This Example shows how to use DLT.

First we need to register our example application with the dlt-daemon.

QDLT_REGISTER_APPLICATION("APP1", "Description for APP")

Our application is now registered under the id APP1. All logging categories registered are associated with this id. The description is only used within the dlt-viewer application and is useful to further describe the application as the four byte long id is not very descriptive.

The next step is to register our logging categories and a fallback category. The fallback category is used for all logs, which are either uncategorized e.g. by using qDebug instead of qCDebug or are using a Qt message category which is not registered as a DLT category.

QDLT_LOGGING_CATEGORY(FOO, "com.pelagicore.foo", "FOO", "FOO CATEGORY")
QDLT_LOGGING_CATEGORY(BAR, "com.pelagicore.bar", "BAR", "BAR CATEGORY")

QDLT_FALLBACK_CATEGORY(FOO)

Similar to the Q_LOGGING_CATEGORY macro, the first two arguments define the category's name and the identifier used to control the category. In addition, every DLT logging category needs to have a four byte long id and a description. These last two fields are used to identify the logs in the dlt-viewer.

The final step to enable DLT logging is to register the special dlt messageHandler.

    qInstallMessageHandler(QDltRegistration::messageHandler);

This handler will pick-up the logs and send it to the dlt-daemon.

{The example application and its logging categories in the dlt-viewer}

Files:

• qdlt/loggingcategories.cpp
• qdlt/loggingcategories.h
• qdlt/main.cpp
• qdlt/qdlt.pro