[DllImport("MF_DLL.DLL")]
        public static extern int mf_Connect();连接读卡器
        [DllImport("MF_DLL.DLL")]     
        public static extern bool mf_Disconnect();断开
        [DllImport("MF_DLL.DLL")]      
        public static extern int mf_ReadRfid(StringBuilder id, StringBuilder type);读卡
        private void button8_Click(object sender, EventArgs e)
        {
            textBox5.Text = "";
            mf_Connect();
            StringBuilder  id1 = new StringBuilder();
            StringBuilder type1 = new StringBuilder();
            mf_ReadRfid(id1, type1);
            this.textBox5.Text =type1 . ToString ();
             this.textBox5.Text =id1 . ToString ();
            mf_Disconnect();
 
        }
这是调用的一个开发包！现在怎么type1是乱码
id1是空的呀
int mf_ReadRfid(unsigned char *id, unsigned char *type);
// 读ID卡卡号
// id=卡号4字节数据,高字节在前
// type=厂商代码
这是说明
麻烦各位给指点一下