C# - Determine if user is moving a window

I am going to be checking if the user is moving any window around (my application does n开发者_C百科ot have an interface) and respond accordingly. What do you think is the best way to do this? Can I determine if the user is clicking on a titlebar? Can I determine if a window is being moved? I then need to grab the hWnd of the window after I know it's being moved.

To get notifications for all windows, not just Windows Forms ones, you'll need to use a hook set by the SetWindowsHookEx() API function. You'll need a WH_CALLWNDPROC hook so you can see the WM_MOVE message that Windows sends to the window.

Unfortunately, that's a global hook. The code that implements the hook callback needs to be packaged into a DLL so that it can be injected into all target processes. That shoots a hole into your plans to use C# for this, you can't inject the CLR. The DLL must be written in unmanaged code.

This code project offers an approach, including the unmanaged injectable DLL you'll need.

here is a technique to spy on window handles. You can inspect all the handles which are open and wait for the move messages.

EDIT

.NET spy code.