public RECT(RECT r)
 {
     this.Left = r.Left;
     this.Top = r.Top;
     this.Right = r.Right;
     this.Bottom = r.Bottom;
 }

 public static extern int DrawFocusRect(HDC hdc, ref RECT lpRect);

 public static extern int UnionRect(ref RECT lpDestRect, ref RECT lpSrc1Rect, ref RECT lpSrc2Rect);

 public static extern short TileWindows(HWND hwndParent, int wHow, ref RECT lpRect, int cKids, ref int lpKids);

 public static extern int SetRectEmpty(ref RECT lpRect);

 public static extern int ScrollWindowEx(HWND hwnd, int dx, int dy, ref RECT lprcScroll, ref RECT lprcClip, HANDLE hrgnUpdate, ref RECT lprcUpdate, int fuScroll);

 public static extern int ScrollDC(HDC hdc, int dx, int dy, ref RECT lprcScroll, ref RECT lprcClip, HANDLE hrgnUpdate, ref RECT lprcUpdate);

 public static extern int PtInRect(ref RECT lpRect, int ptX, int ptY);

 public static extern int GetClipCursor(out RECT lprc);

 public static extern int GetClientRect(HWND hwnd, ref RECT lpRect);

 public static extern int FrameRect(HDC hdc, ref RECT lpRect, HANDLE hBrush);

 public static extern int EqualRect(ref RECT lpRect1, ref RECT lpRect2);

 public static extern int DrawTextEx(HWND hdc, string lpsz, int n, ref RECT lpRect, int un, ref DRAWTEXTPARAMS lpDrawTextParams);

 public static extern int DrawText(HDC hdc, string lpStr, int nCount, ref RECT lpRect, int wFormat);

 public static extern int DrawFrameControl(HWND hdc, ref RECT lpRect, int un1, int un2);

 public static extern int MapDialogRect(HANDLE hDlg, ref RECT lpRect);

 public static extern int OffsetRect(ref RECT lpRect, int x, int y);

 public static extern int GetMenuItemRect(HWND hwnd, HANDLE hMenu, int uItem, ref RECT lprcItem);

 public static extern int RedrawWindow(HWND hwnd, ref RECT lprcUpdate, HANDLE hrgnUpdate, int fuRedraw);

 public static extern int GetUpdateRect(HWND hwnd, ref RECT lpRect, int bErase);