|Microsoft DirectX 9.0|
The get_SignalStrength method retrieves the Network Provider-specific signal strength metric.
HRESULT get_SignalStrength( long* pStrength );
[out] Pointer to a variable that receives the signal strength.
When the method is successful, it returns S_OK. Otherwise, it returns an HRESULT error code.
The value -1 means can't determine, 0 means not tuned, highest value means best signal. For digital tuners, this also accounts for the FEC bit error rate (BER).