Asynchronous file IO

[Hesam_GL]

Are there any facilities for asynchronous file IO in Qt?

[kuzulis]

Hi. It seems isn't present.

Async I/O is used only for Sockets, Pipes, Serial communication resources, but for Files - not. If I am not mistaken...

BTW: on Qt's bug tracker I found earlier a "suggestion ":https://bugreports.qt-project.org/browse/QTBUG-19345 to make asynchronous I/O for files... But there are many problems in case of implementation in *nix (if I correctly understood "it":http://tinyclouds.org/iocp-links.html)

[MuldeR]

Should be possible to implement this with QtConcurrent, I think.
@QByteArray myOp(QFile *aFile)
{
QByteArray data = aFile->readAll();
return data;
}

/* ---------------- */

main()
{
QFile aFile("in.txt");
if (!aFile.open(QIODevice::ReadOnly)
return;

QFuture<QByteArray> future = QtConcurrent::run(myOp, &aFile);

/* do something else*/

QByteArray data = future.result()

}@

See also QFutureWatcher, if you want to be informed by a signal when the operation is done.

[andre]

Using QtConcurrent is basically what I did to create async file I/O in our application. And yes, that works just fine.