Retrieve whole folder-size
Hi,
I read a lot of text on several websites, of course Codeguru too about retrieving the size of a directory with all files and subdirs summarized.
All I found described the solution as recursively parse the dirs using FindFirstFile, FindNextFile etc.
Ok, that is what I did first too, and I have a class named DirectoryWalker that does that job (among others) very well.
Anyway, I allways asked myself if there is any easier way to get the size of a Dir. Iheard rumors about some weird shell-fuctions working with shell-objects, and I remember through the mist of time that somebody told me there is a way to use them to do my task. now I read through MSDN and couldn't find anything about my problem and a solution using shell-functions.
So I ask you: Do you know such a magic way like calling a function GetDirSize() or so from Win32API ?
Somebody told me, that Win-Explorer also retrieves dirsize recursing the directory when showing properties. Maybe my code is inefficient, because my recursing and summarizing routine takes much more time to retrieve the size of a dir as the explorer takes. I optimized the dirwalk over and over, but it stays rather slow. I found one part of my code that might cause the slowdown, but cannot find a way to optimize that. It is for getting the REAL occupation of diskspace for a file including clustering.
I have one unsigned int called clustersize for the size of one cluster initialized. also I have a int64 called filesize for the actual physical filesize. the algorythm is performed for EACH file found in the dir and its subdirs and looks like this:
int r = filesize % clustersize;
if (r > 0)
{
filesize -= r;
filesize += clustersize
}
That's all, any suggestions ?
Since my application in progress is a diskspace-monitoring-tool the operation of retrieving the whole size of a folder is relative often used, which makes it VERY neccessary to get this work done quick.
I would appreciate any help.
thanx in advance
Juergen
