调试周立功USBCAN提示“尝试读取或写入受保护的内存”错误

Question

调试界面CAN

Answer 1

这是我的接受处理线程
uint clear_buf = 0;
            string timeStamp = string.Empty;
            string frameFormat = string.Empty;
            string frameType = string.Empty;
            string data = string.Empty;
            #region 接收缓冲初始化
            uint len = 0;
            long index = 0;
            CANApi.VCI_ERR_INFO errInfo = new CANApi.VCI_ERR_INFO();
            errInfo.Passive_ErrData = new byte[10];
            //CANApi.VCI_CAN_OBJ[] frameInfos = new CANApi.VCI_CAN_OBJ[20];
            #endregion
            try
            {
                    for (index = 0; index < 251; index++) //if (true)//while (true)
                    {
                        if (!(My_Can_Parameter.Is_Connect()))
                            break;                        if (index % 50 == 0)
                        {
                            clear_buf = CANApi.VCI_ClearBuffer(My_Can_Parameter.Get_DeviceType(), My_Can_Parameter.Get_DeviceIndex(), My_Can_Parameter.Get_CanIndex());
                            if (250 == index)
                                index = 0;
                        }
                        len = 0;
                        len = CANApi.VCI_Receive(My_Can_Parameter.Get_DeviceType(), My_Can_Parameter.Get_DeviceIndex(), My_Can_Parameter.Get_CanIndex(), ref frameInfos[0], 30, 10);
                        if (len <= 0)
                        {
                            CANApi.VCI_ReadErrInfo(My_Can_Parameter.Get_DeviceType(), My_Can_Parameter.Get_DeviceIndex(), My_Can_Parameter.Get_CanIndex(), ref errInfo);
                        }
                        else
                        {
                            for (int i = 0; i < len; i++)
                            {
                                if (i >= frameInfos.Length) break;
                                CANApi.VCI_CAN_OBJ frame = frameInfos[i];
                                Battery_Display(frame);
                                #region 接收帧显示
                                string frameID = string.Format("{0:X8}", frame.ID);
                                if (frame.TimeFlag == 0)
                                {
                                    timeStamp = "无";
                                }
                                else
                                {
                                    timeStamp = string.Format("{0:X8}", frame.TimeStamp);
                                }
                                if (frame.RemoteFlag == 0)
                                {
                                    frameFormat = "数据帧";
                                }
                                else
                                {
                                    frameFormat = "远程帧";
                                }                                if (frame.ExternFlag == 0)
                                {
                                    frameType = "标准帧";
                                }
                                else
                                {
                                    frameType = "扩展帧";
                                }
                                if (frame.RemoteFlag == 0)
                                {
                                    StringBuilder sbData = new StringBuilder();
                                    for (int j = 0; j < frame.DataLen; j++)
                                    {
                                        if (frame.Data.Length <= j) break;
                                        sbData.AppendFormat("{0:X2} ", frame.Data[j]);
                                    }
                                    data = sbData.ToString();
                                }                                if (frameID != "00000000")
                                {
                                    if (!My_Can_Parameter.Halt_Dis)
                                    {
                                        string frameCount = string.Empty;
                                        frame_count++;
                                        frameCount = string.Format("{0:X6}", frame_count);
                                        this.NotifyReceiveFrame(new FrameInfo(frameCount, frameID, timeStamp, frameFormat, frameType, data));
                                    }
                                }
                                #endregion
                            }
                        }
                        Thread.Sleep(5);
                    }
            }
            catch (Exception ee)
            {            }
        }

Answer 2

要看手册，ControlCAN.dll的函数接收的缓冲区最大多少？是否允许函数重入/多线程执行。

Answer 3

跟拒我的经验是CANApi里空指针或瞎指针导致的，查查CANApi的代码吧。

Answer 4

是这样的，我曾经在vb上面调通过周立功usbcan，并且很稳定，所以不太可能是api的问题，现在的操作方式也一样，
想请教下你，C#线程操作，你看下我的线程处理是不是有不恰当的地方

Answer 5

是这样的，我曾经在vb上面调通过周立功usbcan，并且很稳定，所以不太可能是api的问题，现在的操作方式也一样，
想请教下你，C#线程操作，你看下我的线程处理是不是有不恰当的地方

Answer 6

以前在VB上面操作过这个api，数据量很大也很稳定啊，您看看我的线程处理是否有不妥的地方