Suggestion Required on getting Multiple files size...

[nagasrikanth]

Hello coders..

As part of my task, I need to get file size of some files, which i can get very easily by using FileInfo class.. As of now, I'm looping through all files in My Directory and then taking their file sized into a notepad.

But the real problem for me is,Like this, I'm having around 100 Root directories, each contains ~ 1000 subdirectories and each sub directory contains ~ 80 files..

Yes, I know, that, I can use a recursive function and loop through all dirs and sub dirs and thus the files.. which was taking huge efforts in terms of time.

I want to know, If there was any other alternative, which will make my task more easier and efficient..

If it is clear, Then i would like to further ask some more questions on this topic.

[sapator]

You can use a backgroundworker and let it run.

[nagasrikanth]

Thanx Sapator, Actually, I want to reduce the time taking by my application. BAckgroundworker class will help me to take care of my UI, Which in my case is nothing but a simple button

I want to know, If there was any special classes/some thing like that, which will tell me the file sizes of all files in a directory in one shot.

Well, Here is my second Question if the answer for my above question is "NO".
How can i tell my application to use maximum of my RAM (It will be nice, If i able to tell use 3.5 GB ram from the available 4GB RAM). Am I asking to place Moon in my Hand ??

[jmcilhinney]

Open Windows Explorer and then right-click on a large folder and select Properties. Notice how the size of the folder is calculated before your eyes? If Windows Explorer has to do it then your app has to do it too.

I've never used it so I can't give you details but, with regards to memory usage, you should look at the Process class and, in particular, its MinWorkingSet property.

[sapator]

Hi.
The only other method i'm aware and it's worth taking a look at for speed is to use API. Supposedly explorer uses API for getting the files so you may want to try this.XP tested.

Put a button (button2) and a textbox(textbox1).

Imports System.IO
Imports System.Runtime.InteropServices

Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim hsearch As IntPtr  
    Dim findinfo As WIN32_FIND_DATA 
    Dim retv As Integer  

    <DllImport("kernel32.dll", CharSet:=CharSet.Auto)> _
Private Shared Function FindFirstFile(ByVal lpFileName As String, ByRef lpFindFileData As WIN32_FIND_DATA) As IntPtr
    End Function
    <DllImport("kernel32.dll")> _
Public Shared Function FindClose(ByVal hFindFile As IntPtr) As Boolean
    End Function


    <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
    Structure WIN32_FIND_DATA
        Public dwFileAttributes As Int32
        Public ftCreationTime As System.Runtime.InteropServices.FILETIME
        Public ftLastAccessTime As System.Runtime.InteropServices.FILETIME
        Public ftLastWriteTime As System.Runtime.InteropServices.FILETIME
        Public nFileSizeHigh As Int32
        Public nFileSizeLow As Int64
        Public dwReserved0 As Int32
        Public dwReserved1 As Int32
        <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=260)> Public cFileName As String
        <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=14)> Public cAlternateFileName As String
    End Structure

'''' Put all the above before the form generated code,if you have it in the '''same file

'After...

  Private intfilesize As Int64 = 0

 Public Function goread(ByVal strfilename As String) As Integer
        Try
           
            hsearch = FindFirstFile(strfilename, findinfo)
          
            intfilesize = intfilesize + findinfo.nFileSizeLow
            ' Close the file search handle
            retv = FindClose(hsearch)
        Catch ex As IOException
            MsgBox(ex.ToString)
        
        End Try
    End Function

Public Sub ProcessDirectory(ByVal targetDirectory As String)
        Dim fileEntries As String() = Directory.GetFiles(targetDirectory)
        ' Process the list of files found in the directory.
        Dim fileName As String
        For Each fileName In fileEntries          
            goread(fileName)
        Next fileName
        Dim subdirectoryEntries As String() = Directory.GetDirectories(targetDirectory)
        ' Recurse into subdirectories of this directory.
        Dim subdirectory As String
        For Each subdirectory In subdirectoryEntries
            ProcessDirectory(subdirectory)
        Next subdirectory

    End Sub 

''Here is the button click.Try whatever directory you want (it will search from 
' it's room and go for all the above directories.

 Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        ProcessDirectory("c:\MyRootDirectory")
        TextBox1.Text = intfilesize.ToString
    End Sub

I don't know if you can,must,will do conversions for int64,integer etc but the actual total file size number i tested is correct.

P.S. This is completely out of the blue API.I haven't found any solid code (for the goread function) so you must test and test and test.
P.S.2 Win7 have some files and dirs that cannot be accessed.I don't know what will happen but i suppose you can write something to skip them.
P.S.3. I lied( ) There is another method that you pass a streamreader.BaseStream.Length of a file.This method is known and is extremely slower than the other methods so i won't bother to post it.
P.S.4. I should put this in my signature for anyone interested...