WVR_EXPORT WVR_Result WVR_UnregisterTrackerInfoCallback()

Function to unregister an info notify of tracker.

API Level 9
Return Value
  • WVR_Success: start the tracker feature successfully.
  • others: means failure. (Refer to WVR_Result.)


  • This function only works at API level 9 or later.

How to use

Here is an example for the function:

  1. Header & global variable.
#include <wvr/wvr.h> // for enum WVR_SupportedFeature
#include <wvr/wvr_tracker.h>
#include <wvr/wvr_types.h>

bool gRunningTR = false;
  1. Start tracker feature first if it has not been started yet. (See also WVR Supported Features)
if (WVR_GetSupportedFeatures() & WVR_SupportedFeature_Tracker) { // the tracker feature is supported or not
    WVR_Result res = WVR_StartTracker();
    if (res == WVR_Success) gRunningTR = true;
  1. Use function WVR_UnregisterTrackerInfoCallback to unregister callback function. Then, the implemented callback function will not be called.
if (gRunningTR) {
    WVR_Result ret = WVR_UnregisterTrackerInfoCallback();