qt5 显示调用CAN卡第三方库并调用函数

Qt调用CAN卡DLL教程

最新推荐文章于 2025-10-29 11:09:39 发布

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Qt调用第三方库一般有两种方式，显示和隐式。这里主要介绍显示调用CAN卡第三方库（因为隐式调用CAN失败了，太懒，不想弄了)，简单介绍隐式调用。

一、隐式调用

创建工程
将xx.h和xx.lib放入当前工程目录
xx.dll文件放入debug和release文件夹中（编译后自动生成）
工程下打开.pro文件，右键选择“添加库”
选择“外部库”、“动态库”
工程添加头文件xx.h
头文件包含“xx.h"

二、显式调用

1、创建工程

2、CAN.lib文件夹里有几个文件如下。Kerneldlls中有很多xx.dll文件，如下。将使用的CAN类型对应的.dll文件复制（我使用的是usbcan，所以是usbcan.dll），放到工作目录下，同时复制ControlCAN.h到工作目录下。

3、包含ControlCAN.h到工程中

4、使用QLibrary加载动态库

QLibrary lib("usbcan.dll");
    if(true==lib.load())
        qDebug()<<"dll load ok";

5、声明与usbcan.dll里的函数功能相对应的函数，在头文件中添加：

public:
    typedef DWORD(__stdcall VCI_OpenDevice)(DWORD,DWORD,DWORD);
    typedef DWORD(__stdcall VCI_ResetCAN)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd);
    typedef DWORD(__stdcall VCI_CloseDevice)(DWORD DeviceType,DWORD DeviceInd);
    typedef DWORD(__stdcall VCI_InitCAN)(DWORD DeviceType, DWORD DeviceInd, DWORD CANInd, PVCI_INIT_CONFIG pInitConfig);
    typedef DWORD(__stdcall VCI_StartCAN)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd);
    typedef ULONG(__stdcall VCI_Transmit)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd,PVCI_CAN_OBJ pSend,ULONG Len);

    typedef ULONG(__stdcall VCI_Receive)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd,PVCI_CAN_OBJ pReceive,ULONG Len,INT WaitTime/*=-1*/);
    typedef ULONG(__stdcall VCI_GetReceiveNum)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd);
    typedef DWORD(__stdcall VCI_ClearBuffer)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd);
    typedef DWORD(__stdcall VCI_ReadErrInfo)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd,PVCI_ERR_INFO pErrInfo);
    typedef DWORD(__stdcall VCI_ReadCANStatus)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd,PVCI_CAN_STATUS pCANStatus);
    typedef DWORD(__stdcall VCI_SetReference)(DWORD DeviceType,DWORD DeviceInd,DWORD CANInd,DWORD RefType,PVOID pData);
    typedef DWORD(__stdcall VCI_ReadBoardInfo)(DWORD DeviceType,DWORD DeviceInd,PVCI_BOARD_INFO pInfo);

6、声明函数对象，如

    VCI_OpenDevice *pOpenDevice;
    VCI_ResetCAN *pResetCAN;
    VCI_CloseDevice *pCloseDevice;
    VCI_InitCAN *pInitCAN;
    VCI_StartCAN *pStartCAN;
    VCI_Transmit *pTransmitCAN;
    VCI_Receive *pReceive;
    VCI_GetReceiveNum *pGetReceiveNum;
    VCI_ClearBuffer *pClearBuffer;
    VCI_ReadErrInfo *pReadErrInfoCAN;
    VCI_ReadCANStatus *pReadCANStatus;
    VCI_SetReference *pSetReference;
    VCI_ReadBoardInfo *pReadBoardInfo;

7、将usbcan.dll中的函数功能分解到自定义对应的函数中，源文件中：

pOpenDevice = (VCI_OpenDevice *)lib.resolve("VCI_OpenDevice");
    pCloseDevice = (VCI_CloseDevice *)lib.resolve("VCI_CloseDevice");
    pInitCAN = (VCI_InitCAN *)lib.resolve("VCI_InitCAN");
    pStartCAN = (VCI_StartCAN *)lib.resolve("VCI_StartCAN");
    pTransmitCAN = (VCI_Transmit *)lib.resolve("VCI_Transmit");
    pReceive = (VCI_Receive *)lib.resolve("VCI_Receive");
    pGetReceiveNum = (VCI_GetReceiveNum *)lib.resolve("VCI_GetReceiveNum");
    pClearBuffer = (VCI_ClearBuffer *)lib.resolve("VCI_ClearBuffer");
    pReadErrInfoCAN = (VCI_ReadErrInfo*)lib.resolve("VCI_ReadErrInfo");
    pResetCAN=(VCI_ResetCAN *)lib.resolve("VCI_ResetCAN");
    pSetReference=(VCI_SetReference *)lib.resolve("VCI_SetReference");
    pReadBoardInfo=(VCI_ReadBoardInfo *)lib.resolve("VCI_ReadBoardInfo");
    pReadCANStatus=(VCI_ReadCANStatus *)lib.resolve("VCI_ReadCANStatus");