Using Chunk Mode Data with CVB.NET

Programming Questions .Net API
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2

Hi @AGrafton,

for this example you need to configure the C5 being the first camera and image data being delivered as raw:

using (var device = DeviceFactory.Open("GenICam.vin"))
{
  var nodemap = device.NodeMaps[NodeMapNames.Device];
  var chunkModeActive = nodemap["ChunkModeActive"] as BooleanNode;
  chunkModeActive.Value = true;

  var stream = device.Stream;
  stream.Start();
  try
  {
    stream.Wait();
    var deviceImage = device.DeviceImage;

    var chunks = GevChunkParser.Parse(deviceImage);
    var info = DereferenceAcqInfoOn(deviceImage, chunks.First(chunk => chunk.ID == ATC5AcqInfoChunk.ID));

    Console.WriteLine($"FrameCount: {info.FrameCount}");
  }
  finally
  {
    stream.Stop();
  }
}

With this helper method and struct:

private static unsafe ATC5AcqInfoChunk DereferenceAcqInfoOn(DeviceImage image, GevChunk chunk)
{
  Debug.Assert(chunk.ID == ATC5AcqInfoChunk.ID);
  Debug.Assert(chunk.Length >= sizeof(ATC5AcqInfoChunk));

  var chunkPtr = new IntPtr(image.GetBufferBasePtr().ToInt64() + chunk.Offset);
  return *(ATC5AcqInfoChunk*)chunkPtr;
}

[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct ATC5AcqInfoChunk
{
  public const uint ID = 0x66669999;

  public uint TimeStampLow;
  public uint TimeStampHigh;
  public uint FrameCount;
  public int TriggerCoordinate;
  public byte TriggerStatus;
  public ushort DAC;
  public ushort ADC;
  public byte IntIdX;
  public byte AoiIdX;
  public ushort AoiYs;
  public ushort AoiDy;
  public ushort AoiXs;
  public ushort AoiThreshold;
  public byte AOIAlgorithm;
}

For this to work you need these three new classes I put on github:

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