Qt6 how to load qml sources at runtime

[d_h_mcinnes]

Hi
How do I make a qt6 cmake-based app load qml sources at runtime? I have an embedded target, and I want to be able to edit qml files on the device instead of recompiling & redeploying.

I have example code here: https://github.com/DanielMcInnes/helloQmlTc branch: 'load-qml-at-runtime')

I can't see any options in qt_add_qml_module that do what I want. NO_CACHEGEN doesn't do it.

I tried the following, without success. Any edits after building are ignored.

Loader {
		anchors.bottom: parent.bottom
		source: "file:///path/to/MyRectangle.qml"
	}

[Axel Spoerl]

@d_h_mcinnes
You're doing the right thing. The path to MyRectangle.qml must be available at run time. You might wanna at the qml file as a resource, to be sure of that.

[d_h_mcinnes]

@Axel-Spoerl Thank you. By adding the qml file as a resource, and doing:

Loader {
    source: "file:///path/to/MyRectangle.qml" // loads qml at runtime
    // source: "qrc:/MyRectangle.qml"         // loads whatever the source was at compile time
}

... I can get a Loader to load qml at runtime. However, for my use case, I need all of my qml types to load at runtime without using a Loader.

eg. in the following code, I need 'first' to be loaded at runtime.

	MyRectangle { id: first } // this is defined at compile time

	Loader {
		anchors.bottom: parent.bottom
		source: "file:///path/to/MyRectangle.qml"  // this is defined at run time
	}

I think this might be a bug / lack of documentation, I'll file a bug and see what the developers say.

[d_h_mcinnes]

created https://bugreports.qt.io/browse/QTBUG-120435

[d_h_mcinnes]

@Axel-Spoerl , fyi I got a reply in my bug report that got this working for me. The details are in the ticket, but the magic step is to manually remove the 'prefer' line from MyModule/qmldir in the build directory.