procedure generateJPEGfromBrowser(browser: iWebBrowser2; jpegFQFilename: String;
srcHeight: Integer; srcWidth: Integer; tarHeight: Integer; tarWidth: Integer);
var
sourceDrawRect : TRect;
targetDrawRect: TRect;
sourceBitmap: TBitmap;
targetBitmap: TBitmap;
jpeg: TJPEGImage;
viewObject: IViewObject;
begin
sourceBitmap := TBitmap.Create ;
targetBitmap := TBitmap.Create ;
jpeg := TJPEGImage.Create ;
try
try
sourceDrawRect := Rect(0,0, srcWidth , srcHeight );
sourceBitmap.Width :=  srcWidth ;
sourceBitmap.Height :=  srcHeight ;

viewObject := browser as IViewObject;

if viewObject = nil then
Exit;

OleCheck(viewObject.Draw(DVASPECT_CONTENT, 1, nil, nil, self.Handle,
sourceBitmap.Canvas.Handle, @sourceDrawRect, nil, nil, 0));

// Resize Bitmap
targetDrawRect := Rect(0,0, tarWidth, tarHeight);
targetBitmap.Height := tarHeight;
targetBitmap.Width := tarWidth;
targetBitmap.Canvas.StretchDraw(targetDrawRect, sourceBitmap);

// Create JPEG from Bitmap and save it
jpeg.Assign(targetBitmap) ;
makeFileWriteable(jpegFQFilename);
jpeg.SaveToFile (jpegFQFilename);
finally
jpeg.free;
sourceBitmap.free ;
targetBitmap.free;
end;
except
// errors
end;
end;

procedure ScanDir(StartDir, Mask: String; List: TStrings);
var
SearchRec: TSearchRec;
begin
if Mask = '' then Mask:= '*.*';
if StartDir[Length(StartDir)] <> '' then StartDir := StartDir + '';
if FindFirst(StartDir+Mask, faAnyFile, SearchRec) = 0 then
begin
repeat
Application.ProcessMessages;
if (SearchRec.Attr and faDirectory) <> faDirectory then
List.Add(StartDir + SearchRec.Name)
else if (SearchRec.Name <> '..') and (SearchRec.Name <> '.') then
ScanDir(StartDir + SearchRec.Name + '',Mask,List);
until FindNext(SearchRec) <> 0;
FindClose(SearchRec);
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
list: TStrings;
begin
list:= TStringList.Create;
ScanDir('c:', '*.txt', list);
Memo1.Lines:= list;
list.Free;
end;

type
TCodePage = (cpWin1251, cp866, cpKOI8R);
PMap = ^TMap;
TMap = array[#$80..#$FF] of Char;

function GetMap(CP: TCodePage): PMap;
{ должна возвращать указатель на таблицу перекодировки из CP в Windows1251
(nil для CP = cpWin1251) }
begin
GetMap := nil;
end;

function DetermineRussian(Buf: PChar; Count: Integer): TCodePage;
const
ModelBigrams: array[0..33, 0..33] of Byte = (
{АБВГДЕЖЗИЙКЛМHОПРСТУФХЦЧШЩЪЫЬЭЮЯ_?}
{А}(0, 20, 44, 12, 22, 23, 16, 60, 4, 9, 63, 93, 47, 110, 0, 16, 35, 61, 81,
1, 5, 13, 24, 17, 12, 4, 0, 0, 0, 0, 14, 31, 205, 1),
{Б}(19, 0, 0, 0, 4, 19, 0, 0, 8, 0, 2, 15, 1, 4, 41, 0, 15, 5, 0, 15, 0, 2,
1, 0, 0, 6, 16, 37, 0, 0, 0, 4, 3, 0),
{В}(97, 0, 1, 0, 2, 57, 0, 5, 40, 0, 4, 25, 2, 23, 78, 2, 8, 28, 4, 12, 0,
1, 0, 0, 8, 1, 0, 40, 1, 0, 0, 5, 106, 3),
{Г}(13, 0, 0, 0, 9, 5, 0, 0, 15, 0, 1, 17, 1, 2, 96, 0, 24, 0, 0, 7, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0),
{Д}(63, 0, 9, 1, 2, 71, 1, 0, 35, 0, 3, 16, 2, 22, 50, 2, 19, 9, 2, 25, 0,
2, 1, 0, 1, 0, 1, 9, 4, 0, 1, 5, 17, 4),
{Е}(4, 14, 15, 34, 56, 22, 13, 14, 2, 34, 39, 77, 73, 150, 6, 9, 101, 64,
81, 1, 0, 15, 5, 12, 10, 6, 0, 0, 0, 0, 3, 4, 235, 1),
{Ж}(13, 0, 0, 0, 12, 47, 0, 0, 16, 0, 1, 0, 0, 23, 0, 0, 0, 0, 0, 3, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2),
{З}(76, 2, 11, 3, 11, 4, 1, 0, 7, 0, 2, 4, 11, 24, 17, 0, 6, 1, 0, 8, 0, 0,
0, 0, 0, 0, 0, 16, 6, 0, 1, 4, 17, 0),
{И}(7, 9, 32, 5, 18, 60, 4, 42, 31, 27, 28, 46, 55, 49, 12, 7, 26, 60, 53,
0, 5, 25, 14, 28, 4, 1, 0, 0, 0, 0, 9, 56, 255, 0),
{Й}(0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 3, 0, 3, 0, 0, 0, 10, 3, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 0, 0, 0, 122, 0),
{К}(92, 0, 3, 0, 0, 7, 2, 1, 39, 0, 0, 27, 0, 14, 110, 0, 18, 5, 35, 18, 0,
0, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 5, 0),
{Л}(85, 1, 0, 2, 1, 70, 6, 0, 85, 0, 5, 3, 0, 9, 67, 1, 0, 9, 0, 15, 0, 0,
0, 2, 0, 0, 0, 9, 66, 0, 15, 43, 57, 4),
{М}(44, 0, 0, 0, 0, 65, 0, 0, 47, 0, 1, 1, 10, 15, 57, 7, 0, 2, 0, 24, 0, 0,
0, 0, 0, 0, 0, 28, 0, 0, 0, 8, 109, 3),
{}(139, 0, 0, 1, 11, 108, 0, 4, 152, 0, 7, 0, 1, 69, 161, 0, 0, 8, 25, 24,
5, 1, 5, 2, 0, 1, 0, 83, 10, 0, 1, 29, 38, 5),
{О}(0, 72, 139, 76, 74, 32, 32, 19, 12, 52, 21, 93, 68, 72, 7, 34, 93, 102,
98, 1, 2, 6, 6, 19, 15, 2, 0, 0, 0, 1, 4, 9, 252, 2),
{П}(17, 0, 0, 0, 0, 43, 0, 0, 14, 0, 1, 9, 0, 1, 125, 3, 120, 1, 2, 8, 0, 0,
0, 0, 0, 0, 0, 3, 6, 0, 0, 3, 2, 2),
{Р}(151, 1, 6, 4, 3, 103, 7, 0, 76, 0, 4, 0, 11, 10, 117, 1, 0, 5, 9, 39, 2,
5, 0, 1, 3, 0, 0, 24, 7, 0, 1, 10, 22, 5),
{С}(24, 1, 21, 0, 3, 39, 0, 0, 33, 0, 56, 41, 11, 15, 58, 30, 5, 30, 183,
16, 0, 4, 1, 4, 1, 0, 0, 8, 25, 0, 1, 50, 41, 2),
{Т}(83, 0, 43, 0, 3, 87, 0, 0, 71, 0, 9, 3, 2, 26, 180, 0, 55, 33, 1, 23, 1,
0, 1, 4, 0, 0, 0, 20, 78, 0, 0, 5, 82, 4),
{У}(3, 6, 7, 14, 19, 8, 13, 6, 0, 1, 13, 15, 10, 7, 0, 12, 17, 16, 19, 0, 1,
3, 0, 12, 5, 8, 0, 0, 0, 0, 22, 1, 65, 0),
{Ф}(4, 0, 0, 0, 0, 4, 0, 0, 11, 0, 0, 1, 0, 0, 9, 0, 3, 0, 0, 4, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 2, 0),
{Х}(9, 0, 2, 0, 0, 2, 0, 0, 5, 0, 0, 1, 0, 5, 26, 0, 4, 1, 0, 1, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 76, 0),
{Ц}(5, 0, 0, 0, 0, 16, 0, 0, 48, 0, 1, 0, 0, 0, 4, 0, 0, 0, 0, 3, 0, 0, 0,
0, 0, 0, 0, 2, 0, 0, 0, 0, 3, 0),
{Ч}(30, 0, 0, 0, 0, 52, 0, 0, 23, 0, 3, 1, 0, 14, 1, 0, 0, 0, 36, 5, 0, 0,
0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 2),
{Ш}(13, 0, 0, 0, 0, 28, 0, 0, 17, 0, 4, 4, 0, 4, 3, 0, 0, 0, 1, 3, 0, 0, 0,
0, 0, 0, 0, 0, 3, 0, 0, 0, 1, 1),
{Щ}(6, 0, 0, 0, 0, 23, 0, 0, 16, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1),
{Ъ}(0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1, 1, 0, 0),
{Ы}(0, 5, 14, 1, 3, 28, 0, 2, 0, 22, 6, 19, 21, 2, 0, 5, 4, 7, 10, 0, 0, 37,
0, 3, 4, 0, 0, 0, 0, 0, 0, 1, 84, 0),
{Ь}(0, 1, 0, 0, 0, 9, 0, 10, 1, 0, 13, 0, 2, 26, 0, 0, 0, 10, 3, 0, 0, 0, 1,
0, 6, 0, 0, 0, 0, 0, 6, 4, 117, 0),
{Э}(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 0, 31, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
{Ю}(0, 5, 0, 0, 3, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 15, 0, 0, 0, 1, 4,
1, 15, 0, 0, 0, 0, 0, 0, 38, 0),
{Я}(0, 0, 9, 2, 7, 10, 3, 19, 0, 0, 1, 6, 7, 8, 0, 0, 2, 6, 19, 0, 0, 3, 5,
1, 0, 3, 0, 0, 0, 0, 5, 2, 177, 0),
{_}(42, 80, 193, 43, 109, 41, 18, 53, 159, 0, 144, 27, 83, 176, 187, 229,
70, 231, 99, 47, 15, 13, 6, 58, 7, 0, 0, 0, 0, 38, 0, 22, 0, 2),
{?}(0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 2, 4, 4, 8, 0, 0, 5, 3, 4, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0));
{ " рейтинг"  буквы ? условно принимается равным 1/20 от " рейтинга"  буквы E,
если сочетание с участием ? корректно, иначе - 0 }
type
TVariation = array[0..33, 0..33] of Integer;
var
I, J, iC, iPredC, Max: Integer;
C: Char;
CP: TCodePage;
D, MinD, Factor: Double;
AMap: PMap;
PV: ^TVariation;
Vars: array[TCodePage] of TVariation;
begin
DetermineRussian := cpWin1251; { по yмолчанию }
{ вычисление распределений биграмм }
FillChar(Vars, SizeOf(Vars), 0);
for CP := Low(Vars) to High(Vars) do
begin
AMap := GetMap(CP);
PV := @Vars[CP];
iPredC := 32;
for I := 0 to Count - 1 do
begin
C := Buf[I];
iC := 32;
if C > = #128 then
begin
if AMap < > nil then
C := AMap^[C];
if not (C in ['?', '?']) then
begin
C := Chr(Ord(C) and not 32); { 'a'..'я' ->  'А'..'Я' }
if C in ['А'..'Я'] then
iC := Ord(C) - Ord('А');
end
else
iC := 33;
end;
Inc(PV^[iPredC, iC]);
iPredC := iC;
end;
end;
{ вычисление метрики и определение наиболее правдоподобной кодировки }
MinD := 0;
for CP := Low(Vars) to High(Vars) do
begin
PV := @Vars[CP];
PV^[32, 32] := 0;
Max := 1;
for I := 0 to 33 do
for J := 0 to 33 do
if PV^[I, J] > Max then
Max := PV^[I, J];
Factor := 255 / Max; { ноpмализация }
D := 0;
for I := 0 to 33 do
for J := 0 to 33 do
D := D + Abs(PV^[I, J] * Factor - ModelBigrams[I, J]);
if (MinD = 0) or (D < MinD) then
begin
MinD := D;
DetermineRussian := CP;
end;
end;
end;

begin
{ тест: слово 'Пример' в разных кодировках (веpоятность ошибок на таких
коpотких текстах высока - в данном слyчае пpосто повезло!) }
writeln(DetermineRussian(#$CF#$F0#$E8#$EC#$E5#$F0, 6) = cpWin1251);
writeln(DetermineRussian(#$8F#$E0#$A8#$AC#$A5#$E0, 6) = cp866);
writeln(DetermineRussian(#$F0#$D2#$C9#$CD#$C5#$D2, 6) = cpKOI8R);
readln;
end.

uses Math;

// Прибавляешь 0.5 затем округляешь:

function RoundMax(Num: real; prec: integer): real;
begin
result := roundto(num + Power(10, prec - 1) * 5, prec);
end;

// До сотых соответственно будет:

function RoundMax100(Num: real): real;
begin
result := round(num * 100 + 0.5) / 100;
end;