On 26/03/15 22:14, Phil Davis wrote:
Hi Richmond,
If the scanner is an HID device, you won't get very far. You would
probably need a driver to communicate with, via "open driver" etc. And
even then you would have to have info about the driver's data formats.
Am I being naive? or if one uses "open driver to write" can one then
write API commands to that driver?
I tend to see USB as a large black hole. I haven't looked at it since
USB 2.0, but at that time the spec was daunting. It seems to have
multiplied since then: http://www.usb.org/developers/docs/
Do you have a flash drive (aka thumb drive)? That's a USB mass storage
device. You can read from/write to that. (Of course)
Just some thoughts off the top of my head -
Phil Davis
On 3/26/15 1:04 PM, Richmond wrote:
While I am waiting for my turtle to be delivered I am getting pretty
cheesed-off as I would like a USB device I could hook up to my various
computers running various operating systems . . .
Certainly I feel it is pretty pointless working on "open to read" and
"open to write"
stuff if I don't have a target USB device to practise with.
I have plenty of USB devices, but most of them are what I call
"one-way" devices:
that is to say they sent data to the computer, but no data is ever
sent the other way.
Anyway, I have just spotted a fairly old USB scanner (well, bought it
about 15-16 years ago)
lurking under a desk, and that is a "two-way" device as it has to be
controlled from an interface on
the computer . . .
However, while I can, quite possibly, do an "open to read", I am
going to find it difficult to "read"
anything until I "write" some sort of command to the scanner to scan
something . . .
Has anybody tried controlling a scanner from LIvecode?
Has anybody any idea of the sort of commands I should be sending a
scanner?
Richmond.
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