linker error LNK2001: unresolved external symbol "__declspec(dllimport)

I am tring to create a dll.I get the following error while linking with 238 warnings.
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall TraceNo::TraceNo(char const *)" (__imp_??0TraceNo@@QAE@PBD@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall TraceNo::~TraceNo(void)" (__imp_??1TraceNo@@QAE@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "public: virtual class NC_OverridableFunction * __thiscall NC_OverridableFunction::Clone(void)" (?Clone@NC_OverridableFunction@@UAEPAV1@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall NC_Object::FailedRegistration(class NC_RegistrationID &,class ErrorMsg_Reg const *)" (?FailedRegistration@NC_Object@@UAEXAAVNC_RegistrationID@@PBVErrorMsg_Reg@
@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall NC_OverridableFunction::~NC_OverridableFunction(void)" (__imp_??1NC_OverridableFunction@@UAE@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class FuncName const  _STR_CONSTRUCTOR" (__imp_?_STR_CONSTRUCTOR@@3VFuncName@@B)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall NC_OverridableFunction::NC_OverridableFunction(void)" (__imp_??0NC_OverridableFunction@@QAE@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class FuncName const  _STR_DESTRUCTOR" (__imp_?_STR_DESTRUCTOR@@3VFuncName@@B)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class String & __thiscall String::operator<<(double)" (__imp_??6String@@QAEAAV0@N@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class String & __thiscall String::Clean(void)" (__imp_?Clean@String@@QAEAAV1@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall SQL::~SQL(void)" (__imp_??1SQL@@QAE@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class Error & __thiscall Error::operator<<(char const *)" (__imp_??6Error@@QAEAAV0@PBD@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: int __thiscall SQL::ReportError(void)" (__imp_?ReportError@SQL@@QAEHXZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: int __thiscall SQL::getSQLrc(void)" (__imp_?getSQLrc@SQL@@QAEHXZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall SQL::SQL(class DataBase &,class String const &)" (__imp_??0SQL@@QAE@AAVDataBase@@ABVString@@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: static class DataBase * __cdecl DataBaseManager::GetCurrentDataBase(void)" (__imp_?GetCurrentDataBase@DataBaseManager@@SAPAVDataBase@@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class String & __thiscall String::operator<<(class String const &)" (__imp_??6String@@QAEAAV0@ABV0@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class String const & __thiscall NVPHash::Get(class String const &,class String const &)const " (__imp_?Get@NVPHash@@QBEABVString@@ABV2@0@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class NameValuePairMap const & __thiscall HttpRequest::getNVPs(void)const " (__imp_?getNVPs@HttpRequest@@QBEABVNameValuePairMap@@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class StringWithOwnership const  _STR_EMPTY_" (__imp_?_STR_EMPTY_@@3VStringWithOwnership@@B)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall String::String(char const *)" (__imp_??0String@@QAE@PBD@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class StringWithOwnership const  _PARAM_NAME_MERCHANT_REF_NUM" (__imp_?_PARAM_NAME_MERCHANT_REF_NUM@@3VStringWithOwnership@@B)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall String::~String(void)" (__imp_??1String@@UAE@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class Error & __cdecl Error::nls(class ErrorMsg const *,...)" (__imp_?nls@Error@@QAAAAV1@PBVErrorMsg@@ZZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class ErrorMsg_API const  _API_CANT_FIND_IN_ENV" (__imp_?_API_CANT_FIND_IN_ENV@@3VErrorMsg_API@@B)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: char const * __thiscall String::c_str(void)const " (__imp_?c_str@String@@QBEPBDXZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class Error & __thiscall Error::operator<<(class Error & (__cdecl*)(class Error &))" (__imp_??6Error@@QAEAAV0@P6AAAV0@AAV0@@Z@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) class Error  error" (__imp_?error@@3VError@@A)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class NC_Void * __thiscall NC_Environment::Seek(class String const &)" (__imp_?Seek@NC_Environment@@QAEPAVNC_Void@@ABVString@@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "class StringWithOwnership const  _PARAM_NAME_ORDER_REF_NUM" (?_PARAM_NAME_ORDER_REF_NUM@@3VStringWithOwnership@@B)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class String & __thiscall String::operator<<(char const *)" (__imp_??6String@@QAEAAV0@PBD@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall String::String(class String const &)" (__imp_??0String@@QAE@ABV0@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall NC_OverridableFunction::NC_OverridableFunction(class NC_OverridableFunction const &)" (__imp_??0NC_OverridableFunction@@QAE@ABV0@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class NC_OverridableFunction & __thiscall NC_OverridableFunction::operator=(class NC_OverridableFunction const &)" (__imp_??4NC_OverridableFunction@@QAEAAV0@ABV0
@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall ClassName::ClassName(char const *)" (__imp_??0ClassName@@QAE@PBD@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall ClassName::~ClassName(void)" (__imp_??1ClassName@@UAE@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: int __thiscall NC_OverridableFunctionManager::RegisterOverridableFunction(class String const &,class String const &,class String const &,double,class NC_Overrida
bleFunction *)" (__imp_?RegisterOverridableFunction@NC_OverridableFunctionManager@@QAEHABVString@@00NPAVNC_OverridableFunction@@@Z)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: static class NC_OverridableFunctionManager & __cdecl NC_OverridableFunctionManager::GetUniqueInstance(void)" (__imp_?GetUniqueInstance@NC_OverridableFunctionMana
ger@@SAAAV1@XZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: void __thiscall Error::endl(void)" (__imp_?endl@Error@@QAEXXZ)
ordertot.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: void __thiscall Error::indent(void)" (__imp_?indent@Error@@QAEXXZ)
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/ordertot.exe : fatal error LNK1120: 41 unresolved externals
Error executing link.exe.

ordertot.exe - 42 error(s), 238 warning(s)
My code is as given below .I have included all the necessary headers.There seems to be some problem with _declspec.Please help.
#include "objects/objects.pch"
#include<winbase.h>



#if defined (WIN32)
 #define __DLL_NCS_API__ __declspec(dllexport)
#elif defined(AIX)
  #define __DLL_NCS_API__
#endif

#include "tasks_api.h"

//========================================================================================
//========================================================================================
//#define __TRACE_NCAPIS__

#ifdef __TRACE_NCAPIS__
  typedef TraceYes Trace;
#else
  typedef TraceNo  Trace;
#endif
static Trace trace("NC_APIS ("__FILE__")");
//========================================================================================


static const double SIGMA = 0.000001;



//////////////////////////////////////////////////////////////////////////////////////////
//
//  GetOrdProdTot
//
//
//class __declspec(dllexport) GetOrdProdTot : public NC_OverridableFunction
class __DLL_NCS_API__ GetOrdProdTot : public NC_OverridableFunction
{
   static const ClassName _STR_ThisClass;

public:
   GetOrdProdTot()
   {
      Trace::Tracer T(_STR_CONSTRUCTOR, _STR_ThisClass);
   }
   virtual ~GetOrdProdTot()
   {
      Trace::Tracer T(_STR_DESTRUCTOR, _STR_ThisClass);
   }

   void operator delete(void* p) { ::delete p; }

public:
   virtual bool Process(const HttpRequest& Req, HttpResponse& Res, NC_Environment& Env)
   {
      // Set the error handler.    
      String ErrTaskName(_TaskName);
      ErrTaskName << "_ERR";

      // Input Parameters:
      const String* OrderRefNum = (const String *) Env.Seek(_PARAM_NAME_ORDER_REF_NUM);
      if (OrderRefNum == NULL)
      {
         error << indent; error.nls(&_API_CANT_FIND_IN_ENV, _PARAM_NAME_ORDER_REF_NUM.c_str()) << endl;
         return false;
      }

      const String* MerchantRefNum = (const String *) Env.Seek(_PARAM_NAME_MERCHANT_REF_NUM);
      if (MerchantRefNum == NULL)
      {
         error << indent; error.nls(&_API_CANT_FIND_IN_ENV, _PARAM_NAME_MERCHANT_REF_NUM.c_str()) << endl;
         return false;
      }

      // Output Parameters:
 //     String *ProductPrice = (String *) Env.Seek(_PARAM_NAME_PRODUCT_PRICE);
 //     if (ProductPrice == NULL)
 //     {
 //        error << indent; error.nls(&_API_CANT_FIND_IN_ENV, _PARAM_NAME_PRODUCT_PRICE.c_str()) << endl;
 //        return false;
 //     }
      double disc=atof(Req.getNVPs().Get("myamt").c_str());
      String stmt;  
      stmt << "UPDATE orders SET orprtot=orprtot+discamt"
             << "WHERE orrfnbr=" << *OrderRefNum
             << "and ormenbr=" << *MerchantRefNum;
        SQL Sql(*(DataBaseManager::GetCurrentDataBase()), stmt);
        if (Sql.getSQLrc() != ERR_DB_NO_ERROR)
         {
            Sql.ReportError();
            error << "Update after lump" << endl;
            return false;
         }
        stmt.Clean();
        stmt << "UPDATE orders SET discamt=0"
             << "WHERE orrfnbr=" << *OrderRefNum
             << "and ormenbr=" << *MerchantRefNum;
        SQL Sql1(*(DataBaseManager::GetCurrentDataBase()), stmt);
        if (Sql1.getSQLrc() != ERR_DB_NO_ERROR)
         {
            Sql1.ReportError();
            error << "Update after lump" << endl;
            return false;
         }
       stmt.Clean();
       stmt << "UPDATE orders SET discamt="<<disc<<","
            << "SET orprtot=orprtot+" << disc;
   
      SQL Sql2(*(DataBaseManager::GetCurrentDataBase()), stmt);
      if (Sql2.getSQLrc() != ERR_DB_NO_ERROR)
         {
            Sql2.ReportError();
            error << "Update after lump" << endl;
            return false;
         }
     
        return true;      
   }
};

const ClassName GetOrdProdTot::_STR_ThisClass("GetOrdProdTot");

static bool X2 = NC_OverridableFunctionManager::GetUniqueInstance().RegisterApi
                 ( "IBM", "NC", "GetOrdProdTot", 1.0, new GetOrdProdTot );