GetDescriptor

This function sends a GET_DESCRIPTOR request to a USB device.

Syntax

USB_TRANSFER GetDescriptor( USB_HANDLE hDevice, LPTRANSFER_NOTIFY_ROUTINE lpStartAddress,
LPVOID lpvNotifyParameter, DWORD dwFlags, UCHAR bType,
UCHAR bIndex, WORD wLanguage, WORD wLength, LPVOID lpvBuffer );

Parameters

hDevice

[IN] Handle to a USB device.

lpStartAddress

[IN] Pointer to the address, which may be NULL, of a callback routine.

lpvNotifyParameter

[IN] Pointer to the parameter to pass to a callback routine.

dwFlags

[IN] Either of the values USB_NO_WAIT or 0.

bType

[IN] The descriptor type, one of the values USB_DEVICE_DESCRIPTOR_TYPE, USB_CONFIGURATION_DESCRIPTOR_TYPE, USB_STRING_DESCRIPTOR_TYPE, or a vendor-specific value.

bIndex

[IN] Index within a descriptor.

wLanguage

[IN] Specifies a language IDENTIFIER for string descriptors, 0 for others.

wLength

[IN] Specifies the size of the buffer.

lpvBuffer

[IN] Pointer to a buffer for descriptor data.

Remarks

This function initiates a control transfer to a USB device requesting device descriptor information. The device returns the contents of the device descriptor, starting at the index specified.

This function is defined in the Mousedrv.cpp file.

See Also

AbortTransfer, GetTransferStatus, IsTransferComplete, SetDescriptor