IWDFIoQueue::GetState method (wudfddi.h)

[Warning: UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2. For more info, see Getting Started with UMDF.]

The GetState method retrieves the state of an I/O queue.

Syntax

WDF_IO_QUEUE_STATE GetState(
  [out] ULONG *pulNumOfRequestsInQueue,
  [out] ULONG *pulNumOfRequestsInDriver
);

Parameters

[out] pulNumOfRequestsInQueue

A pointer to a variable that receives the number of I/O requests that are currently in the I/O queue (that is, that have not been delivered to the driver).

[out] pulNumOfRequestsInDriver

A pointer to a variable that receives the number of I/O requests that the driver accepted from the I/O queue but that the driver has not completed, canceled, or forwarded to another I/O queue.

Return value

GetState returns a bitwise OR of WDF_IO_QUEUE_STATE-typed values that provides the state of the queue.

Remarks

The total number of requests that are associated with the I/O queue is the sum of the values that the pulNumOfRequestsInQueue and pulNumOfRequestsInDriver parameters point to.

Requirements

See also

IWDFIoQueue

WDF_IO_QUEUE_STATE