A Qt Quick 2 extension plugin for file IO which can be used in statically-linked Qt Quick applications

fieliosingleton.h

#ifndef FILEIOSINGLETON_H
#define FILEIOSINGLETON_H

#include <QQuickItem>
#include <QDir>
#include <QFile>

class CFileIoSingleton : public QQuickItem
{
    Q_OBJECT
    Q_DISABLE_COPY(CFileIoSingleton)

    CFileIoSingleton() {}
    ~CFileIoSingleton() {}


public:
    static QObject *qmlInstance(QQmlEngine* pEngine, QJSEngine* pScriptEngine)
    {
        Q_UNUSED(pEngine);
        Q_UNUSED(pScriptEngine);

        return new CFileIoSingleton;
    }

    //-------------------------------------------------------------------------------------------------
    // Method definitions
    //-------------------------------------------------------------------------------------------------


    /**
     * @brief Checks if a file with the given path exists
     *
     * @param filePath Full path to the file
     * @return True if the file exists, false if not
     */
    Q_INVOKABLE static bool doesFileExist(QString filePath)
    {
        QFile theFile(filePath);
        return theFile.exists();
    }


    /**
     * @brief Get the size of a file, in bytes
     *
     * If the file doesn't exist, this function returns zero.
     *
     * @param filePath Full path to the file
     * @return
     */
    Q_INVOKABLE static int getFileSizeBytes(QString filePath)
    {
        if (!doesFileExist(filePath))
        {
            return 0;
        }

        QFile theFile(filePath);
        return theFile.size();
    }


    /**
     * @brief Check if a directory exists.
     *
     * @param directoryPath Directory path
     * @return True if the directory exists
     */
    Q_INVOKABLE static bool doesDirectoryExist(QString directoryPath)
    {
        QDir theDirectory(directoryPath);
        return theDirectory.exists();
    }


};

#endif // FILEIOSINGLETON_H

fileioplugin.pro

TEMPLATE = lib
TARGET = fileioplugin
QT += qml quick
CONFIG += qt plugin

TARGET = $$qtLibraryTarget($$TARGET)
uri = com.yourcompany.qmlcomponents
QMAKE_MOC_OPTIONS += -Muri=com.yourcompany.qmlcomponents

# Input
SOURCES += \
    fileioplugin_plugin.cpp \
    fileiosingleton.cpp \
    FileIoSingleton.qml

HEADERS += \
    fileioplugin_plugin.h \
    fileiosingleton.h

DISTFILES = qmldir

qmldir.files = qmldir

fileioplugin_plugin.cpp

#include "fileioplugin_plugin.h"
#include "fileiosingleton.h"

#include <qqml.h>

void CFileIoPlugin::registerTypes(const char *uri)
{
    // @uri com.yourcompany.qmlcomponents
    qmlRegisterSingletonType<CFileIoSingleton>(uri, 1, 0, "FileIoSingleton", &CFileIoSingleton::qmlInstance);
}

fileioplugin_plugin.h

#ifndef FILEIOPLUGIN_PLUGIN_H
#define FILEIOPLUGIN_PLUGIN_H

#include <QQmlExtensionPlugin>

class CFileIoPlugin : public QQmlExtensionPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")

public:
    void registerTypes(const char *uri);
};

#endif // FILEIOPLUGIN_PLUGIN_H

qmldir

module com.yourcompany.qmlcomponents
plugin fileioplugin
classname CFileIoPlugin
typeinfo plugins.qmltypes