棘手问题

我这里有个打印机vb谢的控件，现在用javascript调用打印中文是乱码，函数原形
Public Function SendDataToUsb(MessageContent() As Byte, MessageNum As Long) As Boolean   MessageContent() As Byte: Send data array
   MessageNum As Long:       Send data total
   The successful return of true, or false on failure.
怎么调用才对，希望哪个大虾帮帮忙，谢谢了