Problem in using 'ImessageFilter' Interface

[Ashish Gupra]

Hi,

I want to use 'IMessageFilter' interface to monitor my Key and mouse events to let me know the idle time of my application.

But this interface nt works fine. 'PreFilterMessage' function of this interface shows that in every specified time 'MouseMove' event occurs even if there is not movement in mouse.

Also If i open a Modal form from that application than this interface does not give messages related to mousemove event in all the previous forms open in this application.

I also prepare a class that uses API's to hook my keyboard and mouse event. This works fine.

But i want to use IMessageFilter in my application.

Please help me.

Regards,
Ashish

[tlhintoq]

Hi,

I want to use 'IMessageFilter' interface to monitor my Key and mouse events to let me know the idle time of my application.

But this interface nt works fine. 'PreFilterMessage' function of this interface shows that in every specified time 'MouseMove' event occurs even if there is not movement in mouse.

Also If i open a Modal form from that application than this interface does not give messages related to mousemove event in all the previous forms open in this application.

I also prepare a class that uses API's to hook my keyboard and mouse event. This works fine.

But i want to use IMessageFilter in my application.

Please help me.

Regards,
Ashish

As if by magic...
http://www.codeproject.com/KB/miscct...tion_Idle.aspx

[Ashish Gupra]

As if by magic...
http://www.codeproject.com/KB/miscct...tion_Idle.aspx

hi

Thanks for reply and Sorry for my late response.

The code given in Code Project link was not working well. I have modified that code according to me, it doesn't work. Following is my modified code:

public bool PreFilterMessage(ref Message m)
{
// Just to see the messages.
Console.WriteLine(DateTime.Now + " " + m.ToString());
switch (m.Msg)
{
case WM_KEYDOWN:
lastKeyOrMouse = DateTime.Now;
break;

case WM_KEYUP:
lastKeyOrMouse = DateTime.Now;
break;

case WM_LBUTTONDBLCLK:
lastKeyOrMouse = DateTime.Now;
break;

case WM_LBUTTONDOWN:
lastKeyOrMouse = DateTime.Now;
break;

case WM_LBUTTONUP:
lastKeyOrMouse = DateTime.Now;
break;

case WM_MBUTTONDBLCLK:
lastKeyOrMouse = DateTime.Now;
break;

case WM_MBUTTONDOWN:
lastKeyOrMouse = DateTime.Now;
break;

case WM_MBUTTONUP:
lastKeyOrMouse = DateTime.Now;
break;

case WM_MOUSEMOVE:
lastKeyOrMouse = DateTime.Now;
break;

case WM_MOUSEWHEEL:
lastKeyOrMouse = DateTime.Now;
break;

case WM_RBUTTONDBLCLK:
lastKeyOrMouse = DateTime.Now;
break;

case WM_RBUTTONDOWN:
lastKeyOrMouse = DateTime.Now;
break;

case WM_RBUTTONUP:
lastKeyOrMouse = DateTime.Now;
break;

case WM_SYSKEYDOWN:
lastKeyOrMouse = DateTime.Now;
break;

case WM_SYSKEYUP:
lastKeyOrMouse = DateTime.Now;
break;

case WM_XBUTTONDBLCLK:
lastKeyOrMouse = DateTime.Now;
break;

case WM_XBUTTONDOWN:
lastKeyOrMouse = DateTime.Now;
break;

case WM_XBUTTONUP:
lastKeyOrMouse = DateTime.Now;
break;
}
return false;
}


Previously it was looks like the following code:

public bool PreFilterMessage(ref Message m)
{
switch (m.Msg)
{
case WM_KEYDOWN:
case WM_KEYUP:
case WM_LBUTTONDBLCLK:
case WM_LBUTTONDOWN:
case WM_LBUTTONUP:
case WM_MBUTTONDBLCLK:
case WM_MBUTTONDOWN:
case WM_MBUTTONUP:
case WM_MOUSEMOVE:
case WM_MOUSEWHEEL:
case WM_RBUTTONDBLCLK:
case WM_RBUTTONDOWN:
case WM_RBUTTONUP:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
case WM_XBUTTONDBLCLK:
case WM_XBUTTONDOWN:
case WM_XBUTTONUP:
lastKeyOrMouse = DateTime.Now;
break;
}
return false;
}


If my mouse is upon form then MouseMove event occurs in a regular interval, even if no activity done by mouse. My problem still exists.

Regards,
Ashish

[tlhintoq]

hi

Thanks for reply and Sorry for my late response.

The code given in Code Project link was not working well. I have modified that code according to me, it doesn't work. Following is my modified code:
\

        public bool PreFilterMessage(ref Message m)
        {
            // Just to see the messages.
            Console.WriteLine(DateTime.Now + "  " + m.ToString());
            switch (m.Msg)
            {
                case WM_KEYDOWN:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_KEYUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_LBUTTONDBLCLK:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_LBUTTONDOWN:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_LBUTTONUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_MBUTTONDBLCLK:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_MBUTTONDOWN:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_MBUTTONUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_MOUSEMOVE:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_MOUSEWHEEL:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_RBUTTONDBLCLK:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_RBUTTONDOWN:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_RBUTTONUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_SYSKEYDOWN:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_SYSKEYUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_XBUTTONDBLCLK:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_XBUTTONDOWN:
                    lastKeyOrMouse = DateTime.Now;
                    break;
 
                case WM_XBUTTONUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
            }
            return false;
        }
 

Previously it was looks like the following code:

        public bool PreFilterMessage(ref Message m)
        {
           switch (m.Msg)
            {
                case WM_KEYDOWN:
                case WM_KEYUP:
                case WM_LBUTTONDBLCLK:
                case WM_LBUTTONDOWN:
                case WM_LBUTTONUP:
                case WM_MBUTTONDBLCLK:
                case WM_MBUTTONDOWN:
                case WM_MBUTTONUP:
                case WM_MOUSEMOVE:
                case WM_MOUSEWHEEL:
                case WM_RBUTTONDBLCLK:
                case WM_RBUTTONDOWN:
                case WM_RBUTTONUP:
                case WM_SYSKEYDOWN:
                case WM_SYSKEYUP:
                case WM_XBUTTONDBLCLK:
                case WM_XBUTTONDOWN:
                case WM_XBUTTONUP:
                    lastKeyOrMouse = DateTime.Now;
                    break;
            }
            return false;
        }
 

If my mouse is upon form then MouseMove event occurs in a regular interval, even if no activity done by mouse. My problem still exists.

Regards,
Ashish

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. It helps a bunch. Its the button with a '#' on it. More on tags. They're cool. Check'em out.

Just because your hand isn't on the mouse, doesn't mean there isn't mouse movement. I have seen my wife's laptop wake from mouse movement when she isn't at the desk: Just from the air conditioner blowing on the dangling mouse cord. If you want to really test that there is no mouse movement: Unplug it from your PC. If you still get mouse movement events then there is a true problem.

You could also qualify the mouse movements to make sure it isn't miniscule movements from environmental vibration like the drive motors and cooling fans of your PC. Keep track of the mouse position. Qualify a 'real' move as more than just 1-2 point values within 50 milliseconds. If a person is moving the mouse its going to be big moves in a short time. If it isn't a qualified movement then you don't change your member variable 'lastKeyOrMouse'.

Question: What is the point of your method always returning 'false'? If you are always going to return the same value you might as well just have it be void and return nothing at all. The point to having a method return some value is to tell you something significant. For example if you set a bool to false before the Switch statement any of the cases could turn it to True, then you always return that variable. If the returned value is still false, then none of the cases were executed. If the method returns 'true' then a case was used.

If you had the method return an int, you could return a unique number that even tells WHICH case statement was executed, and thus which mouse or key event took place.

Between lines 25 and 26 insert a line that prints the message value of m to the console, so you can watch what is going on.

[scoco]

The implementation requires a bool return value from PreFilterMessage(), 'false' tells the framework to pass on the message to the default handler, returning 'true' prevents any further handling.