IKsJackDescription::GetJackDescription method (devicetopology.h)

The GetJackDescription method gets a description of an audio jack.


HRESULT GetJackDescription(
  [in]  UINT               nJack,
  [out] KSJACK_DESCRIPTION *pDescription


[in] nJack

The jack index. If the connection consists of n jacks, the jacks are numbered from 0 to n– 1. To get the number of jacks, call the IKsJackDescription::GetJackCount method.

[out] pDescription

Pointer to a caller-allocated buffer into which the method writes a structure of type KSJACK_DESCRIPTION that contains information about the jack. The buffer size must be at least sizeof(KSJACK_DESCRIPTION).

Return value

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code Description
Parameter nJack is not a valid jack index.
Pointer pDescription is NULL.


When a user needs to plug an audio endpoint device into a jack or unplug it from a jack, an audio application can use the descriptive information that it retrieves from this method to help the user to find the jack. This information includes:

  • The physical location of the jack on the computer chassis or external box.
  • The color of the jack.
  • The type of physical connector used for the jack.
  • The mapping of channels to the jack.
For more information, see KSJACK_DESCRIPTION.


Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header devicetopology.h

See also

IKsJackDescription Interface