The latest video drivers can change the display resolution without rebooting. Unfortunately, the Screen object doesn’t always properly return the new display size; it only remembers the display size when the app first used it. This behavior appears to be driver-dependent, although it might be produced by the operating system (it occurs on my Windows NT machine but not on my Windows 98 system). If you need to determine screen dimensions at any time other than the Form_Load event, use the Windows API rather than the Screen object:
Private Type RECT Left As Long Top As Long Right As Long Bottom As LongEnd TypePrivate Declare Function GetDesktopWindow Lib _ "user32" Alias "GetDesktopWindow" () As LongPrivate Declare Function GetWindowRect Lib _ "user32" Alias "GetWindowRect" (ByVal hwnd _ As Long, lpRect As RECT) As LongPublic Function ScreenWidth() As Single Dim R As RECT GetWindowRect GetDesktopWindow(), R ScreenWidth = R.Right * Screen.TwipsPerPixelXEnd FunctionPublic Function ScreenHeight() As Single Dim R As RECT GetWindowRect GetDesktopWindow(), R ScreenHeight = R.Bottom * Screen.TwipsPerPixelYEnd Function
