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Painting/Drawing problems

Posted on 1998-03-23
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Last Modified: 2013-11-19
I don't really know the difference between what WM_PAINT does and what WM_DRAW does, and this is
causing some trouble. I have an application with a CEditView and I have a string of text that I am trying to
print to it. I would like the screen to be cleared before I print a new string. I tried to do this by using
GetEditCtrl().SetWindowText (NULL), but the text disappears immediately after printing. I  am using GetEditCtrl().SetSel and ReplaceSel to print the text. I think this has something to do with the window painting,
 but i don't know how to stop this.

I think this probably has an easy answer. If it turns out not to, I will offer more points.
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Question by:horn
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mikeblas earned 200 total points
ID: 1317162
It's a very easy answer: the difference between WM_PAINT and WM_DRAW is that WM_PAINT exists while there's no such thing as WM_DRAW.

Calling SetWindowText(NULL) will clear the window of all text.  If you want to erase all of what's in the control, just call SetWindowText() with the text you want to place in the control. The text you place in there will erase what used to be there.

If you use SetSel() and ReplaceSel(), you can have more control over what happens to the text that's already in the control--you can add to the beginning or add to the end, for example.

.B ekiM
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Author Comment

by:horn
ID: 1317163
OK, I didn't know about the non-existence of WM_DRAW. No wonder I couldn't find it
anywhere in the docs. FYI I *have* tried reading the online documentation -- but a lot of
it is non-intuitive, and pretty disorganized. I guess I should go buy Petzold or something.

Thanks.
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LVL 11

Expert Comment

by:mikeblas
ID: 1317164
If you use the very fine full-text search commands and turn up nothing, you can be certain it doesn't exist.

.B ekiM

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