Qt-interest Archive, June 2007
QFile::copy() let the source file opened ?...
Message 1 in thread
Hi !
When QFile::copy() is called it seems that copy() do not close the source
file when the file operation has been done. I run the latest KUbuntu distro
with Qt 4.3 (but the same thing happened in 4.2) and I cannot open the
source file without beeing forced to close it manually before calling
QFile::open().
Is it :
* An undocumented behaviour (in this case you should update your help since
there is nothing about a such behaviour)
* Something I missed (OK, it can be my fault ;-)
* A bug ?
I created a demo program to reproduce what I experienced :
#include <iostream>
#include <iostream>
#include <QFile>
#include <QIODevice>
#include <QApplication>
void die(const QString& msg)
{
std::cout << qPrintable(msg) << std::endl;
exit(1);
}
void testCopy()
{
QFile src("./sourcefile");
if (!src.exists())
die(QString("The source file does not exists."));
QFile target("./targetfile");
if (target.exists())
if (!target.remove())
die(QString("Target file exists and cannot be removed.
Aborting."));
if (!src.copy(target.fileName()))
die(QString("The file cannot be copied."));
else
std::cout << "Copy succeeded, OK" << std::endl;
//#define WORKAROUND
#ifdef WORKAROUND
src.close(); /* Should not be needed ?! */
#endif
if (src.open(QIODevice::ReadOnly))
{
std::cout << "All tests succeeded, good !!" << std::endl;
src.close();
} else
std::cout << "Cannot open \"src\". Maybe it has not been closed in
QFile::copy() ?..." << std::endl;
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
testCopy();
return 0;
}
When WORKAROUND is not defined, I've got the following output :
adrien@adrien:~/copytest$ ./copytest
Copy succeeded, OK
QFile::open: File (./sourcefile) already open /* <- Qt's internal error
message /*
Cannot open "src". Maybe it has not been closed in QFile::copy() ?...
When WORKAROUND is defined, all works fine :
adrien@adrien:~/copytest$ ./copytest
Copy succeeded, OK
All tests succeeded, good !!
So, is it "as designed" or a bug ? Any hint appreciated !
Best regards,
A.R.
Message 2 in thread
> When QFile::copy() is called it seems that copy() do not close the
source
> file when the file operation has been done. I run the latest KUbuntu
> distro with Qt 4.3 (but the same thing happened in 4.2) and I cannot
open
> the source file without beeing forced to close it manually before
calling
> QFile::open().
>
> Is it :
> * An undocumented behaviour (in this case you should update your help
> since there is nothing about a such behaviour)
> * Something I missed (OK, it can be my fault ;-)
> * A bug ?
i suggest to send this to qt-bugs@xxxxxxxxxxxxx this doesn't sound
right.
Cheers,
Peter
--
[ signature omitted ]
Message 3 in thread
Hi,
> i suggest to send this to qt-bugs@xxxxxxxxxxxxx this doesn't sound
> right.
Thanks, I'll do that.
Regards,
A.R.
