C# Discussion Boards - CodeProject

Re: AllocConsole and Console

28-Jun-07 6:26

CiNN wrote:
I am using AllocConsole to add a console window to a window form at runtime

Why?

CiNN28-Jun-07 6:31

CiNN

28-Jun-07 6:31

why not

icon

HexaDeveloper28-Jun-07 5:55

HexaDeveloper

28-Jun-07 5:55

hi all

i save a file in my program in an extension that i made
so i wanna this file to have the icon of my program how can i make it

thanx

Generator

Re: icon

Luc Pattyn28-Jun-07 6:05

Luc Pattyn

28-Jun-07 6:05

You can do it manually in many ways:
- through Windows Explorer, Tools, Folder Options, File Types;
- more easily: by double-clicking a file with the new extension; Windows will guide
you through the process.

And you can do it programmatically, it has been described in many CP articles;
search for "File Association".

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: icon

Giorgi Dalakishvili28-Jun-07 6:14

Giorgi Dalakishvili

28-Jun-07 6:14

Have a look at this: http://msdn2.microsoft.com/en-us/library/ms951285.aspx[^]

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Throughput/Design Problem

tobriain28-Jun-07 5:05

28-Jun-07 5:05

Hello,

I hope one of you have found a solution to the following problem before. . . Thanks in advance if you have.

I have to implement an interface defined in an external program - I must have a method Notify() in my object

toimplement that interface. When there's an update, the Notify() method is called by the external program. I can

then collect any updates with a method call that returns a System.Array consisting of an ID (given by me when

implementing the connection), and a value.

The problem is that the array that I collect updates from is of fixed size (subsequent updates are not added to

the end of the array like a queue. . ), so sometimes by the time I've collected the update, set a member variable

in another object to the value (m_Object.SomeValue) and returned to respond to any subsequent Notify() calls, the

updates have been overwritten and I've missed some updates. . . Not great. I've removed any calculations I was

doing in these Set() methods, but it still doesn't return in time. .

This is a sample of my set-up:

ManualResetEvent m_NotifyEvent;
Thread m_UpdateThread;
. . . .
m_NotifyEVent = new ManualResetEvent(false);
m_UpdateTHread = new THread(new ThreadStart(RTDUpdates));
m_UpdateThread.Start();
... . .. .

private void RTDUpdates()
{
m_NotifyEVent.WaitONe();

System.Array arrValues = m_RTDServer.RefreshData();
if(arrValues > 0)
{
for (int i =0; i

Pete O'Hanlon28-Jun-07 5:11

Pete O'Hanlon

28-Jun-07 5:11

You could always store it in a List<...> or ArrayList internally and then just copy it out to an array to return it out.

Please visit http://www.readytogiveup.com/ and do something special today.
Deja View - the feeling that you've seen this post before.

led mike28-Jun-07 5:14

28-Jun-07 5:14

tobriain wrote:
How can I concentrate on maintaining the proper state of the variables

You mean like making a copy of the Array as your first step? D'Oh! | :doh:

tobriain28-Jun-07 5:37

28-Jun-07 5:37

Thanks for the swift replies. .

>You mean like making a copy of the Array as your first step?

In any case, processing the updated array, setting the values and returning in time doesn't seem to be working. If I make a copy of the array and return immediately, i'll end up having maybe 10 arrays per second. I need to get the values out of the update array on one thread, maybe, and put them into some kind of dynamic list. Then on another thread, I need to take the values out in order, and set the variables. If that works, although the variables will be set a little bit later than before, they will be set in order, with none of the updates being dropped. How do I go about doing that?

Best regards,

Tom.

led mike28-Jun-07 6:25

28-Jun-07 6:25

tobriain wrote:
How do I go about doing that?

I don't know what you are asking? You have still not supplied a complete description of your Problem/Goal. Surely putting values into member variables is not the end goal of your processing.

tobriain28-Jun-07 6:41

28-Jun-07 6:41

Thanks again for the help.

It's not the end goal, no. I set variables, do some processing and comparisons based on the updates, fir events, update a GUI, save a log etc. Everything after that is working perfectly. Once the variables are set with the updates, my application works as expected. The only problem is that I'm dropping updates. I'm collecting a value from an 'intray' in an external program - an intray that only has space to store one update. I need a thread that does nothing but collect updates, throw them onto a queue and return immediately.

Then I need to nofify a method that updates are on the queue, and get it to remove the updates in order, set variables accordingly and clear the queue. The problem is that I need to do that without 'locking the queue', because then my other thread will not return to collecting data from the external program in time. . . . Any ideas?

Best regards,

Tom.

pbraun28-Jun-07 11:26

pbraun

28-Jun-07 11:26

Sounds to me like you have a good handle on what you need to do, but are not certain about the details.

What I perceive that you need is this:

1. You need to declare a class available AutoResetEvent.
2. You need to declare a dynamic list of some sort. In this case Queue would work perfectly.
3. You need to set up a thread that runs when this thread becomes signaled.
4. In your notify event handler do two things,
A. Put the incoming data block/message onto the queue.
B. Signal the autoresetevent that there is data to process.

In your data processing thread, make sure that it runs until all items on the queue are processed before returning to wait for the next signal.

As for locking, use a synchronized queue. That way the locking is done for you. If you're worried that locking the queue will cause the notification method to take too long, then you are not using locks properly. You should only lock the queue when you are adding to it or removing from it. Otherwise there should be no need to lock.

Uhm, yeah I spent 6 years dealing with a very similar situation.

Hopefully this helps.

Phil

tobriain28-Jun-07 11:34

28-Jun-07 11:34

Fantastic. Nose to the grindstone now. .

tobriain2-Jul-07 9:36

2-Jul-07 9:36

Phil, I've just one question about your suggestion, and would appreciate you help as you've obviously spent time putting together something robust along the same lines.

At the moment, if I create multiple RTDServers, all the different calls to UpdateNotify() will be on the same thread. Is that correct? Should I thread them out, so that the initial calls can be made on separate threads?

Could I just create a delegate with the same signature as my RTDUpdates method and make a call to BeginInvoke in the UpdateNotify method to queue all the updates on the ThreadPool? (It doesn't matter if the updates are not processed in order). If I do something like that, do I need a dummy EndInvoke to close the AsyncWaitHandle?

When UpdateNotify is called, could I make a call to to a new method (one that calls the RefreshData method) with BeginInvoke, and then set up the RTDUpdates method as the callback method?

I'd appreciate any pointers you could give me on this, as I'm sure some of the above are illadvised for various reasons.

Best regards,

Tom.

pbraun3-Jul-07 5:48

pbraun

3-Jul-07 5:48

I'm not certain I understand the design of your software system. Please give more specific details such as: Are there one or more executables creating the data that is to be displayed? Are there one or more executables reading and displaying this data? Is there any other processing besides getting the data ready for display?

When updating the UI from a separate thread, one should always use the delegate and begin invoke calls in the UI method for the reason that the UI processing will be done on the UI thread. You don't need to worry about calling the end invoke method, that method is called by the UI thread when it is finished and the clean up will ensue.

As for how to setup the delegates for the UI properly, you can read up on that in your help documentation. Look up the key word "delegates".

Phil

tobriain28-Jun-07 6:43

28-Jun-07 6:43

led mike wrote:
I don't know what you are asking? You have still not supplied a complete description of your Problem/Goal. Surely putting values into member variables is not the end goal of your processing.

led mike28-Jun-07 7:00