How to read an external file?

[khachkara]

Hi everyone. I wish to give as an argument to a text field of a TextArea an external text file? Is it possible, if yes how can I do it?

[sierdzio]

Read the file on C++ side and pass the text to QML. For example: https://doc.qt.io/qt-5/qtqml-cppintegration-topic.html

[khachkara]

Thank you for your response and a link, but I am a newcomer in programming and don't sure is it possible for me to do it in C++. I thought that it was possible to do it in QML.

[sierdzio]

@khachkara said in How to read an external file?:

I thought that it was possible to do it in QML.

No, or at least I don't know of any built-in way.

Don't be afraid of C++ though, it's really not that hard, and Qt documentation specifies exactly how to do it.

[HenkKalkwater]

@sierdzio said in How to read an external file?:

No, or at least I don't know of any built-in way.

It is possible by sending an XMLHttpRequest to a file URI, for example:

import QtQuick 2.15

Item {
	property string fileContents: ""
	Component.onCompleted: {
		var request = new XMLHttpRequest();
		request.onreadystatechange = function() {
			console.log("Ready state changed: %1".arg(request.readyState));
			if (request.readyState == XMLHttpRequest.DONE) {
				fileContents = request.responseText;
			}
		}
		request.open("GET", "file:/etc/os-release", true);
		request.send();
		console.log("Sending request");
	}

	Text {
		text: fileContents == "" ? "<Still loading>" : fileContents;
	}
}

I cannot find the documentation for this though, it´s something I heard someone say on a forum or IRC once and it apparently still works.

Writing by sending a PUT-request with data to a file URL is possible as well, but deprecated and potentionally dangerous.

[khachkara]

@HenkKalkwater thank you a lot. It works perfectly.