Re: When should i use ?? Timer vs Thread.Sleep(int); - C# Discussion Boards

Re: When should i use ?? Timer vs Thread.Sleep(int);

6-Aug-07 2:18

Hi,

it is slightly more complex:
- you can use timers to get a single activation in future, or a periodic activation;

- the timer fires its event on some thread; for a Windows.Forms.Timer that would be
the main or GUI thread; for other timers, it is a different thread (which is good since
it does not load the GUI thread, but it also makes you need Control.InvokeRequired
and Controle.Invoke() if the timer's handler needs to touch some Control).

- you can use Thread.Sleep() to put the current thread to sleep for some time, but only
if that is acceptable to the thread. It is probably OK to do it in a worker thread
or background thread, and not in the main thread (aka "GUI thread") since during the
sleep the entire GUI comes to a halt, so it would not repaint when uncovered, you would
not be able to resize it, etc etc.

So, if you have things to do on the GUi thread thar must be kept apart in time, you
have to organize that without Trhead.Sleep(); in that case a Windows.Forms.Timer is
the right choice.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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Pete O'Hanlon6-Aug-07 3:21

Re: When should i use ?? Timer vs Thread.Sleep(int);

6-Aug-07 3:21

Not fair. I wanted to answer this one;P. Good answer though.

Deja View - the feeling that you've seen this post before.

Malcolm Smart6-Aug-07 3:27

Malcolm Smart

6-Aug-07 3:27

You answered like this because it seems you have no idea about the subject. Laugh | :laugh:

"More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF

Re: When should i use ?? Timer vs Thread.Sleep(int);

Pete O'Hanlon6-Aug-07 3:34

Re: When should i use ?? Timer vs Thread.Sleep(int);

6-Aug-07 3:34

Yup - that's me. I'm the ultimate expert. I know nothing about everything. Laugh | :laugh:

Deja View - the feeling that you've seen this post before.

Luc Pattyn6-Aug-07 3:54

Re: When should i use ?? Timer vs Thread.Sleep(int);

6-Aug-07 3:54

Pete O`Hanlon wrote:
I know nothing about everything

Then why is it I have seen questions you did not answer ?

Luc Pattyn [Forum Guidelines] [My Articles]

Pete O'Hanlon6-Aug-07 4:01

TreeView StateImageList StateImageIndex

6-Aug-07 4:01

I like to spread my ignorance thinly.

Deja View - the feeling that you've seen this post before.

Abisodun6-Aug-07 2:00

Abisodun

6-Aug-07 2:00

Is there a max value for treeNode.StateImageIndex?

I have a stateImageList with 21 images. Any image above the 15th e.g. treeNode.StateImageIndex = 15, generates an ArgumentOutOfRangeException with message:

InvalidArgument=Value of '15' is not valid for 'StateImageIndex'

A max value isn't documented as far as I see. What am I missing?

Thanks

Re: TreeView StateImageList StateImageIndex

Abisodun6-Aug-07 3:41

Abisodun

6-Aug-07 3:41

I see this behavior is documented for 3.0 but not in 2.0.

http://msdn2.microsoft.com/en-us/library/system.windows.forms.treenode.stateimageindex.aspx[^]

ArgumentOutOfRangeException - The specified index is less than -1 or greater than 14.

Fair enough.

Automatical start up

Albu Marius6-Aug-07 1:18

Albu Marius

6-Aug-07 1:18

I have an application that I want to start as soon as the user enters Windows. How can I configure this from the installation? Could anyone give me a link or some advice? Smile | :)

I am fighting against the Universe...
Reference-Rick Cook

Pete O'Hanlon6-Aug-07 1:33

6-Aug-07 1:33

Make it a service. Get it put into the special Startup folder. Take your pick.

Deja View - the feeling that you've seen this post before.

Albu Marius6-Aug-07 1:36

Albu Marius

6-Aug-07 1:36

Thanks. I'll go with the special folder part. Big Grin | :-D

I am fighting against the Universe...
Reference-Rick Cook

http://www.bleepingcomputer.com/tutorials/tutorial44.html

Hessam Jalali6-Aug-07 1:37

Hessam Jalali

6-Aug-07 1:37

Nouman Bhatti6-Aug-07 1:54

Nouman Bhatti

6-Aug-07 1:54

In setup project -> file system Editor
add the user's startup project and add your exe their.

or visit this link

http://www.developerfusion.co.uk/forums/thread/97759/

Vasudevan Deepak Kumar6-Aug-07 1:57

Vasudevan Deepak Kumar

6-Aug-07 1:57

There are a lot of ways.

1) Windows Service (works even if no one is logged on)
2) Startup Folder of Users/All Users

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Detecting Key Presses

JamesBarnes6-Aug-07 1:13

JamesBarnes

6-Aug-07 1:13

Using the KeyDown event, i can see if a key has been pressed while the form is in focus, but how do i check what key was pressed?

Thanks in advance Smile | :)

Luc Pattyn6-Aug-07 1:24

6-Aug-07 1:24

In general, events provide the information you need. That is what makes them useful.

Have you noticed the two arguments your KeyDown handler is getting ?
There even is some documentation explaining KeyEventArgs if you would care to read it.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

JamesBarnes6-Aug-07 1:29

JamesBarnes

6-Aug-07 1:29

In the end i figured out i could do this...

if (e.KeyCode == Keys.K)<br />
            { MessageBox.Show("Key was k"); }

Is that a poor way of doing it?

Also, perhaps you could explain the mystery e, ive used it in GDI+ too, but dont know what it is Smile | :)

JamesBarnes6-Aug-07 1:31

JamesBarnes

6-Aug-07 1:31

Just after posting that, i looked and it hit me, that was a dumb question =)

thanks for the help ^^

Luc Pattyn6-Aug-07 1:52

6-Aug-07 1:52

You're welcome.

You may want to right-click on something and select "Go to definition", chances are
Visual Studio helps you in understanding what it is then (it does not work all the time).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]