code.txt

Delphi经典函数 最新版 有不少更新

    system.insert(csLinesCR, Result, i);
    i := Pos(csStrCR, Result);
  end;
end;

//字符串加密函数
function Encrypt(const S: String; Key: Word): String;
var
   I : Integer;
begin
      Result := S;
      for I := 1 to Length(S) do
      begin
         Result[I] := char(byte(S[I]) xor (Key shr 8));
         Key := (byte(Result[I]) + Key) * C1 + C2;
         if Result[I] = Chr(0) then
            Result[I] := S[I];
      end;
      Result := StrToHex(Result);
end;

//字符串解密函数
function Decrypt(const S: String; Key: Word): String;
var
   I: Integer;
   S1: string;
begin
   S1 := HexToStr(S);
   Result := S1;
   for I := 1 to Length(S1) do
   begin
      if char(byte(S1[I]) xor (Key shr 8)) = Chr(0) then
         begin
            Result[I] := S1[I];
            Key := (byte(Chr(0)) + Key) * C1 + C2; //保证Key的正确性　　
         end
      else
         begin
            Result[I] := char(byte(S1[I]) xor (Key shr 8));
            Key := (byte(S1[I]) + Key) * C1 + C2;
         end;
   end;
end;

///VarIIF,VarTostr为变体函数
function varIIF(aTest: Boolean; TrueValue, FalseValue: Variant): Variant;
begin
  if aTest then Result := TrueValue else Result := FalseValue;
end;

function varToStr(const V: Variant): string;
begin
  case TVarData(v).vType of
    varSmallInt: Result := IntToStr(TVarData(v).VSmallInt);
    varInteger: Result := IntToStr(TVarData(v).VInteger);
    varSingle: Result := FloatToStr(TVarData(v).VSingle);
    varDouble: Result := FloatToStr(TVarData(v).VDouble);
    varCurrency: Result := FloatToStr(TVarData(v).VCurrency);
    varDate: Result := DateToStr(TVarData(v).VDate);
    varBoolean: Result := varIIf(TVarData(v).VBoolean, 'True', 'False');
    varByte: Result := IntToStr(TVarData(v).VByte);
    varString: Result := StrPas(TVarData(v).VString);
    varEmpty,
      varNull,
      varVariant,
      varUnknown,
      varTypeMask,
      varArray,
      varByRef,
      varDispatch,
      varError: Result := '';
  end;
end;

{功能说明：判断string是否全是数字}
function IsDigital(Value: string): boolean;
var
  i, j: integer;
  str: char;
begin
  result := true;
  Value := trim(Value);
  j := Length(Value);
  if j = 0 then
  begin
    result := false;
    exit;
  end;
  for i := 1 to j do
  begin
    str := Value[i];
    if not (str in ['0'..'9']) then
    begin
      result := false;
      exit;
    end;
  end;
end;

{随机字符串函数}
function RandomStr(aLength : Longint) : String;
var
  X : Longint;
begin
  if aLength <= 0 then exit;
  SetLength(Result, aLength);
  for X:=1 to aLength do
    Result[X] := Chr(Random(26) + 65);
end;

//▎============================================================▎//
//▎==================②扩展日期时间操作函数====================▎//
//▎============================================================▎//

function GetYear(Date: TDate): Integer;
var
  y, m, d: WORD;
begin
  DecodeDate(Date, y, m, d);
  Result := y;
end;

function GetMonth(Date: TDate): Integer;
var
  y, m, d: WORD;
begin
  DecodeDate(Date, y, m, d);
  Result := m;
end;

function GetDay(Date: TDate): Integer;
var
  y, m, d: WORD;
begin
  DecodeDate(Date, y, m, d);
  Result := d;
end;

function GetHour(Time: TTime): Integer;
var
  h, m, s, ms: WORD;
begin
  DecodeTime(Time, h, m, s, ms);
  Result := h;
end;

function GetMinute(Time: TTime): Integer;
var
  h, m, s, ms: WORD;
begin
  DecodeTime(Time, h, m, s, ms);
  Result := m;
end;

function GetSecond(Time: TTime): Integer;
var
  h, m, s, ms: WORD;
begin
  DecodeTime(Time, h, m, s, ms);
  Result := s;
end;

function GetMSecond(Time: TTime): Integer;
var
  h, m, s, ms: WORD;
begin
  DecodeTime(Time, h, m, s, ms);
  Result := ms;
end;

//传入年、月，得到该月份最后一天
function GetMonthLastDay(Cs_Year,Cs_Month:string):string;
Var
   V_date:Tdate;
   V_year,V_month,V_day:word;
begin
   V_year:=strtoint(Cs_year);
   V_month:=strtoint(Cs_month);
   if V_month=12 then
	   begin
   	   V_month:=1;
      	inc(V_year);
   	end
   else
   	inc(V_month);
	V_date:=EncodeDate(V_year,V_month,1);
	V_date:=V_date-1;
	DecodeDate(V_date,V_year,V_month,V_day);
	Result:=DateToStr(EncodeDate(V_year,V_month,V_day));
end;

//判断某年是否为闰年
function IsLeapYear( nYear: Integer ): Boolean;
begin
  Result := (nYear mod 4 = 0) and ((nYear mod 100 <> 0) or (nYear mod 400 = 0));
end;

//两个日期取较大的日期
function MaxDateTime(const Values: array of TDateTime): TDateTime;
var
  I: Cardinal;
begin
  Result := Values[0];
  for I := 0 to Low(Values) do
    if Values[I] < Result then Result := Values[I];
end;

//两个日期取较小的日期
function MinDateTime(const Values: array of TDateTime): TDateTime;
var
  I: Cardinal;
begin
  Result := Values[0];
  for I := 0 to High(Values) do
    if Values[I] < Result then Result := Values[I];
end;

//得到本月的第一一天
function dateBeginOfMonth(D: TDateTime): TDateTime;
var
  Year, Month, Day: Word;
begin
  DecodeDate(D, Year, Month, Day);
  Result := EncodeDate(Year, Month, 1);
end;

//得到本月的最后一天
function dateEndOfMonth(D: TDateTime): TDateTime;
var
  Year, Month, Day: Word;
begin
  DecodeDate(D, Year, Month, Day);
  if Month = 12 then
  begin
    Inc(Year);
    Month := 1;
  end else
    Inc(Month);
  Result := EncodeDate(Year, Month, 1) - 1;
end;

//得到本年的最后一天
function dateEndOfYear(D: TDateTime): TDateTime;
var
  Year, Month, Day: Word;
begin
  DecodeDate(D, Year, Month, Day);
  Result := EncodeDate(Year, 12, 31);
end;

//得到两个日期相隔的天数
function DaysBetween(Date1, Date2: TDateTime): integer;
begin
  Result := Trunc(Date2) - Trunc(Date1) + 1;
  if Result < 0 then Result := 0;
end;
//▎============================================================▎//
//▎=====================③位操作函数===========================▎//
//▎============================================================▎//

// 设置位
procedure SetBit(var Value: Byte; Bit: TByteBit; IsSet: Boolean);
begin
  if IsSet then
    Value := Value or (1 shl Bit)
  else
    Value := Value and not (1 shl Bit);
end;

procedure SetBit(var Value: WORD; Bit: TWordBit; IsSet: Boolean);
begin
  if IsSet then
    Value := Value or (1 shl Bit)
  else
    Value := Value and not (1 shl Bit);
end;

procedure SetBit(var Value: DWORD; Bit: TDWordBit; IsSet: Boolean);
begin
  if IsSet then
    Value := Value or (1 shl Bit)
  else
    Value := Value and not (1 shl Bit);
end;

// 取位
function GetBit(Value: Byte; Bit: TByteBit): Boolean;
begin
  Result := Value and (1 shl Bit) <> 0;
end;

function GetBit(Value: WORD; Bit: TWordBit): Boolean;
begin
  Result := Value and (1 shl Bit) <> 0;
end;

function GetBit(Value: DWORD; Bit: TDWordBit): Boolean;
begin
  Result := Value and (1 shl Bit) <> 0;
end;

//▎============================================================▎//
//▎=================④扩展的文件及目录操作函数=================▎//
//▎============================================================▎//

// 移动文件、目录
function MoveFile(const sName, dName: string): Boolean;
var
  s1, s2: AnsiString;
  lpFileOp: TSHFileOpStruct;
begin
  s1 := PChar(sName) + #0#0;
  s2 := PChar(dName) + #0#0;
  with lpFileOp do
  begin
    Wnd := Application.Handle;
    wFunc := FO_MOVE;
    pFrom := PChar(s1);
    pTo := PChar(s2);
    fFlags := FOF_ALLOWUNDO;
    hNameMappings := nil;
    lpszProgressTitle := nil;
    fAnyOperationsAborted := True;
  end;
  Result := SHFileOperation(lpFileOp) = 0;
end;

// 打开文件属性窗口
procedure FileProperties(const FName: string);
var
  SEI: SHELLEXECUTEINFO;
begin
  with SEI do
  begin
    cbSize := SizeOf(SEI);
    fMask := SEE_MASK_NOCLOSEPROCESS or SEE_MASK_INVOKEIDLIST or
      SEE_MASK_FLAG_NO_UI;
    Wnd := Application.Handle;
    lpVerb := 'properties';
    lpFile := PChar(FName);
    lpParameters := nil;
    lpDirectory := nil;
    nShow := 0;
    hInstApp := 0;
    lpIDList := nil;
  end;
  ShellExecuteEx(@SEI);
end;

// 缩短显示不下的长路径名
function FormatPath(APath: string; Width: Integer): string;
var
  SLen: Integer;
  i, j: Integer;
  TString: string;
begin
  SLen := Length(APath);
  if (SLen <= Width) or (Width <= 6) then
  begin
    Result := APath;
    Exit
  end
  else
  begin
    i := SLen;
    TString := APath;
    for j := 1 to 2 do
    begin
      while (TString[i] <> '\') and (SLen - i < Width - 8) do
        i := i - 1;
      i := i - 1;
    end;
    for j := SLen - i - 1 downto 0 do
      TString[Width - j] := TString[SLen - j];
    for j := SLen - i to SLen - i + 2 do
      TString[Width - j] := '.';
    Delete(TString, Width + 1, 255);
    Result := TString;
  end;
end;

// 打开文件框
function OpenDialog(var FileName: string; Title: string; Filter: string;
  Ext: string): Boolean;
var
  OpenName: TOPENFILENAME;
  TempFilename, ReturnFile: string;
begin
  with OpenName do
  begin
    lStructSize := SizeOf(OpenName);
    hWndOwner := GetModuleHandle('');
    Hinstance := SysInit.Hinstance;
    lpstrFilter := PChar(Filter + #0 + Ext + #0#0);
    lpstrCustomFilter := '';
    nMaxCustFilter := 0;
    nFilterIndex := 1;
    nMaxFile := MAX_PATH;
    SetLength(TempFilename, nMaxFile + 2);
    lpstrFile := PChar(TempFilename);
    FillChar(lpstrFile^, MAX_PATH, 0);
    SetLength(TempFilename, nMaxFile + 2);
    nMaxFileTitle := MAX_PATH;
    SetLength(ReturnFile, MAX_PATH + 2);
    lpstrFileTitle := PChar(ReturnFile);
    FillChar(lpstrFile^, MAX_PATH, 0);
    lpstrInitialDir := '.';
    lpstrTitle := PChar(Title);
    Flags := OFN_HIDEREADONLY + OFN_ENABLESIZING;
    nFileOffset := 0;
    nFileExtension := 0;
    lpstrDefExt := PChar(Ext);
    lCustData := 0;
    lpfnHook := nil;
    lpTemplateName := '';
  end;
  Result := GetOpenFileName(OpenName);
  if Result then
    FileName := ReturnFile
  else
    FileName := '';
end;

// 取两个目录的相对路径,注意串尾不能是'\'字符!
function GetRelativePath(Source, Dest: string): string;
  // 比较两路径字符串头部相同串的函数
  function GetPathComp(s1, s2: string): Integer;
  begin
    if Length(s1) > Length(s2) then swapStr(s1, s2);
    Result := Pos(s1, s2);
    while (Result = 0) and (Length(s1) > 3) do
    begin