->setContextProperty doesn't work

Quentin91

Hi !

I'm trying to send a QString to my QML code to print it on a window but I can't manage to use the QQmlApplicationEngine to set a context property.

Here's my code :

string tmpStr = testParams(); //returns a std::string. It works, np
char data[15];
int i= -1;
while((data[++i]!='\0')data[i]=tmpStr[i];/ /I know but fromStdString() did not work, I don't know why.
QString qstr(data);

QGuiApplication app(ai_argc, ai_argv);
QQmlApplicationEngine engine;
engine.addImportPath(QStringLiteral("../etc/qml"));

engine.rootContext()->setContextProperty("testStr",testQStr); //here is said "use of an undefined type 'QQmlType'" and
//Error C2027 :  "Pointer to an incomplete class forbidden"

engine.load(QUrl(QML_TEST1_PATH));

return app.exec();

I think I have to initialize engine, but this using of QQmlApplicationContext is not mine, so I guess that the problem is somewhere else or maybe it's because I use the version 5.12.0 of Qt ? How can I get my program to work and print the string read from my config file in the window ?

At the end I would like to be able to send information from QML to C++ too.

Thanks in advance

GrecKo

Add #include <QQmlContext>

dheerendra

You are not calling the method rootContext(). Change like follows.

engine.rootContext()->setContextProperty("testStr",testQStr);

J.Hilk

@Quentin91 to add what was already said,
Where is testQStr defined? I do Not see it in your code example

Quentin91

@J.Hilk I think it was just an error while re-writing my code. My dev computer has no internet connection. I was supposed to use qstr