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IDirectInput8::EnumDevicesBySemantics Method

  • Artículo

Enumerates devices that most closely match the application-specified action map.

Syntax

HRESULT EnumDevicesBySemantics(
         LPCTSTR ptszUserName,
         LPDIACTIONFORMAT lpdiActionFormat,
         LPDIENUMDEVICESBYSEMANTICSCB lpCallback,
         LPVOID pvRef,
         DWORD dwFlags
)

Parameters

  • ptszUserName
    String identifying the current user, or NULL to specify the user logged onto the system. The user name is taken into account when enumerating devices. A device with user mappings is preferred to a device without any user mappings. By default, devices in use by other users are not enumerated for this user.
  • lpdiActionFormat
    Address of a DIACTIONFORMAT structure that specifies the action map for which suitable devices are enumerated.
  • lpCallback
    Address of a callback function to be called once for each device enumerated. See DIEnumDevicesBySemanticsCallback.
  • pvRef
    Application-defined 32-bit value to pass to the enumeration callback each time it is called.
  • dwFlags
    Flag value that specifies the scope of the enumeration. This parameter can be one or more of the following values.
    • DIEDBSFL_ATTACHEDONLY
      Only attached and installed devices are enumerated.
    • DIEDBSFL_AVAILABLEDEVICES
      Only unowned, installed devices are enumerated.
    • DIEDBSFL_FORCEFEEDBACK
      Only devices that support force feedback are enumerated.
    • DIEDBSFL_MULTIMICEKEYBOARDS
      Only secondary (non-system) keyboard and mouse devices.
    • DIEDBSFL_NONGAMINGDEVICES
      Only HID-compliant devices whose primary purpose is not as a gaming device. Devices such as USB speakers and multimedia buttons on some keyboards would fall within this value.
    • DIEDBSFL_THISUSER
      All installed devices for the user identified by ptszUserName, and all unowned devices, are enumerated.
    • DIEDBSFL_VALID
      DIEDBSFL_VALID is also defined in Dinput.h, but is not used by applications.

Return Value

If the method succeeds, the return value is DI_OK. If the method fails, the return value can be one of the following error values: DIERR_INVALIDPARAM, DIERR_NOTINITIALIZED.

Remarks

The keyboard and mouse are enumerated last.

Note

The order in which devices are enumerated by DirectInput is not guaranteed.

Requirements

Header: Declared in dinput.h.

See Also

IDirectInput8::EnumDevices