Re: Draw OpenGLScene without WM_PAINT

"Albe" <alberto_ressia@[EMAIL PROTECTED]
> schrieb im Newsbeitrag
news:53f0110b-6d35-4e32-9a57-8c7834c86e19@[EMAIL PROTECTED]
> Hi all,
> I'm writing a software that receive data to USB ****t and draw same
> graphics in same Windows TAB ( I'm using Visual Studio 2003 with
> MFC ).
> I have to draw the new scene only when the new data on USB ****t is
> available and this data changing is not very fast (400 Hz - 400 sample
> per second), on this I have an issue with the extra work to CPU, is
> always upper than 90% probably because the WM_PAINT is so fast and the
> software draws continuosly the same scene between two sample to USB
> ****t.

The problem with 90% CPU power and unneeded draws is that a bug in command
sequence.
Use one of these
- ValidateRect()
- DefWindowProc()
- [MFC] CWnd::OnPaint()

to stop WM_PAINT sending until new content.

Use InvalidateRect() to refresh area. Do not send manual WM_PAINT with
SendEvent() !!

>
> To solve this issue I tried to eliminate the WM_PAINT in OpenGL and
> call the OpenGL::OnPaint only when the new data occours but the
> window's device context is 0 and I don't understand why.
>
> Cau yuo help me?
>
> Thank you
>
> Alberto

Hope this helps.

Clemens