问Qt不能写入文件。文件存在，未打开，“未知错误”(Windows )

EN

#include <QStringList>
#include <QDir>
#include <QFile>
#include <QString>
#include <QTextStream>


void HandleCSV::writeToPIDCSV(UserAccount newUser)
{
    // Storing in userPID db
    QString filePath = returnCSVFilePath("dbPID");
    qDebug() << "File path passsed to writeToPIDCSV is " <<  filePath;

    // Open CSV filepath retrieved from associated dbName
    QFile file(filePath);
    if (!file.open(QIODevice::ReadWrite | QIODevice::Append))
    {

        qDebug() << file.isOpen() << "error " << file.errorString();
        qDebug() << "File exists? " << file.exists();
        qDebug() << "Error message: " << file.error();
        qDebug() << "Permissions err: " << file.PermissionsError;
        qDebug() << "Read error: " << file.ReadError;
        qDebug() << "Permissions before: " << file.permissions();
        // I tried setting permissions in case that was the issue, but there was no change
        file.setPermissions(QFile::WriteOther);
        qDebug() << "Permissions after: " << file.permissions();


    }
//    if (file.open(QIODevice::ReadWrite | QIODevice::Append))

    else
    {
        qDebug() << "Is the file open?" << file.isOpen();

        // Streaming info back into db
        QTextStream stream(&file);
        stream << newUser.getUID() << "," << newUser.getEmail() << "," << newUser.getPassword() << "\n";

    }
    file.close();
}

File path passsed to writeToPIDCSV is  ":/database/dummyPID.csv"
false error  "Unknown error"
File exists?  true
Error message:  5
Permissions err:  13
Read error: 1
Permissions before:  QFlags(0x4|0x40|0x400|0x4000)
Permissions after:  QFlags(0x4|0x40|0x400|0x4000)

#include <QStringList>
#include <QDir>
#include <QFile>
#include <QString>
#include <QTextStream>
#include <QStandardPaths>

void HandleCSV::writeToPIDCSV(UserAccount newUser)
{
    auto path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
    if (path.isEmpty()) qFatal("Cannot determine settings storage location");
    QDir d{path};
    QString filepath = returnCSVFilePath("dbPID");

    if (d.mkpath(d.absolutePath()) && QDir::setCurrent(d.absolutePath()))
    {
        qDebug() << "settings in" << QDir::currentPath();
        QFile f{filepath};
        if (f.open(QIODevice::ReadWrite | QIODevice::Append))
        {
            QTextStream stream(&f);
            stream << newUser.getUserFirstName() << ","
                   << newUser.getUserIDNumber()  << "\n";
        }
    }
}