CProgressBar and threads

I'd like to popup a window with a CProgressBar bar when
doing a series of actions. I know I need to use threads
for this. I know the concept of threads, but not at all
how you do anything with threads in MFC. Can anyone help?

Thanks,
Joachim

Anand
Tue Aug 19 08:16:00 CDT 2003

Hi Joachim,

There are two kind of threads in MFC, Worker Thread and
User interface theread. Worker thread will run in
background and you do not have to wait for it to continue.
There is no MSG queue in worker thread. User Interface
thread provides a message queue and useful in interactive
user interface.

You can create worker thread using AfxBeginThread() and
pass controlling function as first parameter.

For user interface thread you can use same AfxBeginThread
() function. But in this case pass first parameter as
Runtime class object. RUNTIME class is class derived from
CWinThread. Alternative to this method is to use
CreateThread() method. In previous case AfxBeginThread
will call CreateThread() internally.

So now in your application create a worker thread for
background processing and then start procesing. It you
have UserInteface, you have User interface thread running
so display your progress bar using that thread.

I'd suggest you to read Threading document of MFC on MSDN
web site / CD. Chekc the CWinThread class help, there
you'd get lot more details regarding threading in MFC.

Enjoy...
Anand Raval
(remove 1 for email)


>-----Original Message-----
>I'd like to popup a window with a CProgressBar bar when
>doing a series of actions. I know I need to use threads
>for this. I know the concept of threads, but not at all
>how you do anything with threads in MFC. Can anyone help?
>
>Thanks,
>Joachim
>.
>

Joachim
Tue Aug 19 10:23:09 CDT 2003

Thanks Anand,

However, I encountered problems when trying to do the user
interface thread: The user interface is a dialog (inherits
from CDialog) and have to inherit from CWinThread
(according to MSDN). When compiling this I get the
following error when trying to create a new object of my
class:

error C2385: 'CMyClass:new' is ambiguous

Why this error and how do I solve it?

Thanks,
Joachim

>-----Original Message-----
>Hi Joachim,
>
>There are two kind of threads in MFC, Worker Thread and
>User interface theread. Worker thread will run in
>background and you do not have to wait for it to
continue.
>There is no MSG queue in worker thread. User Interface
>thread provides a message queue and useful in interactive
>user interface.
>
>You can create worker thread using AfxBeginThread() and
>pass controlling function as first parameter.
>
>For user interface thread you can use same AfxBeginThread
>() function. But in this case pass first parameter as
>Runtime class object. RUNTIME class is class derived from
>CWinThread. Alternative to this method is to use
>CreateThread() method. In previous case AfxBeginThread
>will call CreateThread() internally.
>
>So now in your application create a worker thread for
>background processing and then start procesing. It you
>have UserInteface, you have User interface thread running
>so display your progress bar using that thread.
>
>I'd suggest you to read Threading document of MFC on MSDN
>web site / CD. Chekc the CWinThread class help, there
>you'd get lot more details regarding threading in MFC.
>
>Enjoy...
> Anand Raval
> (remove 1 for email)
>
>
>>-----Original Message-----
>>I'd like to popup a window with a CProgressBar bar when
>>doing a series of actions. I know I need to use threads
>>for this. I know the concept of threads, but not at all
>>how you do anything with threads in MFC. Can anyone help?
>>
>>Thanks,
>>Joachim
>>.
>>
>.
>