public SygnalAnalyzerForm()
{
InitializeComponent();
_wfmt = new WaveFormat();
_wfmt.SetPCMFormat(11025, 1, 16);
_bufferSize = FFT.NextPowerOfTwo((UInt32)(_wfmt.BytesPerSecond * FFT_SPEED));
_numSamples = 0;
_numOutBuffers = 0;
// ------------------------------------------------------
InputZGraphCtrl.GraphPane.Title.Text = "Input, mV";
InputZGraphCtrl.GraphPane.XAxis.Title.Text = "time, ms";
InputZGraphCtrl.GraphPane.YAxis.Title.Text = "signal, mV";
InputZGraphCtrl.GraphPane.XAxis.MinorGrid.IsVisible = true;
InputZGraphCtrl.GraphPane.YAxis.MinorGrid.IsVisible = true;
SpectrumZGraphCtrl.GraphPane.Title.Text = "Spectrum, dB";
SpectrumZGraphCtrl.GraphPane.XAxis.MinorGrid.IsVisible = true;
SpectrumZGraphCtrl.GraphPane.YAxis.MinorGrid.IsVisible = true;
SpectrumZGraphCtrl.GraphPane.YAxis.Type = AxisType.Log;
SpectrumZGraphCtrl.GraphPane.YAxis.Title.Text = "Amplitude, db";
SpectrumZGraphCtrl.GraphPane.XAxis.Title.Text = "frequency, Hz";
}
public int Open(int deviceId, WaveFormat wfmt)
{
int mmr = WaveConstants.MMSYSERR_HANDLEBUSY;
if (!IsOpen())
{
_Callback = new DriverCallback(waveOutProc);
GCHandle handle = GCHandle.Alloc(_Callback);
mmr = WaveOutput.waveOutOpen(ref _hWaveOut, deviceId, ref wfmt.wfmt.Format,
Marshal.GetFunctionPointerForDelegate(_Callback),
IntPtr.Zero,
WaveConstants.CALLBACK_FUNCTION);
handle.Free();
if (mmr == WaveConstants.MMSYSERR_NOERROR)
{
Interlocked.Exchange(ref _DeviceState, (int)WaveStatus.waveStopped);
}
}
return mmr;
}