RichTextBox multithreading

[lizii]

At the moment i am trying to write into a richtextbox using the Rtf
call from another richtextbox.

However realising that richtextbox do not have multithreading - i know
i need to invoke this item and make it multithreaded safe. But i
cannot find a single good example of how to do this. The richtextbox
i am trying to update is on one form - the richtextbox which has the
information to update it with is on another. I understand that i need
to invoke the control which i am updating...but i am just a little
confused.


Can someone give a rough example or point me at a source which makes
this all clear?


Thanks folks!


Liz.

 

[Guest]

You haven't described how you are multithreading. If you have two forms in
your app, by default you don't have more than one thread.

 

[lizii]

Just discovered the reason why this is happening and maybe a better
explanation.


I have a class which creates my own personally designed messagebox and
sets up a few variables.

I have an application which can consist of 2-5 forms - which with
there own closing method which calls said messagebox class on closing
to pop up a box which asks the user to confirm closing.

however - this messagebox has another function - called displaylog -
which is used to display a richtextbox with a list of log messages.

also in that function is a reference to:

thisrichtextbox->Rtf = anotherform->Richtextbox->Rtf;

this then causes a problem - when you close all those forms together -
each form creates its own messagebox - it makes a call to that line.
This then causes threading problems with that line referring to
writing to anotherform's richtextbox.

simplest solution? Sort out my constructor and remove that botch job
- or place a criticalsection around that call or a hybrid of the two.