一个对话框有N个控件，怎样循环获得它们的RECT区域？假设控件的ID未知，N亦未知？我所知道的有GETDLGITEM（ID〕，但必须知道ID，可无法循环？

　　用API函数Enum

　　ChildWindows The EnumChildWindows function enumerates the child windows that belong to the specified parent window by passing the handle of each child window, in turn, to an application-defined callback function. EnumChildWindows continues until the last child window is enumerated or the callback function returns FALSE.

BOOL EnumChildWindows(

　　HWND hWndParent, // handle to parent window

　　WNDENUMPROC lpEnumFunc, // pointer to callback function

　　LPARAM lParam // application-defined value

);

Parameters

　　hWndParent

　　Identifies the parent window whose child windows are to be enumerated.

　　lpEnumFunc

　　Points to an application-defined callback function.

　　　　For more information about the callback function,

　　see the EnumChildProc callback function.

lParam

　　Specifies a 32-bit, application-defined value to be

　　passed to the callback function.


Return Values

　　If the function succeeds, the return value is nonzero.

　　If the function fails, the return value is zero.