|Microsoft DirectX 9.0|
The get_VideoFrequency method retrieves the current video frequency.
HRESULT get_VideoFrequency( long *lFreq );
[out] Pointer to a variable that receives the video frequency, in hertz (Hz).
Returns an HRESULT value that depends on the implementation of the interface.
This is a diagnostic method that enables you to examine the exact frequency being used for a given channel.