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WinUsb_QueryPipeEx routine

The WinUsb_QueryPipeEx function retrieves extended information about the specified endpoint and the associated pipe for an interface.


BOOL __stdcall WinUsb_QueryPipeEx(
  _In_   WINUSB_INTERFACE_HANDLE InterfaceHandle,
  _In_   UCHAR AlternateInterfaceNumber,
  _In_   UCHAR PipeIndex,


InterfaceHandle [in]

An opaque handle to an interface that contains the endpoint with which the pipe is associated.

To query the pipe associated with an endpoint in the first interface, use the handle returned by WinUsb_Initialize. For all other interfaces, use the handle to the target interface, retrieved by WinUsb_GetAssociatedInterface.

AlternateInterfaceNumber [in]

A value that specifies the alternate interface to return the information for.

PipeIndex [in]

A value that specifies the pipe to return information about. This value is not the same as the bEndpointAddress field in the endpoint descriptor. A PipeIndex value of 0 signifies the first endpoint that is associated with the interface, a value of 1 signifies the second endpoint, and so on. PipeIndex must be less than the value in the bNumEndpoints field of the interface descriptor.

PipeInformationEx [out]

A pointer, on output, to a caller-allocated WINUSB_PIPE_INFORMATION_EX structure that contains pipe information.

Return value

WinUsb_QueryPipeEx returns TRUE if the operation succeeds. Otherwise, this function returns FALSE, and the caller can retrieve the logged error by calling GetLastError.

GetLastError can return the following error code.

Return codeDescription

The caller passed NULL in the InterfaceHandle parameter.


The caller passed NULL in the PipeInformation parameter; interface descriptor could not be found for the handle specified in InterfaceHandle.


The value passed in the PipeIndex parameter is greater than the bNumEndpoints value of the interface descriptor; endpoint descriptor could not be found for the specified interface.



The WinUsb_QueryPipeEx function does not retrieve information about the control pipe.



Winusb.h (include Winusb.h)



See also

WinUSB Functions
Send USB isochronous transfers from a WinUSB desktop app



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