public int Selection { get; set; }
The zero-based index of the selected item; otherwise -1 if no item is selected.
Assigning a value to this property can raise an error exception. For more information, refer to the Error Codes.
using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;
public CaptureCtrlForm _form = new CaptureCtrlForm(false);
public bool _result = false;
public void AudioFormatExample()
{
try
{
int count, freq = 0, bits = 0, channels = 0;
int found, selected = -1;
// reference the capture control
CaptureCtrl capturectrl = _form.CaptureCtrl;
// set an audio device, use the name of your device here
if (capturectrl.AudioDevices["USB"] == null)
throw new Exception("No USB audio device available");
capturectrl.AudioDevices["USB"].Selected = true;
// get count of available audio formats
count = capturectrl.AudioCaptureFormats.Count;
// reset the current selection to -1
capturectrl.AudioCaptureFormats.Selection = -1;
// reference the audioformats property
AudioFormats audioformats = capturectrl.AudioCaptureFormats;
// enumerate formats and select one
foreach (AudioFormat af in audioformats)
{
freq = af.SampleFrequency;
bits = af.BitsPerSample;
channels = af.Channels;
// select the format if it matches some criteria
if (freq == 8000 && bits == 16 && channels == 2)
{
af.Selected = true;
break;
}
}
// get the currently selected format
selected = audioformats.Selection;
// find a format based on frequency, bits/channel and number of channels
found = audioformats.IndexOf(8000, 8, 2);
// our found format is not selected, so select it
if (found != selected)
audioformats.Selection = found;
// get the new selected format
selected = audioformats.Selection;
// set our result based on what we expect
_result = (count > 0 && selected == found);
}
catch (Exception)
{
_result = false;
}
}
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