with one of my gui's in the Forms Designer in VS2003.

When I open the form in design view my studio crashes with a Stack Overflow Exception.
When I analyze the crashed process I can see that it is executing one of the constructors of my data and comunication model classes.
Call Stack shows that these were created because the constructor of my Form registers some methods to events in the model.

The crash could be related to the fact that the model is unmanaged code provided by wrapper clases.

The crash is 100% reproduceable.

(uneccessary to say, under normal runtime conditions the same code works fine)

One solution would be to prevent this snip of code (the data and communication classes) to be executed in design time.

I don't believe it is neccessary to create an instance of them.

How can I detect that my code is executed in the designer oposed to normal execution.
I found some hints about providing custom designers and thereby changing the behavior, but issent there simply somewhere a boolean I can read, saying designtime/normal?

Re: Modifying Design time behavior

Mathew Hall3-Mar-05 21:01

Mathew Hall

3-Mar-05 21:01

How can I detect that my code is executed in the designer oposed to normal execution?

You can use the components DesignMode property (MSDN link[^])

public MyForm()<br />
{<br />
...<br />
<br />
// don't execute this stuff at design time <br />
// cause we'll crash and burn<br />
if (!this.DesignMode)<br />
{<br />
...<br />
}<br />
}

"I think I speak on behalf of everyone here when I say huh?" - Buffy

Re: Modifying Design time behavior

Teflon_004534-Mar-05 6:57

Teflon_00453

4-Mar-05 6:57

seams to be what I was searching for,

could not invertigate whether this solves my problem, because I have implemented a workaround.
Will test it on monday.

Thx

Bmp to Png Conversion

tosun1-Mar-05 14:35

tosun

1-Mar-05 14:35

All,

I converting a bmp to png using the System.Drawing.Image.Save function by passing the format PNG. Now the problem is .NET framework seems to be using zlib compression level 6 by default. If I use a command line program like pngcrush at compression level 9 I get smaller png files.

Now, is there a way to make .NET framework api produce smaller size png files?

thanks,

--serkan

.Net Macros

jGuild1-Mar-05 10:54

jGuild

1-Mar-05 10:54

Does anyone know of a way to detect what shortcut key was used to invoke a .Net Macro?
I'm trying to take different actions based on CTRL-key vs CTRL-SHIFT-key.

Thanks,

Jim

.NET Framework Book

PaulCurry1-Mar-05 8:37

PaulCurry

1-Mar-05 8:37

Hi all

I am in college , and we are not spending a lot of time on the framework

We are mostly staying on the basics of coding, structures, etc.

I wanted to pick up a solid book on the framework, 1.1 or higher

Any suggestions

Thanks
Paul

Re: .NET Framework Book

carlop()2-Mar-05 5:53

carlop()

2-Mar-05 5:53

"Applied Microsoft .NET Framework programming" by Jeffrey Richter is a very good book that deepely covers both the framework and the CLR from a general point of view (strings, events, assemblies, GAC, Garbage collector, ..), it uses C# and IL to show some code snippet, there's nothing about windows forms, XML, ADO.NET and so on.

paco

List Of Domains

Iftach Smith1-Mar-05 2:53

Iftach Smith

1-Mar-05 2:53

Hi,
I am trying to list out the domains on the server using System.DirectoryServices. It gives domains, but list contains only one domain name. Our server has more that 3 domains and subdomains.

The code which i am using is as follows:

<br />
private StringCollection GetDomainList() <br />
{ <br />
  StringCollection domainList = new StringCollection(); <br />
  try <br />
  { <br />
    DirectoryEntry en = new DirectoryEntry("WinNT://"); <br />
    // Search for objectCategory type "Domain" <br />
    DirectorySearcher srch = new DirectorySearcher("objectCategory=Domain"); <br />
    SearchResultCollection coll = srch.FindAll(); <br />
    // Enumerate over each returned domain. <br />
    foreach (SearchResult rs in coll) <br />
    { <br />
      ResultPropertyCollection resultPropColl = rs.Properties; <br />
      foreach( object domainName in resultPropColl["name"]) <br />
      { <br />
        domainList.Add(domainName.ToString()); <br />
      } <br />
    } <br />
  } <br />
  catch (Exception ex) <br />
  { <br />
    Trace.Write(ex.Message); <br />
  } <br />
  return domainList; <br />
} <br />

Is it the correct way to list the domains? It is giving only the domain name in which i am a user and i log in with this user. This domain has subdomains and also along with this other domains are also there.

Can you please help out?

Thanx
Iftach

is setting an object reference atomic?

Member 168528-Feb-05 21:51

Member 1685

28-Feb-05 21:51

Imagine the following scenario:
A shared member variable "TheResult" is null.
A worker thread sets this variable with the result of its computation (and terminates).
Another frequently running thread checks for this variable beeing null or not. If it is not null, it assumes the worker thread has assigned a valid object to it and uses it.
Do I need to monitor the access to that variable, i.e. use lock in C#? Or in ohter words, can the assignment "TheResult = TempResult" be preempted, so that "TheResult" is neither null nor a valid object reference? Is the assignment of an object an atomic instruction that cannot be interrupted?
Thank for any hints.

Re: is setting an object reference atomic?

S. Senthil Kumar1-Mar-05 9:13

S. Senthil Kumar

1-Mar-05 9:13

Assigning a reference is atomic, AFAIK. But I think you need to declare "TheResult" volatile, as you are modifying its value from a different thread while frequently checking it for null value. If it is not volatile, there is a chance that checking thread reads null even *after* the worker thread sets it to the correct value.

Regards
Senthil
My Blog

Re: is setting an object reference atomic?

Member 16851-Mar-05 9:49

Member 1685

1-Mar-05 9:49

Thanks Senthil,
I would have missed "volatile" without your hint (although missing the result wouldn't have been a big problem in my context). I probably will have to use Interlocked.Exchange, just to be sure it is atomic, because I don't find a guarantee.
Gerhard

Re: is setting an object reference atomic?

S. Senthil Kumar1-Mar-05 16:01

S. Senthil Kumar

1-Mar-05 16:01

If moving a 32 bit value is atomic, then setting a reference is. I think it should be atomic in x86 processors, as it can written as a single
mov ax, val
assembly instruction. And processor instructions are atomic, AFAIK.

Regards
Senthil
My Blog

Windows Forms ListBox "GetItemValue" method

dxlee28-Feb-05 8:48

dxlee

28-Feb-05 8:48

In Windows Forms the ListBox class has a GetItemText method, but lacks a GetItemValue method. How to retrieve the associated value of any specified item? There is a SelectedValue property. That does not work for me because I need to get the value for any item without changing the selection of the listbox.

Actually I was using the checkedListBox class. At a certain point in the program I want to get the associated values for the items the user put a check mark on.

Thanks for your help

MDI Window

Small Rat28-Feb-05 4:46

Small Rat

28-Feb-05 4:46

Hi everybody,

When I put a DataGrid control at the MDI parent window(VS.NET), I can use form.show() to display the Child window (after I call the show function, there is nothing at the MDI client area).

Does anybody know how to solve the problem. I really want to keep the datagrid control at the parent window, and meanwhile let the Child window show out.

Please help me!!!

Thank for any help in advance!

Alan Shen

Alan Shen

MCAD for .NET Version
^~^~^~^~^~^~^~^~^~^~^
Great idea is the beginging of success!

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