QT send file by http request POST - c++

Question

I work with Qt and I try to send by http request a file like an image or a video to my NodeJS server.
I have a problem with the data send, when I read the file and I send to the server the data I don't receive the good character. I guess the problem come from the unicode, utf16 or something like that because it is working with a file.txt and not with an image.jpg
This is my function where I read and send the file. This one is called until the read function ended.
void FileManager::sendFileDataToServer(QString pathFile, QString location) {
CredentailsTable cdt;
if (_qfile->isOpen())
{
QString data;
if (!_in->atEnd()) {
data = _in->read(_socketManager->getBufferSize()); // read file
cdt.addCredential("name", getNameFile(_pathSendFile)); // set data
cdt.addCredential("msg", data);
_fileRequest->request(FileRequest::POST, FileRequest::Write, cdt);
}
else {
_qfileTest->close();
qDebug("End file");
}
}
else
qDebug("Error open file");
}
This function is called every time when the server respond
void FileManager::responseSendFileDataToServer(QNetworkReply *reply) {
if (reply->error() != 0)
{
qDebug("Il y a eu une erreur sur le server %d", reply->error());
return ;
}
else
this->sendFileDataToServer(_pathSendFile, _locationFileServer);
}
This is where my request is send
void ServiceRequest::request(Type type, int request, QByteArray cdt) {
QString strRequest = "REQUEST : http://" + _host + _prefixRoute + getRoute(request);
qDebug(strRequest.toStdString().c_str());
switch (type) {
case POST: {
QNetworkRequest networkRequest = QNetworkRequest(QUrl("http://" + _host + _prefixRoute + getRoute(request)));
networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
QNetworkReply *replyPost = this->post(networkRequest, cdt);
connect(replyPost, static_cast<void(QNetworkReply::*)(QNetworkReply::NetworkError)>(&QNetworkReply::error), this, &ServiceRequest::slotError);
connect(replyPost, &QNetworkReply::sslErrors, this, &ServiceRequest::slotSslErrors);
break;
}
My nodeJS function :
var write = function(req, res) {
fs.appendFile("users/" + req.body.name, req.body.msg, "UCS2",
function(err) {
return res.status(200).json(err);
})
}