Forum

Hello.

It is a former question.

When I use System proportional font in large quantities.

Why will application become slow?

http://www.prof-uis.com/prof-uis/tech-support/support-forum/when-i-add-300-dialog-to-cexttabpagecontainerflatwnd-63049.aspx

>If you allocate 10000 GDI handles, Windows will start using the "System" proportional font everywhere. So, you should not allocated 10000 GDI handles.

>Approximately the same we can say about allocating 300 tab pages. Besides, keeping 300 items in the single line tab control is not a a user friendly design.

>This design should be replaced with something else. For instance, you can use a list box inside tab control and created only one page window which corresponds to the selected list box item.

Hello.

I examine problems of the GDI.

By using a lot of handles.

Because the OS transmits Windows message to the handle.

Will application become slow?

The lesser GDI / HWND handles, the faster the app. 300 dialog pages in a tab page container is not good. It’s really not good. You need to use an approach like this:

http://www.prof-uis.com/download/forums/TestDynamicTabPageContainer.zip

Thank you for an answer

Please answer it

Sorry for this delay. The type of the font is not important. It can use be variable or fixed width characters. The counts of GDI and other handles is the critical question. Prof-UIS minimizes the count of GDI handles. It caches only a few font and brush GDI handles. Bitmap handles are mostly never allocated because the CExtBitmap class is handle-less. Did you check the count of handles allocated by your application at run-time?