A Window Problem

When someone resizes i want the edit box to resize, but i dont how to get the size of the window. Any ideas?

Can you not use GetWindowRect

Code:

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;preserve eax and ebx
push eax
push ebx

;get the address of a rect structure
lea ebx, A_Rect_Structure

;fill it with the windows rectangle
push ebx
push HWND_OF_Window
call GetWindowRect

;Translate the coordinates into window coordinates
push ebx
push HWND_OF_Window
call ScreenToClient
inc ebx, 8
push ebx
push HWND_OF_Window
call GetWindowRect

;restore eax and ebx
pop ebx
pop eax

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I don't know If you have to clear the parameters off the call stack after calling an API, I didn't but If you need to you can. After this code the Left and Bottom parts of the Rect structure should be the window's width and height respectivley.