QFile copy connect bytesWritten

[realdarkman71]

Hi all,

short question with simple code:

QFile from("/home/chris/backup.tar.bz2");
QFile to("/home/chris/Test/backup.tar.bz2");
 
connect(&to, SIGNAL(bytesWritten(qint64)), this, SLOT(onWrite(qint64)));
 
from.copy(to.fileName());
 
(...)
 
void MyClass::onWrite(qint64 bytes) {
    qDebug() << bytes;
}

QFile from("/home/chris/backup.tar.bz2");
QFile to("/home/chris/Test/backup.tar.bz2");

connect(&to, SIGNAL(bytesWritten(qint64)), this, SLOT(onWrite(qint64)));

from.copy(to.fileName());

(...)

void MyClass::onWrite(qint64 bytes) {
    qDebug() << bytes;
}

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The file will be copied, but no bytes are shown! Why?

Thx!
Chris

[Santosh Reddy]

bytes will be copied if you copy them, i don't see any copying code.

byteWritten() i emitted when bytes are written to the file, you should connect to this signal (shich you have already done), now in the onWrite() slot, you should copy the bytes

-Reply Recalled

[realdarkman71]

Line 6: from.copy(to.fileName()); ?

[Lesiok]

Line 6: from.copy(to.fileName()); ?

1. I think that from.copy() don't use Yours to QFile object but creates new one.
2. From QFile doc : Unlike other QIODevice implementations, such as QTcpSocket, QFile does not emit the aboutToClose(), bytesWritten(), or readyRead() signals.

[realdarkman71]

Ups, I did not seen this hint in the doc!

What can I use? Any hints?

[high_flyer]

You try using QFileSystemWatcher on the destination QFile object.
EDIT:
This will also not work if you use QFile::copy().

What exactly do you need?

[realdarkman71]

...a progress bar for copy process! Not file to file, copied bytes per file!

[Lesiok]

Look at QtCopyDialog.

[realdarkman71]

Ok, thanks for the hint!