Sensors Usage Guidelines

• How to Use

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"

1. 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.

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

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

1. Create a sensor user.

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

1. Enable the sensor.

int32_t ret = ActivateSensor(0, &sensorUser);

1. Subscribe to sensor data.

int32_t ret = SubscribeSensor(0, &sensorUser);

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

1. Unsubscribe from the sensor data.

int32_t ret = UnsubscribeSensor(0, &sensorUser);

1. Disable the sensor.

int32_t ret = DeactivateSensor(0, &sensorUser);