basics about app.xaml

Rudolf Meier 291

the "App.xaml"... I've some questions about it

1) do we need it?
2) it it a file that is stored beside the exe? ... always? can I have this inside my exe?
3) ... ms-appx:///App.xaml ... what does that mean? is this some placeholder for... what?

... I think I'll have follow ups... but, for the moment those are the most interesting ones for me.

Rudolf

2 answers

Ken Tucker 5,851 Reputation points

2022-02-14T23:48:53.043+00:00

1) Yes we do it runs when the app starts
2) The file is in the exe

3) https://learn.microsoft.com/en-us/windows/uwp/app-resources/uri-schemes
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Rudolf Meier 291 Reputation points

2022-02-14T23:59:22.103+00:00

hmm... thanks for 3) ... but... about 2) "The file is in the exe" ... after compiling my app (native C++, WinUI 3), it generated an App.xaml beside my exe... and, when I delete it, it doesn't work anymore... so, seems it's loading this file which is outside my exe... is there something I have to change?
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Castorix31 84,471 Reputation points

2022-02-15T06:48:33.38+00:00

It is like WinMain in a C++ Desktop application
You can see explanations at Application Class
(with the Note : "The Application main file must be named App.xaml.")
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Rudolf Meier 291 Reputation points

2022-02-15T15:48:17.2+00:00

well... yes and no... because, I'm talking about a C++ desktop application and I do have a WinMain that is calling some stuff and in the end loading the App.xaml using the Application::LoadComponent function... and... the question is, if that's needed... because, that's really all it does in this case... and you still have to deliver this empty file... or, almost empty file

Castorix31 84,471 Reputation points

2022-02-16T06:56:08.817+00:00

In the C++/WindowsAppSDK App.xaml.cpp generated template, I have :

/// <summary> /// Initializes the singleton application object. This is the first line of authored code /// executed, and as such is the logical equivalent of main() or WinMain(). /// </summary> App::App()

then it calls

::winrt::Windows::Foundation::Uri resourceLocator{ L"ms-appx:///App.xaml" }; ::winrt::Microsoft::UI::Xaml::Application::LoadComponent(*this, resourceLocator);

which mainly loads

XamlControlsResources

(many XAML controls cannot work without this Dictionary)

then it creates the Microsoft::UI::Xaml::Window instance, like CreateWindow in a C++/Win32 app
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