WVR_TrackerInfoCallback¶
-
typedef void (*
WVR_TrackerInfoCallback
)(WVR_TrackerId trackerId, const char *cbInfo, uint64_t *timestamp)¶ The callback function template of tracker info notify.
- Version
- API Level 9
- Parameters
rtrackerId
: Indicates what id of the tracker device. (Refer to WVR_TrackerId.)cbInfo
: tracker info content.timestamp
: timestamp for tracker info content.
Warning
- This function template only works at API level 9 or later.
How to use¶
Here is an example for the function:
- Header & global variable.
#include <wvr/wvr.h> // for enum WVR_SupportedFeature
#include <wvr/wvr_tracker.h>
#include <wvr/wvr_types.h>
bool gRunningTR = false;
- 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;
}
- Refer to this function template WVR_TrackerInfoCallback to implement the callback function for function WVR_RegisterTrackerInfoCallback.
void CustomizedTrackerInfoCallback(WVR_TrackerId trackerId, const char *cbInfo, uint64_t *cbTimestamp);
void CustomizedTrackerInfoCallback(WVR_TrackerId trackerId, const char *cbInfo, uint64_t *cbTimestamp) {
LOGD("CustomizedTrackerInfoCallback, WVR_TrackerId(%d), cbInfo(%s), cbTs(%" PRId64 ")", trackerId, cbInfo, *cbTimestamp);
// TODO: The developer might want to do something corresponding to this function call.
}
Note
- See also WVR_RegisterTrackerInfoCallback.
- See also Tracker Info Notification.