CMapStringToString在查找不同类中的键时崩溃

Question

我在Project（exe）的A类中创建一个CMapStringToString。我在A类中填充了这个地图，但是我需要将这个地图发送到不同Project（dll）中的B类。碰巧的是，每当我尝试查找密钥时，我都会遇到异常。

然而，当我尝试在同一个A级中查找密钥时，它的工作正常。

//This class is in exe project.
void A::AMethod
{
  CMapStringToString my_map;              //This map is a member variable.
  my_map.SetAt(_T("Key"), _T("value"));
  B obj;                                  //This class is in a DLL            
  obj.BsMethod(&my_map);                  //This will crash later in class B. 
                                          //And apparently I cannot pass by value
                                          //(which is bad but yeah).
---------------------------------------------------------------------------
  CString sKey, sValue;
  sKey.Format(_T("key"), sValue);
  CMapStringToString* pTempCheckMap;
  pTempCheckMap = &my_map;
  pTempCheckMap->LookUp(sKey, sValue); //This works fine and I get the value.
----------------------------------------------------------------------------
 };


 //This class is in different project, a DLL and the method is exported.
 void B::BMethod(CMapStringToString* myPopulatedMap)
 {
  if(NULL != myPopulatedMap)              //Map has valid reference and is populated.
  {
   CString sKey, sVal;
   sTemp.Format(_T("key"));
   myPopulatedMap->LookUp((LPCTSTR)sKey, sVal);  //Crashes here.
  }
}

我尝试进一步调试LookUp，在GetAssocAt方法中Map_ss.cpp发生了崩溃。以下是摘录。

CMapStringToString::CAssoc*
CMapStringToString::GetAssocAt(LPCTSTR key, UINT& nHash) const
// find association (or return NULL) 
{
  nHash = HashKey(key) % m_nHashTableSize;

  if (m_pHashTable == NULL)
        return NULL;

  // see if it exists
  CAssoc* pAssoc;
  for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext)
  {
        if (pAssoc->key == key)
              return pAssoc;
  }
  return NULL;
}

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