Mfc Cmetafile and resizing window erases all data

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i have made a software to draw lines by mouse(Lineto) it is a mfc program based on cview and a sdi but whenever i resize or minimize my window all the drawing in the window is erased
how can i stop it
may be some onpaint event to retain the drawing
plz help

Posted 2-Apr-11 0:03am

nbd09

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2 solutions

Solution 2

1.) you should never paint outside a paint message.
2.) you should store your data (bitmap or point-list).
3.) you should handle the erase and the paint messages.
4.) draw your lines (or whatelse) onpaint message.
5.) to paint into a bitmap is very simple but limited to the bitmap size themselves.
Good luck.

[edit]
6.) to update the window - call the InvalidateRect function.

Posted 2-Apr-11 1:18am

mbue

Updated 2-Apr-11 1:19am

v2

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Hans Dietrich · Accepted Answer · 2011-04-02T00:40:00

Solution 1

You need to do the drawing in the OnPaint() handler.

Posted 2-Apr-11 0:40am

Hans Dietrich

Comments

nbd09 2-Apr-11 6:49am

how can i do drawing on onpaint() handler
i do it on a mouse event like on mouse move event and mouse button down
and up

Hans Dietrich 2-Apr-11 7:05am

Don't you keep a list of the drawing objects? Simply repaint the list in OnPaint().

nbd09 2-Apr-11 7:22am

thank you i overlooked it

Sergey Alexandrovich Kryukov 4-Apr-11 23:18pm

My 5.
--SA