Application lifetime

This chapter describes how the lifetime of the application is handled. From the moment that the user executes the application, until the application exits or aborts.

There are 5 main phases of the application lifetime:

1. CRT Start
2. Application setup
3. Main Loop
4. Exit
5. CRT Finish

CRT Start

There are two main tasks for the hikogui's CRT:

Configure the operating system's API for compatibility with the hikogui library. In most cases this means turning off backward-compatibility, for example:

• On MacOS the CRT can tell the OS that the application can restore itself fully after being killed by the OS.

The second task is to call developer supplied hi_main() with cross platform compatible parameters. On Windows 10 this means that the wide-string argument list is unquoted, un-escaped and split into separate UTF-8 encoded arguments.

Application setup

The application set begins when the developer defined hi_main() is called by the CRT.

This is the part of the application where the developer can configure hikogui and initialize subsystems before the main loop is entered.