Tell if lock screen is up!

[RAJSPY]

Hi all,

I want to start a program through a SMS job. Only, the program must wait until the user is logged on. so far so good realizing this with SMS. The problem is that our company has a screen lock within 10 minutes (company policy) if the program starts with the lock screen on I want to wait until the user unlocks the desktop. Is there some variable that records if the screen is locked?

Thanks in advanced,

[Plater]

I wish I were more help on this, but yes I think there was a way to get this information. I saw it on here a long time ago. Don't remember how or where though, sorry.

[RAJSPY]

Yeah i have seen one with session switch hooks. But that doesn't give a answer back if the screen is already locked.

Anybody else has a clue??

Thanx

[Plater]

I am thinking somewhere burried in WMI you can get the current user state, which should include if screen is locked or not.

[KodeKrazy]

Try this. You may have to tweak it a bit as I converted it to .NET from some old VB6 snippet I used previously in an app that required it. Also, you may get an error on the "Switch Screen" part, if you do, it means the desktop is locked.

KK

 
Public Class Form1
Inherits System.Windows.Forms.Form
Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Call Test()
End Sub
End Class
 
Module Module1
Private Declare Function OpenDesktop Lib "user32" Alias "OpenDesktopA" (ByVal lpszDesktop As String, ByVal dwFlags As Integer, ByVal fInherit As Integer, ByVal dwDesiredAccess As Integer) As Integer
Private Declare Function SwitchDesktop Lib "user32" (ByVal hDesktop As Integer) As Integer
Private Declare Function CloseDesktop Lib "user32" (ByVal hDesktop As Integer) As Integer
Private Const DESKTOP_SWITCHDESKTOP As Integer = &H100
 
Public Sub Test()
Dim p_lngHwnd As Integer
Dim p_lngRtn As Integer
Dim p_lngErr As Integer
 
p_lngHwnd = OpenDesktop(lpszDesktop:="Default", dwFlags:=0, fInherit:=False, dwDesiredAccess:=DESKTOP_SWITCHDESKTOP)
If p_lngHwnd = 0 Then
Debug.WriteLine("Err with OpenDesktop: " & Err.LastDllError)
Else
p_lngRtn = SwitchDesktop(hDesktop:=p_lngHwnd)
p_lngErr = Err.LastDllError
 
If p_lngRtn = 0 Then
If p_lngErr = 0 Then
Debug.WriteLine("Desktop is locked: " & Err.LastDllError)
Else
Debug.WriteLine("Error with SwitchDesktop: " & Err.LastDllError)
End If
Else
Debug.WriteLine("Not Locked")
End If
p_lngHwnd = CloseDesktop(p_lngHwnd)
End If
End Sub
End Module
 
 

[RAJSPY]

Thanx it works perfect.

I had some code like this but the syntaxes where not good. And I was just searching for some answers and you dropped them here Thanx again.

I've turned it to this C# code:

[DllImport("user32", EntryPoint ="OpenDesktopA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern int OpenDesktopA(String lpszDesktop, int dwFlags, int fInherit, int dwDesiredAccess);
 
public int OpenDesktop(String lpszDesktop,int dwFlags,int fInherit,int dwDesiredAccess)
{
    return OpenDesktopA(lpszDesktop,dwFlags,fInherit,dwDesiredAccess);
}
 
[DllImport("user32", EntryPoint ="SwitchDesktop", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern int SwitchDesktop(int hDesktop);
 
public int Switch_Desktop(int hDesktop)
{
  return SwitchDesktop(hDesktop);
}
 
[DllImport("user32", EntryPoint = "CloseDesktop", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern int CloseDesktop(int hDesktop);
 
public int Close_Desktop(int hDesktop)
{
   return CloseDesktop(hDesktop);
}
 
And in your application:
private const int DESKTOP_SWITCHDESKTOP = 0x100;
 
int p_lngHwnd;
int p_lngRtn;
try
{            
  p_lngHwnd = _ModalDesktop.OpenDesktop("default", 0, 0, DESKTOP_SWITCHDESKTOP);
 p_lngRtn = _ModalDesktop.Switch_Desktop(p_lngHwnd);
 if (p_lngRtn == 0) 
{
  //Do somthing here .....
}
 p_lngHwnd = _ModalDesktop.Close_Desktop(p_lngHwnd); 
}
catch(Exception ex)
{
  //Some code here .....
}