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Access to text-mode screen captures... as text

PostPosted: 18. Jun 2019, 11:02
by bifferos
Using VBoxManage I can get a capture of the screen, but I want to do some OS install automation without the benefit of the guest additions (wait for a screen, press a key, etc...). I wondered if there's a trick to getting the text-mode text from the screen before VirtualBox renders it into the frame buffer so I don't have to do OCR on the captured images.

I'm prepared to recompile VB to get this information out, I wondered if anyone knows how difficult it would be?

Thanks!

Re: Access to text-mode screen captures... as text

PostPosted: 18. Jun 2019, 11:47
by mpack
The only place text is available is inside the app which generates it. VirtualBox has no knowledge of what pixels on a graphics display mean in the collective. And even if you're correct that you are using an actual text mode, and not graphics mode displaying a text font, it certainly isn't a stream: there is no requirement for the display to be updated in linear order.

So, no. I'm afraid not.