Moving Window with Mine

Is there a way to process code while a window's being dragged without stopping the user's drag movement?

I need to keep a foreign window (App B) in the same position relative to my window (App A). So when I move App A, App B needs to move at the same time. I'm subclassing my app and using SetWindowPos to move App B. This works, but this processing within App A kills the drag movement, so I have to click App A and start dragging again, which isn't user-friendly.

Thanks for any help.

I'm sure I replied to this last night, maybe I forgot to hit submit or something

From your previous posts you say that you have successfully subclassed foreign windows with some C Dlls, so we'll be doing that.

set up your own message and trap it in the foreign window you want to move, something like WM_MoveMe = -100 (-ve numbers arn't used for message constants so you won't get a conflict) when you recieve this message move the window to the position specified.

in your window moving code use postmessage to move the window (postmessage doesn't wait for a return value)

that way all the legwork will be done in the foreign window process and you should be alright.

Hope his helps

Sam, thanks for the response, but I've removed the title bar from the foreign window so it doesn't move unless I tell it to from my window. This is triggered based on a message (WM_MOVE) from my window. I guess I could set up a separate executable to process it without interrupting my window, but I didn't want the extra overhead. I'm using SetWindowPos -- didn't think you could move a window using PostMessage.

p.s. I'm subclassing using Spyworks.