Translating VB6 Code to kill the screen saver.

[Gregory_May]

I cant seem to figure out this vb6 code ... its almost done except for the
"AddressOf StopScreenSaverProc" ... anyone know how to fix this?.... it says
a "long" isnt a Delegate. Or if someone knows a cleaner way to kill the
screen saver, that would be fine too.

Thanks!



Public Class ScreenSaverControlClass

' Declare Type for API call:
Private Structure OSVERSIONINFO
Dim dwOSVersionInfoSize As Integer
Dim dwMajorVersion As Integer
Dim dwMinorVersion As Integer
Dim dwBuildNumber As Integer
Dim dwPlatformId As Integer
<VBFixedString(128),
System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValTStr,
SizeConst:=128)> Public szCSDVersion As String ' Maintenance string for PSS
usage
End Structure

Private Declare Function GetVersionEx Lib "kernel32" Alias
"GetVersionExA" (ByRef lpVersionInformation As OSVERSIONINFO) As Integer

Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const VER_PLATFORM_WIN32_NT = 2

Private Declare Function SystemParametersInfo Lib "user32" Alias
"SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, ByRef
lpvParam As Any, ByVal fuWinIni As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA"
(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam
As Any) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA"
(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam
As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA"
(ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function OpenDesktop Lib "user32" Alias "OpenDesktopA"
(ByVal lpszDesktop As String, ByVal dwFlags As Long, ByVal fInherit As
Boolean, ByVal dwDesiredAccess As Long) As Long
Private Declare Function CloseDesktop Lib "user32" (ByVal hDesktop As
Long) As Long
Private Declare Function EnumDesktopWindows Lib "user32" (ByVal hDesktop
As Long, ByVal lpfn As Long, ByVal lParam As Long) As Long

Private Const SC_SCREENSAVE = &HF140&

Private Const SPI_GETSCREENSAVEACTIVE = 16
Private Const SPI_SCREENSAVERRUNNING = 97
Private Const SPI_SETSCREENSAVEACTIVE = 17

Private Const SPIF_NOINIFILE = &H0
Private Const SPIF_SENDWININICHANGE = &H2
Private Const SPIF_UPDATEINIFILE = &H1

Private Const DESKTOP_READOBJECTS = &H1&
Private Const DESKTOP_WRITEOBJECTS = &H80&

Private Const WM_CLOSE = &H10
Private Const WM_SYSCOMMAND = &H112

Public Function StopScreenSaverProc(ByVal hWnd As Long, ByVal lParam As
Long) As Boolean
Dim lngRet As Long

Call PostMessage(hWnd, WM_CLOSE, 0, 0)
Call SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 1, 0,
SPIF_SENDWININICHANGE)

StopScreenSaverProc = True
End Function

Delegate Function Compare(ByVal x As Integer, _
ByVal y As Integer) As Boolean


Public Sub StopScreenSaver()
Dim OSVER As OSVERSIONINFO

OSVER.dwOSVersionInfoSize = Len(OSVER)
Call GetVersionEx(OSVER)

Select Case OSVER.dwPlatformId
Case VER_PLATFORM_WIN32_WINDOWS '95,98
Dim hWnd As Long
hWnd = FindWindow("WindowsScreenSaverClass", vbNullString)
If hWnd <> 0 Then
Call PostMessage(hWnd, WM_CLOSE, 0, 0)
End If
Case VER_PLATFORM_WIN32_NT 'NT
Dim hDesk As Long
hDesk = OpenDesktop("Screen-Saver", 0, False,
DESKTOP_READOBJECTS Or DESKTOP_WRITEOBJECTS)
If hDesk <> 0 Then
Call EnumDesktopWindows(hDesk, AddressOf
StopScreenSaverProc, 0)
Call CloseDesktop(hDesk)
End If
End Select
End Sub
End Class

 

[Cor Ligthert [MVP]]

Gregory,

Mostly this does not work because there has been a shift and some
namechanges.

By instance a long in VB6 is an integer in VB.Net.

I hope this helps,

Cor