FindFiles without GUI
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I want to load all filename-strings of a directory.
@
QFileSystemModel *datafolder;
...
datafolder= new QFileSystemModel;
...
void MainWindow::LoadFiles() {
connect(datafolder, SIGNAL(directoryLoaded (const QString & )), this, SLOT(LoadFilesOKSlot()));
datafolder->setFilter(QDir::AllEntries);
datafolder->setRootPath("d:/data"); //tested with lots of different paths..
}
void MainWindow::LoadFilesOKSlot() { //slot invoked when QFileSystemModel finished caching the files/dirs...
int numRows, numCols, i, j;
QString x;
QModelIndex ndx= datafolder->index("d:/data"); //tested with lots of different paths..
numRows = datafolder->rowCount(ndx);
numCols = datafolder->columnCount(ndx); // <<< breakpoint here for checking the row/col values
for (i= 0; i < numRows; ++i) {
for (j= 0; j < numCols; ++j) {
x= datafolder->data(index(i,j), Qt:: DisplayRole).toString(); // <<< breakpoint here for checking strings
}
}
}
@Code compiles and DOES something: numCols always set to 4, numRows usually 0 or 1. When there is a valuable row, then 1st column is for name, 2nd empty, 3rd is the type, 4th is the date...that's fine
The problem is that any directory I set by
@QModelIndex ndx= datafolder->index("d:/data");@
I get only 1 valuable row, that is for the root of the actual drive, instead of e.g. "D:/data" folder content.
Sometimes I get more rows (4 and 6 rows already "happened"), but all items are empty except the first row.If I connect QFileSystemModel to a QTreeView, everything is fine on the screen.
How could I get all the filenames in a given directory? -
I suggest you use QDir class in your case.
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QFileSystemModel uses lazy loading. I suggest you call "canFetchMore() ":http://doc.trolltech.com/stable/qabstractitemmodel.html#canFetchMore and if that returns true call "fetchMore() ":http://doc.trolltech.com/stable/qabstractitemmodel.html#fetchMore
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Why are you using QFileSystemModel instead of QDirIterator?
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Thanks, Denis,
I hoped that walking through subdirs would be easier with the QFileSystemModel, but QDir + "manual handling" of sub-directories seems to be proper. I just try to understand why the QFileSystemModel approach wasn't working :) -
[quote author="Volker" date="1295910280"]QFileSystemModel uses lazy loading. I suggest you call "canFetchMore() ":http://doc.trolltech.com/stable/qabstractitemmodel.html#canFetchMore and if that returns true call "fetchMore() ":http://doc.trolltech.com/stable/qabstractitemmodel.html#fetchMore[/quote]
Originally after running setRootPath() I immediately called rowCount() --and got 0 or 1 row.
When I have found in the doc's that it is in a seperate thread and directoryLoaded() signal is emitted by QFileSystemModel when reading/caching the whole filesystem is ready, I re-wrote the code into a slot function.
It was suspicious that why is there a canFetchMore(), if slot called when all done ? -
[quote author="novaktamas" date="1295911687"]It was suspicious that why is there a canFetchMore(), if slot called when all done ?
[/quote]This function is virtual in QAbstractItemModel and is reimplemented in QFileSystemModel. It is called when a branch in the tree view is opened that is not yet cached.
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[quote author="peppe" date="1295910898"]Why are you using QFileSystemModel instead of QDirIterator?[/quote]
Thanks, Peppe,
that's the winning idea by now:)) I came from the direction of Borland's c++Builder, and QDirIterator is closest to the good old FindFirst/FindNext. I started flirting with Qt Creator 2 weeks ago, and it's hard to review the so many classes. Sometimes the real one can't be found...