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public struct POINTAPI
{
   public int x;
   public int y;
}
public static void GetWindowfromPoint(ref int hwnd,ref StringBuilder winText,ref StringBuilder clsName,ref StringBuilder pText)
{
  int parentHandle=0;
  int maxLen=128;
  POINTAPI pnt = new POINTAPI();
  parentHandle=GetCursorPos(ref pnt);
  hwnd=WindowfromPoint(pnt.x,pnt.y);
  winText =new StringBuilder(maxLen);
  parentHandle=GetWindowText(hwnd,winText,maxLen);
  clsName=new StringBuilder(maxLen);
  parentHandle=GetClassName(hwnd,clsName,maxLen);
  pText=new StringBuilder(maxLen);
  parentHandle=GetParent(hwnd);
  parentHandle=GetWindowText(parentHandle,pText,maxLen);
}