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devel / comp.os.ms-windows.programmer.win32 / Re: EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values - found, but not solved.

EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values

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From: address@not.available (R.Wieser)
Newsgroups: comp.os.ms-windows.programmer.win32
Subject: EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values
Date: Fri, 8 Apr 2022 12:44:31 +0200
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by: R.Wieser - Fri, 8 Apr 2022 10:44 UTC

Hello all,

I'm trying to use EM_GETSCROLLPOS and EM_SETSCROLLPOS to save and later load
a position in a RichText control.

The problem is that when I set a certain position and *directly after*
retrieve the position they differ quite a bit (at least 10000 smaller
vertical).

I have no idea why that that happens, and neither MSDN doc to both tells me
about it either. :-|

So, my question : Does anyone here knows whats going on here ?

On a hunch I just tried to set several vertical positions in the range of
10000 to 60000, and dividing the results by those numbers returned a steady
0.78. IOW, its not the (constant) hight of the control's window or
something like that.

Regards,
Rudy Wieser

Re: EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values - found, but not solved.

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Newsgroups: comp.os.ms-windows.programmer.win32
Subject: Re: EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values - found, but not solved.
Date: Tue, 12 Apr 2022 17:31:17 +0200
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by: R.Wieser - Tue, 12 Apr 2022 15:31 UTC

> So, my question : Does anyone here knows whats going on here ?

Having written some basic stuff to use a RichEd30 control and following a
hunch I think I know what happens : simply using any font other than the one
the control is created with causes the mismatching.

And that makes the (above mentioned) messages all but worthless for RTF
files, and /almost/, but not totally, for plain text files. :-(

Funny though : MSDN doesn't mention it and neither does a quite a bit of
googeling and ddg-ing.

Regards,
Rudy Wieser

Subject	Author
EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values	R.Wieser
Re: EM_GETSCROLLPOS result != EM_SETSCROLLPOS set values - found, but not solved	R.Wieser