[libcamera-devel] [PATCH 3/3] Documentation: application-developer: Add camera detection check
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Sun Sep 26 23:24:14 CEST 2021
On Mon, Sep 27, 2021 at 12:21:08AM +0300, Laurent Pinchart wrote:
> The simple-cam application has a check to ensure that at least one
> camera is present before attempting to access the first camera, to avoid
> a crash. Update the application developer's guide accordingly.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
> Documentation/guides/application-developer.rst | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/guides/application-developer.rst b/Documentation/guides/application-developer.rst
> index 41a7d88369be..11d3df15825b 100644
> --- a/Documentation/guides/application-developer.rst
> +++ b/Documentation/guides/application-developer.rst
> @@ -109,9 +109,16 @@ the Camera Manager reports as available to applications.
> Camera devices are stored by the CameraManager in a list accessible by index, or
> can be retrieved by name through the ``CameraManager::get()`` function. The
> code below retrieves the name of the first available camera and gets the camera
> -by name from the Camera Manager.
> +by name from the Camera Manager, after making sure that at least one camera is
> +available.
>
> .. code:: cpp
This is obviously missing a blank line here :-S I'll fix it in v2 (or
when pushing if no v2 is otherwise needed).
> + if (cm->cameras().empty()) {
> + std::cout << "No cameras were identified on the system."
> + << std::endl;
> + cm->stop();
> + return EXIT_FAILURE;
> + }
>
> std::string cameraId = cm->cameras()[0]->id();
> camera = cm->get(cameraId);
--
Regards,
Laurent Pinchart
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