Re: Weak reference and garbage collection - C# Discussion Boards

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Re: Redirecting standard output of an application

TcachTcachTcach27-Dec-10 23:12

TcachTcachTcach

27-Dec-10 23:12

Figured out, that if a native win32 console application
didn`t fflush its stdout and stderr,
redirecting its output is a real problem!

Is it possible to redirect 'bad' console apps,
(without fflush(stdout))?

Also found solution, by _Olivier_, but I don`t want to use
any stubs an 'between stuff'!

Real-Time Console Output Redirection[^]

Thank you all, for your help!

Weak reference and garbage collection

thomus0724-Dec-10 22:24

thomus07

24-Dec-10 22:24

public class MyTextBox : TextBox
      {
          private static Dictionary<IntPtr, WeakReference> mList = new Dictionary<IntPtr, WeakReference>();

          public MyTextBox()
          {
              mList.Add(Handle, new WeakReference(this));
          }
      }

Any problem for MyTextBox being garbage collected?

Re: Weak reference and garbage collection

#realJSOP25-Dec-10 0:35

#realJSOP

25-Dec-10 0:35

I recommend that you google ".net weak references". You'll get over 6.8 million results back, and there appear to be a number of good links on the first page of results.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
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Re: Weak reference and garbage collection

SledgeHammer0125-Dec-10 7:27

SledgeHammer01

25-Dec-10 7:27

If nothing has a strong reference to MyTextBox, then yeah, it could get GC'ed. Thats why its called a WeakReference. Why would you use a WeakReference here anyways?

Re: Weak reference and garbage collection

thomus0725-Dec-10 19:03

thomus07

25-Dec-10 19:03

Making it weak reference will not prevent GC to play it's role. It's static. If it's not weak reference strong references of hundreds of textboxes in my app get polluted. I just bother with the textboxes that are really alive.

Re: Weak reference and garbage collection

Pete O'Hanlon25-Dec-10 8:41

Pete O'Hanlon

25-Dec-10 8:41

If you're relying on the reference being there, then you either need something that can recreate the reference when needed, or you need to maintain a strong reference.

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Re: Weak reference and garbage collection

thomus0725-Dec-10 19:06

thomus07

25-Dec-10 19:06

I just bother with the textboxes that are really alive.

Re: Weak reference and garbage collection

_Erik_27-Dec-10 2:46

_Erik_

27-Dec-10 2:46

Objects of type MyTextBox will be collected if there are no strong references to them and, of course, the GC performs a garbage collection. mList dictionary will not be collected becouse there is a static strong reference to it, unless you clear this reference. I guess you have a static method or property to access the contents of mList Dictionary, becouse if you don't this dictionary is completely useless, and I don't see how you should need it unless MyTextBox class was much more heavy than it seems to be.

Re: Weak reference and garbage collection

jschell27-Dec-10 8:12

jschell

27-Dec-10 8:12

thomus07 wrote:
private static Dictionary<intptr, weakreference="">

What do you think is going to happen with that IntPtr when the GC collects the TextBox?

Answer this question

mohammed alshaweesh24-Dec-10 4:23

mohammed alshaweesh

24-Dec-10 4:23

How to extract any object from the image after convert it's to black and white.

Re: Answer this question

PIEBALDconsult24-Dec-10 4:31

PIEBALDconsult

24-Dec-10 4:31

If the image is of a top hat I might be able to extract a rabbit from it, otherwise it beyond my abilities. Big Grin | :-D

Re: Answer this question

OriginalGriff24-Dec-10 4:45

OriginalGriff

24-Dec-10 4:45

Boom tish!

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Re: Answer this question

Ramkumar_S24-Dec-10 19:56

Ramkumar_S

24-Dec-10 19:56

Ramkumar
("When you build bridges you can keep crossing them. ")

http://ramkumarishere.blogspot.com

Re: Answer this question

Hiren solanki24-Dec-10 21:14

Hiren solanki

24-Dec-10 21:14

Ramkumar_S wrote:
a

Regards,
Hiren.

My Recent Article: - Way to know which control have raised a postback
My Recent Tip/Trick: - The ?? Operator.

Re: Answer this question

GenJerDan27-Dec-10 3:42

GenJerDan

27-Dec-10 3:42

Null-A

Re: Answer this question

OriginalGriff24-Dec-10 21:24

OriginalGriff

24-Dec-10 21:24

Were you proposing to post a reply, with each letter in a separate message?
If so, this could take a while...

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Re: Answer this question

Abhinav S24-Dec-10 23:04

Abhinav S

24-Dec-10 23:04

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

Re: Answer this question

R. Giskard Reventlov24-Dec-10 4:40

R. Giskard Reventlov

24-Dec-10 4:40

So you think being abrupt and rude will get you an answer? Good luck with that.

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me, me, me

Only if you answer this first

Keith Barrow24-Dec-10 4:43

Keith Barrow

24-Dec-10 4:43

What is the difference between an orange?

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-
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Re: Only if you answer this first

#realJSOP24-Dec-10 7:53

#realJSOP

24-Dec-10 7:53

DAMN YOU! You beat me to it! (But I still have to give you a 5.)