该声明没有存储类或类型说明符

Question

I have a this declaration has no storage class or type specifier problem when implementing a C++ dll. Here is the code

CarPool.h code:

#pragma once
#define DllExport _extern "C" long __declspec(dllexport)

DllExport CartToPol(char* fileName, long imgWidth, long imgHeight, long bytePerPixel);
DllExport PolToCart(char* fileName, long imgWidth, long imgHeight, long bytePerPixel);

CarPool.cpp code

    // CarPool.cpp : Defines the exported functions for the DLL application.
    //

    #include "stdafx.h"
    #include "CarPool.h"

    DllExport CartToPol(char* fileName, long imgWidth, long imgHeight, long bytePerPixel)
    {
        return TRUE;
    }

DllExport PolToCart(char* fileName, long imgWidth, long imgHeight, long bytePerPixel)
{
    return TRUE;

}    

Anyone has any idea why? Thanks.

Answer 1

I found it, it was the underscore on extern.

It should be

#define DllExport extern "C" long __declspec(dllexport)

instead of

#define DllExport _extern "C" long __declspec(dllexport)

Thanks.