Reading Content of Directory Effectively

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Created: kamaljaiswal (25 Oct 2007)

Last edited: hamishwillee (26 Jul 2012)

The RDir class allows you to open a directory and read the entries it contains. There are several different ways to read the contents of a directory.

Each call to Read() reads a single entry, which is useful in cases where memory usage needs to be minimized.

However, it is inefficient to make multiple calls to a server function, so RDir also supplies an overloaded method Read() that, in a single call, reads several entries into a TEntryArray.

The number of entries contained in each TEntryArray cannot be determined before a call to Read() because the length of each file or directory name is likely to be different.

void ReadDirContentsL(RFs& aFs, const TDesC& aDirName)
{
	RDir myDir;
	TInt err;
	User::LeaveIfError(myDir.Open(aFs, aDirName,
	KEntryAttNormal| KEntryAttDir));
	TEntry currentEntry;
	FOREVER
	{
		err = myDir.Read(currentEntry);
		if (err)
		{
			break; // No more entries, or some other error
		}
		// Process this entry
	}
	myDir.Close()
	if (err != KErrEof) // EOF signifies no more entries to read
	{
		User::LeaveIfError(err);
	}
}