# ATC5 with GenTL

**URL:** <https://forum.commonvisionblox.com/t/atc5-with-gentl/2505>\
**Category:** C++ API\
**Tags:** acquisition\
**Created:** [September 15, 2026, 10:01am UTC](https://forum.commonvisionblox.com/t/atc5-with-gentl/2505 "2026-09-15T10:01:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Mikael](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@Mikael](https://forum.commonvisionblox.com/u/Mikael)\
**Post date:** [September 15, 2026, 10:01am UTC](https://forum.commonvisionblox.com/t/atc5-with-gentl/2505/1 "2026-09-15T10:01:17Z")

</div>

Hello,

I am trying to integrate an ATC5 camera under GenTL (third cvb acq. stack) un C++ on windows.

I have enable CHUNKs on the camera to get timestamps and encoder values.

The problem after “std::tie(composite, waitStatus, enumerator) = this-\>m\_datastream-\>WaitFor(TIMEOUT);” use.

My image type is Cvb::CompositePurpose::Custom !

How can I get the image pointer?

After I guess I will get chunks like I did it with VIN (atfer image buffer).

Thanks in advance,

Mikael.

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<div class="post-metadata">

**Author:** ![s-woe](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/s-woe/32/572_2.png) [@s-woe](https://forum.commonvisionblox.com/u/s-woe)\
**Post date:** [September 15, 2026, 10:20am UTC](https://forum.commonvisionblox.com/t/atc5-with-gentl/2505/2 "2026-09-15T10:20:32Z")

</div>

Hello @Mikael  
as far as I recall, C5 delivers multipart data. so you can access each of the parts with the following approach:

```auto
using namespace Cvb;
 
CompositePtr composite;
WaitStatus status;
NodeMapEnumerator nodeMaps;
std::tie(composite, status, nodeMaps) = stream->Wait();
 
for (int i = 0; i < composite->ItemCount(); i++)
{
  auto component = composite->ItemAt(i);
  if (auto image = get_if<ImagePtr>(&component))
  {      
    // Process image
  }
  else if (auto pointCloud = get_if<PointCloudPtr>(&component))
  {      
    // Process point cloud
  }
}

```

or, you iterate through the parts if you know what they are:

```auto
using namespace Cvb;
 
CompositePtr composite;
WaitStatus status;
NodeMapEnumerator nodeMaps;
std::tie(composite, status, nodeMaps) = stream->Wait();
 
auto part = composite->ItemAt(0);
if (auto image = get_if<ImagePtr>(&part ))
{
      // go on
}

```

if you started the device with AccessToken property “AttachChunk”, and did nothing else, (e.g. no manual set of ChunkModeActive node), the chunks are attached to the Device nodemap. There you find valid values for your current buffer.

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<div class="post-metadata">

**Author:** ![Mikael](https://avatars.discourse-cdn.com/v4/letter/m/f04885/32.png) [@Mikael](https://forum.commonvisionblox.com/u/Mikael)\
**Post date:** [September 15, 2026, 1:21pm UTC](https://forum.commonvisionblox.com/t/atc5-with-gentl/2505/3 "2026-09-15T13:21:46Z")

</div>

Hello @so-woe,

Thanks for your answer.

If chuncks are disabled in the camera, the composite purpose is “CompositePurpose::Image”. There is one composite count.

if chunks are enabled in the camera, the composite purpose is “CompositePurpose::Custom”. There is one composite count. And I cannot get an image:

```auto
auto element = composite->ItemAt(indexComposite);
auto image = Cvb::get_if<Cvb::ImagePtr>(&element); -> null

```

I don’t know what to do with composiye “Custom”. Maybe ATC5 + chunks it is not compatible with GenTL.

---

<div class="post-metadata">

**Author:** ![s-woe](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/s-woe/32/572_2.png) [@s-woe](https://forum.commonvisionblox.com/u/s-woe)\
**Post date:** [September 15, 2026, 1:45pm UTC](https://forum.commonvisionblox.com/t/atc5-with-gentl/2505/4 "2026-09-15T13:45:02Z")

</div>

Hello @Mikael ,  
No worries: ‘Custom’ just means: not a single Image, not an ImageCube, not an Image List, not a composed MultiAoi image, not a rangemap, and not a pointcloud. This is true, as the buffer contains an image and a chunk.

AT and chunk should be possible. Although, there are CVB versions which needed a fix. What version do you use?

Could you write to [this email](mailto:de.support@stemmer-imaging.com) with your exact CVB version, AT C5 version, your program, a log and your device nodemap settings.