Sensor Usage Guidelines

The following steps use the sensor whose sensorTypeId is 0 as an example. The guidelines for other sensor types are similar.

How to Use

1. Import the required header files.

   #include "sensor_agent.h"
   #include "sensor_agent_type.h"

2. Create a sensor callback.

   void SensorDataCallbackImpl(SensorEvent *event)
   {
       if(event == NULL){
           return;
       }
       float *sensorData=(float *)event->data;
   }

   NOTE The callback must be of the RecordSensorCallback type.

3. Obtain the list of sensors supported by the device.

   SensorInfo *sensorInfo = (SensorInfo *)NULL;
   int32_t count = 0;
   int32_t ret = GetAllSensors(&sensorInfo, &count);

4. Create a sensor user.

   SensorUser sensorUser;
   sensorUser.callback = SensorDataCallbackImpl; // Assign the created callback SensorDataCallbackImpl to the member variable callback.

5. Enable the sensor.

   int32_t ret = ActivateSensor(0, &sensorUser);

6. Subscribe to sensor data.

   int32_t ret = SubscribeSensor(0, &sensorUser);

   NOTE Till now, you can obtain the sensor data via the callback.

7. Unsubscribe from the sensor data.

   int32_t ret = UnsubscribeSensor(0, &sensorUser);

8. Disable the sensor.

   int32_t ret = DeactivateSensor(0, &sensorUser);