Count files of a directory

[radu_d]

I want to count the number of files from a directory and all its subdirectories recursively. My code is:

int DocumentsManager::CountFiles(QString path)
{
	int sum = 0;
	QDir dir(path);
	dir.setFilter(QDir::AllDirs | QDir::NoDotAndDotDot);
	QFileInfoList lst = dir.entryInfoList();
	for(int i = 0; i < lst.size(); i++)
	{
		sum = sum + CountFiles(lst.at(i).canonicalPath());
	}
	dir.setFilter(QDir::Files);
	return dir.entryInfoList().size() + sum;
}

int DocumentsManager::CountFiles(QString path)
{
	int sum = 0;
	QDir dir(path);
	dir.setFilter(QDir::AllDirs | QDir::NoDotAndDotDot);
	QFileInfoList lst = dir.entryInfoList();
	for(int i = 0; i < lst.size(); i++)
	{
		sum = sum + CountFiles(lst.at(i).canonicalPath());
	}
	dir.setFilter(QDir::Files);
	return dir.entryInfoList().size() + sum;
}

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The problem is that sometimes I got the following error:
ASSERT: i>=0 && i < size()

Do you have any idea why? Thank you.