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GetLastInputInfo (user32)

C# Signature:

static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

VB Signature:

<DllImport("user32.dll")> _
Shared Function GetLastInputInfo(ByRef plii As LASTINPUTINFO) As Boolean
End Function

C++ Signature:


static bool GetLastInputInfo(LASTINPUTINFO* plii);

User-Defined Types:



Very usefull to detect user-idle state of an application.

Minimum operating systems: Windows 2000

Tips & Tricks:

Please add some!

Sample Code:

This function retrieves the time since last user input

    static int GetLastInputTime()
        int idleTime = 0;
        LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();
        lastInputInfo.cbSize = Marshal.SizeOf( lastInputInfo );
        lastInputInfo.dwTime = 0;

        int envTicks = Environment.TickCount;

        if( GetLastInputInfo( ref lastInputInfo ) )
        int lastInputTick = lastInputInfo.dwTime;

        idleTime = envTicks - lastInputTick;

        return (( idleTime > 0 ) ? ( idleTime / 1000 ) : idleTime );

Sample Code

This function retrieves the time since last user input

Dim idletime As Integer
Dim lastInputInf As New LASTINPUTINFO()

   Public Function GetLastInputTime() As Integer

    idletime = 0
    lastInputInf.cbSize = Marshal.SizeOf(lastInputInf)
    lastInputInf.dwTime = 0

    If GetLastInputInfo(lastInputInf) Then
        idletime = Environment.TickCount - lastInputInf.dwTime
    End If

    If idletime > 0 Then
        Return idletime / 1000
    Else : Return 0
    End If

   End Function

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