WdfUsbInterfaceGetNumSettings method
[Applies to KMDF and UMDF]
The WdfUsbInterfaceGetNumSettings method returns the number of alternate settings that a specified USB interface supports.
Syntax
BYTE WdfUsbInterfaceGetNumSettings(
[in] WDFUSBINTERFACE UsbInterface
);
Parameters
- UsbInterface [in]
-
A handle to a USB interface object that was obtained by calling WdfUsbTargetDeviceGetInterface.
Return value
WdfUsbInterfaceGetNumSettings returns the number of alternate settings that the specified USB interface supports.
A bug check occurs if the driver supplies an invalid object handle.
Remarks
Your driver can call WdfUsbInterfaceGetNumSettings after it has called WdfUsbTargetDeviceCreateWithParameters.
For more information about the WdfUsbInterfaceGetNumSettings method and USB I/O targets, see USB I/O Targets.
Examples
The following code example obtains the number of alternate settings that are available for a specified USB interface.
BYTE altSettings; altSettings = WdfUsbInterfaceGetNumSettings(UsbInterface);
Requirements
|
Minimum KMDF version | 1.5 |
|---|---|
|
Minimum UMDF version | 2.0 |
|
Header |
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|
Library |
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IRQL | <=DISPATCH_LEVEL |
|
DDI compliance rules | DriverCreate, KmdfIrql, KmdfIrql2, UsbKmdfIrql, UsbKmdfIrql2 |
See also
- WdfUsbTargetDeviceCreateWithParameters
- WdfUsbTargetDeviceGetInterface
- WdfUsbTargetDeviceSelectConfig
