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Python AppLifecycle single instance

This Windows App SDK sample launches two Python processes and demonstrates:

  • registering a primary instance with AppInstance;
  • retrieving the second process's activation arguments;
  • redirecting activation asynchronously to the primary process; and
  • receiving and unsubscribing from the typed Activated event.

Prerequisites

  • WinApp CLI 0.6.2 or newer;
  • dynwinrt installed in the selected Python interpreter; and
  • dynwinrt-codegen on PATH, or passed with -Codegen.

Run

winapp restore
.\generate.ps1 -Codegen ..\..\..\target\release\dynwinrt-codegen.exe

.\run.ps1 -Python C:\path\to\python.exe -Major 2 -Minor 3

winapp restore prepares the pinned SDK metadata and bootstrap binaries under .winapp\. generate.ps1 uses that metadata to generate Python bindings and copies the selected architecture's bootstrap DLL to .runtime\.

Major and Minor default to 2 and 3. They must exactly match the Windows App SDK product version represented by the metadata, bootstrap DLL, and installed runtime.

The loopback succeeds only after the secondary process redirects its launch activation and the primary receives it. It prints python-app-lifecycle-ok.