Re: General question about allocate memory in .NET - .NET (Core and Framework) Discussion Boards

Adrian Cole6-Apr-09 8:52

6-Apr-09 8:52

Yeah, I guess I was just too stubborn to have it sink in. For those that care, creating a class that derives from System.ValueType isn't allowed ... 'TestNamespace.TestClass' cannot derive from special class 'System.ValueType'.

Problems when reimplementing c# class to f#

Ravadre3-Apr-09 11:54

Ravadre

3-Apr-09 11:54

Hello,
Recently I've decided to rewrite some of my C# code to F# (pratice, learn, maybe move and optimize some code for future). Unfortunately I've faced few problems.
Let's say I have a c# class that looks like this:

public class MersenneTwister : Random
{
    private const int N = 624;
    private uint[] mt = null;

    public MersenneTwister(uint seed)
    {
        mt = new uint[N]
        mt[0] = seed & 0xffffffffU;
        for (int mti = 1; mti < N; ++mti)
        {
             mt[mti] = (69069 * mt[mti - 1]) & 0xffffffffU;
        }
    }
}

I have no idea how to create constants like N - I could write static let N = 24 but:
- After compilation, c#'s version does replace N with number, as consts should work, f# does not (it uses static field to represent N)
- I can't use static let if I don't have implicit constructor for type, and I can't have one, because my constructor has to implement some code.
I have to create mt array as mutable, but I can't use let (no implicit constructor), if I use member x.mt : uint32 array = Array.create N 0u instead, new array will be created each time I use mt property.

I will be grateful for any ideas.
I also must add that, I can't believe so many people say f# is much more expressive and easier then c#, I'm trying to learn it, but for now, each time I want to do something my way, I have to search informations in books and/or google a lot Frown | :(

Re: Problems when reimplementing c# class to f#

Kevin McFarlane3-Apr-09 12:42

Kevin McFarlane

3-Apr-09 12:42

Ravadre wrote:
I can't believe so many people say f# is much more expressive and easier then c#

It's more expressive but it is certainly not easier.

Kevin

General question about allocate memory in .NET

Yanshof3-Apr-09 7:05

Yanshof

3-Apr-09 7:05

I wander - if i write those two lines

a. Object o1;
b. o1 = new Object();

1. In line a - the o1 is initialized to null - is this pointer will be allocate on stack in this place ?

2. when i write "new Object()" ( line b )- is in this step i allocate the new object on the heap ?

Thanks.

Re: General question about allocate memory in .NET

Luc Pattyn3-Apr-09 7:24

Luc Pattyn

3-Apr-09 7:24

assuming both statements are inside some method:
1. yes the pointer resides on the stack, and no it is not initialized; only class members get initialized to zero/null/Nothing
2. yes

I suggest you buy and study a tutorial book on one of the .NET languages; it will explain it all, step by step, in a systematic way.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
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Re: General question about allocate memory in .NET

led mike3-Apr-09 8:31

led mike

3-Apr-09 8:31

Luc Pattyn wrote:
I suggest you buy and study a tutorial book on one of the .NET languages

That horse is whipped to death, burned, bombed with a fatboy stuffed into a capsule and sent catapulting through space towards the sun. In short, that horse is way way so dead my good fellow.

Beer | [beer]

ITS FRIDAY!!!!! Laugh | :laugh:

Re: General question about allocate memory in .NET

Luc Pattyn3-Apr-09 8:45

Luc Pattyn

3-Apr-09 8:45

one down, a gazillion more to go.
It takes more to stop them all.

Sheep | [baah]

O heck, wrong animal, I'll have to keep trying.

Luc Pattyn [Forum Guidelines] [My Articles]

Re: General question about allocate memory in .NET

harold aptroot3-Apr-09 13:10

harold aptroot

3-Apr-09 13:10

Like Luc said, it depends on where you write them.
And o1 is not initialized to anything, meaning it could have Any value (leftover bits from values that used to be on the stack but are now just hanging around), but you're not allowed* to use it (it's an error if you do, will not compile) so you won't see this value.

* well, there is unsafe code. In all the test I did (not that many..) it was just 0 anyway but that's not something I'd rely on.

count save

AARONDAS3-Apr-09 6:42

AARONDAS

3-Apr-09 6:42

Hello I'm a beginner with VB, and I was wondering if someone can help me?

How can you count and display the amount of times that the save button is clicked?

Thank you in advance, Aaron

Re: count save

led mike3-Apr-09 8:33

led mike

3-Apr-09 8:33

AARONDAS wrote:
Hello I'm a beginner with VB

Hopefully your plan for learning computer programming is not based on the notion of using internet forums as your source of instructional materials. If it is your plan you should either change it or give up. The choice is yours of course.

Re: count save

Luc Pattyn3-Apr-09 8:49

Luc Pattyn

3-Apr-09 8:49

You excel at avoiding words such as buy, book, and study. Ran out of horses?

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: count save

dojohansen9-Apr-09 5:05

dojohansen

9-Apr-09 5:05

Actually it's fairly straightforward.

You start with one. Then comes two. Three. Four. Five.

How far do you need to count?

Re: count save

kumarnitesh6-Apr-09 1:19

kumarnitesh

6-Apr-09 1:19

Hi,
do as below for displaying number of count of click event.

Public Class Form1
Public count As Integer

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
count += 1
Me.Label1.Text = count.ToString()

End Sub
End Class

Resolving the full type name

Vipul Mehta3-Apr-09 2:46

Vipul Mehta

3-Apr-09 2:46

Hi,

We are writing an WPF application using .NET 3.5 with Enterprise Library 4.1. We have created an custom handler - UIExceptionHandler within our exe project. When we try to invoke the ExceptionPolicy.HandleException(e, "UI Message Policy"); method, we encounter the below [1] error.

Find below my code for 

namespace CName.DName.AName.UI
{
[ConfigurationElementType(typeof(CustomHandlerData))] 
public class UIExceptionHandler : IExceptionHandler 
{
public UIExceptionHandler(NameValueCollection ignore) 
{
}

public Exception HandleException(Exception exception, Guid handlingInstanceId) {
DialogResult result = this.ShowThreadExceptionDialog(exception); 
return exception;
}

// Creates the error message and displays it. 
private DialogResult ShowThreadExceptionDialog(Exception ex) 
{return MessageBox.Show("Some Error Message", "Application Error", MessageBoxButtons.OK, MessageBoxIcon.Stop); 
}
}
}

Also find below the implementation of the custom handler in the app.config file

<

add name="UIExceptionPolicy">
<exceptionTypes>
<add type="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" postHandlingAction="NotifyRethrow" name="Exception">
<exceptionHandlers>
    <add logCategory="General" eventId="100" severity="Error" title="Enterprise Library Exception Handling" formatterType="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.TextExceptionFormatter, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" priority="0" useDefaultLogger="false" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.LoggingExceptionHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Logging Handler" />
   <add type="CName.DName.AName.UI.UIExceptionHandler, CName.DName.AName.UI" name="UI Message Handler"/> 
</exceptionHandlers>
</add>
</exceptionTypes>
</add>

FYI - When I tried implementing the UIExceptionHandler custom handler class in an DLL and provided the full name in the app.config, it worked fine. But this fails when I create the handler within the exe project. The name of our exe project is Test.

What might be wrong here?

[1]
The current build operation (build key Build Key[Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionPolicyImpl, UIExceptionPolicy]) failed: The type 'CName.DName.AName.UI.UIExceptionHandler, CName.DName.AName.UI.' cannot be resolved. Please verify the spelling is correct or that the full type name is provided. (Strategy type ConfiguredObjectStrategy, index 2)

Regards,
Vipul

Regards,
Vipul Mehta

Re: Resolving the full type name

Pete O'Hanlon3-Apr-09 3:07

Pete O'Hanlon

3-Apr-09 3:07

I don't think anybody will be able to answer your question. Try wrapping it around a bit so that it fits on the page.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Resolving the full type name

Vipul Mehta3-Apr-09 3:37

Vipul Mehta

3-Apr-09 3:37

I got this resolved.

Within the project properties of my exe project the Assembly name was set as Test. So within the UIExceptionHandler class, I had to change the namespace from namespace CName.DName.AName.UI to namespace Test and this resolved the issue

Regards,
Vipul Mehta

Idea behind Chinese PinYin in c#

dhanaid3-Apr-09 1:56

dhanaid

3-Apr-09 1:56

hai all

I want chinese characters to suggest in intelligence when typing.
An exe available from google named "googlePinYinInstaller.exe".
It will suggest chinese characters.

I want the idea behind this pinyin.
How i can do this in c#.
Thumbs Up | :thumbsup:

thanks in advance

Re: Idea behind Chinese PinYin in c#

dhanaid3-Apr-09 1:59

dhanaid

3-Apr-09 1:59

How IMEMode of each control is used for this concept?
Any idea

.NET Database Migrations

AntonGogolev2-Apr-09 21:38

AntonGogolev

2-Apr-09 21:38

Hi there! I've just released an Alpha 1 of a new .NET database migration toolkit and hope you'll find it interesting.

It's pretty much inspired by Ruby on Rails (namely, ActiveRecord Migrations). Most notable features are: a special DSL for writing migrations

migration "Oxite" revision => 1:   
    version 20090323103239:
        oxite_Language:
            LanguageID type => Guid, nullable => false, primary-key => true
            LanguageName type => AnsiString, length => 8, nullable => false
            LanguageDisplayName type => String, length => 50, nullable => false

            index "" columns => [LanguageName, [LanguageDisplayName, desc]]

automatic version tracking, automatic generation of "downgrade" migrations and generally a very seamless experience while dealing with the DB.

Project is open-source (MIT License) and is available at http://code.google.com/p/octalforty-wizardby/[^]

Re: .NET Database Migrations

Eddy Vluggen2-Apr-09 22:11

Eddy Vluggen

2-Apr-09 22:11

A post about this technology is less effective than a fullblown-article; here it might even attract flames, since it's not a programmingquestion.

An article OTOH doesn't have to contain a question, but can also be used to introduce new idea's or frameworks. Plus they're easier to find through Google Wink | ;)

I are troll Smile | :)

MS Visual Studio 2008 pro vs MS Visual Studio 2005

Senthil S2-Apr-09 18:46

Senthil S

2-Apr-09 18:46

Hi,

Can any one tell the difference between visual studio 2008 pro with MS Visual Studio 2005.

I want to migrate my code from Visual studio 2005 to visual studio 2008 pro.

What kind of problem i will face if i did so...

Please guide me.

Thank in Advance

Senthil.S
A Software Engineer

Re: MS Visual Studio 2008 pro vs MS Visual Studio 2005

Anubhava Dimri2-Apr-09 21:38

Anubhava Dimri

2-Apr-09 21:38

You can read from Microsoft msdn site http://msdn.microsoft.com/en-us/library/bb386063.aspx.

if you are migrate your code to VS05 to VS08 then you have face some new problem.

Like : Functions, Methods which have a new name and new definiction.

Best Regard
Anubhava Dimri

mailto: anubhava.prodata@gmail.com

Re: MS Visual Studio 2008 pro vs MS Visual Studio 2005

dojohansen9-Apr-09 5:10

dojohansen

9-Apr-09 5:10

You will certainly not have any problems with new method names. First, VS-2008 allows you to choose which FrameWork version you want to target. Second, the 3.5 FrameWork is in fact the 2.0 FrameWork plus additional libraries - it is not a new version of the 2.0 libraries.

Perhaps it is possible to have issues when migrating but I've seen none. And that is very much the opposite of what was the case when we migrated from 1.x to 2.0.

why the program does not execute the "Play( )" function in webservice?

lynn10072-Apr-09 2:39

lynn1007

2-Apr-09 2:39

Hi，

I'm using COM component(Axis Media Control) in .NET framework with language tool c#.

"Play()" is a member function of Axis Media Control（network camera）. When I use it in WinForm, after I execute the sentence "AMC.play()", it works all right and shows the image.

But When I try to use it in webservice ,using the sentences like "AxisMediaControl AMC = new AxisMediaControl()" and "AMC.play()",after execute the "play()", it doesn't show any thing nor occur errors. I don't why. I wonder if in webservice there doesn't have any place to show the image( not like in winform can add the control in [design] ) , or if i need to offer a place or window to show the image in webservice.

I also want to know the difference between webservice and winform when using the axis media control. Thanks!!

Re: why the program does not execute the "Play( )" function in webservice?

led mike2-Apr-09 4:52

led mike

2-Apr-09 4:52

lynn1007 wrote:
it doesn't show any thing

Show it where? A WebService has no display to display anything on.

lynn1007 wrote:
I don't why.

Hopefully my first comment clears that up for you, yes?

Also someone developing a WebService that doesn't already know this, indicates they are working on a subject that they don't understand anywhere near well enough to be working on it. I mean rather than developing a WebService you should be reading, studying the subject to understand it clear enough before developing.

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