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# Convert Int64 to Int32 (Integer) ?

Posted on 2011-09-25
Medium Priority
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Last Modified: 2016-09-29
Is it possible to convert int64 to in32 in delphi ?
0
Question by:rotem156
2 Comments

LVL 39

Assisted Solution

Geert G earned 1000 total points
ID: 36707476
calculate the percentage of the completion ... a lot easier for the progressbar
you only get numbers from 0 to 100
0

LVL 25

Accepted Solution

epasquier earned 1000 total points
ID: 36707917
first, use 1Gb parts, it will be a lot easier.

``````procedure Split1GoParts(TotalSize:Int64;Var NbFullParts,LastIncompletePartSize:Integer):
begin
NbFullParts:=TotalSize SHR 30;
LastIncompletePartSize:=TotalSize And \$3FFFFFFF;
end;
``````

then,in your thread Create, instead of using an EndOffset, use a Part Size to download (Integer).
You'll end up with a much cleaner thread code and an easier way to create those threads (only ONE int64 value is needed, the offset):
Somewhere in your code you'll have to use what Split1GoParts returns :

``````PartSize:=1 SHL 30;
for i:=0 to NbFullParts-1 do
CreateThread ( alabel[I], apbar[I], hOpenFile[I], hInetFile[I], i*PartSize, PartSize);
``````
Where CreateThread function is of course something that creates the thread and add it to your manager.
``````TFetchDataThread = class(TThread)
private
FStartOffset    : Int64;
FPartSize       : Integer;
FInetFile       : HINTERNET;
FDestFile       : THandle;
FProgressBar    : TProgressBar;
FLabelProgress  : TLabel;
FLoadedSize     : Integer;
procedure ProgressGui;
protected
procedure Execute; override;
public
constructor Create(
LabelProgress : TLabel;
Progress      : TProgressBar;
DestFile      : THandle;
InetFile      : HINTERNET;
StartOffset  : Int64;
PartSize    : Integer);
destructor Destroy;
end;

constructor TFetchDataThread.Create(
LabelProgress: TLabel;
Progress     : TProgressBar;
DestFile     : THandle;
InetFile     : HINTERNET;
StartOffset  : Int64;
PartSize    : Integer);
begin
FStartOffset    := StartOffset;
FPartSize       := PartSize;
//  FEndOffset      := EndOffset;
FInetFile       := InetFile;
FDestFile       := DestFile;
FProgressBar    := Progress;
FLabelProgress  := LabelProgress;
inherited Create( {DAPClass.UpdateProgressBar,} False );
end;

procedure TFetchDataThread.ProgressGui;
begin
FProgressBar.Value := FLoadedSize;
FProgressBar.Repaint; // Avoid gui problems
FLabelProgress.Text :=
Format( 'Thread: %d, Start Offset: %d (%x h), Loaded %d / %d (%f %%)',
[ThreadID, FStartOffset, FStartOffset, FLoadedSize, FPartSize, 100*FLoadedSize/FPartSize ] );
end;

procedure TFetchDataThread.Execute;
type
TypeByteArray = array [1..1024*2] of Byte;
var
Buffer            : TypeByteArray;
BytesToReadWrite,
BufferLen,
BytesWritten,
begin
FreeOnTerminate := True;
FProgressBar.Min :=  0;
FProgressBar.Max :=  FPartSize;
InternetSetFilePointer( FInetFile, FStartOffset, nil, FILE_BEGIN, 0 );
SetFilePointer( FDestFile, FStartOffset, nil, FILE_BEGIN );
try
repeat
BytesToReadWrite := FPartSize - FLoadedSize;
if BytesToReadWrite > SizeOf( Buffer )
Then BytesToReadWrite  := SizeOf( Buffer )

InternetReadFile( FInetFile, @Buffer, BytesToReadWrite, BufferLen );

LockFile( FDestFile, FStartOffset, 0, BytesToReadWrite, 0 );
WriteFile( FDestFile, Buffer, BytesToReadWrite, BytesWritten, nil );
UnlockFile( FDestFile, FStartOffset, 0, BytesToReadWrite, 0 );
Inc(FLoadedSize,BytesWritten);

Synchronize( ProgressGui );

// Why reducing CPU in the download thread ? it will just slow down everything.
//    Sleep( Random( 15 ) ); // Avoid cpu usage
until (FLoadedSize>=FPartSize) or (Terminated);
finally
CloseHandle( FDestFile );
InternetCloseHandle( FInetFile );
end;
end;
``````
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