data window 有关问题

data window 问题,在线求救
datawindow   state_child
int   rtncode
string   ls_filter
if   dwo.name   = "earning_id "   then
rtncode   =   dw_gathering_list.GetChild( 'earning_id ',   state_child)

if   rtncode   =   -1   then
messagebox( "提示: ", "没有定义字数据窗口!!! ")
return
end   if
ls_filter   = "subject_id   like   ' "+data+ "   % ' "
state_child.setfilter(ls_filter)
state_child.filter()
end   if
我在     dw_gathering   的earning_id列设edit属性style   type   为dropdownDW,我在dw_gathering_list的editchanged下写入以上代码,但这段代码语法检查不能通过,救教高手指导!!!

------解决方案--------------------
datawindowchild state_child 此处定义不正确！
int rtncode
string ls_filter
if dwo.name = "earning_id " then
rtncode = dw_gathering_list.GetChild( 'earning_id ', state_child)

if rtncode = -1 then
messagebox( "提示: ", "没有定义字数据窗口!!! ")
return
end if
ls_filter = "subject_id like ' "+data+ " % ' "
state_child.setfilter(ls_filter)
state_child.filter()
end if