200分求解!向CPU卡发送一条指令后如何得到返回的状态码？

[常遇道]

CPU卡发送一条指令的调用函数
int icc_instruction(unsigned char *ins_buff,unsigned char cmd_len,unsigned char *ret_buf);
功能描述：向CPU卡发送一条指令，同时获得该指令返回值
入口参数：
ins_buff--------指令缓冲区;
cmd_len --------指令长度;
ret_buf --------响应缓冲区，第一个字节存放响应数据的长度;
返回值：
-1----------通迅失败或设置密码验证未通过;
其它 -------CPU卡回送的状态码;
--------------------------------------------------------------------------------
const int arrarySize = 100;
byte [] cmdbuff = new byte[arrarySize];
byte [] retbuff = new byte[arrarySize];

cmdbuff[0] = 0x0; //nad
cmdbuff[1] = 0x40; //pcb
cmdbuff[2] = 0x29; //length 3－31
cmdbuff[3] = 0x80; //CLA create MF
cmdbuff[4] = 0xE0; //INS
cmdbuff[5] = 00; //Create MF 安装密钥
cmdbuff[6] = 00; //正在建立
cmdbuff[7] = 0x18; //LC
cmdbuff[8] = 0xFF; //8字节传输密钥start
cmdbuff[9] = 0xFF;
cmdbuff[10] = 0xFF;
cmdbuff[11] = 0xFF;
cmdbuff[12] = 0xFF;
cmdbuff[13] = 0xFF;
cmdbuff[14] = 0xFF;
cmdbuff[15] = 0xFF; //8字节传输密钥end
cmdbuff[16] = 0xFF; //权限,在MF下建立文件
cmdbuff[17] = 0xF; //目录文件的短文件标识符
cmdbuff[18] = 0x31; //1PAY.SYS.DDF01，EF名称
cmdbuff[19] = 0x50;
cmdbuff[20] = 0x41;
cmdbuff[21] = 0x59;
cmdbuff[22] = 0x2E;
cmdbuff[23] = 0x53;
cmdbuff[24] = 0x59;
cmdbuff[25] = 0x53;
cmdbuff[26] = 0x2E;
cmdbuff[27] = 0x44;
cmdbuff[28] = 0x44;
cmdbuff[29] = 0x46;
cmdbuff[30] = 0x30;
cmdbuff[31] = 0x31;
cmdbuff[32] = 0x0;

for(int i=0;i<32;i++)
{
cmdbuff[32] = (byte)(cmdbuff[i] ^ cmdbuff[32]);
}

return icc_instruction(cmdbuff,33,retbuff);
------------------------------------------------

现在的问题是如果得到CPU卡回送的状态码retbuff的返回值？

[chenhui530]

c++的还是C#的？？
怎么发到这里了啊

[嗷嗷叫的老马]

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