C# Discussion Boards - CodeProject

Calla31-Mar-10 20:49

31-Mar-10 20:49

I didn't check your use of flags that thoroughly, but it looked ok. But since you only add the deny rules for the Users group I would assume an Administrator is still able to delete the folder in question.

Windows Mobile 6 zooming in a picturebox

Tripwire99930-Mar-10 23:25

Tripwire999

30-Mar-10 23:25

Hi guys i got a question for you:

I have created a windows mobile 6 app for a project at school. I have a docked picturebox and the sizemode is set to stretch.
I want to know how i can zoom into my picturebox on a specific area of the image. Like the double tap zoom in some windows mobile 6 applications. I tryed to use the sizemode.zoom but it isn't in there Frown | :(

Any help would be superb Smile | :)

Re: Windows Mobile 6 zooming in a picturebox

Ashraf ELHakim26-Jun-10 13:05

Ashraf ELHakim

26-Jun-10 13:05

Hey i dnt know the answer but u maybe got it Smile | :)

because ur ques before 3 month plz if u know the answer provide it to me because i neeed it veeeery quickly Smile | :)

thx for ur help
send on this email :
ai_elhakim@hotmail.com

Showing and interact with HTML-Pages without WebBrowser Control?

softwarejaeger30-Mar-10 21:40

softwarejaeger

30-Mar-10 21:40

Hello,

is there any solution to use another control than the standard-WebBrowser-control which is binded by the Internet Explorer?

My favourite is the WebKit, but the Problem is, that in the .NET Wrapper for the WebKit (WebKitDotNet) isn't any way to interact with the page over InvokeScript() and ScriptableObjects and so on...

Is there any way to find a fast and modern WebBrowser-Control, which supports the interaction with the JavaScript of the page?

It would be great if there's something, which is able to run on Mono too.

Thanks for your help =)

Re: Showing and interact with HTML-Pages without WebBrowser Control?

Abhinav S30-Mar-10 21:45

Abhinav S

30-Mar-10 21:45

Found this[^] on CP. May be useful to you.

Me, I'm dishonest. And a dishonest man you can always trust to be dishonest.
Honestly. It's the honest ones you want to watch out for...

Sessions in C# Desktop Application

Anil Kumar.Arvapalli30-Mar-10 20:27

Anil Kumar.Arvapalli

30-Mar-10 20:27

Iam developing a Desktop Based Application. Where user logins into it in Form1. I have to retrvie Information on Logged in Profile Name in Form 6, I have to get the Username in Form6. How to hold the Username, any Solution for it.

As of now iam using a text file and reading from it when required... Please Help me....

Re: Sessions in C# Desktop Application

Khaniya30-Mar-10 20:41

Khaniya

30-Mar-10 20:41

As I understand you are confuse with session on web. There is nothing like session in Desktop Application.
Here you can use OOP fundamental by making entiry(class) of user profile and pass reference to every form where you need it

I know this is not enough but I need more proper description.

Thanks
Smile | :)

Life's Like a mirror. Smile at it & it smiles back at you.- P Pilgrim
So Smile Please

Re: Sessions in C# Desktop Application

OriginalGriff30-Mar-10 22:04

OriginalGriff

30-Mar-10 22:04

It depends on what kind of app you are producing: multi-machione, or single.
For multiple machines, the obvious solution is to use a small database, if you can install either MSSQL express or MySql on the relevant machines. If not, then consider an XML file via datasets, but be aware that you will have to cope with multi-user problems yourself, if you are using a central repository for several machines.
If it is just multiple persons login in on a single machine, and no networked connection is expected, then I would suggest the App.Config file, or in desperation the Registry.

You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace

C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy

Storing and Retrieving Image in Access

Anil Kumar.Arvapalli30-Mar-10 20:24

Anil Kumar.Arvapalli

30-Mar-10 20:24

I want to store Image and retrieve image From Access Database... Please Suggest the Process or else any link so that i will end u with a Solution... And more over what type of Datatype i have to take in Access DB, is it OLEDB or any other.... Thnks

Re: Storing and Retrieving Image in Access

Dan Mos30-Mar-10 21:52

Dan Mos

30-Mar-10 21:52

Hy,

Use a Raw binnary format or BLOB Long Var Binnary.

Meaning a byte[] in C# and a VarBinary in OleDb.

Heres a example: http://support.microsoft.com/default.aspx?scid=kb;en-us;317016&Product=vcSnet

Synchnroization with lock statement

xkrja30-Mar-10 20:23

xkrja

30-Mar-10 20:23

A couple of days ago I asked here how to ensure that a generic list isn't modified while an operation like Find() or Exist() is performed on the list. I was recommended to use the lock-statement.

Now I would like to know if it's enough to lock the list while adding or removing items from it? Or do I need to lock it while performing a non-changing operation like Find() on the list as well?

Thanks for help!

Re: Synchnroization with lock statement

SeMartens30-Mar-10 21:26

SeMartens

30-Mar-10 21:26

Hi,

you have to use the lock-statement while adding and removing and also for non-changing operations.

The lock-statement is like a monitor (imagine a gatekeeper) that allows execution of a critical code block. So to be sure if you have several critical blocks that only one block is executed at one time you have to use the same gatekeeper for all blocks.

Example:

<br />
// declare a lock-object (the gatekeeper)<br />
private Object thisLock = new Object();<br />
<br />
public void AddItem(object item) {<br />
  lock(thisLock) {<br />
     // add to the list<br />
  }<br />
}<br />
<br />
public object FindItem(object criteria) {<br />
  lock(thisLock) {<br />
     // search within the list<br />
  }<br />
}<br />

Be pay attention that all access to the list is within a lock-statement using the same object (gatekeeper).

Hope this helps a bit.

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Synchnroization with lock statement

xkrja30-Mar-10 22:10

xkrja

30-Mar-10 22:10

Thanks for the reply!

You're right. I did a test and tried it out. But is there some way around this? So while a non-changing operation is performed on the list other non-changing operations can get access to the list as well? So that only modifications to the list can be stopped while theese non-changing operations is happening to the list?

The reason is I'm creating a WCF service and each client contacts the service on a different thread. Each time a clients calls a method on the service the list is searched. This means if several hundreds of clients are connected every thread is locking the list and it takes some time to search there will be a real performance decrease.

A solution I guess is to wrap all non-changing operations in try-catch blocks and skip the lock but that seems like a real hack!

EDIT: It's a static list we're talking about in this case.

Thanks again!

Re: Synchnroization with lock statement

SeMartens30-Mar-10 22:21

SeMartens

30-Mar-10 22:21

Yup, this solution is a real hack. But the problem you refer to is the reader/writer problem. And guess what, the framework contains a solution for this called the ReaderWriterLock:

http://msdn.microsoft.com/en-us/library/system.threading.readerwriterlock.aspx[^]

Didn't used it myself but it seems easy to utilize.

It doesn't matter if it is a static list as long as you are using static methods to access the list (using a static monitor).

EDIT: I have to correct myself: You don't need static methods. All you have to do is using a static monitor (gatekeeper).

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Synchnroization with lock statement

xkrja30-Mar-10 22:26

xkrja

30-Mar-10 22:26

I found it just before I saw your answer Smile | :)

It seems there are two solutions: ReaderWriterLock and ReaderWriterLockSlim.

It seems to exactly what I need!

Thanks for your help!

ProgresBar

Anil Kumar.Arvapalli30-Mar-10 20:20

Anil Kumar.Arvapalli

30-Mar-10 20:20

Iam Using 2 Threads in My Application. 2 Threads has to Update the single Progress Bar, so that user will come to know when the Process is completed. iam very nave to C# can some body help me out regarding this Please.... Thanks in Advacne.....

Or else Please suggest some Sample....

Re: ProgresBar

Khaniya30-Mar-10 20:24

Khaniya

30-Mar-10 20:24

You can use this for update UI(progressbar) in thread

http://www.codeproject.com/tips/67548/Changing-a-WinForms-Control-on-the-UI-Thread-from-.aspx[^]

and for synchronization you can use lock block in your application

Smile | :)

Thanks

Life's Like a mirror. Smile at it & it smiles back at you.- P Pilgrim
So Smile Please

Play sound

jojoba201130-Mar-10 20:06

jojoba2011

30-Mar-10 20:06

I am writing a reminder software and now i want to play mp3 file when alerting the reminder to the user !

I have done something for wav file to play in background without opening an software.

Now my Question is that how to play Mp3 file form Alert without opening any software like windows Media Player!

Re: Play sound

Khaniya30-Mar-10 20:18

Khaniya

30-Mar-10 20:18

you can convert your wav file into executable. some free software available on net

http://www.f2ko.de/English/a2e/download.php[^]

thank you

Smile | :)

Life's Like a mirror. Smile at it & it smiles back at you.- P Pilgrim
So Smile Please

Re: Play sound [modified]

jojoba201130-Mar-10 21:10

jojoba2011

30-Mar-10 21:10

your solution is diffrent from my Question!

modified on Wednesday, March 31, 2010 3:45 AM

Re: Play sound

Kristian Sixhøj31-Mar-10 0:14

Kristian Sixhøj

31-Mar-10 0:14

How big/long is the mp3 file?

If it isn't too big, I'd suggest converting it to a wave file, then using the SoundPlayer class[^] to play it.

Note that the filesize will increase when converting from mp3 to wav.

If you insist on keeping the file as an mp3, have a look at this article:
MP3 Player for Windows 7[^]

Kristian Sixhoej
"Invisible women out to kill ya - Oh, great!"

Xml Deserialization

VCsamir30-Mar-10 19:43

VCsamir

30-Mar-10 19:43

hi friends,

i am using xmlclass serailization to read the Xml File

///<Order xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" orderId="1" version="3.1.0" xmlns="http://www.abc.com/schemas/imaging/rps/order/2007/01/" ///>

</order>

XmlTextReader reader = new XmlTextReader(filename);

try

{

XmlSerializer serializer = new XmlSerializer(typeof(Class_name));

Class_object = (Class_name)serializer.Deserialize(reader);

reader.Close();

}

catch (Exception e)

{

reader.Close();

return;

}

it says that "{<Order xmlns='http://www.abc.com/schemas/imaging/rps/order/2007/01/>' was not expected."}"

my class defination is as follows

[XmlRoot("Order")]

public class Class_name

{

[XmlAttribute]

public string orderId;

[XmlAttribute]

public string version;

//default constructor

}

}

Can Anyone help me to resolve this!!

Re: Xml Deserialization

Arun Jacob30-Mar-10 20:09

Arun Jacob

30-Mar-10 20:09

VCsamir wrote:
Order

VCsamir wrote:
order

Opening and closing tags are not matching. XML tags are case sensitive.

Arun Jacob
http://codepronet.blogspot.com/

Re: Xml Deserialization

VCsamir30-Mar-10 21:37

VCsamir

30-Mar-10 21:37

hi ,

Opps sorry friends..
The opening and closing tags are matching i have put "//" only because to show the example..(when i was posting the same code the <> tags were getting invisible D'Oh! | :doh:

)i have tried opening the xml in iexplorer it opens fine..

Thanks ..

Regards
Samir

Re: Xml Deserialization

Mirko198030-Mar-10 21:43

Mirko1980

30-Mar-10 21:43

You are not specifying the namespace in the XmlRoot attribute

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