while (Win32.GetMessage( out msg, IntPtr.Zero, 0, 0) != 0)

static extern uint GetMessagePos();

If you change the return type from uint to int, then you can do new Point(GetMessagePos()).

static extern IntPtr GetMessageExtraInfo();

Public Declare Function GetMessageExtraInfo Lib "user32" () As IntPtr

    Private Declare Function apiGetMessageExtraInfo Lib "user32" Alias "GetMessageExtraInfo" () As Int32

        apimouse_event(MOUSEEVENTF_WHEEL, 0, 0, increment, apiGetMessageExtraInfo)

///         <term>WH_GETMESSAGE (3)</term>

///         <term>WH_GETMESSAGE (3)</term>

        while (WindowsAPIs.GetMessage(out msg, IntPtr.Zero, 0, 0) && ! FOO_EXPRESSION )

'(if you have an error and you want to know the description, you could call environmentReg's private method GetMessage)

'(if you have an error and you want to know the description, you could call environmentReg's private method GetMessage)

     WH_GETMESSAGE = 3,

     WH_GETMESSAGE = 3

    /// The WM_PAINT message is sent when the system or another application makes a request to paint a portion of an application's window. The message is sent when the UpdateWindow or RedrawWindow function is called, or by the DispatchMessage function when the application obtains a WM_PAINT message by using the GetMessage or PeekMessage function.

    /// The WM_QUIT message indicates a request to terminate an application and is generated when the application calls the PostQuitMessage function. It causes the GetMessage function to return zero.

    /// The WM_TIMER message is posted to the installing thread's message queue when a timer expires. The message is posted by the GetMessage or PeekMessage function.

    '''The WM_TIMER message is posted to the installing thread's message queue when a timer expires. The message is posted by the GetMessage or PeekMessage function.