Android and iOS File Read and Write using QML

Bongani

I am developing a native mobile App for both android and iOS device, is it possible to create text files in the phone's internal storage and read from them using QML ?

SGaist

Hi,

Purely on QML ? AFAIK, no. But you can provide your own C++ extension that will do it and use it from your QML code.

ekkescorner

this works on android and iOS:

bool ApplicationUI::checkDirs()
{
    // Android: HomeLocation works, iOS: not writable
    // Android: AppDataLocation works out of the box, iOS you must create the DIR first !!
    mDataPath = QStandardPaths::standardLocations(QStandardPaths::AppDataLocation).value(0);
    qDebug() << "Data Path: " << mDataPath;
    QDir myDir(mDataPath);
    if (!myDir.exists()) {
        bool ok = myDir.mkpath(mDataPath);
        if(!ok) {
            qWarning() << "Couldn't create dir. " << mDataPath;
            return false;
        }
        qDebug() << "created directory path" << mDataPath;
    }
    return true;
}

now you can read and write as usual

QFile readFile(mDataPath+"/yourfile.txt");
if(!readFile.exists()) {
        qDebug() << "file doesn't exist ";
        return false;
    }
    if (!readFile.open(QIODevice::ReadOnly)) {
        qWarning() << "Couldn't open file";
        return false;
    }

took me some time to figure out that AppDataLocation already exists on Android, but must be created on iOS

more infos:
https://developer.android.com/guide/topics/data/data-storage.html#filesInternal
https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html
http://doc.qt.io/qt-5/qstandardpaths.html#standardLocations

Bongani

Thanks @ekkescorner , your solution worked superbly. Much appreciated.