How do I install LockBox 3 into Delphi 7?

问题:

This is my first time installing the libraries for Lockbox. I downloaded version 3.4.3 from sourceforge and have Delphi 7. The first step is to get this sucker to compile under Delphi 7 and it's been hell. I do hope that the components are easier to use once installed.

Ok. I have a unit that looks like this.

unit uTPLb_StrUtils;

interface

uses
  SysUtils, uTPLb_D7Compatibility;

function AnsiBytesOf(const S: string): TBytes;

implementation

function AnsiBytesOf(const S: string): TBytes;
begin
//compiler chokes here
  **Result := TEncoding.ANSI.GetBytes(S);**
end;

end.

BTW, the compatibility unit defines TBytes as TBytes = packed array of byte;

Delphi 7 chokes on the TEncoding because it only exists in D2009+. What do I replace this function with?

回答1:

String is an 8bit AnsiString in Delphi 7. Simply allocate the TBytes to the Length() of the string and Move() the string content into it:

function AnsiBytesOf(const S: AnsiString): TBytes;
begin
  SetLength(Result, Length(S) * SizeOf(AnsiChar));
  Move(PChar(S)^, PByte(Result)^, Length(Result));
end;

If you want to be politically correct and match what TEncoding.GetBytes() does, you would have to convert the String to a WideString and then use the Win32 API WideCharToMultiBytes() function to convert that to bytes:

function AnsiBytesOf(const S: WideString): TBytes;
var
  Len: Integer;
begin
  Result := nil;
  if S = '' then Exit;
  Len := WideCharToMultiByte(0, 0, PWideChar(S), Length(S), nil, 0, nil, nil);
  if Len = 0 then RaiseLastOSError;
  SetLength(Result, Len+1);
  WideCharToMultiByte(0, 0, PWideChar(S), Length(S), PAnsiChar(PByte(Result)), Len, nil, nil);
  Result[Len] = $0;
end;

回答2:

function Quux(const S: AnsiString): TBytes;
var
  Count: Integer;
begin
  Count := Length(S) * SizeOf(AnsiChar);
  {$IFOPT R+}
  if Count = 0 then Exit; // nothing to do
  {$ENDIF}
  SetLength(Result, Count);
  Move(S[1], Result[Low(Result)], Count);
end;

回答3:

You can get LB 3.5 here:

http://lockbox.seanbdurkin.id.au/Grok+TurboPower+LockBox

Try 3.5 instead.