파란크리스마스

출처 - http://cc.embarcadero.com/Item/26667

DCocoR 예제를 간단하게 수정하여 만들어 보았습니다.

expr.7z

FRAME "delphi.frm"

header = (.
.)

uses = (.SysUtils,Variants,StrUtils.)

private = (.
.)
protected = (.
.)
public = (.
  function Evaluate(const str: String): integer;
.)
publicProps = (.
.)

precreate = (.
.)

implementation =
(.
function TExprUnit.Evaluate(const str: String): integer;
var rez: Variant;
begin
  SetSource(str);
  _expr(rez);
  //Result := Successful and rez;
  Result := rez;
end;
.)

END

IGNORECASE

CHARACTERS
letter="ABCDEFGHIJKLMNOPQRSTUVWXYZ_".
digit="0123456789".
hexdigit = digit + "ABCDEF".
special = "+-*/=<>[].,():;^@{}$#".
ctrl=CHR(1)..CHR(31).
tab=CHR(9).
eol=CHR(13).
lf=CHR(10).
noquote=ANY-"'" -ctrl.

TOKENS
ident = letter{letter|digit}.
number = digit{digit} | digit { digit } CONTEXT ( ".." ).
string = ("'" {noquote}"'"| "#"(digit{digit}|"$"hexdigit{hexdigit}))
         {"'" {noquote}"'"| "#"(digit{digit}|"$"hexdigit{hexdigit})}.
float = digit{digit}
        (  "." {digit}
           [ "E"
            ["+" |"-"]
            digit{digit}
           ]
          |"E"["+"|"-"]digit{digit}
        ).
hexnumber = "$" hexdigit {hexdigit}.
eq    = '='.
gr    = '>'.
les   = '<'.
lesEq = '<='.
grEq  = '>='.
noeq  = '<>'.

add = "+". 
sub = "-". 
or  = "OR".
xor = "XOR".

mult = "*"  .
divd = "/"  .
div  = "DIV".
mod  = "MOD".
and  = "AND".
shl  = "SHL".
shr  = "SHR".

IGNORE tab+lf+eol

PRODUCTIONS

ExprUnit
(. var rez: Variant; .)=
 expr<rez>
.

expr<var Value: Variant>
(. var v2: Variant; sign: Integer; AddOp: Integer; .) =
  (.sign := 1;.)
  ['+' | '-' (.sign := -1;.) ]
  Term<Value> (. if sign<0 then value := -value;.)
  {
   ( "+" | "-" | "OR" | "XOR" )
   (. AddOp := Symbols[0]^.id; .)
    Term<v2>
   (. case AddOp of
      addSym: Value := Value +   v2;
      subSym: Value := Value -   v2;
      orSym : Value := Value or  v2;
      xorSym: Value := Value xor v2;
      end;
   .)
  }
.

Term<var Value: Variant>
(. var v2: Variant; MulOp: Integer; .) =
 Factor<Value>
 {
  ("*" | "/" | "DIV" | "MOD" | "AND" | "SHL" | "SHR" )
  (. MulOp := Symbols[0]^.id; .)
  Factor<v2>
   (. case MulOp of
      multSym: Value := Value *   v2;
      divdSym: Value := Value /   v2;
      divSym:  Value := Value div v2;
      modSym:  Value := Value mod v2;
      andSym:  Value := Value and v2;
      shlSym:  Value := Value shl v2;
      shrSym:  Value := Value shr v2;
      end;
   .)
 }
.

Factor<var Value: Variant> =
 | Number<Value>
.

Number<out Value: Variant> =
   number     (. Value := StrToInt(LexString); .)
 | float      (. Value := StrToFloat(LexString); .)
 | hexnumber  (. Value := StrToInt(LexString); .)
.

END ExprUnit.
----------------------------------------

ExprApp.dpr
----------------------------------------
program ExprApp;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  CocoAncestor,
  FileLoader,
  ExprUnit in 'ExprUnit.pas';

var
  comp: TExprUnit;
  meth: TMethod;
  errProc: TErrorEvent absolute meth;
  int1: String;
  rez: Variant;

procedure ErrorHandler(this: TExprUnit; Sender: TObject; ErrorType,ErrorCode, line,col: Integer; const Msg, data: string);
begin
  WriteLn(Format('Error in "%s"(%d,%d): %s',[int1,Line,Col,Msg,data]));
end;

begin
  try
    if (ParamCount=0) then begin
      WriteLn(Format('Usage: %s "1 + 2"',[ChangeFileExt(ExtractFileName(ParamStr(0)),'')]));
      Exit;
    end;
    comp := TExprUnit.Create(nil);
    try
      meth.Data := comp;
      meth.Code := @ErrorHandler;
      comp.OnError := errProc;

      int1 := ParamStr(1);
      WriteLn(int1);
      rez := comp.Evaluate(int1);
      WriteLn(rez);
    finally
      comp.Free;
    end;
  except
    on E:Exception do
      Writeln(E.Classname, ': ', E.Message);
  end;
end.
----------------------------------------

실행결과

FileCopy

출처 : http://delphi.about.com/od/fileio/a/untypedfiles.htm

procedure FileCopy(const FileFrom, FileTo: string) ;
var
  FromF, ToF: file;
  NumRead, NumWritten: Integer;
  Buffer: array[1..2048] of Byte;
begin
  AssignFile(FromF, FileFrom) ;
  Reset(FromF, 1) ;
  AssignFile(ToF, FileTo) ;
  Rewrite(ToF, 1) ;
  repeat

   BlockRead(FromF, Buffer, SizeOf(Buffer), NumRead) ;
   BlockWrite(ToF, Buffer, NumRead, NumWritten) ;
  until (NumRead = 0) or (NumWritten <> NumRead) ;
  CloseFile(FromF) ;
  CloseFile(ToF) ;
end;

Random access file

출처 : http://www.tek-tips.com/viewthread.cfm?qid=1540019&page=3

type
  recordtype=record
    varLastName   :string[50];
    varFirstName  :string[50];
    varEmail     :string[250];
end;

  qfile:file of recordtype;
  qfileTemp:file of recordtype;
  qrecord:recordtype;
  numrec:integer;
  numtemp:integer;

procedure TfrmDataBase.imgDeleteMouseUp(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin

  try

    ASSIGNFILE(qfile, Trim(lblFile.Caption));
    Reset(qfile);

    ASSIGNFILE(qfiletemp, ExtractFilePath(application.exename) + '\Database.tmp');
    REWRITE(qfiletemp);

      For numtemp:=0 To filesize(qfile)-1 Do
        begin

          seek(qfile,numtemp);
          read(qfile,qrecord);

          If IntToStr(numtemp + 1) <> Trim(lblPosition.Caption)  Then
            begin
              write (qfiletemp, qrecord);
            end;

        end;

    closefile(qfile);
    closefile(qfiletemp);

    deletefile(Trim(lblFile.Caption));
    renamefile(ExtractFilePath(application.exename) + '\Database.tmp', Trim(lblFile.Caption));

  except
   ShowMessage('Warning: access to file has been denied.' + #10 + #13 + #10 + #13 + 'Make sure the application folder is not read-only.');
   exit;
  end;

end;

출처 : http://www.xxlinux.com/linux/dev/Delphi/2007-10-30/11392.html
http://dolba.net/old_k2club/bbs/bbs.php3?board=delphi&mode=view&id=345&page=32&recnum=359&keyword=&flag=
http://www.pic16.com/BBS/dispbbs.asp?boardID=31&ID=17357&page=3

function StrToBin(const S: string): string;
const
  BitArray: array[0..15] of string =
      ('0000', '0001', '0010', '0011',
       '0100', '0101', '0110', '0111',
       '1000', '1001', '1010', '1011',
       '1100', '1101', '1110', '1111');
var
  Index: Integer;
  LoBits: Byte;
  HiBits: Byte;
begin
  Result := '';
  for Index := 1 to Length(S) do
  begin
      HiBits := (Byte( S[Index]) and $F0) shr 4;
      LoBits := Byte( S[Index]) and $0F;
      Result := Result + BitArray[HiBits];
      Result := Result + BitArray[LoBits];
  end;
end;

function StringToHex(const S: string): string;
var
  Index: Integer;
begin
  Result := '';
  for Index := 1 to Length(S) do
    Result := Result + IntToHex( Byte( S[Index] ), 2 );
end;

function TransChar(AChar: Char): Integer;
begin
  if AChar in ['0'..'9'] then
  Result := Ord(AChar) - Ord('0')
  else
  Result := 10 + Ord(AChar) - Ord('A');
end;

function HexToString(aHex: String): String;
var
  I : Integer;
  CharValue: Word;
begin
  Result := '';
  for I := 1 to Trunc(Length(aHex)/2) do begin
    Result := Result + ' ';
    CharValue := TransChar(aHex[2*I-1])*16 + TransChar(aHex[2*I]);
    Result[I] := Char(CharValue);
  end;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  ShowMessage(
    '한글'' Hex Code is ' + StringToHex('한글') + chr(13) +
    '한글'' Binary Code is ' + StrToBin('한글') + chr(13) +
    '한글'' HexToString ' + HexToString(StringToHex('한글'))
  );
end;

출처 : http://delphi.about.com/cs/adptips2002/a/bltip1002_5.htm

type
  TByteArr = array of byte;

function StringToBytes(aString: String): TByteArr;
var
  i: integer;
begin
  SetLength( Result, Length(aString)) ;
  for i := 0 to Length(aString) - 1 do
    Result[i] := ord(aString[i + 1]) { - 48} ;
end;

function BytesToString(aBytes : TByteArr): String;
begin
  Result := PChar(aBytes);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  buffer : TByteArr;
begin
  buffer := StringToByte(Edit1.Text);
  ShowMessage(ByteToString(buffer));
end;