From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joost Kremers <joostkremers@fastmail.fm>
Subject: Re: Placement of \makeatletter with \beamer@frametextheight
Date: Thu, 29 Nov 2018 14:41:20 +0100
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Cc: Loris Bennett <loris.bennett@fu-berlin.de>


On Thu, Nov 29 2018, Gustavo Barros wrote:
> Louis,
>
> a hunch, which might work.
> It seems that, if you try to set the length in your preamble,
> `\beamer@frametextheight` is not yet defined.
> So, you might try the hook `\AtBeginDocument` to see if the 
> definition comes at
> a better timing.
>
>  #+LATEX_HEADER:
> \newlength\mytextheight\AtBeginDocument{\makeatletter\setlength\mytextheight{\beamer@frametextheight}\makeatother}
>
> As I said, it's a hunch, for I haven't tested. But I think it 
> may be it.

Why not put the entire thing inside \AtBeginDocument?

To the OP: \paperheight does seem to be available in Beamer. 
Couldn't you use that?

-- 
Joost Kremers
Life has its moments