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Diffstat (limited to 'Documentation/guides/application-developer.rst')
| -rw-r--r-- | Documentation/guides/application-developer.rst | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/Documentation/guides/application-developer.rst b/Documentation/guides/application-developer.rst index 9a9905b1..25beb55d 100644 --- a/Documentation/guides/application-developer.rst +++ b/Documentation/guides/application-developer.rst @@ -1,5 +1,7 @@ .. SPDX-License-Identifier: CC-BY-SA-4.0 +.. include:: ../documentation-contents.rst + Using libcamera in a C++ application ==================================== @@ -116,19 +118,21 @@ available. .. code:: cpp - if (cm->cameras().empty()) { + auto cameras = cm->cameras(); + if (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); + std::string cameraId = cameras[0]->id(); + auto camera = cm->get(cameraId); /* - * Note that is equivalent to: - * camera = cm->cameras()[0]; + * Note that `camera` may not compare equal to `cameras[0]`. + * In fact, it might simply be a `nullptr`, as the particular + * device might have disappeared (and reappeared) in the meantime. */ Once a camera has been selected an application needs to acquire an exclusive @@ -479,7 +483,7 @@ instance. An example of how to write image data to disk is available in the `FileSink class`_ which is a part of the ``cam`` utility application in the libcamera repository. -.. _FileSink class: https://git.libcamera.org/libcamera/libcamera.git/tree/src/cam/file_sink.cpp +.. _FileSink class: https://git.libcamera.org/libcamera/libcamera.git/tree/src/apps/cam/file_sink.cpp With the handling of this request completed, it is possible to re-use the request and the associated buffers and re-queue it to the camera |