servobj.pas

《Delphi开发人员指南》配书原码

unit ServObj;

interface

uses
  ComObj, ActiveX, Server_TLB;

type
  TBinaryData = class(TAutoObject, IBinaryData)
  protected
    function Get_Data: OleVariant; safecall;
    procedure Set_Data(Value: OleVariant); safecall;
  end;

implementation

uses ComServ, ServMain;

function TBinaryData.Get_Data: OleVariant;
var
  P: Pointer;
  L: Integer;
begin
  // Move data from memo into array
  L := Length(MainForm.Memo.Text);
  Result := VarArrayCreate([0, L - 1], varByte);
  P := VarArrayLock(Result);
  try
    Move(MainForm.Memo.Text[1], P^, L);
  finally
    VarArrayUnlock(Result);
  end;
end;

procedure TBinaryData.Set_Data(Value: OleVariant);
var
  P: Pointer;
  L: Integer;
  S: string;
begin
  // Move data from array into memo
  L := VarArrayHighBound(Value, 1) - VarArrayLowBound(Value, 1) + 1;
  SetLength(S, L);
  P := VarArrayLock(Value);
  try
    Move(P^, S[1], L);
  finally
    VarArrayUnlock(Value);
  end;
  MainForm.Memo.Text := S;
end;

initialization
  TAutoObjectFactory.Create(ComServer, TBinaryData, Class_BinaryData,
    ciSingleInstance, tmApartment);
end.