File Size

[anixon 0]

FileGetSize(Test.txt) produces a size of 383 byte which is the value in the files properties however the Size on disc is 4096 bytes so my question is how do I either read or calculate the size on disc for any given file? Ant..

[AndyG 29]

A Script made by the absolutely great AutoIt-Scriptomatic tool: 

"Bytes per Sector " is what you need...

expandcollapse popup

; Generated by AutoIt Scriptomatic

$wbemFlagReturnImmediately = 0x10
$wbemFlagForwardOnly = 0x20
$colItems = ""
$strComputer = "localhost"

$Output=""
$Output = $Output & "Computer: " & $strComputer  & @CRLF
$Output = $Output & "==========================================" & @CRLF
$objWMIService = ObjGet("winmgmts:\\" & $strComputer & "\root\CIMV2")
$colItems = $objWMIService.ExecQuery("SELECT * FROM Win32_DiskDrive", "WQL", _
                                          $wbemFlagReturnImmediately + $wbemFlagForwardOnly)

If IsObj($colItems) then
   For $objItem In $colItems
      $Output = $Output & "Availability: " & $objItem.Availability & @CRLF
      $Output = $Output & "BytesPerSector: " & $objItem.BytesPerSector & @CRLF
      $strCapabilities = $objItem.Capabilities(0)
      $Output = $Output & "Capabilities: " & $strCapabilities & @CRLF
      $strCapabilityDescriptions = $objItem.CapabilityDescriptions(0)
      $Output = $Output & "CapabilityDescriptions: " & $strCapabilityDescriptions & @CRLF
      $Output = $Output & "Caption: " & $objItem.Caption & @CRLF
      $Output = $Output & "CompressionMethod: " & $objItem.CompressionMethod & @CRLF
      $Output = $Output & "ConfigManagerErrorCode: " & $objItem.ConfigManagerErrorCode & @CRLF
      $Output = $Output & "ConfigManagerUserConfig: " & $objItem.ConfigManagerUserConfig & @CRLF
      $Output = $Output & "CreationClassName: " & $objItem.CreationClassName & @CRLF
      $Output = $Output & "DefaultBlockSize: " & $objItem.DefaultBlockSize & @CRLF
      $Output = $Output & "Description: " & $objItem.Description & @CRLF
      $Output = $Output & "DeviceID: " & $objItem.DeviceID & @CRLF
      $Output = $Output & "ErrorCleared: " & $objItem.ErrorCleared & @CRLF
      $Output = $Output & "ErrorDescription: " & $objItem.ErrorDescription & @CRLF
      $Output = $Output & "ErrorMethodology: " & $objItem.ErrorMethodology & @CRLF
      $Output = $Output & "Index: " & $objItem.Index & @CRLF
      $Output = $Output & "InstallDate: " & WMIDateStringToDate($objItem.InstallDate) & @CRLF
      $Output = $Output & "InterfaceType: " & $objItem.InterfaceType & @CRLF
      $Output = $Output & "LastErrorCode: " & $objItem.LastErrorCode & @CRLF
      $Output = $Output & "Manufacturer: " & $objItem.Manufacturer & @CRLF
      $Output = $Output & "MaxBlockSize: " & $objItem.MaxBlockSize & @CRLF
      $Output = $Output & "MaxMediaSize: " & $objItem.MaxMediaSize & @CRLF
      $Output = $Output & "MediaLoaded: " & $objItem.MediaLoaded & @CRLF
      $Output = $Output & "MediaType: " & $objItem.MediaType & @CRLF
      $Output = $Output & "MinBlockSize: " & $objItem.MinBlockSize & @CRLF
      $Output = $Output & "Model: " & $objItem.Model & @CRLF
      $Output = $Output & "Name: " & $objItem.Name & @CRLF
      $Output = $Output & "NeedsCleaning: " & $objItem.NeedsCleaning & @CRLF
      $Output = $Output & "NumberOfMediaSupported: " & $objItem.NumberOfMediaSupported & @CRLF
      $Output = $Output & "Partitions: " & $objItem.Partitions & @CRLF
      $Output = $Output & "PNPDeviceID: " & $objItem.PNPDeviceID & @CRLF
      $strPowerManagementCapabilities = $objItem.PowerManagementCapabilities(0)
      $Output = $Output & "PowerManagementCapabilities: " & $strPowerManagementCapabilities & @CRLF
      $Output = $Output & "PowerManagementSupported: " & $objItem.PowerManagementSupported & @CRLF
      $Output = $Output & "SCSIBus: " & $objItem.SCSIBus & @CRLF
      $Output = $Output & "SCSILogicalUnit: " & $objItem.SCSILogicalUnit & @CRLF
      $Output = $Output & "SCSIPort: " & $objItem.SCSIPort & @CRLF
      $Output = $Output & "SCSITargetId: " & $objItem.SCSITargetId & @CRLF
      $Output = $Output & "SectorsPerTrack: " & $objItem.SectorsPerTrack & @CRLF
      $Output = $Output & "Signature: " & $objItem.Signature & @CRLF
      $Output = $Output & "Size: " & $objItem.Size & @CRLF
      $Output = $Output & "Status: " & $objItem.Status & @CRLF
      $Output = $Output & "StatusInfo: " & $objItem.StatusInfo & @CRLF
      $Output = $Output & "SystemCreationClassName: " & $objItem.SystemCreationClassName & @CRLF
      $Output = $Output & "SystemName: " & $objItem.SystemName & @CRLF
      $Output = $Output & "TotalCylinders: " & $objItem.TotalCylinders & @CRLF
      $Output = $Output & "TotalHeads: " & $objItem.TotalHeads & @CRLF
      $Output = $Output & "TotalSectors: " & $objItem.TotalSectors & @CRLF
      $Output = $Output & "TotalTracks: " & $objItem.TotalTracks & @CRLF
      $Output = $Output & "TracksPerCylinder: " & $objItem.TracksPerCylinder & @CRLF
      if Msgbox(1,"WMI Output",$Output) = 2 then ExitLoop
      $Output=""
   Next
Else
   Msgbox(0,"WMI Output","No WMI Objects Found for class: " & "Win32_DiskDrive" )
Endif


Func WMIDateStringToDate($dtmDate)

    Return (StringMid($dtmDate, 5, 2) & "/" & _
    StringMid($dtmDate, 7, 2) & "/" & StringLeft($dtmDate, 4) _
    & " " & StringMid($dtmDate, 9, 2) & ":" & StringMid($dtmDate, 11, 2) & ":" & StringMid($dtmDate,13, 2))
EndFunc

[Ascend4nt 117]

Delving into 'Undocumented' territory, here's a simple way to get it:

#include <WinAPI.au3>

; Author: Ascend4nt

Func _FileGetSizeOnDisk($sFilename)
    Local $aRet,$hFile,$iErr
    $hFile=_WinAPI_CreateFile($sFilename,2,2,6)
    If $hFile=0 Then Return SetError(-1,@error,-1)
    Local $stStandInfo=DllStructCreate("uint64;uint64;ulong;boolean;boolean"),$stIOStatusBlock=DllStructCreate("ulong_ptr;ulong_ptr")
    $aRet=DllCall("ntdll.dll","long","NtQueryInformationFile","handle",$hFile,"ptr",DllStructGetPtr($stIOStatusBlock),"ptr",DllStructGetPtr($stStandInfo),"ulong",DllStructGetSize($stStandInfo),"ulong",5)
    $iErr=@error
    _WinAPI_CloseHandle($hFile)
    If $iErr Then Return SetError(2,$iErr,-1)
    If $aRet[0] Then Return SetError(6,$aRet[0],-1)
    Return DllStructGetData($stStandInfo,1)
EndFunc
$sFile=@SystemDir&"\user32.dll"
ConsoleWrite("FileSize:"&FileGetSize($sFile)&", Allocation size:"&_FileGetSizeOnDisk($sFile)&", @error="&@error&", @extended="&@extended&@CRLF)

*edit: added NTSTATUS check

Edited August 25, 2010 by Ascend4nt

[Yashied 194]

What are the reasons to use an undocumented function?

$FileSizeOnDisk = Ceiling($FileSize / $ClusterSize) * $ClusterSize

Func _FileGetSizeOnDisk($sFile)

    Local $aRet, $tPath, $Bytes

    $tPath = DllStructCreate('wchar[260]')
    $aRet = DllCall('shlwapi.dll', 'int', 'PathSearchAndQualifyW', 'wstr', StringStripWS($sFile, 7), 'ptr', DllStructGetPtr($tPath), 'int', 260)
    If @error Then
        Return SetError(1, 0, 0)
    EndIf
    $sFile = DllStructGetData($tPath, 1)
    $aRet = DllCall('kernel32.dll', 'int', 'GetDiskFreeSpaceW', 'wstr', StringLeft($sFile, 2), 'dword*', 0, 'dword*', 0, 'dword*', 0, 'dword*', 0)
    If (@error) Or (Not $aRet[0]) Then
        Return SetError(1, 0, 0)
    EndIf
    $Bytes = $aRet[2] * $aRet[3]
    Return Ceiling(FileGetSize($sFile) / $Bytes) * $Bytes
EndFunc   ;==>_FileGetSizeOnDisk

[Ascend4nt 117]

Actually most every 'undocumented' API function that I use are documented in some form or another on MSDN. The above function NtQueryInformationFile can be found listed under ZwQueryInformationFile. The difference is 'Nt' is supposed to be called from user mode.

[anixon 0]

I would like to thank everyone for their contribution which is very much appreciated Ant..

[anixon 0]

What are the reasons to use an undocumented function?

$FileSizeOnDisk = Ceiling($FileSize / $ClusterSize) * $ClusterSize

Func _FileGetSizeOnDisk($sFile)

    Local $aRet, $tPath, $Bytes

    $tPath = DllStructCreate('wchar[260]')
    $aRet = DllCall('shlwapi.dll', 'int', 'PathSearchAndQualifyW', 'wstr', StringStripWS($sFile, 7), 'ptr', DllStructGetPtr($tPath), 'int', 260)
    If @error Then
        Return SetError(1, 0, 0)
    EndIf
    $sFile = DllStructGetData($tPath, 1)
    $aRet = DllCall('kernel32.dll', 'int', 'GetDiskFreeSpaceW', 'wstr', StringLeft($sFile, 2), 'dword*', 0, 'dword*', 0, 'dword*', 0, 'dword*', 0)
    If (@error) Or (Not $aRet[0]) Then
        Return SetError(1, 0, 0)
    EndIf
    $Bytes = $aRet[2] * $aRet[3]
    Return Ceiling(FileGetSize($sFile) / $Bytes) * $Bytes
EndFunc   ;==>_FileGetSizeOnDisk

I took the liberty of modifying your code to calculate KB or MB as the case may be hope you don't mind.. Ant

;//Calculate Distribution File Size
Func _FileGetSizeOnDisk($sFile)
    Local $aRet, $tPath, $Bytes
    $tPath = DllStructCreate('wchar[260]')
    $aRet = DllCall('shlwapi.dll', 'int', 'PathSearchAndQualifyW', 'wstr', StringStripWS($sFile, 7), 'ptr', DllStructGetPtr($tPath), 'int', 260)
    If @error Then
        Return SetError(1, 0, 0)
    EndIf
    $sFile = DllStructGetData($tPath, 1)
    $aRet = DllCall('kernel32.dll', 'int', 'GetDiskFreeSpaceW', 'wstr', StringLeft($sFile, 2), 'dword*', 0, 'dword*', 0, 'dword*', 0, 'dword*', 0)
    If (@error) Or (Not $aRet[0]) Then
        Return SetError(1, 0, 0)
    EndIf
    $Bytes = $aRet[2] * $aRet[3]
    $sDistributionCal = Ceiling(FileGetSize($sFile) / $Bytes) * $Bytes)
 ;//Calculate the KB Value
 $sDistributionSize = StringFormat("%0.2f", $sDistributionCal / 1024) & " KB"
 ;//Calculate the MB Value if Bytes >= 1048576
 If $sDistributionCal >= 1048576 Then $sDistributionSize = StringFormat("%0.2f", $sDistributionCal / 1048576) & " MB"
EndFunc   ;==>_FileGetSizeOnDisk