QFile.write（）只寫大文件的第一22MBytes

Question

我有以下代碼：

QNetworkAccessManager *nam = new QNetworkAccessManager(this); 
QNetworkReply *re = nam->get(QNetworkRequest(QUrl("http://somesite/ai.bin"))); 
QEventLoop loop; 
QObject::connect(reply, SIGNAL(readyRead()), &loop, SLOT(quit())); 
int timeInSeconds = 10; 
QTimer *idleTimer = new QTimer(this); 
connect(idleTimer,SIGNAL(timeout()),&loop,SLOT(quit())); 
idleTimer->setInterval(timeInSeconds *1000); 
idleTimer->start(); 
loop.exec(); 

//save 
QFile file("C:/a.jpg"); 
file.open(QIODevice::WriteOnly); 
file.write(re->readAll()); 

ui->dbgOut->insertHtml("<font color='green'>OK</font><br>"); 

如果遠程文件爲5 MB，它的工作原理，BT如果該文件是ABOT 50或500MB，則程序只保存前22 MB，而該過程仍然在後臺下載文件。

我在做什麼錯？

Answer 1

根據您的互聯網連接，10秒可能不足以全部下載。不要像這樣使用計時器。要看到即時效果，請放下這些行：

int timeInSeconds = 10; 
QTimer *idleTimer = new QTimer(this); 
connect(idleTimer,SIGNAL(timeout()),&loop,SLOT(quit())); 
idleTimer->setInterval(timeInSeconds *1000); 
idleTimer->start();