@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The BlockInput API !!!!C# Signature: [DllImport("user32.dll")] static extern bool BlockInput(bool fBlockIt); !!!!VB.Net Signature: Declare Fuhhhhhon BlockInput Lib "user32" (ByVal fBlockIt As Boolean) As Boolean Or use: ''' <summary>The BlockInput function blocks keyboard and mouse input events from reaching applications ''' </summary> ''' <param name="fBlockIt">[in] Specifies the function's purpose. If this parameter is non-zero, keyboard ''' and mouse input events are blocked. If this parameter is zero, keyboard and mouse events are unblocked. ''' </param> ''' <returns>If the function succeeds, the return value is nonzero. ''' If input is already blocked, the return value is zero. ''' To get extended error information, call Marshal.GetLastWin32Error()</returns> ''' <remarks>Note that only the thread that blocked input can successfully unblock input</remarks> <DllImport("user32.dll", EntryPoint:="BlockInput", SetLastError:=True, CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> Friend Shared Function BlockInput(fBlockIt As Boolean) As Integer End Function Note that this definition does not use Boolean input and return types !!!!Notes: This method requires administrator rights. Blocks or unblocks mouse and keyboard input. Can be disabled by pressing Ctrl+Alt+Del. !!!!Tips & Tricks: Useful to create a temporary block in input for sensitive GUI operations. For instance when manually activating a screen saver from within a GUI function, a short blocking delay will prevent the user mouse movements directly after selection from accidently escaping the screen saver. !!!!Sample Code: VB.Net: Class BlockInput <DllImport("user32.dll", EntryPoint:="BlockInput", SetLastError:=True, CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> Friend Shared Function BlockInput(fBlockIt As Boolean) As Boolean End Function Friend Shared Function DisableInput(makeDisabled As Boolean) as Boolean Return BlockInput(makeDisabled) End Function End Class !!!!Alternative Managed API: The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides an InputBlocker class that can block input. Documentation: BlockInput@msdn on MSDN
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