Failed to create QFile when deploying to Android device

[jsulm]

@a_so said in Failed to create QFile when deploying to Android device:

certFile.open(QIODevice::ReadOnly);
if(certFile.open(QIODevice::ReadOnly)) {
qWarning() << "certFile is open";
certFile.close();
}

Why do you open the file twice in read only mode?!

[J.Hilk]

@a_so api 23 is Android 6.0 Marshmallow, comes with the problems, you could try a lower one.

Adjustment of your code sample, to what @jsulm said:

        if(certFile.exists()) {
            qWarning() << "cert file exists";
        }
        else
        {
            qWarning() << "cert file does not exist";
            if(certFile.open(QIODevice::ReadOnly)) {
                    qWarning() << "certFile created";
                    certFile.close();
            }else qWarning() << "certFIle could not be created";
        }
      
        if (!certFile.open(mode)) {
            qCritical() << "so_SslClient: Error reading or writing cert-File";
            return QSslCertificate();
        }

edit:
Also you return, without closing the file! You shouldn't do that...

[a_so]

@jsulm this is the very original code. My client runs also on Linux and Windows. There the folder for certificates is created in the current directory of my project, where .pro and all header and source files are located.

QSslCertificate so_SslClient::certFileOnDisk(const OpenMode mode, const QSslCertificate &cert)
{
    //Get the current directory
    QString currentDir = QCoreApplication::applicationDirPath();
    QString certDir = currentDir + QDir::separator() + "certs";

    if (!QDir(certDir).exists()) {
        QDir(currentDir).mkdir("certs");
        qDebug() << "so_SslClient: No 'certs' folder in app-dir, created one";
    }

    //Save the file under the hostname + 'pem' file ending
    QString certNameOnDisk = _hostName + "pem";

    //Open the File
    QFile certFile(certDir + QDir::separator() + certNameOnDisk, this);
    if (!certFile.open(mode)) {
        qCritical() << "so_SslClient: Error reading or writing cert-File";
        return QSslCertificate();
    }

    //Write the file to disk
    if (mode == QIODevice::WriteOnly) {
        if (certFile.write(cert.toPem()) == cert.toPem().length()) {
            qDebug() << "so_SslClient: New trusted certificate written with success";
        }
        return QSslCertificate();
    }

    //Read the file from disk
    QSslCertificate localCert = QSslCertificate(&certFile, QSsl::Pem);
    if (localCert.isNull()) {
        qWarning() << "so_SslClient: Certificate file empty";
    }
    return localCert;
}
  

[a_so]

@jsulm I am sorry. My mistake, not intentionally.

[a_so]

Guys thank you so much! The adjusted code from @J-Hilk did it for me + I used target SDK 21. Thank you for your help!