Accelerometer on iphone

I don’t understand how to use the accelerometer , please I need some help

  1. in MyLayer::init(), call this~~>setIsAccelerometerEnabled;
    # implement MyLayer::didAccelerate in you layer
    Sample code in tests/AccelerometerTest/AccelerometerTest.cpp
    <pre>
    void AccelerometerTest::didAccelerate
    {
    CCDirector* pDir = CCDirector::sharedDirector;
    CCSize winSize = pDir~~>getWinSize();

/*FIXME: Testing on the Nexus S sometimes m_pBall is NULL /
if {
return;
}
CCSize ballSize = m_pBall~~>getContentSize;
CCPoint ptNow = m_pBall~~>getPosition;
CCPoint ptTemp = pDir~~>convertToUI;
ptTemp.x += pAccelerationValue~~>x
9.81f;
ptTemp.y = pAccelerationValue>y * 9.81f;

CCPoint ptNext = pDir~~>convertToGL;
FIX_POS, );
FIX_POS, );
m_pBall~~>setPosition(ptNext);
}

Thank you very much