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Re: [Qemu-devel] Qemu on Windows: Redirect output to console

From: Peter Laursen
Subject: Re: [Qemu-devel] Qemu on Windows: Redirect output to console
Date: Mon, 25 Jun 2007 17:44:36 +0000

Hi everyone,

Thanks for your replies, they have been of great help. I still haven√łt 
solved the basic problem of redirecting the output to a console, mostly 
because -nographic does not work on Windows ports of Qemu...

There already are Linux operating systems that ship with screen readers 
that read the graphic desktops built in, so I would only want to run 
text-based operating systems (FreeBSD, for example - I've heard that is 
almost pure command line and I'd like to check it out if possible. I 
know tha Debian is)

Sadly, I couldn't get the -serial option to work either - here's the 
command line that I used to start qemu with:

qemu.exe -L . -m 128 -hda linux.img -soundhw all -localtime -M isapc -
serial tcp:,server -nographic

that should, in theory, allow me to get the output into a telnet client?

I hadn't thought about piping Festival on a Windows box - but I'd like 
to see if I can get this to work first before I try that.

Any other suggestions or anything else I could try?

I look forward to hearing from you and thank you very much for your 

Best regards,


> Hi Peter,
> there already exists a QEMU command line option -nographic which
> disables graphical output and redirects the first serial port
> of the emulated machine to the console.
> With QEMU running Linux in text mode, this works fine - you will
> "see" the boot messages and can run a shell or any text application
> from the console, so it should be possible to analyse this output
> with a screen reader.
> QEMU can also redirect any serial port to pipes, so some
> speech synthesizer like "festival" could be connected directly.
> This URL describes the command line options -serial and -nographic:
> http://fabrice.bellard.free.fr/qemu/qemu-doc.html#TOC10
> I have no idea how you can access graphical interfaces like MS 
> Stefan
> Peter Laursen schrieb:
> > Hi everyone,
> >
> > I have downloaded the 0.9.0 version of the Qemu source code and 
> > to compile it using MinGW and MSYS. But I face a problem with the
> > compiled binary.
> >
> > I am blind and therefore need to redirect the output from the guest 
> > to a standard Windows console or a software speech synthesizer so 
> > a screen reader will be able to read the output produced. What
> > functions will I eventually need to modify? A text console would of
> > course be preferred.
> > My main reason for hoping to getting this to work is to allow blind
> > people to experiment safely with other operating systems - it would
> > also minimize the learning curve.
> >
> > I hope that you will be able to point me in the right directions as 
> > which source files and functions I would need to change. I have
> > searched through the source files and googled for documentation for 
> > source code, but I didn't find any. I also searched to see if there
> > were any patches that might accomplish the work - I was unable to 
> > any.
> >
> > I look forward to hearing from you.
> >
> > Peter.


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