SetBlitz3DEventCallback and SetBlitz3DHWND Bug

Hi, I found another solution for .NET 2008 (maybe it works with 2005 too).

Edit: Oh, it seems that mouse input does not work... only keyboard...

Add the following class to your project (C#):

B3DMessageFilter.cs

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Security.Permissions;


[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public class B3DMessageFilter : IMessageFilter
{
    [DllImport("user32.dll")]
    extern private static int FindWindowEx(int parent_hwnd, int child_hwnd, int classname, int name);

    [DllImport("user32.dll")]
    extern private static int SetFocus(int hwnd);


    private IntPtr handle;
    private int child_hwnd;

    
    public B3DMessageFilter(IntPtr handle)
    {
        this.handle = handle;
    }


    #region IMessageFilter Members

    public bool PreFilterMessage(ref Message m)
    {
        if (m.HWnd == handle)
        {
            if (child_hwnd == 0) child_hwnd = FindWindowEx(handle.ToInt32(), 0, 0, 0);
            if (child_hwnd != 0) SetFocus(child_hwnd);
        }
        return false;
    }

    #endregion
}

This message filter filters messages for the specified render target control. Whenever a message is received it looks for the child control and sets the input focus to this control.


How to use the filter:

B3DMessageFilter filter = new B3DMessageFilter(render_target_control.Handle);
Application.AddMessageFilter(filter);

Blitz3DSDK.SetBlitz3DHWND(render_target_control.Handle.ToInt32());
Blitz3DSDK.BeginBlitz3D();

...

if (Blitz3DSDK.KeyHit(Blitz3DSDK.KEY_ESCAPE) == 1)
{
   ...
}

...

Blitz3DSDK.EndBlitz3D();

Application.RemoveMessageFilter(filter);