Re: [libreoffice-users] Reading from a USB device.

Hi anne-ology,

I think my subject line was misleading.  My USB device is a musical
keyboard rather than an external HD.

I inherited the keyboard from my step son.  It happened to be a MIDI
keyboard.  This turned out to be just what I needed, as it tells me exactly
the note number that has been pressed, (or released), plus any movement in
the nine sliders.  I have set up the sliders to correspond to the draw bars
on a Hammond Organ.  (The draw bars determine which harmonics are used to
modify the sound produced.  A very large number of variations are
possible.)  So armed with the MIDI information, I hope to write a program
that can simulate a Hammond Organ.  Possibly a pipe dream, but time will
tell.

But to get started I need to be able to read the MIDI stream, which at the
moment is coming through a USB port.  Hence my request for any info on code
that might help help me to do that.

Thanks for your reply,

Noel
--
Noel Lodge
lodgemn@gmail.com

On 28 August 2017 at 08:25, anne-ology <laginnis@gmail.com> wrote:

>        If your external HD has LO, then there shouldn't be a problem.
>
>        Question: is there some reason you're using .midi rather than
> another sound application?;
>           .midi programs are outdated, since they supposedly don't have
> the actual sound, rather merely text.
>
>        Hoping this helps, and you're able to accomplish whatever you're
> planning,
>
>
>
>
> From: Marion & Noel Lodge <lodgemn@gmail.com>
> Date: Sun, Aug 27, 2017 at 8:47 AM
> Subject: [libreoffice-users] Reading from a USB device.
> To: "users@global.libreoffice.org" <users@global.libreoffice.org>
>
>
>
> I have a Studio Logic MIDI music keyboard which I have plugged into my PC
> via a USB cable.  Windows has automatically installed the appropriate
> driver/s.  I am attempting to read the MIDI input from the keyboard as I
> want to see if I can use a Macro to modify the sound before it goes to the
> speaker.   (Actually I want to try to programmatically mix sine waves like
> a Hammond Organ does - it may not be possible, but I'd like to give it a
> try!)
>
> I installed a trial version of Device Monitoring Studio,   see
> https://www.hhdsoftware.com/device-monitoring-studio    which enables me
> to
> trap the raw data from the keyboard, and I'm able to identify which keys
> are pressed or released, and also the keyboard sliders' movements and
> slider positions.  For my purposes, that is all I need to extract from the
> MIDI stream.
>
> I then went on the Web to see if I could find examples of Macro code that
> would enable my program to emulate what I had been able to do with Device
> Monitoring Studio.  It turns out that USB coding is very complex and the
> only examples I could find were in C, C++ or Visual Basic, none of which I
> have, or have ever worked with.
>
> I then had a look at LibreOffice 5.3 SDK API.  I believe that is the API
> that Base uses, and over several years I have developed a number of
> databases using macros that make calls to the API. One API service I found
> was,  com.sun.star.io.pipe,  which looks as though it might be what I need,
> but I don't know if it would work with a USB port, and I could not find any
> macro code examples that might point me in the right direction.
>
> So my questions are -
> 1.  Does anyone know if it is possible to read from a USB port using a
> LibreOffice macro utilising the API?  If so can you point me to some
> example code (preferably in Basic)?
> 2.  Failing that, is there a simple application on the market that can read
> a USB MIDI stream into a buffer or file?  I think Device Monitoring Studio
> can do that, but it is expensive and has far more features than I'll ever
> need.
>
> Any help in this regard would be much appreciated
>
> Thanks,
>
> Noel
> --
> Noel Lodge
> lodgemn@gmail.com

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