QFileDialog慢速网络

Question

I am using QFileDialog both getOpenFileName and getSaveFileName . I have a file out on the network (slow connection), that I load with getOpenFileName . Then if I try to create a new QFileDialog , it takes forever to load.

I looked at the process with Process Monitor and I can see it slowly crawling through every file in the network location where I last opened the file. It remains slow until I restart the computer. What can I do to speed this up?

Here is some code:

Open File Dialog

QString filename;
QFileDialog fd(this);
filename = fd.getOpenFileName(this,tr("Open CSV File"), ".",tr("CSV Files (*.csv)"));

Save File Dialog

QString filename;
QFileDialog fd(this);
filename = fd.getSaveFileName(this,tr("Save CSV File"), ".",tr("CSV Files (*.csv)"));

Thank you.

Answer 1

Unfortunately, there's nothing else that you can do about that if you use the native dialog like you do. The getOpenFileName opens the native file dialog, and it's this native platform code that enumerates the files in the target directory.

If you don't need the native dialog, you can do all sorts of things to work around the blocking/synchronous directory iteration interface to fundamentally asynchronous I/O resources.

Answer 2

Try the option QFileDialog::DontUseNativeDialog . This should forbid to open a native dialog.

I am using non-native dialogs (by deriving from QFileDialog) for years to get rid of the problems you described.