Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change - C# Discussion Boards

Re: WMP

Lyon Sun14-Oct-09 20:45

Lyon Sun

14-Oct-09 20:45

Huh, Sorry, I must have read your previous post wrong. Smile | :)

If you need free source of that book, you can just google the name of that book with keyword "rapidshare", then you should have few links to be accessed. Good luck!

Sun

Application Freeze after ScreenSaver/Workstation Lock/Display Change

musefan12-Oct-09 22:10

musefan

12-Oct-09 22:10

Hi All,

As my subject may suggest, I am having a strange problem. The latest test release of my application (WinForms) will completely freeze once the screensaver is enabled, I can also replicate this by locking the computer and unlocking, also if a change display settings it happens (this I read in a post where someone else had the issue, but could not find any solutions on the few hits I managed to find.

When I say freeze, I mean completely not responsive, even to the point of it not displaying the usual 'Not Responding' text.

This was not the case in the previous test version, but I have pretty much removed everything since that last version and still an issue.

I know it's not much help, but there is so much different code that I cannot post any examples.

Has anybody seen or heard of this before that could maybe shed some light?

Thanks

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

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

benjymous12-Oct-09 22:26

benjymous

12-Oct-09 22:26

That's a common problem if you're working with DirectX (the hardware surface gets lost when you lock or go to screensaver, and needs recreating, which will break your app if it doesn't handle that)

Help me! I'm turning into a grapefruit!
Buzzwords!

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

musefan12-Oct-09 22:57

musefan

12-Oct-09 22:57

No DirectX I'm afraid

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

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

Mirko198012-Oct-09 22:44

Mirko1980

12-Oct-09 22:44

I recently had a similar problem with a Silverlight control shown in a WinApp through a WebBrowser control.
Would be nice to have some idea on how circumvent this.

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

musefan12-Oct-09 23:01

musefan

12-Oct-09 23:01

Thanks but No Silverlight, No WebBrowser control. Have only been using the same standard .Net controls I have used throughout the application. I have not added any control that I have not previously used so that shouldn't be a problem.

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

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

Mirko198012-Oct-09 23:24

Mirko1980

12-Oct-09 23:24

Yes, I understand, I was only taking advantage of your request hoping to have some answer to my issue too.

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

musefan13-Oct-09 1:55

musefan

13-Oct-09 1:55

Fixed my issue, see my answer. Not sure it will help you with yours thou but maybe an idea of what to look for

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

Re: Application Freeze after ScreenSaver/Workstation Lock/Display Change

musefan13-Oct-09 1:54

musefan

13-Oct-09 1:54

I found the problem. Basically the issue is with a static function I am using that converts RichText to plain text. This function was failing when being called from a background worker (which must be starting when the windows display changes, but that'a a different bug)

The function uses a RichTextBox to do the conversion, I have now added a line of code to Dispose() the RTB before returning the function and problem solved. I don't know the technical details behind why it cause a problem but hopefully this may help anyone with a similar issue.

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

Outlook-like scheduling control (chart) [modified]

Programm3r12-Oct-09 21:56

Programm3r

12-Oct-09 21:56

Hi all,

Some background info: I am trying to represent free/busy information for boardrooms.

I am looking for a control similar to the one found within Outlook appointment scheduling, with one extra addition, it must be displayed as a chart Sniff | :^)

(scheduling chart). I have looking through the CP articles, but can only locate ASP like controls. Does anyone perhaps have a bookmark or something useful that can point me in the right direction?

Many thanks in advance
Kind regards,

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

Programm3r
My Blog: ^_^

modified on Tuesday, October 13, 2009 6:10 AM

Thread Control Dillema

xiviliae12-Oct-09 21:52

xiviliae

12-Oct-09 21:52

I believe this may be a threading issue that i need better understanding with, please.

I have a WorkerClass, that takes in various parameters and then calculates complex math over multiple CPU cores (threaded). It builds an array of data used elsewhere in app. this part works great.

The problem is that i may need up to 100 instances of this class, and im not sure how to control the execution of this part. Heres sorta the flow im trying to get at:

Void BeginCalculation()
{
  Calc1 = new WorkerClass(param1, param2, param3);
  Calc1.Start();

  //NEED TO SOMEHOW WAIT FOR EACH CALC TO COMPLETE BEFORE MOVING TO NEXT

  Calc2 = new WorkerClass(param1, param2, param3);
  Calc2.Start();

  Calc3 = new WorkerClass(param1, param2, param3);
  Calc3.Add(Calc1.Array, Calc2.Array);

  //etc...
}

I really need to control when Calculations begin, because a few steps will combine data from previous steps. I also have the WorkerClass updating a public Status object, so i need to keep that feature in.

The only way i know how to control the flow here, is if i have a thread that is infinitely looping, and checking the thread state of the current calc instance thread. Then (on ThreadsAlive = False) calling a MoveToNextCalc() to start next. But somehow this seems like the wrong approach. Is it? Does someone have a better approach to this?

This is also using XNA, so i need to avoid tying up the Draw/Update steps, with lots of work. And really dont want tons of threads running at same time. Its currently 1 WorkerClass instance spawning 1 thread per CPU. Each thread working on a seperate section of an array.

I hope thats enough info to work with. Any help on best approach to this, greatly appreciated!

Re: Thread Control Dillema

N a v a n e e t h12-Oct-09 22:10

N a v a n e e t h

12-Oct-09 22:10

Use wait handles. Work with AutoResetEvent and WaitOne() method on that. You need to supply AutoResetEvent instance to the worker class and once operation is done, call Set() on wait handle. Here is a modified code.

Void BeginCalculation()
{
  AutoResetEvent waitHandle = new AutoResetEvent(false);
  Calc1 = new WorkerClass(param1, param2, param3);
  Calc1.Start(waitHandle);   // passing wait handle to WorkerClass so that it can call Set() on it

  waitHandle.WaitOne();

  Calc2 = new WorkerClass(param1, param2, param3);
  Calc2.Start(waitHandle);

  waitHandle.WaitOne();

  //etc...
}

Navaneeth

How to use google | Ask smart questions

Re: Thread Control Dillema

xiviliae13-Oct-09 18:23

xiviliae

13-Oct-09 18:23

Nava!

Thank you much for the quick solution. It was perfect for my needs. And helped me move closer to understanding threads! Big Grin | :-D

cheers! -ms

Re: Thread Control Dillema

Luc Pattyn13-Oct-09 3:10

Luc Pattyn

13-Oct-09 3:10

Seems like Calc.Start() launches the calculation, causing it to run asynchronously, whereas what you want is to execute it synchronously.

So you need a Calc.Run() method, which basically does what Calc.Start() does, then waits on the calculation to finish; one way to achieve that is using a WaitHandle as Navaneeth has already indicated. But you really should hide that inside your Calc class.

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Local announcement (Antwerp region): Lange Wapper? Neen!

Creating Excel files in C# witout having microsoft excel

SummerBulb12-Oct-09 21:25

SummerBulb

12-Oct-09 21:25

Hi.

I would like to write a program that creates and midifies excel files.
I don't have microsoft excel.

Can it be done without having the microsoft excel?
If so, where can i find a dll that will do the job? Microsoft.Office.Interop.Excel does not appear in the COM label of the refferences window.

Thanks!

Re: Creating Excel files in C# witout having microsoft excel

stancrm12-Oct-09 21:28

stancrm

12-Oct-09 21:28

http://support.microsoft.com/kb/897646[^]

Re: Creating Excel files in C# witout having microsoft excel

SummerBulb12-Oct-09 21:35

SummerBulb

12-Oct-09 21:35

Too good to be true.

I downloaded that lovely package, tried to install it, and got the following message: Please install Microsoft Office 2003 before installing this product.

Too bad...

Re: Creating Excel files in C# witout having microsoft excel

DaveyM6913-Oct-09 2:02

DaveyM69

13-Oct-09 2:02

Check out NPOI[^]. It takes a little getting used to but it works extremely well. Aparently it can't do pivot tables and has problems with working with Excel templates that contain macros, and I've yet to figure out how to insert images into the header/footer - but otherwise it does everything and it's free! Tony (the dev) always responds quickly to any problems too!

Dave

Generic BackgroundWorker - My latest article!
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Interface using C# with Microsoft access database

julyhaluna12-Oct-09 21:12

julyhaluna

12-Oct-09 21:12

hi everyone.

im new here and currently i need help in my final year school project.

I have to create log in GUI which i have to connect it to Microsoft Access, where the database is.

it's when a user wants to log in, the program will compare with the database and confirm whether or not the user is authorized.

not only that, i have to do searching,sorting, adding and deleting of users. and it must be connected with the database.

another thing, does any of you know what is the codes to connect one form to another form?

i will be really glad if any one of you able to help me with my school project.

thank you and hope to hear from any of you soon. Smile | :)

Re: Interface using C# with Microsoft access database

Calla12-Oct-09 21:32

Calla

12-Oct-09 21:32

So what are the problems you're experiencing?
* The database connection?
* Running the query for authorizing a user?
* Queries for searching, adding, sorting, deletion?

The question of how to pass data between Windows Forms keep coming up here every now and then and I'm sure you'll find the answer if you search CodeProject.

Good luck!

Re: Interface using C# with Microsoft access database

julyhaluna12-Oct-09 21:59

julyhaluna

12-Oct-09 21:59

the problems that im experiencing is the database connection. when i try to debug it, it cant debug. and the weird thing i do not have any error.

but when i debug, it show the vlAccessConnection.Open () and higlighted it in yellow and it said that it can't find the file when i have already copy the file in the debug file.

here's some of the codes.

vlAccessConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source= data.mdb" + DBFileName);

           vlAccessConnection.Open();

i have been trying for days. and im stuck at this part.
pls help me. thank you. (:

Re: Interface using C# with Microsoft access database

Calla12-Oct-09 22:18

Calla

12-Oct-09 22:18

I think your connection string looks a bit weird. You set Source= data.mdb and then you append some variable called DBFileName. What is the resulting path of that? Isn't data.mdb your database file? Based on the info you have provided this is probably what's causing the problem. Check your conn string again (maybe have a look at this link as well.

PDF Files

Pavan Navali12-Oct-09 19:02

Pavan Navali

12-Oct-09 19:02

Hi,

I have to develop a c# application, which is simulates a pdf viewer. Any suggestion is appreciated.

Thank you.

Re: PDF Files

Calla12-Oct-09 20:16

Calla

12-Oct-09 20:16

Try this[^] Smile | :)

Re: PDF Files

Pavan Navali9-Nov-09 20:07

Pavan Navali

9-Nov-09 20:07

hi,

that was a funny reply. anyways before posting question in this website, I do search google, when I don;t get articles that could serve my purpose then I post a question. $Shucks | :-\$

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