Qml is not a type error - Исправление ошибок и поиск оптимальных решений проблем

I have a large project (A) which is impractical to share. I am not getting an «XXX is not a type» and I do not understand why. I am using qmake and Qt Creator. Assuming they exist, what are ways to view detailed logs or other things to help me understand how components are being found? I would like to understand why this project is working.

The reason why this is important to me is related to the branch on the sample repo https://github.com/jh3010-qt-questions/qml_location/tree/not_working, which is not working, but appears to match what the referenced project above is doing (or not doing).

On the *_solution branches in the repo, I have implemented various solutions which all resolve the problem.

However, as best as I can determine, none of implemented solutions are what (A) is doing. Loader is not be used. .createObject is not used. There do not appear to be any imports. A qmldir is not being used. And, yet, (A) works.

What are other solutions for qml_location that have not been used?

It is possible I am glazing over what (A) is doing and will keep staring at it.

On the not_working branch, I get a «MyDeepComponent is not a type» error.

main.qml

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window 
{
  width:   640
  height:  480
  visible: true

  title: qsTr( "Hello World" )

  Column
  {
    MyDeepComponent
    {
    }
  }
}

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
  QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

  QGuiApplication app(argc, argv);

  QQmlApplicationEngine engine;

  engine.addImportPath( "qrc:/qml" );

  const QUrl url(QStringLiteral("qrc:/main.qml"));

  QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                   &app, [url](QObject *obj, const QUrl &objUrl) {
    if (!obj && url == objUrl)
      QCoreApplication::exit(-1);
  }, Qt::QueuedConnection);
  engine.load(url);

  return app.exec();
}

qml.qrc

<RCC>
    <qresource prefix="/">
        <file>main.qml</file>
        <file>qml/MyDeepComponent.qml</file>
        <file>qml/MyDeepComponentForm.ui.qml</file>
        <file>qml/more/MyDeeperComponent.qml</file>
        <file>qml/more/MyDeeperComponentForm.ui.qml</file>
    </qresource>
</RCC>

qml_location.pro

QT += quick

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
        main.cpp

RESOURCES += qml.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

MyDeepComponentForm.ui.qml

import QtQuick 2.4

Rectangle {
  width: 40
  height: 40

  color: "red"
}

MyDeepComponent.qml

import QtQuick 2.4

MyDeepComponentForm {
}

The directory structure is:

$ tree qml_location
qml_location/
├── main.cpp
├── main.qml
├── qml
│   ├── MyDeepComponent.qml
│   ├── MyDeepComponentForm.ui.qml
│   └── more
│       ├── MyDeeperComponent.qml
│       └── MyDeeperComponentForm.ui.qml
├── qml.qrc
├── qml_location.pro
└── qml_location.pro.user

Источник

Todd

Hi all, new to using Qt creator/V-play so bare with me please….

So I am trying to make a unlimited running platformer, like flappy bird. I am actually using a V-play template to make this game.

I am trying to add bombs into the space that continue to randomly run onto the screen and you must avoid them with your plane.

I keep getting a type error message when i attempt to put the bomb into the scene, here is the code
(Level.qml)
import Felgo 3.0
import QtQuick 2.0
import “../entities”
import “../common”

Item {
id: level

Background {
anchors.horizontalCenter: parent.horizontalCenter
y: scene.gameWindowAnchorItem.y+scene.gameWindowAnchorItem.height-height
}

BorderElement {
x: scene.gameWindowAnchorItem.x
y: scene.gameWindowAnchorItem.y-20
width: scene.gameWindowAnchorItem.width
height: 20
}

BorderElement {
y: ground.y
x: scene.gameWindowAnchorItem.x
width: scene.gameWindowAnchorItem.width
height: 20
}

Bombs {
id: bombs1
delay: 0
}

Bombs {
id: bombs2
delay: 1.5
}

Ground {
id: ground
anchors.horizontalCenter: parent.horizontalCenter
y: scene.gameWindowAnchorItem.y+scene.gameWindowAnchorItem.height-height
}

function reset() {
bombs1.reset()
bombs2.reset()
ground.reset()
}

function stop() {
bombs1.stop()
bombs2.stop()
ground.stop()
}

function start() {
bombs1.start()
bombs2.start()
}
}
(bomb.qml)
import Felgo 3.0
import QtQuick 2.0

EntityBase {
id: bombElement
width: 40
height: 40
property int variationDistance: 70
property double delay: 0

MultiResolutionImage {
id: bomb
source: “../../assets/img/bomb.png”

}

BoxCollider {
id: collider
width: bomb.width
height: bomb.height
anchors.centerIn: bomb
bodyType: Body.Static
collisionTestingOnlyMode: true
fixture.onBeginContact: {
player.gameOver()
}
}

MovementAnimation {
id: animation
target: parent
property: “x”
velocity: -150
running: true
minPropertyValue: scene.gameWindowAnchorItem.x-bombElement.width*1.5
onLimitReached: {
reset()
}
}

function generateRandomValueBetween(minimum, maximum) {
return Math.random()*(maximum-minimum) + minimum
}

function reset() {
bombElement.x = scene.gameWindowAnchorItem.width+bombElement.width/2
bombElement.y = generateRandomValueBetween(-variationDistance, variationDistance)-scene.height/3
}

function start() {
delayTimer.restart()
}

function stop() {
animation.stop()
delayTimer.stop()
}

Timer {
id: delayTimer
interval: delay*1000
repeat: false
onTriggered: {
animation.start()
}
}

Component.onCompleted: {
reset()
}
}

These are the error messages.
file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/MainItem.qml:46:5: Type GameScene unavailable
file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/scenes/GameScene.qml:37:5: Type Level unavailable
file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/game/Level.qml:28:5: Bombs is not a type
C:UserstoddOneDriveCompanybuild-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-DebugdebugGoPlane.exe exited with code 0

Alex

Felgo Team

Hi,

your bomb qml file is named Bomb.qml (or is it bomb.qml with lowercase, doesn’t really matter), WITHOUT an s. The name of the qml file equals the classname of that component when used. so in your code it must be

Bomb {
  // ...
}

and not

Bombs {
  // ...
}

That’s why it says Bombs is not a type, because the type you defined is Bomb instead.

Cheers,
Alex

Todd

Hey Alex, thanks for the quick response.

So I went in an updated accordingly, and I still get the same error message.

it is bomb.qml with a lowercase by the way.

Günther

Felgo Team

Hi Todd!

It’s best practice that types in QML start with an uppercase-letter, so I’d recommend using Bomb.qml as the name and use Bomb as type name in your QML code. The type name always matches the filename. One thing that might also be relevant, is that you import the folder where the QML file is placed so you can access the types.

Can you try again uppercase letter?

Best,
Günther

Todd

Hey Gunther,

I went in and updated the QML file with an uppercase B, its now Bomb.qml.

Im getting these errors

file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/MainItem.qml:46:5: Type GameScene unavailable

file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/scenes/GameScene.qml:37:5: Type Level unavailable

file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/game/Level.qml:28:5: Type Bomb unavailable

file:///C:/Users/todd/OneDrive/Company/build-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-Debug/qml/entities/Bomb.qml: File name case mismatch

C:UserstoddOneDriveCompanybuild-GoPlane-Desktop_Qt_5_7_0_MinGW_32bit-DebugdebugGoPlane.exe exited with code 0

Günther

Felgo Team

Hi Todd,
it should be okay if both the file and the typename you use starts with an uppercase.
Please try to solve the error by making sure you get a fresh and clean build:
– Delete the build directory
– Open your project in Qt Creator
– Right-click the project in the Project Explorer and select “Clean”
– Right-click again and select “Run qmake”
– Build the project

Does it work now?

Todd

This might sound like a dumb question but when you say delete the build directory do you mean go into the actual file explorer and delete the project or is that something you do directly in qt creator?

Günther

Felgo Team

The build directory is created additionally to the project directory, usually as a neighbour directory of the project.
In the Qt Creator “Projects” tab, you can view or change the build directory for each build kit. The build directory also contains files from previous builds, because this allows to speed up the build process as e.g. only new or changed files will be rebuilt. You can safely delete this build folder from your file system, as it will be created again with the next build.

One other thing that might be relevant, is that for type or auto-completion issues, it can help to restart Qt Creator and reopen the project e.g. when you change a type-name, as Qt Creator then reloads all types and autocompletion data.

Best,
Günther

Todd

Hey again Gunther…

So I went in and deleted the files and re built/cleaned them.

I still continue to get these errors:

qt.network.ssl: QSslSocket: cannot resolve TLSv1_1_client_method

qt.network.ssl: QSslSocket: cannot resolve TLSv1_2_client_method

qt.network.ssl: QSslSocket: cannot resolve TLSv1_1_server_method

qt.network.ssl: QSslSocket: cannot resolve TLSv1_2_server_method

qt.network.ssl: QSslSocket: cannot resolve SSL_select_next_proto

qt.network.ssl: QSslSocket: cannot resolve SSL_CTX_set_next_proto_select_cb

qt.network.ssl: QSslSocket: cannot resolve SSL_get0_next_proto_negotiated

qt.network.ssl: QSslSocket: cannot call unresolved function SSL_get0_next_proto_negotiated

file:///C:/Users/todd/OneDrive/Company/qml/MainItem.qml:46:3: Type GameScene unavailable

file:///C:/Users/todd/OneDrive/Company/qml/scenes/GameScene.qml:37:3: Type Level unavailable

file:///C:/Users/todd/OneDrive/Company/qml/game/Level.qml:28:3: Bombs is not a type

C:UserstoddOneDriveCompanyreleaseFlappyBird.exe exited with code 0

Is it something with my code?

Todd

And by the way I was working on this on both my desktop and laptop via onedrive, I dont see why it would be a problem but just thought I’d mention it.

Alex

Felgo Team

file:///C:/Users/todd/OneDrive/Company/qml/game/Level.qml:28:3: Bombs is not a type

Again you are obviously using “Bombs” in your code while your qml files are named “Bomb“

Todd

Alex,

I set it back to bomb but now I get these