Re: sorting arraylist of custom objects - C# Discussion Boards

Memory Consumption

abcurl9-Dec-09 0:44

abcurl

9-Dec-09 0:44

string str = null;
can u tell, In the above line of code, what shall be teh memory consumption by the variable str

Re: Memory Consumption

Rob Philpott9-Dec-09 0:56

Rob Philpott

9-Dec-09 0:56

Well, str is a reference type which doesn't reference anything, so it will be just the size of reference itself. I think this will be 4 bytes for the reference itself, and a further 8 for synchronisation and other .NET internal stuff. So, likely 12 bytes.

Regards,
Rob Philpott.

Re: Memory Consumption

abcurl9-Dec-09 1:07

abcurl

9-Dec-09 1:07

Rob Philpott wrote:
and a further 8 for synchronisation and other .NET internal stuff.

Can u please tell where should i read the detailed meaning of the above quoted line ?

Re: Memory Consumption

Rob Philpott9-Dec-09 1:11

Rob Philpott

9-Dec-09 1:11

Actually, I got that wrong. The extra 8 bytes would be on the heap if your reference was not null. So, just 4 bytes on a 32bit machine. Trying to find a good reference for this stuff now.

Regards,
Rob Philpott.

Re: Memory Consumption

Rob Philpott9-Dec-09 1:19

Rob Philpott

9-Dec-09 1:19

Can't find anything on the net I'm afraid. I'm sure there's lots out there if you look around though. Also, consider reading one of Jeffrey Richters books - they are excellent on this sort of stuff.

Regards,
Rob Philpott.

Re: Memory Consumption

abcurl9-Dec-09 1:22

abcurl

9-Dec-09 1:22

Thanks a lot.

sorting arraylist of custom objects

Shameer E.A.9-Dec-09 0:36

Shameer E.A.

9-Dec-09 0:36

Dear techies..

Nice if you could please help me with sorting an arraylist i have which contains objects of type 'card', which inturn contains 2 enums - rank and suit.

The arraylist normally contains 7 card objects. eg :

spades 3, hearts 4, spades 1, diamonds 4, spades 2, clubs 4, spades 4

The sorted arraylist should be like:

spades 1,spades 2,spades 3,spades 4,clubs 4,hearts 4,diamonds 4 - with the suits together with sorted ranks

Many thanks in advance..

Re: sorting arraylist of custom objects

Abhinav S9-Dec-09 0:44

Abhinav S

9-Dec-09 0:44

Use a sorted list instead of an array list(http://msdn.microsoft.com/en-us/library/system.collections.sortedlist.aspx[^].

Re: sorting arraylist of custom objects

Rob Philpott9-Dec-09 1:03

Rob Philpott

9-Dec-09 1:03

You want to call .Sort on your ArrayList, the problem being though that Sort doesn't know how to compare two cards in order to do the sort.

To tell it this, you'll either need to extend 'card' to implement IComparable, or create a new seperate class which implements IComparer. Either way, you'll need to create a method which compares two cards. Compare suits first, and then if they are the same, the 'rank'.

Regards,
Rob Philpott.

Application Freeze

musefan9-Dec-09 0:29

musefan

9-Dec-09 0:29

Hi all,

I have an application (C# .Net WinForms) problem I am finding it difficult to solve, hopefully you guys will have some ideas...

This issue is that sometimes the application will freeze, by that I mean completely unresponsive - like if you perform long tasks on the UI thread. (I use BackgroundWorkers for a number of tasks when required)

Sometimes, I will get a message saying the application has stopped responding with little information I have found use of - it's an 'AppHangB1' error

The problem will occur regardless of which form is open, even a very basic one with little functionality (and no background workers)

I can recreate the issue two ways (not on all machines I tried thou) - If the system is idle an the station becomes locked, the application freezes when logging back in (not 100% of the time thou). The second method is too open internet explorer for a few seconds and then close/minimise, this causes the application to freeze (does not apply on a second machine I tested)

If any one has any ideas or pointers as to what I should be looking for then your responses will be much appreciated.

Thanks

Life goes very fast. Tomorrow, today is already yesterday.

Re: Application Freeze

Member 33524189-Dec-09 0:43

Member 3352418

9-Dec-09 0:43

Hi musefan,

If this is not happening on all the PC's as you said; it might be due to

1) Memory problem (memory leak); check for memory hungry applications running.
2) OS update differe (Check for difference on the PC it is not happening)
3) Check for cross-loops creating infinit loop if any in your code.
4) Also might cause due to virus problem.

Regards,

Maruti

Re: Application Freeze

musefan9-Dec-09 1:08

musefan

9-Dec-09 1:08

Hi,

Thanks for your reply. In response to your suggestions...

1) I have 3GB memory installed, at at the time of freezing no applications are using excessive amounts of memory. Total usage around 45%

2) When I said not happening on other PC, I meant when I can recreate with internet explorer open/close - This issue itself has occurred on all tested machines at some point

3) The freeze occurs on a basic form not long after start-up, when I create the freeze in debugging mode and then pause the process. The highlighted code is Application.Run in the Program.cs file. I would have thought if an infinite loop error then It would shown a line of code in the loop, - well if on the UI thread, a background thread infinite loop should not freeze the UI thread though surely

4) Due to it only freezing my application and on multiple machines, I think a virus is unlikely (Unless you include Vista as a virus Laugh | :laugh:

)

Thanks again

Life goes very fast. Tomorrow, today is already yesterday.

Get Control at Point in another Window

Programm3r9-Dec-09 0:18

Programm3r

9-Dec-09 0:18

Hi all,

I am trying to get hold of a control (context menu item) that the user has clicked on in another window. Let me explain some more:

I have wrote a VSTO add-in which has a mouse and keyboard hook. The hook checks for any combination of shift+delete. So in Outlook, when the user right clicks on an item, then holds the Shift key in while clicking the Delete context menu item the hook fires, but it will fire even if the user hasn't selected any items. Frown | :(

It will fire on every Shift(Key) + Right Mouse button click ... this is not right Thumbs Down | :thumbsdown:

So I am trying to get hold of the "Delete" context menu item within Outlook so that I can know when the user is actually trying to delete something.

Any suggestions?
Many thanks in advance.

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Save Download DLL File

dataminers8-Dec-09 23:55

dataminers

8-Dec-09 23:55

How can I save DLL file to database and download DLL file from database in C#.

I want to save DLL file binary format in database.

Note: I use MS SQL Server 2008.

Thanks...

Re: Save Download DLL File

N a v a n e e t h8-Dec-09 23:57

N a v a n e e t h

8-Dec-09 23:57

Keep it in a varbinary(max) column. BTW, keeping a DLL file in database seems to weird.

Best wishes,
Navaneeth

Re: Save Download DLL File

Abhinav S9-Dec-09 3:26

Abhinav S

9-Dec-09 3:26

Very weird !!

Socket.ReceiveTimeOut Problem

lnmca8-Dec-09 23:35

lnmca

8-Dec-09 23:35

Hi All,

When I set the ReceiveTimeOut of Socket to some milliseconds then Socket throws the timeout Exception while the period expires and the problem is that then Socket is disconnected therefore i am unable to send and receive again with this socket.
I want that it waites for sometime for receiving but after elapsing the time,it should not be disconnected so that i can use it again n again..

Plz help...Its urgent.

Best Regards,
Lalit Narayan

Re: Socket.ReceiveTimeOut Problem

Programm3r9-Dec-09 0:22

Programm3r

9-Dec-09 0:22

From MSDN:

The ReceiveTimeout property determines the amount of time that the Read method will block until it is able to receive data. This time is measured in milliseconds. If the time-out expires before Read successfully completes, TcpClient throws a IOException. There is no time-out by default.

Read more here[^].

Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Socket.ReceiveTimeOut Problem

lnmca9-Dec-09 0:27

lnmca

9-Dec-09 0:27

But when the socket throws exception ,socket is disconnected...this creates the problem 4 me,plz give the solution so that the socket should not be disconnected.

Best Regards,
Lalit Narayan

Re: Socket.ReceiveTimeOut Problem

Programm3r9-Dec-09 0:44

Programm3r

9-Dec-09 0:44

I think that is what happens when the time-out period is exceeded, the Receive method will throw a SocketException. Have you tried catching the exception, checking whether the socket is still connected (see here[^]), if not try to reconnect...

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Socket.ReceiveTimeOut Problem

lnmca9-Dec-09 0:57

lnmca

9-Dec-09 0:57

Hi,

Actually i am working on Server Side,the connection requests comes from the Client Side,i can not reconnect to the Client through Socket....
The Server has TCP Listener on its own side,that waits for the Connection Request from the Client and make the Socket after Accepts the request.

Best Regards,
Lalit Narayan

Re: Socket.ReceiveTimeOut Problem

Programm3r9-Dec-09 1:10

Programm3r

9-Dec-09 1:10

As far as my understanding of TCP/IP clients and server(s) goes; it is the client initiates the connection. So, if the client disconnect in any way from the server, when it is the clients 'responsibility' to reconnect to the server.

Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Socket.ReceiveTimeOut Problem

lnmca9-Dec-09 1:14

lnmca

9-Dec-09 1:14

Hi,
The Client Side Code is written in C at Embeded Side n it takes some time to show the status "Disconnected" this creates the problem 4 me,they find the state of Socket "Connected" while it is disconnected at Server Side...
Plz do the needful.

Thanks and Regards,
Lalit Narayam

Re: Socket.ReceiveTimeOut Problem

Programm3r9-Dec-09 1:21

Programm3r

9-Dec-09 1:21

Well it seems to me that the embedded side needs some works?! Sniff | :^)

lnmca wrote:
The Client Side Code is written in C at Embeded Side n it takes some time to show the status "Disconnected" this creates the problem 4 me,they find the state of Socket "Connected" while it is disconnected at Server Side

You cannot build on something if it is not working correctly.. Dead | X|

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Socket.ReceiveTimeOut Problem

Paulo Zemek9-Dec-09 2:31

Paulo Zemek

9-Dec-09 2:31

Well, I think you can't do that.
Imagine the situation:

Server starts reading.
Client starts sending. But, for some reason, the connection is VERY slow.
Server then receives the time-out (imagine it does not disconnect).
The server then asks for more data... but, the client is still sending the old-data. So, the server must now wait for what? The old data? The new data? How will it differentiate one data from the other?

I think the fact the connection is closed is on purpose. If you want, I think you may NOT use the ReceiveTimeOut. Instead, create another thread to call "abort" in the reading thread if it takes too long, so the connection will not be aborted, but I don't really know what will happen with the data in this case.

Also, depending on your requirements, it's possible to use UDP to receive the data.

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