如何用idapython脚本获取字符串窗口的数据并写入文件

def GainStrWindow():
op = strwinsetup_t()
op.strtypes=ASCSTR_C
op.minlen = 4
set_strlist_options(op)
num = get_strlist_qty()
idx = 0
fl = open('D:\\string.txt', 'w')
while idx < num:
if wasBreak():
print 'Cancelled'
break
strinfo = string_info_t()
get_strlist_item(idx, strinfo)
strcont = GetString(strinfo.ea, strinfo.length, strinfo.type)
straddr = hex(strinfo.ea)
straddr = straddr[:len(straddr)-1]
fl.write(straddr)
fl.write("\t")
fl.write(strcont)
fl.write("\r\n")
fl.flush()
idx = idx+1
continue
fl.close()
return