Delphi 2010 Copy 1 file to 15 usb devices at once with progress.

You would need to do it in a thread.

I don't have the time right now for sample code but this seems good for now: http://stackoverflow.com/questions/1766626/copy-file-in-a-thread

Yap, you have to run each copy process in a thread.
The question is, will you get any significant improvements in performance. All threads will have to read from the disk at the same time

Unless the file to be written is in memory.

Well as the harddisk is fast and the usb device's (cheap ones have a slow write speed ) it should improve.

I have zero experience with threading sadly,

I am using the following code for copying currently which i found om some site:

function CopyFileWithProgressBar2(TotalFileSize,
  TotalBytesTransferred,
  StreamSize,
  StreamBytesTransferred: LARGE_INTEGER;
  dwStreamNumber,
  dwCallbackReason: DWORD;
  hSourceFile,
  hDestinationFile: THandle;
  lpData: Pointer): DWORD; stdcall;
begin
  // just set size at the beginning
  if dwCallbackReason = CALLBACK_STREAM_SWITCH then
    TProgressBar(lpData).Max := (TotalFileSize.QuadPart div 1000);

  TProgressBar(lpData).Position := (TotalBytesTransferred.QuadPart div 1000);
  Application.ProcessMessages;
  Result := PROGRESS_CONTINUE;
end;

function tfrmMain.CopyWithProgress(sSource, sDest: string): Boolean;
begin
  // set this FCancelled to true, if you want to cancel the copy operation
  bCancelCopy := False;
  Result     := CopyFileEx(PChar(sSource), PChar(sDest), @CopyFileWithProgressBar2,
    ProgressBar1, @bCancelCopy, 0);
end;

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So how do i put this in 15 thread's  (the omnithread library looks promising) and  have them update 15 progress bars on a form, also the user has to be able to cancel the copy progress like they can in the above code.?

The source harddisk will be a solid state disk so it should provide enough read speed to supply 15 usb drives who have a max write speed of 2Mbyte/s.

If there isn't a working solution by tonight (or tomorrow morning) I'll do some sample code for you.

hi

I have made you simple application that copies source file to destination drives using multi-threading.
 

unit Unit1;

interface

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

type
  TFasterThread = class(TThread)
  private
    FPath: string;
    FProgressBar:TProgressBar;
    FCurrentPosition: integer;
    FCurrentPercent: Integer;
    FMaxPosition: integer;
  protected
  procedure CopyFileToDrives(Source, Destination: string);
  procedure Execute; override;
  procedure DoProgress;
  procedure SetProgress;
  public
    constructor Create(const APath: string; ApgbProgress:TProgressbar);
    destructor Destroy; override;
  end;

  TForm1 = class(TForm)
    CheckListBox1: TCheckListBox;
    Button1: TButton;
    Button2: TButton;
    OpenDialog1: TOpenDialog;
    Button3: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    procedure ShowDrives;
  private
    FThreadList: TList;
    procedure ThreadTerminated(ASender: TObject);
  public
  end;

var
  Form1: TForm1;
  SourceFile: String;

implementation
{$R *.dfm}


{ Thread }
constructor TFasterThread.Create(const APath: string; ApgbProgress:TProgressbar);
begin
  inherited Create(True);
  FPath:= APath;
  FProgressbar := ApgbProgress;
end;

destructor TFasterThread.Destroy;
begin
  inherited;
end;

procedure TFasterThread.SetProgress;
begin
  FProgressBar.Max := FMaxPosition;
end;

procedure TFasterThread.DoProgress;
begin
  FProgressBar.Position := FCurrentPosition;
end;

procedure TFasterThread.Execute;
var fonly:string;
begin
if SourceFile='' then exit;
fonly:=ExtractFileName(SourceFile);
  try
    CopyFileToDrives(SourceFile, FPath + fonly);
  except
  end;
end;

procedure TFasterThread.CopyFileToDrives(Source, Destination: string);
const
bufSize = 16384;
var
sStream,dStream:TFileStream;
totCnt,strmSize:LongInt;
pBuf: Pointer;
cnt: Integer;
begin
totCnt := 0;
sStream := TFileStream.Create(Source, fmOpenRead or fmShareDenyWrite);
strmSize := sStream.size;
FMaxPosition:= strmSize;
Synchronize(SetProgress);
try
dStream := TFileStream.Create(Destination, fmCreate or fmShareExclusive);
try
GetMem(pBuf, bufSize);
cnt := sStream.Read(pBuf^, bufSize);
cnt := dStream.Write(pBuf^, cnt);
totCnt := totCnt + cnt;
while (cnt > 0) do begin
Application.ProcessMessages;
cnt := sStream.Read(pBuf^, bufSize);
cnt := dStream.Write(pBuf^, cnt);
totcnt := totcnt + cnt;
FCurrentPercent := Round((totCnt / strmSize) * 100);
FCurrentPosition := dStream.Size;
Synchronize(DoProgress);
end;
finally
FreeMem(pBuf, bufSize);
dStream.Free;
end;
finally
sStream.Free;
end;
end;

{ TForm1 }
procedure TForm1.ShowDrives;
var
  Drive: Char;
  i: Integer;
  pgbProgress: TProgressbar;
begin
  for i:= 0 to CheckListBox1.Count-1 do
  begin
    CheckListBox1.Items.Objects[i].Free;
    CheckListBox1.Items.Objects[i]:= nil;
  end;
  CheckListBox1.Clear;
  for Drive := 'A' To 'Z' Do
  begin
    if (GetDriveType(PChar(Drive + ':\'))= DRIVE_FIXED) OR (GetDriveType(PChar(Drive + ':\'))= DRIVE_REMOVABLE) then
    begin
      pgbProgress:= TProgressbar.Create(Self);
      CheckListBox1.Items.AddObject(Format('%s:\',[Drive]),  pgbProgress );
      pgbProgress.Left:= CheckListBox1.Left + CheckListBox1.Width + 1;
      pgbProgress.Top:= CheckListBox1.Top + CheckListBox1.ItemRect( CheckListBox1.Count-1 ).Top;
      Self.InsertControl( pgbProgress );
    end;
 end;
end;


procedure TForm1.ThreadTerminated(ASender: TObject);
begin
  FThreadList.Remove( Pointer(ASender) );
  if FThreadList.Count = 0 then
  begin
    Button1.Enabled:= True;
    Button2.Enabled:= False;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FThreadList:= TList.Create;
  ShowDrives;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FreeAndNil(FThreadList);
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
var i:integer;
begin
  if FThreadList.Count <= 0 then exit;
  if (MessageBox(0, 'Would you like to close form and break?', 'Not finished Yet', MB_ICONQUESTION or MB_YESNOCANCEL) = idYes) then
  begin
  for i:= 0 to FThreadList.Count-1 do
  begin
  TThread(FThreadList[i]).Terminate;
  end;
  Action:= caFree;
  end
  else
    Action:= caNone;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
  Thread: TFasterThread;
  checked:boolean;
begin
if SourceFile='' then exit;
for i:= 0 to CheckListbox1.Count-1 do begin
checked := CheckListbox1.Checked[i];
if Checked then break;
end;
if not Checked then exit;
Button2.Enabled := True;
  if CheckListbox1.Count >=0 then
  begin
    Button1.Enabled:= False;
    for i :=0 to CheckListbox1.count-1  do
    begin
      if CheckListBox1.Checked[i] then
      begin
        Thread:= TFasterThread.Create( CheckListBox1.Items[i], TProgressbar(CheckListBox1.Items.Objects[i]));
        FThreadList.Add( Pointer(Thread) );
        Thread.FProgressBar.Min := 0;
        Thread.FProgressBar.Position := 0;
        Thread.OnTerminate:= ThreadTerminated;
        Thread.FreeOnTerminate:= True;
        Thread.Resume;
      end;
    end;

  end;
end;


procedure TForm1.Button2Click(Sender: TObject);
var
  i: Integer;
begin
if Button2.Caption = 'Pause' then
begin
  if FThreadList.Count <=0 then exit;
  for i:= 0 to FThreadList.Count-1 do TThread(FThreadList[i]).Suspend;
  Button2.Caption := 'Resume';
end
else
begin
  if FThreadList.Count > 0 then
  for i:= 0 to FThreadList.Count-1 do TThread(FThreadList[i]).Resume;
  Button2.Caption := 'Pause';
end;
end;


procedure TForm1.Button3Click(Sender: TObject);
begin
if OpenDialog1.Execute then
SourceFile := OpendiaLog1.FileName;
Form1.Caption  := 'SOURCE filename is: ['+ExtractFileName(SourceFile)+']';
end;

end.

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I also attached the file.
 ThreadCopyFiles.zip

Very nice exactly what i needed.

Here's the main app;
https://www.experts-exchange.com/blogs/systan/B_3494-Copy-File-to-Multiple-drives.html

copying multiple files at once is bogus if you have only 1 network card and 1 disc controller

take the smallest number of controllers you have:
1 disc controller
1 network
1 usb

attach all devices to those controllers
2 discs to 1 disc controller
15 servers to a hub to the network controller on the pc
15 usb sticks to the 1 usb controller

copy 15 files simultaneously will all have to done by 1 controller in each section

you need to look at load balancing by the controller ... i don't do such low level programming

>>i don't do such low level programming
were all learning each day, and each day we forgot we don't noticed it.