Re: Talking to USB
From: Don (phoney.email_at_yahoo.com)
Date: 11/28/04
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Date: Sun, 28 Nov 2004 13:42:00 GMT
Hi Roland,
I do have the SDK but it's provided on "as is" basis. However, the SDK
does *not* address the actual USB communications! In other words, I
know all the low level commands and what to expect back.
The missing piece is how do I send these commands down the USB pipe?
In theory, that should be the most elementary bit but it's turning out
to be a veritable nightmare.
Don.
On Sun, 28 Nov 2004 13:05:43 +0100, "roland"
<roland.demeester@skynet.be> wrote:
>Don
>Have you "contacted" the supplier of the driver (not the device, I found out
>that a lot of hardware vendors are not developing their own driver, but are
>buying it from a company developing drivers)? What you need (I assume, don't
>take it for granted!) is the documentation and library to help you
>communicating with the API's of your driver. I think the only standardized
>protocol is the lowest level communication protocol over the USB bus, but it
>doesn't go much further than that I'm afraid.
>Roland
>
>"Don" <phoney.email@yahoo.com> wrote in message
>news:41a88c32.11305000@news.individual.net...
>> Hi Roland,
>>
>> In my case it's a scanner but I can't use TWAIN because it's too high
>> level. I have a list of low level commands which I wish to send to the
>> scanner directly because they go beyond TWAIN capabilities.
>>
>> I'm beginning to realize that USB is not as simple as I thought but I
>> expected at least some common approach to the most basic level i.e.
>> identifying devices and then simple sending and receiving of bytes.
>>
>> Don.
>>
>> On Sat, 27 Nov 2004 13:42:20 +0100, "roland"
>> <roland.demeester@skynet.be> wrote:
>>
>> >Don
>> >I recently had to write an interface with a serial device that was
>connected
>> >through a usb-to-serial convertor. I spent some time browsing the net and
>I
>> >learned that there is no such thing as as a USB port and a USB protocol:
>you
>> >have to interface directly with the API's the USB driver for the device
>> >provides for.
>> >In my case the USB2COM convertor provided for a virtual serial port that
>I
>> >could communicate with, so it was fairly transparent. Unfortunately I
>cannot
>> >point you to any exemple that interfaces directly with the API's of a USB
>> >driver.
>> >Greetings, Roland
>> >
>> >"Don" <phoney.email@yahoo.com> wrote in message
>> >news:41a74dba.8602887@news.individual.net...
>> >> Environment: VB6 under W98
>> >>
>> >> I have a USB hardware device I wish to program directly. The original
>> >> software installed a low level driver and the hardware is both
>> >> registered and operational.
>> >>
>> >> Now then, I'd like to have access to this device directly. In other
>> >> words, I'd like to enumerate all devices on the USB bus, pick the one
>> >> I want, and then communicate with it (send commands, get data, etc).
>> >>
>> >> So, how does one go about talking to the USB? VB6/W98 combo doesn't
>> >> seem to have any dedicated USB routines.
>> >>
>> >> What I need - I guess - is the USB equivalent of the MSComm control.
>> >> Is there such a thing as a "USB Control"? What's the canonical way of
>> >> talking to USB from VB?
>> >>
>> >> I did google around a bit but couldn't find anything applicable. Most
>> >> sites and pages I came across seem to focus on actually writing a low
>> >> level USB driver.
>> >>
>> >> Thanks!
>> >>
>> >> Don.
>> >
>> >
>>
>
>
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