libusb-devel

[Libusb-devel] usb_control_msg error

[UsbNoob <pk...@ho...>]

Hi, i'm currently trying to read from a usb flash drive and right now i have
a problem with usb_control_msg which is giving me an error value of -5. 

Does anyone know what are the parameters for my usb_control_msg to get it
correct? Or does that depends on the flash drive i'm using?

I'm new to this and been working on it awhile hope someone can help me.
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Re: [Libusb-devel] usb_control_msg error

[Peter S. <stu...@cd...>]

Hi Noob,

On Wed, Jul 30, 2008 at 08:15:25AM -0700, UsbNoob wrote:
> Hi, i'm currently trying to read from a usb flash drive

Why are you trying to do this using libusb?

Note that the kernel probably already has a storage driver attached
to the device.


//Peter

Re: [Libusb-devel] usb_control_msg error

[UsbNoob <pk...@ho...>]

My project requires the use of C#. And will be needing to write to flash
drive later as well if only i can solve this error first. Any suggestions?


Peter Stuge-2 wrote:
> 
> Hi Noob,
> 
> On Wed, Jul 30, 2008 at 08:15:25AM -0700, UsbNoob wrote:
>> Hi, i'm currently trying to read from a usb flash drive
> 
> Why are you trying to do this using libusb?
> 
> Note that the kernel probably already has a storage driver attached
> to the device.
> 
> 
> //Peter
> 
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Re: [Libusb-devel] usb_control_msg error

[Alan S. <st...@ro...>]

On Wed, 30 Jul 2008, UsbNoob wrote:

> My project requires the use of C#. And will be needing to write to flash
> drive later as well if only i can solve this error first. Any suggestions?

What's so hard about writing to a flash drive?  It should work exactly 
the same as writing to any other drive.

What difference does it make what language your program is in?

And what exactly is the error you got?  You never provided any details.

Alan STern

Re: [Libusb-devel] usb_control_msg error

[Tim R. <ti...@pr...>]

UsbNoob wrote:
> My project requires the use of C#. And will be needing to write to flash
> drive later as well if only i can solve this error first. Any suggestions?
>   

Yes.  Treat this as a normal disk drive, not as  USB device.  If you 
need to write to absolute raw sectors, use the "\\.\D:" method or the 
"\\.\PhysicalDrive2" method.

USB drives follow the SCSI protocol.  To talk to one, you have to 
pretend you are talking to a SCSI device, plus the USB wrapping.  You do 
not want to go down that path.

-- 
Tim Roberts, ti...@pr...
Providenza & Boekelheide, Inc.