Tuesday, January 16, 2024

Digest for comp.lang.c++@googlegroups.com - 5 updates in 2 topics

Lynn McGuire <lynnmcguire5@gmail.com>: Jan 16 04:03PM -0600

"We are doomed"
https://www.carette.xyz/posts/we_are_doomed/
 
"The only system with a good software compatibility that I know is
Windows, and this explains a ton of things keeping very old UI/UX
frameworks, software and APIs to run, for example, Windows 95 compatible
games like "Roller Coaster Tycoon"."
 
"Otherwise, you are doomed."
 
The C++ committee has screwed up and continues to screw up by not
creating a graphics standard for C++.
 
Lynn
bubu <bruno.donati@hotmail.fr>: Jan 16 08:52PM

Hi,
 
Sorry for my bad english and sorry for my bad level in qt.
 
I would like to use a qml program and c++ libraries (with import).
 
I use Visual Studio on windows.
 
I have several problems (and I put an example here-after) :
- how to use c++ with qml
- how to use a library written in c++ to use in a program in QML with
IMPORT statement.
- how to build executable and librarie with cmake?
 
My example is here :
 
main.qml
 
ApplicationWindow {
visible: true
width: 400
height: 300
title: "Calculator"
 
Calculatrice {
id: calculatrice
}
 
Column {
anchors.centerIn: parent
spacing: 10
 
TextField {
id: input1
placeholderText: "Entrez le premier nombre"
validator: DoubleValidator {
bottom: -1000000000.0
top: 1000000000.0
}
}
 
TextField {
id: input2
placeholderText: "Entrez le deuxième nombre"
validator: DoubleValidator {
bottom: -1000000000.0
top: 1000000000.0
}
}
 
Row {
spacing: 10
 
Button {
text: "Additionner"
onClicked: {
resultLabel.text = "Résultat: " +
calculator.add(parseFloat(input1.text), parseFloat(input2.text))
}
}
 
Button {
text: "Soustraire"
onClicked: {
resultLabel.text = "Résultat: " +
calculator.subtract(parseFloat(input1.text), parseFloat(input2.text))
}
}
 
Button {
text: "Multiplier"
onClicked: {
resultLabel.text = "Résultat: " +
calculator.multiply(parseFloat(input1.text), parseFloat(input2.text))
}
}
}
 
Label {
id: resultLabel
text: "Résultat: "
}
}
}
 
 
 
 
main.cpp
 
#include <QGuiApplication>#include <QQmlApplicationEngine>#include
<QtCore>//#include "calculator.cpp"int main(int argc, char* argv[]){
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv); QQmlApplicationEngine engine;
//qmlRegisterType<Calculator>("Calculator", 1, 0, "Calculator"); const
QUrl url(QStringLiteral("qrc:/main.qml"));
QObject::connect(&amp;engine, &amp;QQmlApplicationEngine::objectCreated,
&amp;app, [url](QObject* obj, const QUrl&amp; objUrl) { if
(!obj &amp;&amp; url == objUrl) QCoreApplication::exit(-1);
}, Qt::QueuedConnection); engine.load(url); return
app.exec();}
 
 
 
calculator.h
 
 
// calculator.h#ifndef CALCULATOR_H#define CALCULATOR_Hclass Calculator
{public: double add(double a, double b) const; double subtract(double a,
double b) const; double multiply(double a, double b) const;};
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