Hello all,
Wonder what approach is used for this problem.
I have a MDIApplication, the MDIClinets are to be in a seperate thread.
So I've done something like this,
// Create a new Show method that starts a new thread
public new void Show()
{
Thread t = new Thread(new ThreadStart(Thr eadProc));
t.Start();
}
public void ThreadProc()
{
base.Show();
}
Now my problem is that I basically don't have a run loop, so as soon as the
Form shows the thread exits and I'm pretty much left in the soup.
I'm sure other people have done this in .NET?
Any ideas suggestions etc?
Thanks for you time
Brian Keating.
Nov 16 '05
12  5853 
"Brian Keating EI9FXB" <csharp at briankeating.ne t> wrote in message
news:BF******** *************** ***********@mic rosoft.com... Ok guys, thanks for your help,
I wonder if anyone has a suggestion on another approach.
Let me explain my problem, I've services running on my system, my
application receives diagnostic messages from these services, what i want
to
do is create an MDIChild window for each service that sends a message.
Ok so far so good, but I get problems if one service is constantly
sending
messages to it's window because, this window is very busy updating it's
view,
hence because it's in the same thread at all other MDIChild windows and
the
MDIParent window the whole application is un responsive becasue this
window
is too busy.
I did manage to get the Multithread MDI working and stable in a C++
ATL/WTL
application but it proved a heartache to say the least. I'd rather not go
down that road again.
You should be able to handle this situation gracefully if you decouple the
window's UI operations (i.e., repaint) completely from the processing of
diagnostics messages. In other words, have the diagnostics message receiver
thread place the information into your own queue (or list, doesn't matter),
and then call Invalidate for the window (via Control.Invoke or BeginInvoke
to make it thread-safe).
If you really get lots of diagnostics messages and calling Invalidate is
still not good enough, then consider not calling Invalidate every time a
diagnostics message arrives. Simply place the diagnostics information into
your own queue and have the UI thread check the state of the queue e.g.,
once per second on a timer. This way you will get a refresh at a comfortably
slow rate no matter how fast the diagnostics messages arrive.
I'd go creating forms in multiple threads only as the very last resort.
Regards,
Sami
Hi Alex,
I've a test app created that used the Application.Run as you suggest,
this is pretty close to what I want, however i do get some events twice etc,
but I hope i'm getting close.
thanks for your help.
regards
Brian.
"AlexS" wrote: If you use MDI you have limit of one thread, which is UI distributing
messages between child windows. I would go away from this paradigm.
You might be better off if you create forms on threads and use
Application.Run for these forms. This seems to create separate message pumps
and keeps windows pretty responsive if painting code is Ok. The only
drawback I've seen so far is that you have to manage separate threads /
forms as one applications - it adds some unnecessary complexity,
I am not sure why you want to have MDIChild for each service in one
application. Service is separate process, so related standalone form seems
to be natural companion.
HTH
Alex
"Brian Keating EI9FXB" <csharp at briankeating.ne t> wrote in message
news:BF******** *************** ***********@mic rosoft.com... Ok guys, thanks for your help,
I wonder if anyone has a suggestion on another approach.
Let me explain my problem, I've services running on my system, my
application receives diagnostic messages from these services, what i want
to do is create an MDIChild window for each service that sends a message.
Ok so far so good, but I get problems if one service is constantly
sending messages to it's window because, this window is very busy updating it's
view, hence because it's in the same thread at all other MDIChild windows and
the MDIParent window the whole application is un responsive becasue this
window is too busy.
I did manage to get the Multithread MDI working and stable in a C++
ATL/WTL application but it proved a heartache to say the least. I'd rather not go
down that road again.
Suggestions welcome.
Thanks in advance
Brian.
"Tom Shelton" wrote:
On 2004-11-25, Nigel Armstrong <Ni************ @discussions.mi crosoft.com> wrote: > Hi Tom
>
> How does this work with the "Thou Shalt have one User Interface thread per > application" rule - do we get a separate message pump for each MDI Child > window with this approach?
>
> Just interested really...
>
> Nigel Armstrong
Ooops! I missed the MDI part. No can do. This would cause definate
issues. I think you'll need to change your design...
As for top level windows, yes, you get a message pump per thread.
--
Tom Shelton [MVP]
Hi Sami,
Tnx for your help, I'm still doing up a few tests so when I finally get a
"workable" solution I'll post an article on it.
thanks for your time.
Brian
"Sami Vaaraniemi" wrote:
"Brian Keating EI9FXB" <csharp at briankeating.ne t> wrote in message
news:BF******** *************** ***********@mic rosoft.com... Ok guys, thanks for your help,
I wonder if anyone has a suggestion on another approach.
Let me explain my problem, I've services running on my system, my
application receives diagnostic messages from these services, what i want
to
do is create an MDIChild window for each service that sends a message.
Ok so far so good, but I get problems if one service is constantly
sending
messages to it's window because, this window is very busy updating it's
view,
hence because it's in the same thread at all other MDIChild windows and
the
MDIParent window the whole application is un responsive becasue this
window
is too busy.
I did manage to get the Multithread MDI working and stable in a C++
ATL/WTL
application but it proved a heartache to say the least. I'd rather not go
down that road again.
You should be able to handle this situation gracefully if you decouple the
window's UI operations (i.e., repaint) completely from the processing of
diagnostics messages. In other words, have the diagnostics message receiver
thread place the information into your own queue (or list, doesn't matter),
and then call Invalidate for the window (via Control.Invoke or BeginInvoke
to make it thread-safe).
If you really get lots of diagnostics messages and calling Invalidate is
still not good enough, then consider not calling Invalidate every time a
diagnostics message arrives. Simply place the diagnostics information into
your own queue and have the UI thread check the state of the queue e.g.,
once per second on a timer. This way you will get a refresh at a comfortably
slow rate no matter how fast the diagnostics messages arrive.
I'd go creating forms in multiple threads only as the very last resort.
Regards,
Sami
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