Added support for c++ to main entry point.

Closes #13

samples/hosting/.gitignore

@@ -0,0 +1,6 @@
+build-*/
+*.pro.user
+net-output/
+net/.idea/
+net/obj/
+net/.vs/

samples/hosting/native/NativeHost.pro

@@ -0,0 +1,13 @@
+QT += quick
+CONFIG += c++11
+
+DEFINES += QT_DEPRECATED_WARNINGS
+
+SOURCES += \
+        main.cpp
+
+RESOURCES += qml.qrc
+
+DEFINES += "NET_ROOT=\"\\\"$$PWD/../net-output\\\"\""
+
+include (../../../src/native/QmlNet/Hosting.pri)

samples/hosting/native/Page1Form.ui.qml

@@ -0,0 +1,18 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+Page {
+    width: 600
+    height: 400
+
+    header: Label {
+        text: qsTr("Page 1")
+        font.pixelSize: Qt.application.font.pixelSize * 2
+        padding: 10
+    }
+
+    Label {
+        text: qsTr("You are on Page 1.")
+        anchors.centerIn: parent
+    }
+}

samples/hosting/native/Page2Form.ui.qml

@@ -0,0 +1,18 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+Page {
+    width: 600
+    height: 400
+
+    header: Label {
+        text: qsTr("Page 2")
+        font.pixelSize: Qt.application.font.pixelSize * 2
+        padding: 10
+    }
+
+    Label {
+        text: qsTr("You are on Page 2.")
+        anchors.centerIn: parent
+    }
+}

samples/hosting/native/main.cpp

@@ -0,0 +1,40 @@
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <Hosting/CoreHost.h>
+#include <QDebug>
+#include <QFileInfo>
+#include <QDir>
+
+static int runCallback(QGuiApplication* app, QQmlApplicationEngine* engine)
+{
+    engine->load(QUrl(QStringLiteral("qrc:/main.qml")));
+    if (engine->rootObjects().isEmpty())
+        return -1;
+
+    return app->exec();
+}
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+
+    QString netDll = NET_ROOT;
+    netDll.append(QDir::separator());
+    netDll.append("NetHost.dll");
+
+    CoreHost::RunContext runContext;
+    runContext.hostFxrContext = CoreHost::findHostFxr();
+    runContext.managedExe = netDll;
+    // NOTE: You may set entry point to the current executable if
+    // the .NET runtime is deployed side-by-side.
+    runContext.entryPoint = runContext.hostFxrContext.dotnetRoot;
+    runContext.entryPoint.append(CORECLR_DOTNET_EXE_NAME);
+
+    return CoreHost::run(app,
+        engine,
+        runCallback,
+        runContext);
+}

samples/hosting/native/main.qml

@@ -0,0 +1,49 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+import test 1.0
+
+ApplicationWindow {
+    visible: true
+    width: 640
+    height: 480
+    title: qsTr("Tabs")
+
+    SwipeView {
+        id: swipeView
+        anchors.fill: parent
+        currentIndex: tabBar.currentIndex
+
+        Page1Form {
+        }
+
+        Page2Form {
+        }
+    }
+
+    footer: TabBar {
+        id: tabBar
+        currentIndex: swipeView.currentIndex
+
+        TabButton {
+            text: qsTr("Page 1")
+        }
+        TabButton {
+            text: qsTr("Page 2")
+        }
+    }
+
+    Timer {
+        interval: 500; running: true; repeat: true
+        onTriggered: {
+            test.testMethod()
+        }
+    }
+
+    TestObject {
+        id: test
+        Component.onCompleted: {
+            // Call .NET
+            test.testMethod()
+        }
+    }
+}

samples/hosting/native/qml.qrc

@@ -0,0 +1,9 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+        <file>Page1Form.ui.qml</file>
+        <file>Page2Form.ui.qml</file>
+        <file>main.qml</file>
+        <file>qtquickcontrols2.conf</file>
+    </qresource>
+</RCC>

samples/hosting/native/qtquickcontrols2.conf

@@ -0,0 +1,6 @@
+; This file can be edited to change the style of the application
+; Read "Qt Quick Controls 2 Configuration File" for details:
+; http://doc.qt.io/qt-5/qtquickcontrols2-configuration.html
+
+[Controls]
+Style=Default

samples/hosting/net/NetHost.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <OutDir>$(MSBuildProjectDirectory)/../net-output</OutDir>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\src\net\Qml.Net\Qml.Net.csproj" />
+  </ItemGroup>
+
+</Project>

samples/hosting/net/NetHost.sln

@@ -0,0 +1,48 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26124.0
+MinimumVisualStudioVersion = 15.0.26124.0
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NetHost", "NetHost.csproj", "{A787B77B-F87B-44A1-AD3D-38E21A92A84A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Qml.Net", "..\..\..\src\net\Qml.Net\Qml.Net.csproj", "{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Debug|x64.Build.0 = Debug|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Debug|x86.Build.0 = Debug|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Release|x64.ActiveCfg = Release|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Release|x64.Build.0 = Release|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Release|x86.ActiveCfg = Release|Any CPU
+		{A787B77B-F87B-44A1-AD3D-38E21A92A84A}.Release|x86.Build.0 = Release|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Debug|x64.Build.0 = Debug|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Debug|x86.Build.0 = Debug|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Release|x64.ActiveCfg = Release|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Release|x64.Build.0 = Release|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Release|x86.ActiveCfg = Release|Any CPU
+		{7258C1D8-8508-4ED9-8F89-5AE2EAEBED9D}.Release|x86.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

samples/hosting/net/Program.cs

@@ -0,0 +1,25 @@
+using System;
+using Qml.Net;
+
+namespace NetHost
+{
+    class Program
+    {
+        public class TestObject
+        {
+            public void TestMethod()
+            {
+                Console.WriteLine("test method");
+            }
+        }
+
+        static int Main(string[] _)
+        {
+            return Host.Run(_, (args, app, engine, runCallback) =>
+            {
+                QQmlApplicationEngine.RegisterType<TestObject>("test");
+                return runCallback();
+            });
+        }
+    }
+}

src/native/QmlNet/Hosting.pri

@@ -0,0 +1,12 @@
+INCLUDEPATH += $$PWD
+
+HEADERS += $$PWD/Hosting/coreclrhost.h \
+    $$PWD/Hosting/CoreHost.h
+
+SOURCES += \
+    $$PWD/Hosting/CoreHost.cpp
+
+unix {
+    LIBS += -ldl
+}
+

src/native/QmlNet/Hosting/CoreHost.cpp

@@ -0,0 +1,200 @@
+#include <Hosting/CoreHost.h>
+#include <Hosting/coreclrhost.h>
+#include <QFileInfo>
+#include <QDir>
+#include <QDirIterator>
+#include <QVersionNumber>
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+#ifdef __APPLE__
+#define HOSTFXR_DLL_NAME "libhostfxr.dylib"
+#elif _WIN32
+#define HOSTFXR_DLL_NAME "hostfxr.dll"
+#else
+#define HOSTFXR_DLL_NAME "libhostfxr.so"
+#endif
+
+QList<QString> CoreHost::getPotientialDotnetRoots()
+{
+    QList<QString> result;
+#ifdef _WIN32
+    result.push_back("C:\\Program Files\\dotnet");
+#else
+    result.push_back("/usr/local/share/dotnet");
+    result.push_back("/usr/share/dotnet");
+    result.push_back("/opt/dotnet");
+#endif
+
+    QByteArray dotnetRoot = qgetenv("DOTNET_ROOT");
+    if(!dotnetRoot.isEmpty()) {
+        // We are overriding the roots, forcing ourselves to look in a particular spot.
+        result.clear();
+        result.push_back(dotnetRoot);
+    }
+
+    return result;
+}
+
+CoreHost::HostFxrContext CoreHost::findHostFxr()
+{
+    HostFxrContext result;
+    result.success = false;
+
+    QList<QString> roots = getPotientialDotnetRoots();
+
+    for(QString root : roots) {
+        qDebug("looking for %s in root %s", HOSTFXR_DLL_NAME, qPrintable(root));
+        if(!root.endsWith(QDir::separator())) {
+            root.append(QDir::separator());
+        }
+
+        QFileInfo rootInfo(root);
+        if(!rootInfo.exists()) {
+            qDebug("%s doesn't exist", qPrintable(rootInfo.path()));
+            continue;
+        }
+
+        QString host = root;
+        host.append("host");
+        host.append(QDir::separator());
+        QFileInfo hostInfo(host);
+        if(!hostInfo.exists()) {
+            qDebug("%s doesn't exist", qPrintable(host));
+            continue;
+        }
+
+        QString fxr = host;
+        fxr.append("fxr");
+        fxr.append(QDir::separator());
+        QFileInfo fxrInfo(fxr);
+        if(!fxrInfo.exists()) {
+            qDebug("%s doesn't exist.", qPrintable(fxr));
+            continue;
+        }
+
+        QString currentFxrLib;
+        QVersionNumber currentFxrLibVersion;
+
+        QDir fxrDir = fxrInfo.dir();
+        fxrDir.setFilter(QDir::Dirs | QDir::NoDot | QDir::NoDotDot);
+        QDirIterator it(fxrDir, QDirIterator::Subdirectories);
+        while(it.hasNext()) {
+            QString fxrVersion = it.next();
+            QFileInfo fxrVersionInfo(fxrVersion);
+
+            fxrVersion.append(QDir::separator());
+            fxrVersion.append(HOSTFXR_DLL_NAME);
+
+            QFileInfo fxrLibInfo(fxrVersion);
+            if(!fxrLibInfo.exists()) {
+                qDebug("%s doesn't exist", qPrintable(fxrLibInfo.absoluteFilePath()));
+                continue;
+            }
+
+            QVersionNumber version = QVersionNumber::fromString(fxrVersionInfo.fileName());
+            if(currentFxrLibVersion.isNull() || version > currentFxrLibVersion) {
+                qDebug("found potentional file %s with version %s", qPrintable(fxrLibInfo.absoluteFilePath()), qPrintable((version.toString())));
+                currentFxrLibVersion = version;
+                currentFxrLib = fxrLibInfo.absoluteFilePath();
+            } else {
+                qDebug("ignore file %s with version %s", qPrintable(fxrLibInfo.absoluteFilePath()), qPrintable((version.toString())));
+            }
+        }
+
+        if(!currentFxrLib.isEmpty()) {
+            qDebug("returning hostfx lib: %s", qPrintable(currentFxrLib));
+            result.success = true;
+            result.hostFxrLib = currentFxrLib;
+            result.dotnetRoot = root;
+            return result;
+        }
+    }
+
+    return result;
+}
+
+int CoreHost::run(QGuiApplication& app, QQmlApplicationEngine& engine, runCallback runCallback, RunContext runContext)
+{
+    QList<QString> execArgs;
+    execArgs.push_back(runContext.entryPoint);
+    execArgs.push_back("exec");
+    execArgs.push_back(runContext.managedExe);
+
+    QString appPtr;
+    appPtr.sprintf("%llu", (quintptr)&app);
+    QString enginePtr;
+    enginePtr.sprintf("%llu", (quintptr)&engine);
+    QString callbackPtr;
+    callbackPtr.sprintf("%llu", (quintptr)runCallback);
+
+    execArgs.push_back(appPtr);
+    execArgs.push_back(enginePtr);
+    execArgs.push_back(callbackPtr);
+
+    for (QString arg : runContext.args) {
+        execArgs.push_back(arg);
+    }
+
+    std::vector<const CORECLR_CHAR_TYPE*> hostFxrArgs;
+
+#ifdef _WIN32
+
+    for (QString arg : execArgs) {
+        hostFxrArgs.push_back(arg.utf16());
+    }
+
+#else
+
+    QList<QByteArray> execArgs8bit;
+    for (QString arg : execArgs) {
+        execArgs8bit.push_back(arg.toLocal8Bit());
+    }
+    for (QByteArray arg : execArgs8bit) {
+        hostFxrArgs.push_back(arg);
+    }
+
+#endif
+
+    hostfxr_main_ptr hostfxr_main = nullptr;
+
+#ifdef _WIN32
+
+    HMODULE dll = LoadLibraryA(qPrintable(runContext.hostFxrContext.hostFxrLib));
+    if(dll == nullptr) {
+        qCritical("Couldn't load lib at %s", qPrintable(runContext.hostFxrContext.hostFxrLib));
+        return LoadHostFxrResult::Failed;
+    }
+
+    hostfxr_main = reinterpret_cast<hostfxr_main_ptr>(GetProcAddress(dll, "hostfxr_main"));
+
+#else
+
+    void* dll = dlopen(qPrintable(runContext.hostFxrContext.hostFxrLib), RTLD_NOW | RTLD_LOCAL);
+    if(dll == nullptr) {
+        qCritical("Couldn't load lib at %s", qPrintable(runContext.hostFxrContext.hostFxrLib));
+        return LoadHostFxrResult::Failed;
+    }
+
+    hostfxr_main = reinterpret_cast<hostfxr_main_ptr>(dlsym(dll, "hostfxr_main"));
+
+#endif
+
+    if(hostfxr_main == nullptr) {
+        qCritical("Couldn't load 'hostfxr_main' from %s", qPrintable(runContext.hostFxrContext.hostFxrLib));
+        return -1;
+    }
+
+    int result = hostfxr_main(static_cast<int>(hostFxrArgs.size()), &hostFxrArgs[0]);
+
+#ifdef _WIN32
+    FreeLibrary(dll);
+#else
+    dlclose(dll);
+#endif
+
+    return result;
+}

src/native/QmlNet/Hosting/CoreHost.h

@@ -0,0 +1,44 @@
+#ifndef COREHOST_H
+#define COREHOST_H
+
+#include <QSharedPointer>
+#include <Hosting/coreclrhost.h>
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+
+#ifdef _WIN32
+#define CORECLR_DOTNET_EXE_NAME "dotnet.exe"
+#else
+#define CORECLR_DOTNET_EXE_NAME "dotnet"
+#endif
+
+class CoreHost : public QObject
+{
+    Q_OBJECT
+public:
+    struct HostFxrContext {
+        bool success;
+        QString dotnetRoot;
+        QString hostFxrLib;
+    };
+    struct RunContext {
+        HostFxrContext hostFxrContext;
+        QString entryPoint;
+        QString managedExe;
+        QList<QString> args;
+    };
+
+    enum LoadHostFxrResult
+    {
+        Loaded,
+        AlreadyLoaded,
+        Failed
+    };
+    typedef int (*runCallback)(QGuiApplication* app, QQmlApplicationEngine* engine);
+
+    static QList<QString> getPotientialDotnetRoots();
+    static HostFxrContext findHostFxr();
+    static int run(QGuiApplication& app, QQmlApplicationEngine& engine, runCallback runCallback, RunContext runContext);
+};
+
+#endif

src/native/QmlNet/Hosting/coreclrhost.h

@@ -0,0 +1,80 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+//
+// APIs for hosting CoreCLR
+//
+
+#ifndef CORECLR_HOST_H
+#define CORECLR_HOST_H
+
+#ifdef _WIN32
+typedef unsigned short CORECLR_CHAR_TYPE;
+#else
+typedef char CORECLR_CHAR_TYPE;
+#endif
+
+// For each hosting API, we define a function prototype and a function pointer
+// The prototype is useful for implicit linking against the dynamic coreclr
+// library and the pointer for explicit dynamic loading (dlopen, LoadLibrary)
+#define CORECLR_HOSTING_API(function, ...) \
+    extern "C" int function(__VA_ARGS__); \
+    typedef int (*function##_ptr)(__VA_ARGS__)
+
+CORECLR_HOSTING_API(coreclr_initialize,
+            const char* exePath,
+            const char* appDomainFriendlyName,
+            int propertyCount,
+            const char** propertyKeys,
+            const char** propertyValues,
+            void** hostHandle,
+            unsigned int* domainId);
+
+CORECLR_HOSTING_API(coreclr_shutdown,
+            void* hostHandle,
+            unsigned int domainId);
+
+CORECLR_HOSTING_API(coreclr_shutdown_2,
+            void* hostHandle,
+            unsigned int domainId,
+            int* latchedExitCode);
+
+CORECLR_HOSTING_API(coreclr_create_delegate,
+            void* hostHandle,
+            unsigned int domainId,
+            const char* entryPointAssemblyName,
+            const char* entryPointTypeName,
+            const char* entryPointMethodName,
+            void** delegate);
+
+CORECLR_HOSTING_API(coreclr_execute_assembly,
+            void* hostHandle,
+            unsigned int domainId,
+            int argc,
+            const char** argv,
+            const char* managedAssemblyPath,
+            unsigned int* exitCode);
+
+// hostfxr
+CORECLR_HOSTING_API(hostfxr_get_native_search_directories,
+            const int argc,
+            const char* argv[],
+            char buffer[],
+            int buffer_size,
+            int* required_buffer_size);
+
+CORECLR_HOSTING_API(hostfxr_main_startupinfo,
+            const int argc,
+            const char* argv[],
+            const char* host_path,
+            const char* dotnet_root,
+            const char* app_path);
+
+CORECLR_HOSTING_API(hostfxr_main,
+            const int argc,
+            const CORECLR_CHAR_TYPE* argv[]);
+
+#undef CORECLR_HOSTING_API
+                      
+#endif // CORECLR_HOST_H

src/native/QmlNet/QmlNet/qml/NetTestHelper.cpp

@@ -5,7 +5,7 @@
 extern "C" {
 
 Q_DECL_EXPORT void net_test_helper_runQml(QQmlApplicationEngineContainer* qmlEngineContainer, LPWSTR qml) {
-    QQmlComponent component(qmlEngineContainer->qmlEngine.data());
+    QQmlComponent component(qmlEngineContainer->qmlEngine);
     QString qmlString = QString::fromUtf16((const char16_t*)qml);
     component.setData(qmlString.toUtf8(), QUrl());
     QObject *object = component.create();

src/native/QmlNet/QmlNet/qml/QGuiApplication.cpp

@@ -14,27 +14,32 @@ void GuiThreadContextTriggerCallback::trigger() {
 
 extern "C" {
 
-Q_DECL_EXPORT QGuiApplicationContainer* qguiapplication_create(NetVariantListContainer* argsContainer) {
-
+Q_DECL_EXPORT QGuiApplicationContainer* qguiapplication_create(NetVariantListContainer* argsContainer, QGuiApplication* existingApp) {
     QGuiApplicationContainer* result = new QGuiApplicationContainer();
 
-    // Build our args
-    if(argsContainer != nullptr) {
-        QSharedPointer<NetVariantList> args = argsContainer->list;
-        for(int x = 0; x < args->count(); x++) {
-            QByteArray arg = args->get(x)->getString().toLatin1();
-            result->args.append(arg);
-            char* cstr = nullptr;
-            cstr = new char [arg.size()+1];
-            strcpy(cstr, arg.data());
-            result->argsPointer.push_back(cstr);
-        }
-        result->argCount = result->args.size();
+    if (existingApp != nullptr) {
+        result->ownsGuiApp = false;
+        result->guiApp = existingApp;
     } else {
-        result->argCount = 0;
+        result->ownsGuiApp = true;
+        // Build our args
+        if(argsContainer != nullptr) {
+            QSharedPointer<NetVariantList> args = argsContainer->list;
+            for(int x = 0; x < args->count(); x++) {
+                QByteArray arg = args->get(x)->getString().toLatin1();
+                result->args.append(arg);
+                char* cstr = nullptr;
+                cstr = new char [arg.size()+1];
+                strcpy(cstr, arg.data());
+                result->argsPointer.push_back(cstr);
+            }
+            result->argCount = result->args.size();
+        } else {
+            result->argCount = 0;
+        }
+        result->guiApp = new QGuiApplication(result->argCount, &result->argsPointer[0], 0);
     }
 
-    result->guiApp = QSharedPointer<QGuiApplication>(new QGuiApplication(result->argCount, &result->argsPointer[0], 0));
     result->callback = QSharedPointer<GuiThreadContextTriggerCallback>(new GuiThreadContextTriggerCallback());
 
     return result;
@@ -44,6 +49,10 @@ Q_DECL_EXPORT void qguiapplication_destroy(QGuiApplicationContainer* container)
     for (auto i : container->argsPointer) {
         delete i;
     }
+    container->callback.clear();
+    if(container->ownsGuiApp) {
+        delete container->guiApp;
+    }
     delete container;
 }
 
@@ -63,4 +72,8 @@ Q_DECL_EXPORT void qguiapplication_exit(QGuiApplicationContainer* container, int
     container->guiApp->exit(returnCode);
 }
 
+Q_DECL_EXPORT QGuiApplication* qguiapplication_internalPointer(QGuiApplicationContainer* container) {
+    return container->guiApp;
+}
+
 }

src/native/QmlNet/QmlNet/qml/QGuiApplication.h

@@ -20,7 +20,8 @@ struct QGuiApplicationContainer {
     int argCount;
     QList<QString> args;
     std::vector<char*> argsPointer;
-    QSharedPointer<QGuiApplication> guiApp;
+    QGuiApplication* guiApp;
+    bool ownsGuiApp;
     QSharedPointer<GuiThreadContextTriggerCallback> callback;
 };
 

src/native/QmlNet/QmlNet/qml/QQmlApplicationEngine.cpp

@@ -12,19 +12,34 @@ static int netValueTypeNumber = 0;
 
 extern "C" {
 
-Q_DECL_EXPORT QQmlApplicationEngineContainer* qqmlapplicationengine_create() {
-    QSharedPointer<QQmlApplicationEngine> qmlEngine = QSharedPointer<QQmlApplicationEngine>(new QQmlApplicationEngine());
+Q_DECL_EXPORT QQmlApplicationEngineContainer* qqmlapplicationengine_create(QQmlApplicationEngine* existingEngine) {
+    bool ownsEngine = true;
+    QQmlApplicationEngine* engine = nullptr;
 
-    QV4::ExecutionEngine* v4Engine = QQmlEnginePrivate::getV4Engine(qmlEngine.data());
+    if (existingEngine != nullptr) {
+        engine = existingEngine;
+        ownsEngine = false;
+    } else {
+        engine = new QQmlApplicationEngine();
+        ownsEngine = true;
+    }
+
+    QV4::ExecutionEngine* v4Engine = QQmlEnginePrivate::getV4Engine(engine);
 
     QV4::Scope scope(v4Engine);
     QV4::ScopedObject net(scope, v4Engine->memoryManager->allocObject<QV4::NetObject>());
     v4Engine->globalObject->defineDefaultProperty("Net", net);;
 
-    return new QQmlApplicationEngineContainer{qmlEngine};
+    return new QQmlApplicationEngineContainer{
+        engine,
+        ownsEngine
+    };
 }
 
 Q_DECL_EXPORT void qqmlapplicationengine_destroy(QQmlApplicationEngineContainer* container) {
+    if(container->ownsEngine) {
+        delete container->qmlEngine;
+    }
     delete container;
 }
 
@@ -179,4 +194,8 @@ Q_DECL_EXPORT void qqmlapplicationengine_addImportPath(QQmlApplicationEngineCont
     container->qmlEngine->addImportPath(pathString);
 }
 
+Q_DECL_EXPORT QQmlApplicationEngine* qqmlapplicationengine_internalPointer(QQmlApplicationEngineContainer* container) {
+    return container->qmlEngine;
+}
+
 }

src/native/QmlNet/QmlNet/qml/QQmlApplicationEngine.h

@@ -3,10 +3,10 @@
 
 #include <QmlNet.h>
 #include <QQmlApplicationEngine>
-#include <QSharedPointer>
 
 struct QQmlApplicationEngineContainer {
-    QSharedPointer<QQmlApplicationEngine> qmlEngine;
+    QQmlApplicationEngine* qmlEngine;
+    bool ownsEngine;
 };
 
 #endif // NET_QQMLAPPLICATIONENGINE_H

src/net/Qml.Net/Host.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Linq;
+using System.Runtime.InteropServices;
+
+namespace Qml.Net
+{
+    public static class Host
+    {
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        public delegate int NativeRunCallbackDelegate(IntPtr app, IntPtr engine);
+
+        public delegate int NetRunCallbackDelegate();
+        
+        public static int Run(string[] args, Func<string[], QGuiApplication, QQmlApplicationEngine, NetRunCallbackDelegate, int> action)
+        {
+            if (args.Length < 3)
+            {
+                throw new Exception("Args is invalid, must contain three entries which are pointers to native types.");
+            }
+            
+            var appPtr = new IntPtr((long)ulong.Parse(args[0]));
+            var enginePtr = new IntPtr((long)ulong.Parse(args[1]));
+            var callbackPtr = new IntPtr((long)ulong.Parse(args[2]));
+
+            using (var app = new QGuiApplication(appPtr))
+            {
+                using (var engine = new QQmlApplicationEngine(enginePtr))
+                {
+                    var runCallback = new NetRunCallbackDelegate(() =>
+                    {
+                        var callback = Marshal.GetDelegateForFunctionPointer<NativeRunCallbackDelegate>(callbackPtr);
+                        // ReSharper disable AccessToDisposedClosure
+                        return callback.Invoke(app.InternalPointer, engine.InternalPointer);
+                        // ReSharper restore AccessToDisposedClosure
+                    });
+                    return action(args.Skip(2).ToArray(), app, engine, runCallback);
+                }
+            }
+        }
+    }
+}

src/net/Qml.Net/QGuiApplication.cs

@@ -33,6 +33,18 @@ namespace Qml.Net
             SynchronizationContext.SetSynchronizationContext(new QtSynchronizationContext(this));
         }
 
+        internal QGuiApplication(IntPtr existingApp)
+            :base(CreateFromExisting(existingApp))
+        {
+            TriggerDelegate triggerDelegate = Trigger;
+            _triggerHandle = GCHandle.Alloc(triggerDelegate);
+            
+            Interop.QGuiApplication.AddTriggerCallback(Handle, Marshal.GetFunctionPointerForDelegate(triggerDelegate));
+            
+            _oldSynchronizationContext = SynchronizationContext.Current;
+            SynchronizationContext.SetSynchronizationContext(new QtSynchronizationContext(this));
+        }
+
         public int Exec()
         {
             return Interop.QGuiApplication.Exec(Handle);
@@ -62,6 +74,8 @@ namespace Qml.Net
             Interop.QGuiApplication.RequestTrigger(Handle);
         }
 
+        internal IntPtr InternalPointer => Interop.QGuiApplication.InternalPointer(Handle);
+
         private void Trigger()
         {
             Action action;
@@ -79,6 +93,11 @@ namespace Qml.Net
             _triggerHandle.Free();
         }
 
+        private static IntPtr CreateFromExisting(IntPtr app)
+        {
+            return Interop.QGuiApplication.Create(IntPtr.Zero, app);
+        }
+
         private static IntPtr Create(List<string> args)
         {
             if (args == null)
@@ -101,7 +120,7 @@ namespace Qml.Net
                         strings.Add(variant);
                     }
                 }
-                return Interop.QGuiApplication.Create(strings.Handle);
+                return Interop.QGuiApplication.Create(strings.Handle, IntPtr.Zero);
             }
         }
 
@@ -127,7 +146,7 @@ namespace Qml.Net
     internal interface IQGuiApplicationInterop
     {
         [NativeSymbol(Entrypoint = "qguiapplication_create")]
-        IntPtr Create(IntPtr args);
+        IntPtr Create(IntPtr args, IntPtr existingApp);
         [NativeSymbol(Entrypoint = "qguiapplication_destroy")]
         void Destroy(IntPtr app);
 
@@ -139,5 +158,7 @@ namespace Qml.Net
         void RequestTrigger(IntPtr app);
         [NativeSymbol(Entrypoint = "qguiapplication_exit")]
         void Exit(IntPtr app, int returnCode);
+        [NativeSymbol(Entrypoint = "qguiapplication_internalPointer")]
+        IntPtr InternalPointer(IntPtr app);
     }
 }

src/net/Qml.Net/QQmlApplicationEngine.cs

@@ -10,7 +10,13 @@ namespace Qml.Net
     public sealed class QQmlApplicationEngine : BaseDisposable
     {
         public QQmlApplicationEngine()
-            :base(Interop.QQmlApplicationEngine.Create())
+            :base(Interop.QQmlApplicationEngine.Create(IntPtr.Zero))
+        {
+            
+        }
+
+        internal QQmlApplicationEngine(IntPtr existingEngine)
+            :base(Interop.QQmlApplicationEngine.Create(existingEngine))
         {
             
         }
@@ -24,6 +30,13 @@ namespace Qml.Net
         {
             Interop.QQmlApplicationEngine.LoadData(Handle, data);
         }
+        
+        public void AddImportPath(string path)
+        {
+            Interop.QQmlApplicationEngine.AddImportPath(Handle, path);
+        }
+        
+        internal IntPtr InternalPointer => Interop.QQmlApplicationEngine.InternalPointer(Handle);
 
         public static int RegisterType<T>(string uri, int versionMajor = 1, int versionMinor = 0)
         {
@@ -49,11 +62,6 @@ namespace Qml.Net
             InteropBehaviors.RegisterQmlInteropBehavior(new MvvmQmlInteropBehavior(), false);
         }
 
-        public void AddImportPath(string path)
-        {
-            Interop.QQmlApplicationEngine.AddImportPath(Handle, path);
-        }
-
         protected override void DisposeUnmanaged(IntPtr ptr)
         {
             Interop.QQmlApplicationEngine.Destroy(ptr);
@@ -63,7 +71,7 @@ namespace Qml.Net
     internal interface IQQmlApplicationEngine
     {
         [NativeSymbol(Entrypoint = "qqmlapplicationengine_create")]
-        IntPtr Create();
+        IntPtr Create(IntPtr existingEngine);
         [NativeSymbol(Entrypoint = "qqmlapplicationengine_destroy")]
         void Destroy(IntPtr engine);
 
@@ -78,5 +86,8 @@ namespace Qml.Net
 
         [NativeSymbol(Entrypoint = "qqmlapplicationengine_addImportPath")]
         void AddImportPath(IntPtr engine, [MarshalAs(UnmanagedType.LPWStr), CallerFree]string path);
+        
+        [NativeSymbol(Entrypoint = "qqmlapplicationengine_internalPointer")]
+        IntPtr InternalPointer(IntPtr app);
     }
 }