使用python来调用CAN通讯的DLL实现方法

#ifndef CONTROLCAN_H#define CONTROLCAN_H ////文件版本：v2.00 20150920//#include <cvidef.h>	//使用CVI平台开发，请使用该语句。 //接口卡类型定义 #define VCI_USBCAN1		3#define VCI_USBCAN2		4#define VCI_USBCAN2A		4 #define VCI_USBCAN_E_U 		20#define VCI_USBCAN_2E_U 	21   //函数调用返回状态值#define	STATUS_OK					1#define STATUS_ERR					0	/*------------------------------------------------兼容ZLG的函数及数据类型------------------------------------------------*///1.ZLGCAN系列接口卡信息的数据类型。typedef struct _VCI_BOARD_INFO{		unsigned short	hw_Version;		unsigned short	fw_Version;		unsigned short	dr_Version;		unsigned short	in_Version;		unsigned short	irq_Num;		unsigned char	can_Num;		char	str_Serial_Num[20];		char	str_hw_Type[40];		unsigned short	Reserved[4];} VCI_BOARD_INFO,*PVCI_BOARD_INFO;  //2.定义CAN信息帧的数据类型。typedef struct _VCI_CAN_OBJ{	unsigned int	ID;	unsigned int	TimeStamp;	unsigned char	TimeFlag;	unsigned char	SendType;	unsigned char	RemoteFlag;//是否是远程帧	unsigned char	ExternFlag;//是否是扩展帧	unsigned char	DataLen;	unsigned char	Data[8];	unsigned char	Reserved[3];}VCI_CAN_OBJ,*PVCI_CAN_OBJ; //3.定义初始化CAN的数据类型typedef struct _VCI_INIT_CONFIG{	unsigned long	AccCode;	unsigned long	AccMask;	unsigned long	Reserved;	unsigned char	Filter;	unsigned char	Timing0;		unsigned char	Timing1;		unsigned char	Mode;}VCI_INIT_CONFIG,*PVCI_INIT_CONFIG; ///////// new add struct for filter /////////typedef struct _VCI_FILTER_RECORD{	unsigned long	ExtFrame;	//是否为扩展帧	unsigned long	Start;	unsigned long	End;}VCI_FILTER_RECORD,*PVCI_FILTER_RECORD; #define EXTERNC		extern "C" EXTERNC unsigned long __stdcall VCI_OpenDevice(unsigned long DeviceType,unsigned long DeviceInd,unsigned long Reserved);EXTERNC unsigned long __stdcall VCI_CloseDevice(unsigned long DeviceType,unsigned long DeviceInd);EXTERNC unsigned long __stdcall VCI_InitCAN(unsigned long DeviceType, unsigned long DeviceInd, unsigned long CANInd, PVCI_INIT_CONFIG pInitConfig); EXTERNC unsigned long __stdcall VCI_ReadBoardInfo(unsigned long DeviceType,unsigned long DeviceInd,PVCI_BOARD_INFO pInfo); EXTERNC unsigned long __stdcall VCI_SetReference(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd,unsigned long RefType,void* pData); EXTERNC unsigned long __stdcall VCI_GetReceiveNum(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd);EXTERNC unsigned long __stdcall VCI_ClearBuffer(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd); EXTERNC unsigned long __stdcall VCI_StartCAN(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd);EXTERNC unsigned long __stdcall VCI_ResetCAN(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd); EXTERNC unsigned long __stdcall VCI_Transmit(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd,PVCI_CAN_OBJ pSend,unsigned long Len);EXTERNC unsigned long __stdcall VCI_Receive(unsigned long DeviceType,unsigned long DeviceInd,unsigned long CANInd,PVCI_CAN_OBJ pReceive,unsigned long Len,int WaitTime);  /*------------------------------------------------其他补充函数及数据结构描述------------------------------------------------*/ //USB-CAN总线适配器板卡信息的数据类型1，该类型为VCI_FindUsbDevice函数的返回参数。typedef struct _VCI_BOARD_INFO1{	unsigned long	hw_Version;	unsigned long	fw_Version;	unsigned long	dr_Version;	unsigned long	in_Version;	unsigned long	irq_Num;	unsigned char	can_Num;	unsigned char	Reserved;	char	str_Serial_Num[8];	char	str_hw_Type[16];	char	str_Usb_Serial[4][4];} VCI_BOARD_INFO1,*PVCI_BOARD_INFO1; //USB-CAN总线适配器板卡信息的数据类型2，该类型为VCI_FindUsbDevice函数的返回参数。为扩展更多的设备typedef struct _VCI_BOARD_INFO2{	unsigned long	hw_Version;	unsigned long	fw_Version;	unsigned long	dr_Version;	unsigned long	in_Version;	unsigned long	irq_Num;	unsigned char	can_Num;	unsigned char	Reserved;	char	str_Serial_Num[8];	char	str_hw_Type[16];	char	str_Usb_Serial[10][4];} VCI_BOARD_INFO2,*PVCI_BOARD_INFO2;  #define EXTERNC		extern "C" EXTERNC unsigned long __stdcall VCI_GetReference2(unsigned long DevType,unsigned long DevIndex,unsigned long CANIndex,unsigned long Reserved,unsigned char *pData);EXTERNC unsigned long __stdcall VCI_SetReference2(unsigned long DevType,unsigned long DevIndex,unsigned long CANIndex,unsigned long RefType,unsigned char *pData);  EXTERNC unsigned long __stdcall VCI_ConnectDevice(unsigned long DevType,unsigned long DevIndex);EXTERNC unsigned long __stdcall VCI_UsbDeviceReset(unsigned long DevType,unsigned long DevIndex,unsigned long Reserved);EXTERNC unsigned long __stdcall VCI_FindUsbDevice(PVCI_BOARD_INFO1 pInfo);EXTERNC unsigned long __stdcall VCI_FindUsbDevice2(PVCI_BOARD_INFO2 pInfo);   #endif 

#python3.6 32位#https://blog.csdn.net/caimouse/article/details/51749579#开发人员：蔡军生（QQ：9073204） 深圳 2018-3-25#from ctypes import * VCI_USBCAN2A = 4STATUS_OK = 1class VCI_INIT_CONFIG(Structure):   _fields_ = [("AccCode", c_ulong),        ("AccMask", c_ulong),        ("Reserved", c_ulong),        ("Filter", c_ubyte),        ("Timing0", c_ubyte),        ("Timing1", c_ubyte),        ("Mode", c_ubyte)        ] class VCI_CAN_OBJ(Structure):   _fields_ = [("ID", c_uint),        ("TimeStamp", c_uint),        ("TimeFlag", c_ubyte),        ("SendType", c_ubyte),        ("RemoteFlag", c_ubyte),        ("ExternFlag", c_ubyte),        ("DataLen", c_ubyte),        ("Data", c_ubyte*8),        ("Reserved", c_ubyte*3)        ]  CanDLLName = 'ControlCAN.dll' #DLL是32位的，必须使用32位的PYTHONcanDLL = windll.LoadLibrary(CanDLLName)print(CanDLLName) ret = canDLL.VCI_OpenDevice(VCI_USBCAN2A, 0, 0)print(ret)if ret != STATUS_OK:  print('调用 VCI_OpenDevice出错/r/n') #初始0通道vci_initconfig = VCI_INIT_CONFIG(0x80000008, 0xFFFFFFFF, 0,                 2, 0x00, 0x1C, 0)ret = canDLL.VCI_InitCAN(VCI_USBCAN2A, 0, 0, byref(vci_initconfig))if ret != STATUS_OK:  print('调用 VCI_InitCAN出错/r/n') ret = canDLL.VCI_StartCAN(VCI_USBCAN2A, 0, 0)if ret != STATUS_OK:  print('调用 VCI_StartCAN出错/r/n') #初始1通道ret = canDLL.VCI_InitCAN(VCI_USBCAN2A, 0, 1, byref(vci_initconfig))if ret != STATUS_OK:  print('调用 VCI_InitCAN 1 出错/r/n') ret = canDLL.VCI_StartCAN(VCI_USBCAN2A, 0, 1)if ret != STATUS_OK:  print('调用 VCI_StartCAN 1 出错/r/n') #通道0发送数据ubyte_array = c_ubyte*8a = ubyte_array(1,2,3,4, 5, 6, 7, 64)ubyte_3array = c_ubyte*3b = ubyte_3array(0, 0 , 0)vci_can_obj = VCI_CAN_OBJ(0x0, 0, 0, 1, 0, 0, 8, a, b) ret = canDLL.VCI_Transmit(VCI_USBCAN2A, 0, 0, byref(vci_can_obj), 1)if ret != STATUS_OK:  print('调用 VCI_Transmit 出错/r/n') #通道1接收数据a = ubyte_array(0, 0, 0, 0, 0, 0, 0, 0)vci_can_obj = VCI_CAN_OBJ(0x0, 0, 0, 1, 0, 0, 8, a, b)ret = canDLL.VCI_Receive(VCI_USBCAN2A, 0, 1, byref(vci_can_obj), 1, 0)print(ret)while ret <= 0:  print('调用 VCI_Receive 出错/r/n')  ret = canDLL.VCI_Receive(VCI_USBCAN2A, 0, 1, byref(vci_can_obj), 1, 0)if ret > 0:  print(vci_can_obj.DataLen)  print(list(vci_can_obj.Data)) #关闭canDLL.VCI_CloseDevice(VCI_USBCAN2A, 0)