QNetworkAccessManager多次上傳失敗

Question

在我的應用程序中，我有一種方法將文件上傳到服務器，這工作正常。

但是當我一次調用這個方法多次（比如迭代chooseFilesDialog的結果）前7個（或多或少）文件上傳正確，其他人永遠不會上傳。

我認爲這必須與服務器不允許超過來自同一個來源的X連接的事實相關嗎？

如何確保上載等待免費建立的連接？

這是我的方法：

QString Api::FTPUpload(QString origin, QString destination) 
{ 
    qint64 timestamp = QDateTime::currentMSecsSinceEpoch(); 
    QUrl url("ftp://ftp."+getLSPro("domain")+destination); 
    url.setUserName(getLSPro("user")); 
    url.setPassword(getLSPro("pwd")); 

    QFile *data = new QFile(origin, this); 
    if (data->open(QIODevice::ReadOnly)) 
    { 
     QNetworkAccessManager *nam = new QNetworkAccessManager(); 
     QNetworkReply *reply = nam->put(QNetworkRequest(url), data); 
     reply->setObjectName(QString::number(timestamp)); 
     connect(reply, SIGNAL(uploadProgress(qint64, qint64)), SLOT(uploadProgress(qint64, qint64))); 

     return QString::number(timestamp); 
    } 
    else 
    { 
     qDebug() << "Could not open file to FTP"; 
     return 0; 
    } 
} 

void Api::uploadProgress(qint64 done, qint64 total) { 
    QNetworkReply *reply = (QNetworkReply*)sender(); 
    emit broadCast("uploadProgress","{\"ref\":\""+reply->objectName()+"\" , \"done\":\""+QString::number(done)+"\", \"total\":\""+QString::number(total)+"\"}"); 
} 

Answer 1

首先，不要創建QNetworkManager每次啓動的上傳時間。
其次，你一定要刪除你所有的東西new()，否則你會留下內存泄漏。這包括QFile,QNetworkManager和QNetworkReply（！）。
第三，你必須等待finished()信號。

Api::Api() { //in the constructor create the network access manager 
    nam = new QNetworkAccessManager() 
    QObject::connect(nam, SIGNAL(finished(QNetworkReply*)), this, SLOT(finished(QNetworkReply*))); 
} 

Api::~Api() { //in the destructor delete the allocated object 
    delete nam; 
} 

bool Api::ftpUpload(QString origin, QString destination) { 
    qint64 timestamp = QDateTime::currentMSecsSinceEpoch(); 
    QUrl url("ftp://ftp."+getLSPro("domain")+destination); 
    url.setUserName(getLSPro("user")); 
    url.setPassword(getLSPro("pwd")); 

    //no allocation of the file object; 
    //will automatically be destroyed when going out of scope 
    //I use readAll() (see further) to fetch the data 
    //this is OK, as long as the files are not too big 
    //If they are, you should allocate the QFile object 
    //and destroy it when the request is finished 
    //So, you would need to implement some bookkeeping, 
    //which I left out here for simplicity 
    QFile file(origin); 
    if (file.open(QIODevice::ReadOnly)) { 
     QByteArray data = file.readAll(); //Okay, if your files are not too big 
     nam->put(QNetworkRequest(url), data); 
     return true; 

     //the finished() signal will be emitted when this request is finished 
     //now you can go on, and start another request 
    } 
    else { 
     return false; 
    } 
} 

void Api::finished(QNetworkReply *reply) { 
    reply->deleteLater(); //important!!!! 
}