jacob 调用出错急等！

下面是代码：
import com.jacob.com.*;
import com.jacob.activeX.*;

public class Jao
{
  public static String  java_Dll(String str,String s,int n){
    String res="";
    try {
        ActiveXComponent pp = new ActiveXComponent("segposCOM.seg");
     Dispatch myCom =(Dispatch) pp.getObject(); //生成一个对象

     Variant result = Dispatch.call( myCom, "SegChs", new Variant(str),new Variant(s),new Variant(n)) ;
     System.out.println(result.toString());
res=result.toString();
    }catch (Exception e) {
     res="";
        e.printStackTrace();
    }
    return res;
  }
  public static void main(String[] args) {
String str="我是中国人";
String s="_";
int n=1;
java_Dll(str, s, n);
}
}
报错信息如下：
com.jacob.com.ComFailException: A COM exception has been encountered:
At Invoke of: SegChs
Description: 内存分配访问无效。

at com.jacob.com.Dispatch.invokev(Native Method)
at com.jacob.com.Dispatch.invokev(Dispatch.java:858)
at com.jacob.com.Dispatch.callN(Dispatch.java:455)
at com.jacob.com.Dispatch.call(Dispatch.java:571)
at com.huizhi.util.Jao.java_Dll(Jao.java:14)
at com.huizhi.util.Jao.main(Jao.java:27)
如图：

--------------------编程问答-------------------- 先谢谢大家了 --------------------编程问答-------------------- 请大家帮帮忙吧 --------------------编程问答-------------------- 怎么没人回答呢 --------------------编程问答--------------------

只能说，调用方法没错，是不是DLL出问题了，最近也在研究调用DLL，看看我帖子问题有否遇到过

补充：Java ,  Eclipse

jacob 调用出错 急等！

jacob 调用出错急等！