//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// UTILITY VARIE 
//-----------------------------------------------------------------------------
function _Errore( szErrorString )
begin
   SetDialogTitle( DLG_MSG_SEVERE, "Errore fatale!" );
    MessageBox( szErrorString, SEVERE );
    _ShowExitDialog( DLG_EXITFAILURE );
    exit;
end;
//-----------------------------------------------------------------------------
function _Attenzione( szWarningString )
begin
   SetDialogTitle( DLG_MSG_WARNING, "Attenzione!" );
   MessageBox( szWarningString, WARNING );
end;

//-----------------------------------------------------------------------------
function _Informazione( szWarningString )
begin
   SetDialogTitle( DLG_MSG_WARNING, "Attenzione!" );
   MessageBox( szWarningString, INFORMATION);
end;


//-----------------------------------------------------------------------------
function _Verifica( szQuestion )
   NUMBER nRet;
begin
    SetDialogTitle( DLG_ASK_YESNO, "Verifica" );
    nRet = AskYesNo( szQuestion, NO );
    return nRet;
end;
//-----------------------------------------------------------------------------
function _MostraModelessDialog( )
   NUMBER nHwnd, nRet, nMess;
begin
   _CreateDLG (  "DLG_PLEASEWAIT", DLG_PLEASEWAIT, HWND_INSTALL );
   nMess = WaitOnDialog( "DLG_PLEASEWAIT" );
   if ( nMess = DLG_ERR ) then
    _Attenzione( STR_ERR_DLG );
   endif;
   nHwnd = CmdGetHwndDlg( "DLG_PLEASEWAIT" );
   nRet = ShowWindow ( nHwnd, 1 );
   if ( nRet = -1 ) then
    _Attenzione( "Errore in ShowWindow" );
   endif;
end;
//-----------------------------------------------------------------------------
function _SettaModelessDialog( szText )
begin
   CtrlSetText( "DLG_PLEASEWAIT", IDD_MLTEXT, szText );
end;
//-----------------------------------------------------------------------------
function _NascondiModelessDialog( )
begin
  EndDialog( "DLG_PLEASEWAIT" );
  ReleaseDialog( "DLG_PLEASEWAIT" );
end;

//-----------------------------------------------------------------------------
// Funzione che termina se la quantità di memoria è minore di quella richiesta
function _RichiediMemoria( nReq )
   NUMBER nExMem;
   STRING szExMem[_MAX_LENGTH];
begin
   GetSystemInfo( EXTENDEDMEMORY, nExMem, szExMem );
   if nReq >= nExMem then
    _Errore( STR_NOTENUFEXMEM );
   endif;
end;
//-----------------------------------------------------------------------------
function _NToStringKB( nKB, szValue )
begin
   NumToStr( szValue, nKB );
   szValue = szValue + " Kb";
end;

//-----------------------------------------------------------------------------
function _DeSlash( szSource, szDest )
   NUMBER nLen;
   STRING szTemp;
begin
   nLen = StrLength( szSource );
   StrSub( szTemp, szSource, nLen - 1, 1 );
   if szTemp = "\\" then
    StrSub( szDest, szSource, 0, nLen - 1 );
   else
    szDest = szSource;
   endif;
end;
//-----------------------------------------------------------------------------
function _CercaFileOvunque( szNomeFile, szRet )
   NUMBER nRet1, nRet2, listDirs, listDrive;
   STRING szDir[_MAX_LENGTH], szMLText[_MAX_LENGTH], szDrive[_MAX_LENGTH];
begin
   _MostraModelessDialog( );
   listDrive = ListCreate( STRINGLIST );
   if ( listDrive = LIST_NULL ) then
    _Errore( "Errore fatale in ListCreate(listDrive)" );
    _NascondiModelessDialog( );
   endif;
   if ( GetValidDrivesList( listDrive, FIXED_DRIVE, 0 ) < 0 ) then
    _Errore( "Errore fatale in GetValidDriveList" );
    _NascondiModelessDialog( );
   endif;
   nRet1 = ListGetFirstString( listDrive, szDrive );
  while ( nRet1 != END_OF_LIST )
    szMLText = "Verifica di una precedente installazione sul drive " + szDrive + ": ...";
    // szMLText = szMLText;
    _SettaModelessDialog( szMLText );
    szDrive = szDrive + ":\\";
    if ( FindAllFiles( szDrive, szNomeFile, szRet, RESET ) = 0 ) then
     _NascondiModelessDialog( );
       return;
    endif;
    nRet1 = ListGetNextString( listDrive, szDrive );
   endwhile;
   ListDestroy( listDrive );
   _NascondiModelessDialog( );
   szRet = "";
   return;
end;
//-----------------------------------------------------------------------------
function _DisattivaScreenSaver( )
begin
   bSCREENSAVER = _WinSubCheckScreenSaver( );
   _WinSubScreenSaver( FALSE );
end;
//-----------------------------------------------------------------------------
function _RiattivaScreenSaver( )
begin
   if bSCREENSAVER then
    _WinSubScreenSaver( TRUE );
   endif;
end;


//________________________________________________________________________________________________________________________
// *** Reperisce il nome del sistema operativo

function _GetOSName( )

  NUMBER nResult;
  STRING szResult;
  STRING szCheckDir[255];

begin
   VarSave(SRCTARGETDIR);
   TARGETDIR = WINSYSDIR;
   GetSystemInfo(WINMAJOR,nResult,szResult);
   bIsWin95 = FALSE;

  if(GetSystemInfo(OS,nResult,szOSName) < 0) then
    MessageBox("Couldn't get Operating System info",WARNING);
  else

// attenzione: con la nascita di win2000 é sorto un pó di casino: infatti non é previsto da installshield3; inoltre, pur
// essendo una evoluzione di WinNT non sempre presenta la cartella C:\winnt (27/06/2000); quindi si é resa necessaria la 
// ricerca della directory che contiene il sistema operativo (Windows2000, ovviamente) e, all'interno di essa, la directory
// pwls che contiene i files degli utenti del sistema win2000 (tale directory non é infatti presente in altre versioni di
// Windows (per ora...)) (05/12/2000)
// Nuova puntata! Adesso c'é pure il terribile Win2000 server che, ovviamente, non ha la directory pwls sotto la sua
// directory principale! Quindi, se non viene trovata la pwls si cerca la directory windirectory\system32\ras, che é tipica
// dei sistemi windowsNT/2000 (c'é quindi sia sul client che sul server); per ora funziona, ma in futuro...? (20/02/2001)
  
	if (nResult=IS_WINDOWS95) then
	  szCheckDir = WINDIR ^ "pwls";
	  if (Is(PATH_EXISTS, szCheckDir)=TRUE) then
		nResult=IS_WINDOWSNT;
	  else
	    szCheckDir = WINSYSDIR ^ "../system32/ras";
		if (Is(PATH_EXISTS, szCheckDir)=TRUE) then
		  nResult=IS_WINDOWSNT;
		endif;
	  endif;
	endif;

    switch(nResult)
    case IS_WINDOWSNT:
      szOSName="Windows NT";
    case IS_WINDOWS95:
      szOSName="Windows 95";
      bIsWin95 = TRUE;
    endswitch;
  endif;

   VarRestore(SRCTARGETDIR);
end;


//-----------------------------------------------------------------------------
// Reperisce il nome del sistema operativo
function _GetTmpDir(szResult )
  STRING szTemp;
begin
  szTemp=SUPPORTDIR;
  szResult =szTemp;
end;


//-----------------------------------------------------------------------------
function _CreateDLG( szDLG, iDLG_ID, lHwnd )
    STRING  szSupportDLL [ _MAX_LENGTH ];
begin
    szSupportDLL = SUPPORTDIR ^ "\\PSETUP.DLL";
    if ( DefineDialog( szDLG, 0 , szSupportDLL, iDLG_ID, "", HWND_DESKTOP, lHwnd, DLG_MSG_STANDARD | DLG_CENTERED ) ) then
    _Errore( "Errore interno. Impossibile creare una finestra di dialogo.\nInstallazione terminata." );
    endif;
end;

//---------------------------------------------------------------------------------------------------------------------
function _Cambia_Attributi(szS0)
  STRING szS1[_MAX_LENGTH];
begin
    if ( Is( FILE_EXISTS, szS0 ) ) then
     if (SetFileInfo(szS0,FILE_ATTRIBUTE,FILE_ATTR_NORMAL|FILE_ATTR_ARCHIVED,"") < 0) then
      szS1 = "Impossibile cambiare i permessi ad " ^ szS0;
      MessageBox(szS1,WARNING);
     endif;
    endif;
end;

//----------------------------------------------------------------------------------------------------------------------
function _TCPIPPresent()
  NUMBER nvResult;
begin
    if (UseDLL("winsock.dll")=0) then
      UnUseDLL("winsock.dll");
      nvResult =TRUE;
    else
      nvResult =FALSE;
    endif;
  return nvResult;
end;