将指针传递给dll类函数

Question

我需要构建一个可执行文件来加载dll @ runtime并使用多个参数调用dll中的c ++函数。我已经看到很多例子告诉我如何传递参数，但在我的情况下它不完全相同。我需要传递3个参数。

1. 包含3个std::string元素的结构
2. 结构指针std::map和std::string，map std::string为关键，结构为值
3. 与std::unordered_map结构，其中std::string为关键字，std::string为值，部分bool为整数元素。

dll类派生自2个基类。例如：BaseClassA - ＆gt; BaseClassB - ＆gt; DerivedClassA

我已经创建了工厂函数并且正确地设置了所有__dllspec(dllexport)但是当我尝试创建DerivedClassA实例时，我得到了异常

Unhandled exception at 0x759FA6F2 in rte.exe: Microsoft C++ exception: std::length_error at memory location 0x016FF1C4

我的代码片段（dllhelp.h）：

#include <unordered_map>
#include <cinttypes>

typedef uint32_t   ID;

typedef ID EVENT_UID;

typedef struct {
    EVENT_UID m_unEventID;
    uint8_t  *m_ptrMemAddr;
    size_t    m_dataSize;
}stEvent_t;

typedef struct  {
    uint32_t    m_unOffset;
    uint32_t    m_unArraySize;
    std::string m_acTagName;
    std::string m_acTagValue;
    std::string m_acDataType;
} stTagElem_t;

typedef std::unordered_map<uint8_t, stTagElem_t> tagsList_t;

typedef struct  {
    EVENT_UID    m_unBindedEvent;
    uint16_t     m_unMemSize;
    tagsList_t   m_stTagsList;
    std::string  m_acMapTypeName;
} stElem_t;

typedef std::unordered_map<std::string, stElem_t> ElemList_t;

typedef struct  {
    std::string   m_acAppBlocName;
    std::string   m_acInstanceName;
    std::string   m_acDataMapInstanceName;
    std::string   m_acTypeName;
} stBlock_t;

typedef std::unordered_map<std::string, std::string > instanceTypeList_t;

typedef struct {
    bool               m_bIsItOutput;
    uint8_t            m_unIdxToEvtClient;
    EVENT_UID          m_acBindedEvent;
    instanceTypeList_t m_acParamsList;
} stParams_t;

#ifdef EXPORTING_EXTN
#define RTE_EXTN __declspec(dllexport)
#else
#define RTE_EXTN __declspec(dllimport)
#endif

class RTE_EXTN BaseA {
public:
  BaseA(){}
  virtual ~BaseA(){}
  void rxdEvent(stEvent_t pa_stEvent){ onRxdEvent(pa_stEvent);}
protected:
  virtual void onRxdEvent(stEvent_t pa_stEvent); 
};

class RTE_EXTN BaseB : public BaseA {
public:
  BaseB(stParams_t pa_stParams){;}
  virtual ~BaseB(){}
  void sendOutput(size_t dataSize);
  virtual int initialise() {return -1;}
  virtual void onRxdEvent(stEvent_t pa_stEvent) {};
  stBlock_t m_stBlock;
  stElem_t  *m_stElem;
protected:
  stEvent_t m_stEvent;
  stParams_t m_stParams;
};

class RTE_EXTN DerivedClassA : public BaseB {
public:
  DerivedClassA(stBlock_t pa_stBlock, stElem_t *pa_stElem, stParams_t pa_stParams) : BaseB(pa_stParams){
    m_stElem = pa_stElem;
    m_stBlock = pa_stBlock;
  }
  int initialise(){return 0;}
  void onRxdEvent(stEvent_t pa_stEvent);
};

extern "C" {
  RTE_EXTN BaseB* CreateDerivedObj(stBlock_t pa_stBlock, stElem_t *pa_stElem, stParams_t pa_stParams);
};

typedef BaseB* (*CreateDrvObjType_t) (stBlock_t pa_stBlock, stElem_t *pa_stElem, stParams_t pa_stParams);

我的dllmain.cpp：

#include "dllhelp.h"
BaseA* CreateDerivedObject(stBlock_t pa_stBlock, stElem_t *pa_stElem, stParams_t pa_stParams)
{       
    return new DerivedClassA(pa_stBlock, pa_stElem, pa_stParams);
}

我的主要可执行文件：

stBlock_t   m_siInfo;
stElem_t    *pa_stElem;
stParams_t  m_siParams;
//the above structures are initialized and updated with valid data..

HINSTANCE hGetProcIDDLL_derived;
typedef BaseB* (*CreateDrvObjType_t) (stBlock_t pa_stBlock, stElem_t *pa_stElem, stParams_t pa_stParams);
hGetProcIDDLL_derived = LoadLibrary(TEXT("dllhelp.dll")); 
CreateDrvObjType_t oExtension = reinterpret_cast<CreateDrvObjType_t>(GetProcAddress(hGetProcIDDLL_derived, "CreateDerivedObj"));
BaseB* paDrvObj = oExtension(m_siInfo,pa_stElem,m_siParams);

尝试调试模式时，我能够看到所有结构都填充了有效元素。但是在dllmain.cpp上进行调试时，我无法在结构上看到任何有效数据。有些指向空地址，有些指向无效数据，有些指出＆＃34;错误读取字符串＆＃34;。

注意：我在主可执行文件中不使用dllhelp.h文件。相反，我已经在主文件中声明了所有结构。