Does Meego Nokia N950 support C++ QML binding? - c++

I want to communicate between C++ and QML on Meego. It happens using C++ QML binding as described in this link.
When I run an app on the Symbian platform it works, and data from C++ is available to manipulate in some QML file.
But on Meego it always says myItem.qml file not found.
See the following code snippet:
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QDeclarativeView view;
MyClass myClass;
view.rootContext()->setContextProperty("myObject", &myClass);
view.setSource(QUrl::fromLocalFile("MyItem.qml"));
view.show();
return app.exec();
}
Does Meego does not support QML C++ binding?
I also tried to give the exact path of the QML file but never found that file, even myItem is in project structure.
Is there some thing associated with path settings in .pro file etc
Please help on this as I am stuck here with this and cannot move forward in my app using Qt Quick.

Yes, but your problem isn't related to C++ and QML bindings. Your application (specifically the view) can't find the .qml file to load.
By default, I think on meego the default path to look in is ../qml. So by default you should be packaging into /opt/YOURNAME with the binary in /opt/YOURNAME/bin and the qml files in /opt/YOURNAME/qml.
However, you can also put the qml files into a resource and use the :/ paths to access a resource instead.
IE, in your resource file:
<RCC>
<qresource prefix="/">
<file>qml/foo.qml</file>
</qresource>
</RCC>
And in C++:
viewer.setSource(QUrl("qrc:/qml/foo.qml"));

Related

Reading file from working directory QtWebEngine

Hello I am trying to set the QWebEngine URL to an index.html file that is placed in the working directory.
I am trying to use the file by setting the URL to ./index.html but it cant seem to find the file.
Here is where my files are placed
content (Work directory)
main.cpp
content.pro
index.html
How can i open index.html through the QWebEngine without using the full system path?
here is my code
#include <QApplication>
#include <QWebEngineView>
int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QApplication app(argc, argv);
QWebEngineView view;
view.setUrl(QUrl(QStringLiteral("file:///./index.html")));
view.resize(1024, 750);
view.show();
return app.exec();
}
Try moving the html file to your project build directory (you're currently keeping it inside the source directory). Then you can build your URL this way:
QUrl url = QUrl::fromLocalFile(QDir::currentPath() + "/index.html");
and set it to the view:
QWebEngineView view;
view.setUrl(url);
view.resize(1024, 750);
view.show();
From http://doc.qt.io/qt-5/qurl.html
qDebug() << QUrl("main.qml").isRelative(); // true: no scheme
qDebug() << QUrl("qml/main.qml").isRelative(); // true: no scheme
qDebug() << QUrl("file:main.qml").isRelative(); // false: has "file" scheme
qDebug() << QUrl("file:qml/main.qml").isRelative(); // false: has "file" scheme
Try: view.setUrl(QUrl(QStringLiteral("index.html")));
As p-a-o-l-o pointed out in his answer, you're likely building out-of-source, so your index.html file has to be in the folder where content.exe is created, not in the source folder.
To make this less complicated, and safer, Qt supports embedding files in the .exe via Qt Resource files (.qrc). These can easily be created in Qt Creator, and once added to the project, the embedded files are accessed via a qrc:/// prefix.
So in your sample code, after adding a .qrc file to your project and adding index.html to it, you would adjust your code like this:
view.setUrl(QUrl(QStringLiteral("qrc:///index.html")));
This has the advantage of working regardless of build type or location, and it's a lot simpler than trying to add a file copy step to your project file (or to manually copy the file each time)

How to include an icon in the title bar of window in Qt?

I want to be able to replace the existing standard icon with my own but I am unsure how to do so. I only started Qt one week ago so I don't know much about the application. In addition to this I looked at the Qt website but their method for adding an icon did not work on my computer.
Besides using a RC file (Windows) you may specify the icon directly using qmake.
win32: RC_ICONS = icon.ico
Make sure it detects the path correctly. In the provided case the icon resides in the project root directory right beside the project file.
For window icons you typically, if application wide applicable, use some method of QApplication.
...
QApplication app(argc, argv);
...
app.setWindowIcon(QIcon(":/icon");
...
which is consuming the resource file using the alias icon. Here is an example (res.qrc):
<RCC>
<qresource prefix="/">
<file alias="icon">icon.png</file>
</qresource>
</RCC>
More information on resources are here.
Perhaps try the function setWindowIcon function on the QWidget or QApplication.

QT 5.4, Unable to access Resource from code

I try to include style images of my app into a q-resource file.
When I include the file directly in the code, it work, but when i try to use QResource, it fail (do not load the file).
I have the resource file in the main directory:
AppFolder
|- main.cpp
|- darkstyle.qrc
|- darkstyle
|- WindowTitleBar.png
The following example print:
failed1
failed2
#include <QApplication>
#include <QResource>
#include <Qfile>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
bool ok= QResource::registerResource("darkstyle.qrc");
if (!ok) qDebug()<<"failed1";
QFile file(":/darkstyle/WindowTitleBar.png");
//QFile file("../AppFolder/darkstyle/WindowTitleBar.png"); //that work
if(!file.open(QFile::ReadOnly | QFile::Text)) qDebug()<<"failed2";
else file.close();
//return a.exec();
return 0;
}
Note: Qt creator by default create binaries (.exe) in a top folder: ../build-AppFolder_Qt_5_4_1_MSVC2013_64bit-Debug/debug/AppFolder.exe
The execution root path seem to be: ../build-AppFolder_Qt_5_4_1_MSVC2013_64bit-Debug
I tried most of possible combinations with execution paths.
Note2: Some examples use a .rcc file format, I have none of these, but that could be a clue.
Summary:
How to access a QResource file from inside a QT app?
EDIT 1: Content of qrc file:
<RCC>
<qresource prefix="/">
<file>darkstyle/WindowTitleBar.png</file>
<file>darkstyle/WindowTitleButton.png</file>
<file>darkstyle/WindowTitleButton1.png</file>
<file>darkstyle/WindowTitleButton2.png</file>
<file>darkstyle/WindowTitleButton3.png</file>
</qresource>
</RCC>
QResource::registerResource("darkstyle.qrc") registers the resource description. If you want to use resources dynamically like this you need to register the compiled resources themselves. Run rcc -binary darkstyle.qrc -o darkstyle.rcc and use QResource::registerResource("darkstyle.rcc")
Alternatively, compile the resources into your binary directly. Do do so, use RESOURCES += darkstyle.qrc in your .qrc, and leave out the QResource::registerResource.
The problem is related to an incompatibility of the given version of QT with MSVS2013.
The problem is solved by downloading another version of QT or visual studio.

Qt - QFile not opening a .qss file

I'm trying to use an external stylesheet for my project and I'm having trouble opening it using the QFile class. I've imported it into the .qrc file, a portion of it looks like this:
<qresource prefix="stylesheets">
<file>Resources/Stylesheet.qss</file>
</qresource>
This is how I am opening and using the file:
QFile stylesheet(":/stylesheets/Resources/Stylesheet.qss");
if (stylesheet.open(QIODevice::ReadOnly | QIODevice::Text))
{
newGameDialog.setStyleSheet(stylesheet.readAll());
stylesheet.close();
}
What could be wrong with this? I am using Visual Studio 2013 with the latest Qt and the VS Qt Add-in. I've also set the project to support QML in "Qt Project Settings".
The .qss file looks like this (it works if set directly as a QString). I'm not sure if the "import" line is needed:
import Qt 5.3.1
QDialog
{
background-color: 'white';
}
It is reading it fine, but the style is not applying. Here it is in debug mode:
QDialog does not support "background-color", only "backgroud:".
(Further ideas if that doesnt work:
Maybe forgot to specify Q_OBJECT for newGameDialog class?
Alternatively use Qt Designer to create a QDialog, copy your stylesheet source in the stylesheet property field and see if it works or if the designer shows an error or does apply the style correctly when test-instanciating the dialog (Ctrl+R i think).)

Qt qrc resource file - can't load icon

I have a Qt5 desktop project and I added a "resource.qrc" file with the Qt Creator editor which created the following line into the project's .pro file:
RESOURCES = resource.qrc
I put a blank prefix and a png file (14x14) and I tried to use it like this:
QPixmap pixmap = QPixmap ("://my_image.png");
ui->combobox->addItem(QIcon(pixmap), "itemname");
The problem is: the icon won't show up!
The following works:
QPixmap pixmap(14,14);
pixmap.fill(QColor("red"));
ui->combobox->addItem(QIcon(pixmap), "itemname");
so the problem must be in the resource embedding process.. I noticed that the generated "exe" hasn't a resource section inside it... I don't have static linked external libraries, so I don't think I need the Q_INIT_RESOURCE(resource) macro (it gives me undefined external)
Update:
I'm posting here my qrc file:
<RCC>
<qresource prefix="/">
<file>my_image.png</file>
</qresource>
</RCC>
it's pretty simple and I don't understand why at runtime icons are not showing up
I had this same issue recently, where I malformed the resource string. If you are using a current version of Qt Creator, you can open your .qrc file for edit and then right-click the resource (in this case image) that you are trying to address, then click "Copy Resource Path to Clipboard". And voila, you have the correct resource string every time.
Qt Creator is awesome.
Hope this helps!
#Nikos C. gives you useful advice, but I think your main problem was that you didn't use the correct link to the resource.
In your code, you have:
QPixmap pixmap = QPixmap ("://my_image.png");
but, according to the documentation, it should be
QPixmap pixmap = QPixmap (":/my_image.png");
or you can give aliases to your resources, and use those instead.
Issue is solved is use rcc.exe
C:\root\QT>c:\root\QT\4.7.4\bin\rcc.exe Headless.qrc -o qtresources.cpp
During compilation you should have images in the path.
Create the qtresources.cpp file include this file in makefile or project. You should able to see the image.