private void startButton_Click(object sender, EventArgs e)
{
try
{
// Read UI controls
string cameraName = cameraComboBox.Text;
selectedAcquisitionType = (ImaqdxAcquisitionType)acquisitionModeComboBox.SelectedItem;
numBuffersUsed = (int)numberOfBuffersControl.Value;
selectedBufferWaitMode = bufferWaitMode.Text;
// Open a new session and configure a grab
_session = new ImaqdxSession(cameraName);
_session.Acquisition.Configure(selectedAcquisitionType, numBuffersUsed);
_session.Acquisition.Start();
// Update UI state
startButton.Enabled = false;
stopButton.Enabled = true;
numberOfBuffersControl.Enabled = false;
acquisitionModeComboBox.Enabled = false;
bufferWaitMode.Enabled = false;
cameraComboBox.Enabled = false;
// Start up background worker to acquire images
acquisitionWorker.RunWorkerAsync();
}
catch (ImaqdxException ex)
{
_session.Close();
_session = null;
MessageBox.Show(ex.Message, "NI-IMAQdx Error");
}
}
public static void ConfigureAcquisition(ImaqdxSessionHandle session, ImaqdxAcquisitionType acquisitionType, int bufferCount)
{
Debug.Assert(session != null, "The session parameter cannot be null.");
Debug.Assert(!session.IsInvalid, "The session parameter must be a valid handle.");
Debug.Assert(bufferCount > 0, "The bufferCount parameter must be greater than zero.");
bool isContinuous = (acquisitionType == ImaqdxAcquisitionType.Continuous);
int status = NiImaqdxDll.IMAQdxConfigureAcquisition(session, Convert.ToUInt32(isContinuous), (uint)bufferCount);
ExceptionBuilder.CheckErrorAndThrow(status);
}
//==========================================================================================
/// <summary>
/// Configures a low-level acquisition.
/// </summary>
/// <param name="acquisitionType">
/// Specifies whether the acquisition is <see cref="NationalInstruments.Vision.Acquisition.Imaqdx.ImaqdxAcquisitionType.Continuous" crefType="Unqualified"/> or <see cref="NationalInstruments.Vision.Acquisition.Imaqdx.ImaqdxAcquisitionType.SingleShot" crefType="Unqualified"/>.
/// </param>
/// <param name="bufferCount">
/// For a <see cref="NationalInstruments.Vision.Acquisition.Imaqdx.ImaqdxAcquisitionType.SingleShot" crefType="Unqualified"/>, this parameter specifies the number of images to acquire. For a continuous acquisition, this parameter specifies the number of buffers the driver uses internally.
/// </param>
/// <exception cref="System.ObjectDisposedException">
/// The session has been disposed.
/// </exception>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <paramref name="bufferCount"/> is less than or equal to zero.
/// </exception>
//==========================================================================================
public void Configure(ImaqdxAcquisitionType acquisitionType, int bufferCount)
{
_session.ValidateSessionHandle();
if (!Enum.IsDefined(typeof(ImaqdxAcquisitionType), acquisitionType))
{
throw ExceptionBuilder.InvalidEnumArgument("acquisitionType", (int)acquisitionType, typeof(ImaqdxAcquisitionType));
}
if (bufferCount <= 0)
{
throw ExceptionBuilder.ArgumentOutOfRange("bufferCount");
}
ImaqdxSessionManager.ConfigureAcquisition(_session.Handle, acquisitionType, bufferCount);
}
