PC World Komputer 1998 April A/Pcwk4a98.iso/PROGRAM/DELPHI16/Ypasswrd/YRPASSWD.PAS

Pascal/Delphi Source File | 1995-11-28 | 12KB | 263 lines

unit YRPasswd;
{------------------------------------------------------------------------------}
{ Copyright             : ⌐ Copyright 1995 by Y. Rochat                        }
{ Creation Date         : 25/10/1995                                           }
{ Last Update           : 28/11/1995                                           }
{ Version Number        : 1.60                                                 }
{ Programation Language : DELPHI 1.01                                          }
{------------------------------------------------------------------------------}
{ PASSWORD.DLL    V. 1.60 :  A Windows DLL that let you manage user's name and   }
{                          password in order to protect your programs.  This   }
{                          DLL, which is FREEWARE ( ⌐ Copyright 1995 by Yves   }
{                          Rochat ), implements one function :                 }
{                                                                              }
{            MotDePasse(var UserN : String ; var PriorityL : Integer ;            }
{                                   IniFileName,SectionName : String) : WordBool ;             }
{                                                                              }
{  IniFileName : The name of the .INI file which keeps the list of users names }
{                and their associated encrypted passwords. If you don't add a  }
{                path to this name, we suppose that it is in the same directory}
{                as the file PASSWORD.DLL                                      }
{  SectionName : The name (without brakets) of the section in IniFileName which}
{                contains the information about users and passwords            }
{                                                                              }
{ If you succeed to login in the program, UserN and PriorityL will contain     }
{ respectively the name of the user who logs in and it's associated priority   }
{ level. Priority is a number which can varies between 1 (lowest priority) to  }
{ 9 (highest priority).                                                        }
{                                                                              }
{                Author :  Yves ROCHAT                                         }
{                 Email :  [e-mail]                                  }
{               Address :  Ch. de la ClergΦre 36                               }
{                          CH-1009 PULLY (Vaud)                                }
{                          SWITZERLAND                                         }
{------------------------------------------------------------------------------}
{ TYRPasswd Version 1.6 :  A Freeware component that let you use PASSWORD.DLL  }
{                          You MUST install it in your component palette before}
{                          using it. It will be on the palette named 'YRPasswd'}
{                                                                              }
{ HOW TO USE IT : 1) Put a TYRPasswd (by ex. MyPswd) in you Delphi form        }
{                 2) Do the following in the procedure FormCreate :            }
{                                                                              }
{ procedure TForm1.FormCreate(Sender: TObject);                                }
{ begin                                                                        }
{   If not Mypswd.GetPassword    then                                             }
{   Begin                                                                      }
{       If not Mypswd.ExistDll                                                    }
{       then MessageDlg('File PASSWORD.DLL is missing' + #13#10 + #13#10 +     }
{                                  'You are not authorized to use this program !',        }
{                        mtInformation,[mbOk], 0)                              }
{       else MessageDlg('BAD PASSWORD....', mtInformation,[mbOk], 0);          }
{     Application.Terminate ;                                                  }
{   End else                                                                   }
{   MessageDlg('GOOD PASSWORD....', mtInformation,[mbOk], 0);                  }
{ end;                                                                         }
{                                                                              }
{ procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);       }
{ begin                                                                        }
{   if MessageDlg('Close application ?', mtConfirmation,                       }
{     [mbYes, mbNo], 0) = mrYes then                                           }
{   begin                                                                      }
{     Action := caFree ;                                                       }
{     Mypswd.FreeDllPassword ; <---- TO FREE MEMORY ALLOCATED FOR PASSWORD.DLL }
{   end                                                                        }
{   else                                                                       }
{     Action := caNone;                                                        }
{ end;                                                                         }
{                                                                              }
{ Properties of the component                                                  }
{ ---------------------------                                                  }
{                                                                              }
{  ExistDll            : True if PASSWORD.DLL exists, false otherwise                 }
{  LoadedDll        : True if PASSWORD.DLL is loaded, false otherwise              }
{  OkLogin          : Set it to True to test the Login Dialog at design time       }
{                 Set it to False to unload PASSWORD.DLL from memory           }
{                 ALWAYS SET IT TO FALSE BEFORE CLOSING A PROJECT WHICH        }
{                 CONTAINS A TYRPASSWD COMPONENT                               }
{  UserName         : Name of the user who logs in                                 }
{  UserLevel         : Priority level of the user who logs in                       }
{  IniName             : Name of the .INI file which contains users information       }
{  SectionName     : Name of the Section in the file IniName                      }
{                                                                              }
{------------------------------------------------------------------------------}
{                               IMPORTANT                                      }
{                                                                              }
{ You can use this code as is and you are FREE to copy/distribute it provided  }
{ that this notice is not modified and included in the distrubution pack.      }
{ I'll be more than happy to hear from you for your comments about a real-life }
{ use of this code. Please send your comments to " [e-mail] " with   }
{ subject field starting with the words 'TYRPASSWD'.                           }
{------------------------------------------------------------------------------}
{:DISCLAIMER:                                                                  }
{------------                                                                  }
{  THIS SOURCE CODE IS DELIVERED AS IS. THERE IS NO REASON TO THINK THAT IT    }
{  SHOULD NOT WORK AS CLAIMED. BUT JUST IN CASE, LET ME DISCLAIM THAT YVES     }
{  ROCHAT CAN NOT BE HELD LIABLE IF YOU LOOSE TIME OR MONEY USING THIS CODE.   }
{------------------------------------------------------------------------------}
interface

uses
  WinTypes, Messages, Classes, Graphics, Controls, Forms{, SysUtils} ;

const
    DLLNAME    = 'PASSWORD.DLL' ;

var
    Login: function(var UserN : String ; var PriorityL : Integer ;
                                    IniFileName,SectionName : String) : WordBool ;

type
  TYRPasswd = class(TComponent)
      private
        { Private field declarations }
      FExistDll            : Boolean ;
      FLoadedDll        : Boolean ;
      FOkLogin            : Boolean ;
      FUserName            : String ;
      FUserLevel        : Integer ;
      FIniName            :    String ;
      FSectionName    : String ;
      FHandleDll        :    Word ;
      function    SetExistDll(AValue : Boolean) : Boolean ;
      function    SetLoadedDll(AValue : Boolean) : Boolean ;
      function    SetOkLogin(AValue : Boolean) : Boolean ;
      function    SetUserName(AStr : String) : String ;
      function    SetUserLevel(AInt : Integer) : Integer ;
      protected
        { Protected method declarations }
      public
        { Public interface declarations }
        constructor Create(AOwner: TComponent); override;
          function  GetPassword : Boolean;
      procedure FreeDllPassword ;
      published
        { Published design declarations }
        property ExistDll            : Boolean read FExistDll        write SetExistDll        default False ;
      property LoadedDll        : Boolean read FLoadedDll     write SetLoadedDll    default False ;
      property OkLogin          : Boolean read FOkLogin            write SetOkLogin        default False ;
        property UserName         : String     read FUserName         write SetUserName ;
        property UserLevel         : Integer    read FUserLevel     write SetUserLevel ;
        property IniName             : String     read FIniName         write FIniName ;
        property SectionName     : String     read FSectionName    write FSectionName ;
  end;

procedure Register;

implementation

{$IFDEF WINDOWS}
uses
    WinProcs, Dialogs, SysUtils ;
const
    SEM_NoOpenFileErrorBox = $8000;
{$ELSE}
uses
    WinAPI, Dialogs, SysUtils ;
{$ENDIF}

procedure Register;
begin
  RegisterComponents('YRPasswd', [TYRPasswd]);
end {Register} ;

constructor TYRPasswd.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FExistDll            := False ;
  FLoadedDll        := False ;
  FOkLogin            := False ;
  FUserName            := 'Unknown' ;
  FUserLevel        := 0 ;
  FIniName            := 'password.ini' ;
  FSectionName    := 'Users' ;
  FHandleDll        := 0 ;
  SetExistDll(True) ;
end {Create} ;

procedure TYRPasswd.FreeDllPassword ;
begin
  If FHandleDLL >= 32    { Password loaded } then
  Begin
    FreeLibrary(FHandleDLL) ;
    FHandleDll    := 0 ;
    FLoadedDll    := False ;
    FUserName        := 'Unknown' ;
    FUserLevel    := 0 ;
  End ;
end ;

function TYRPasswd.SetExistDll(AValue : Boolean) : Boolean ;
begin
  FExistDll    := FileExists(DLLNAME) ;
end ;

function TYRPasswd.SetLoadedDll(AValue : Boolean) : Boolean ;
begin
  { Nothing to do }
end ;

function TYRPasswd.SetOkLogin(AValue : Boolean) : Boolean ;
begin
  If AValue
      then    GetPassword
    else    Begin
            FreeDllPassword ;
                    FOkLogin    := False ;
                End ;
end ;

function TYRPasswd.SetUserName(AStr : String) : String ;
begin
  { Nothing to do }
end ;

function TYRPasswd.SetUserLevel(AInt : Integer) : Integer ;
begin
  { Nothing to do }
end ;

function TYRPasswd.GetPassword : Boolean;
begin
  Result        := False ;
  FOkLogin    := False ;
  If FHandleDll = 0 then
  Begin
      {$IFDEF WINDOWS}
      SetErrorMode(SEM_NoOpenFileErrorBox);
      {$ENDIF}
      FHandleDll := LoadLibrary(DLLNAME);
    Case FHandleDll of
        2    :    Begin
                  MessageDlg('File ' + DLLNAME + ' was not found', mtInformation,[mbOk], 0);
            FHandleDll := 0 ;
              End ;
      3    : Begin
                  MessageDlg('Path to ' + DLLNAME + ' was not found', mtInformation,[mbOk], 0);
            FHandleDll := 0 ;
              End ;
      8    : Begin
                  MessageDlg('Insufficient memory to start the application !', mtInformation,[mbOk], 0);
            FHandleDll := 0 ;
              End ;
      else
          If FHandleDll >= 32 then { Succes }
              Begin
                FLoadedDll    := True;
                @Login            := GetProcAddress(FHandleDll,'MOTDEPASSE');
            End else
        Begin
          MessageDlg(' Error when loading ' + DLLNAME + ' !', mtInformation,[mbOk], 0);
          FHandleDll := 0 ;
        End ;
    End ;
    SetExistDll(True) ;
  End ;
  If FLoadedDll and Login(FUserName,FUserLevel,FIniName,FSectionName)    then
  Begin
    Result        := True ;
      FOkLogin    := True ;
  End ;
end {GetPassword} ;

end.