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WinUsb_GetCurrentAlternateSetting function

The WinUsb_GetCurrentAlternateSetting function gets the current alternate interface setting for an interface. This is a synchronous operation.

Syntax


BOOL __stdcall WinUsb_GetCurrentAlternateSetting(
  _In_   WINUSB_INTERFACE_HANDLE InterfaceHandle,
  _Out_  PUCHAR AlternateSetting
);

Parameters

InterfaceHandle [in]

An opaque handle to an interface in the selected configuration. To get the current alternate setting in the first (default) interface on the device, use the interface handle returned by WinUsb_Initialize. For all other interfaces, use the handle to the target interface, retrieved by WinUsb_GetAssociatedInterface.

AlternateSetting [out]

A pointer to an unsigned character that receives an integer that indicates the current alternate setting.

Return value

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

GetLastError can return the following error code.

Return codeDescription
ERROR_INVALID_HANDLE

The caller passed NULL in the InterfaceHandle parameter.

 

Requirements

Header

Winusb.h (include Winusb.h)

Library

Winusb.lib

See also

WinUSB
WinUsb_Initialize
WinUSB Functions

 

 

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