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GetForegroundWindow (user32)
Returns a handle to the window the user is working with.

C# Signature:

/// <summary>The GetForegroundWindow function returns a handle to the foreground window.</summary>
private static extern IntPtr GetForegroundWindow();

VB.NET Signature:

''' <summary>The GetForegroundWindow function returns a handle to the foreground window.</summary>
<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function GetForegroundWindow() As IntPtr
End Function

''' <summary>
    ''' Retrieves a handle to the foreground window (the window with which the user is currently working). The system assigns a slightly higher priority to the thread that creates the foreground window than it does to other threads.
    ''' </summary>
    ''' <returns>The return value is a handle to the foreground window. The foreground window can be NULL in certain circumstances, such as when a window is losing activation. </returns>
    ''' <remarks></remarks>
    Private Declare Function GetForegroundWindow Lib "user32.dll" () As IntPtr

User-Defined Types:




Tips & Tricks:

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Sample Code:

public ApplicationState AppState
        Process[] processCollection = Process.GetProcessesByName(ProcessName);
        if(processCollection != null && processCollection.Length  >= 1 &&
            processCollection[0] != null)
            IntPtr activeWindowHandle = Win32.GetForegroundWindow();
            //Optional int ProcessID;
            //Optional Win32.GetWindowThreadProcessId(GetForegroundWindow(),out ProcessID)
            foreach(Process wordProcess in processCollection)
                //Optional if( ProcessID == wordProcess.Id ) return ApplicationState.Focused;
                if(wordProcess.MainWindowHandle == activeWindowHandle)
                    return ApplicationState.Focused;
            return ApplicationState.Running;
        return ApplicationState.NotRunning;

Alternative Managed API:

The ManagedWindowsApi project ( provides a static property ManagedWinapi.SystemWindow.ForegroundWindow.


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