Solved

Get a file size in Delphi ...

Posted on 2012-03-27
7
1,973 Views
Last Modified: 2012-06-21
Hi Experts,

I need some help, i downloaded some code from the internet that will allow me to get a file size.

The Size on disk is:                                 9.42 GB (10,123,444,224 bytes)
This is the size its bringing back:         1533509120

This is the code im using:

function TFunctions.FileSize(FileName: string): Int64;
var
SearchRec: TSearchRec;
begin
if FindFirst(FileName, faAnyFile, SearchRec) = 0 then                  // if found
   //SearchRec.Size property works, but only for files less than 2GB
   Result := Int64(SearchRec.FindData.nFileSizeHigh) shl Int64(32) +    // calculate the size
             Int64(SearchRec.FindData.nFileSizeLow)
else
   Result := 0;
FindClose(SearchRec);                                                   // close the find
end;

Thank you in advance.


Trevor
0
Comment
Question by:trevsoft
7 Comments
 
LVL 19

Expert Comment

by:Thommy
ID: 37775122
There's already an API function GetFileSize (unit windows)...

Check this link which shows and compares different ways for getting file size...
find the size of a file?
0
 
LVL 1

Author Comment

by:trevsoft
ID: 37775244
Hi Thommy,

Thanks for that, tried that code too, for some reason i get the same result.

is there a way to use ShellAPI to do this.

Im assuming thats what windows is using when you right click on a file and go properties.



Trevor
0
 
LVL 19

Expert Comment

by:Thommy
ID: 37775394
Following code determines drive cluster size and calculates size on disk...
Code is extracted from File size but size on Disk is required

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}


function FileSizeEx(const Filename: string; var AFileSize, ASizeOnDisk, AClusterSize: int64): boolean;

function GetClusterSize(Drive: Char): Longint;
var
  SectorsPerCluster,  
  BytesPerSector,
  dummy: Cardinal;
begin
  SectorsPerCluster := 0;
  BytesPerSector := 0;
  GetDiskFreeSpace( PChar(Drive + ':\'), SectorsPerCluster,
  BytesPerSector, dummy, dummy );

  result := SectorsPerCluster * BytesPerSector;
end;

var
  SR : TSearchRec;
  n : integer;
begin
  if FindFirst(Filename, faAnyFile, SR) = 0 then
    try
      AFileSize := SR.FindData.nFileSizeHigh;
      AFileSize := (AFileSize shl (4 *sizeof(AFileSize))) or SR.FindData.nFileSizeLow;

      AClusterSize := GetClusterSize( UpCase(Filename[1]) );

      n := AFileSize mod AClusterSize;
      if n > 0 then
        ASizeOnDisk := AFileSize +(AClusterSize -n)
      else
        ASizeOnDisk := AFileSize;

      result := true;
  finally
    FindClose(SR);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  AFileSize,  
  ASizeOnDisk,
  AClusterSize : int64;
  s: string;
begin
  s:='test.exe';
  if FileSizeEx(s, AFileSize, ASizeOnDisk, AClusterSize) then
  ShowMessage( s +#10+
    Format('File size: %.n bytes', [AFileSize *1.0]) +#10+
    Format('Size on disk: %.n bytes', [ASizeOnDisk *1.0]) +#10+
    Format('Cluster size: %.n bytes', [AClusterSize *1.0]) )
  else
    ShowMessage('FileSizeEx() FAILED');

end;

end.

Open in new window

0
Why are Office 365 signatures so complicated?

Trying to setup transport rules for Office 365 email signatures and can’t quite figure it out? Having to test the signature over and over? Make things simple by using Exclaimer Cloud - Signatures for Office 365.

 
LVL 9

Expert Comment

by:rinfo
ID: 37776117
Try this
function FileSize(const aFilename: String): Int64;
  var
    info: TWin32FileAttributeData;
  begin
    result := -1;

    if NOT GetFileAttributesEx(PWideChar(aFileName), GetFileExInfoStandard, @info) then
      EXIT;

    result := info.nFileSizeLow or (info.nFileSizeHigh shl 32);
  end;
0
 
LVL 37

Expert Comment

by:Geert Gruwez
ID: 37776121
also found this article for listing files
it did contain the same bug for file sizes
(and it got fixed)

http://www.delphiforfun.org/programs/Utilities/list_large_files.htm

code with the fixed filesize:
var
  F:TSearchrec;
  size:int64;
  fszhi,fszlo,m:int64;

        fszhi:=f.FindData.nfilesizehigh;
        fszlo:=f.FindData.nfilesizelow;
        m:=high(longword);
        inc(m,1);
        size:=fszhi*m+fszlo;

Open in new window

0
 
LVL 9

Expert Comment

by:rinfo
ID: 37776123
Pwidechar maynot work in newer delphi version  pchar has to be used for older version.
0
 
LVL 26

Accepted Solution

by:
Sinisa Vuk earned 500 total points
ID: 37841913
This is from most known - Rx lib - Fileutil.pas

function GetFileSize(const FileName: string): Int64;
var
  Handle: THandle;
  FindData: TWin32FindData;
begin
  Handle := FindFirstFile(PChar(FileName), FindData);
  if Handle <> INVALID_HANDLE_VALUE then begin
    Windows.FindClose(Handle);
    if (FindData.dwFileAttributes and FILE_ATTRIBUTE_DIRECTORY) = 0 then
    begin
      Int64Rec(Result).Lo := FindData.nFileSizeLow;
      Int64Rec(Result).Hi := FindData.nFileSizeHigh;
      Exit;
    end;
  end;
  Result := -1;
end;

Open in new window

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Today, still in the boom of Apple, PC's and products, nearly 50% of the computer users use Windows as graphical operating systems. If you are among those users who love windows, but are grappling to keep the system's hard drive optimized, then you s…
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
Windows 8 comes with a dramatically different user interface known as Metro. Notably missing from the new interface is a Start button and Start Menu. Many users do not like it, much preferring the interface of earlier versions — Windows 7, Windows X…
Windows 8 came with a dramatically different user interface known as Metro. Notably missing from that interface was a Start button and Start Menu. Microsoft responded to negative user feedback of the Metro interface, bringing back the Start button a…

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now