qt - QNetworkAccessManager::put - QIODevice::read:将文件发送到 ftp 服务器后设备未打开

Question

当我将文件发送到 ftp 服务器时，我收到消息 QIODevice::read: device not open (after sent this file..)

输出看起来像这样:

Uploaded 1673 of 1673

QIODevice::read: device not open

Finished 0

#include "uploader.h"
 
Uploader::Uploader(QObject *parent) :
    QObject(parent)
{
}
 
void Uploader::start(const QString &fileName) {
    QUrl url("ftp://adresIP/test/tt.txt");
    url.setUserName("ftp@domena.pl");
    url.setPassword("passwd");
 
    file = new QFile(fileName);
 
    QByteArray putData;
 
    file->open(QIODevice::ReadOnly);
 
    putData.append(file->readAll());
 
    //-- other attempts
    file->flush();
    file->close();
    delete file;
    //--
 
    reply = nam.put(QNetworkRequest(url), putData);
    connect(reply, SIGNAL(uploadProgress(qint64, qint64)), this, SLOT(uploadProgress(qint64, qint64)));
    connect(reply, SIGNAL(finished()), this, SLOT(uploadDone()));
 
}
 
 
void Uploader::uploadProgress(qint64 bytesSent, qint64 bytesTotal) {
    qDebug() << "Uploaded" << bytesSent << "of" << bytesTotal;
}
 
void Uploader::uploadDone() {
    qDebug() << "Finished" << reply->error();
 
    reply->deleteLater();
}
 
//uploader.h
   QNetworkAccessManager nam;
   QFile *file;
   QNetworkReply *reply;
 
//main.cpp
Uploader u;
u.start("F:\\song.mp3");

编辑:

我在 Ubuntu(之前是 Windows，Qt 5.3)上对 Qt 5.0.1 进行了测试，这里一切正常(未显示消息 QIODevice::read: device not open。 .).可能是 Qt Framework 错误？

Answer 1

我觉得是qt的问题。在 ftp 上传 wirh qt 5.3 win vs2010 后，我收到了同样的警告。安装 5.5 后，消息消失了。