使用 C++ 从磁卡 reader MT188 读取数据

Question

我正在尝试从磁卡读取数据reader它的型号是MT188。 Card reader 带有一个 DLL 和一个 DLL 中函数的文档。读卡过程如下

HANDLE APIENTRY CommOpenWithBaut(UINT nPort, UINT _data)

open serial Communications example : CommOpenWithBaut(1,9600);.

int APIENTRY CarderCheckSt(HANDLE hComHandle, unsigned char &PewSt, unsigned char &CardType, unsigned char &CardSt, unsigned char &PowerSt)

check Device status.

int APIENTRY MagRead(HANDLE hComHandle,BYTE *MagData,int &lenth)

read Magnetic card data

int APIENTRY CommClose(HANDLE hComHandle);

Close port after the card is read.

每个函数都有一个 return 值。这是 cout<<Magread<<endl; 的示例，它给出了 00007FF792E41258 的值。我究竟做错了什么？如何正确使用这些功能？

这是我的主要内容。

int main(int arg, char* argc[])
{
    CommOpenWithBaut(1,9600);
    cout<< "This is the cards data:  " << MagRead << endl;
    cout << "This is the cards status:  " << CarderCheckSt << endl;
    CommClose;
}

更新：

我尝试运行程序时收到此错误：

LNK2019 unresolved external symbol "__declspec(dllimport) void * __cdecl CommOpenWithBaut(unsigned int,unsigned int)" (__imp_?CommOpenWithBaut@@YAPEAXII@Z) referenced in function main

这是我的头文件：

#include <iostream>
#include <windows.h>

#ifdef Modulev188_EXPORTS
#define Modulev188_API __declspec(dllexport)
#else
#define Modulev188_API __declspec(dllimport)
#endif

Modulev188_API HANDLE  CommOpenWithBaut(UINT nPort, UINT _data);
Modulev188_API int  CommClose(HANDLE hComHandle);
Modulev188_API int  CarderCheckSt(HANDLE hComHandle, unsigned char& PewSt, unsigned char& CardType, unsigned char& CardSt, unsigned char& PowerSt);
Modulev188_API int  CarderVersion(HANDLE hComHandle, unsigned char* VersionNo, int& lenth);
//DLLEXPORT int WINAPI ContactCPU_ColdReset(HANDLE hComHandle, BYTE* _CPUTYPE, BYTE* _exData, int* _exdataLen);
//DLLEXPORT int WINAPI ContactCPU_Dormancy(HANDLE hComHandle);
Modulev188_API int  ContactCPU_CAPDU(HANDLE hComHandle, int _dataLen, BYTE* _APDUData, BYTE* _exData, int* _exdataLen);
Modulev188_API int  SIM_Reset(HANDLE hComHandle, BYTE _VOLTAGE, BYTE _SIMNo, BYTE& _SIMTYPE, BYTE* _exData, int& _exdataLen);
Modulev188_API int  SIM_C_APDU(HANDLE hComHandle, BYTE SIMNo, int _dataLen, BYTE* _APDUData, BYTE* _exData, int& _exdataLen);
Modulev188_API int  SIM_CardClose(HANDLE hComHandle);
Modulev188_API int  MagRead(HANDLE hComHandle, BYTE* MagData, int& lenth);
Modulev188_API int  MagCleaner(HANDLE hComHandle);

Answer 1

您实际上并没有调用 MagRead、CarderCheckSt 或 CommClose，因为您没有将它们作为带有括号和参数的函数来调用。您只是将它们作为函数指针打印出来，因此您看到的值代表函数入口点的地址。

相反，您需要为每个函数提供合适的参数。从 'open' 函数中，您将获得一个传递给所有后续函数的句柄。

#include <iostream>

extern "C" {    
    #include <mt188.h> // The header for your C library
}

using namespace std;

int main(int argc, char* argv[])
{
    // Open the device

    HANDLE port = CommOpenWithBaut(1, 9600);

    if (port == 0)
    {
        cerr << "Cannot open device";
        return -1;
    }

    // Read status

    unsigned char PewSt = 0;
    unsigned char CardType = 0;
    unsigned char CardSt = 0;
    unsigned char PowerSt = 0;

    int rc = CarderCheckSt(port, PewSt, CardType, CardSt, PowerSt);

    // Read buffer of data

    int bufferSize = 128;
    BYTE buffer[bufferSize];

    int bytesRead = MagRead(port, buffer, bufferSize);

    //

    CommClose(port);

    return 0;
}

使用 C++ 从磁卡 reader MT188 读取数据

Reading DATA from Magnetic card reader MT188 using C++

c++

dll

serial-port