Resetting the USB bus

[RichardB]

I am trying to Reset the USB bus.

I have a system with various USB devices attached to it including video
capture devices. Occasionally some of the USB devices either disappear or
fail to operate. Restarting the computer or unplugging and replugging the
device corrects this, however this is not a viable solution while the system
is running.

I'm looking for a way of resetting or re-initializing the USB bus or the USB
hub in the hope that this will reset the device. I can detect when the device
is not present in the software and therefore when to attempt to reset the
device or USB bus.

I tried the following code (in C#) to reset the USB line, but it throws an
exception:
public static void ListUSB()
{
System.Manageme nt.ObjectQuery objectQuery =
//new System.Manageme nt.ObjectQuery( "select * from CIM_USBControll er");
new System.Manageme nt.ObjectQuery( "select * from CIM_USBHub");

// search and get the list
System.Manageme nt.ManagementOb jectSearcher searcher = new
System.Manageme nt.ManagementOb jectSearcher(ob jectQuery);
System.Manageme nt.ManagementOb jectCollection list = searcher.Get();

// step through the list of devices
foreach (System.Managem ent.ManagementO bject item in list)
{
item.InvokeMeth od("Reset", null);
}
}
I have tried this with the CIM_USBHub and CIM_USBControll er classes.

Can anyone help or does anyone know how to do this?

Thanks
--
Richard

[Jeffrey Tan[MSFT]]

Hi Richard,

There are several replies to your questions in wmi and kernel newsgroup,
please follow up there. Thanks

Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
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