000
22.08.2005, 12:22 Uhr
DarthDevilous
|
In einer dll hab ich zwei klassen, CDataReader und CDataReaderFactory, definiert. Hier das wichtigste:
| C++: |
//DataReader.h
#pragma once
CORE_API class CDataReader
{
public:
CDataReader(void) { }
virtual ~CDataReader(void) { }
};
CORE_API class CDataReaderFactory
{
public:
CDataReaderFactory(void);
virtual ~CDataReaderFactory(void);
private:
CDataReaderFactory *pNextFactory;
static CDataReaderFactory *pFirstFactory;
};
// DataReader.cpp
#include "StdAfx.h"
#include "DataReader.h"
CDataReaderFactory* CDataReaderFactory::pFirstFactory = NULL;
CDataReaderFactory::CDataReaderFactory(void)
{
pNextFactory = pFirstFactory;
pFirstFactory = this;
}
CDataReaderFactory::~CDataReaderFactory(void)
{
if (pFirstFactory = this)
pFirstFactory = pNextFactory;
else
{
for (CDataReaderFactory *pFactory = pFirstFactory;
pFactory;
pFactory = pFactory->pNextFactory)
{
if (pFactory->pNextFactory = this)
pFactory->pNextFactory = pNextFactory;
}
}
}
|
In einer zweiten dll definiere ich zwei weitere klassen, die von diesen beiden abstammen (wieder nur das wichtigste):
| C++: |
//ObjectReader.h
#pragma once
#include <string>
#include <list>
#include "../Core/Object.h"
#include "../Core/DataReader.h"
namespace ObjectReader
{
class CObjectReader
{
public:
CObjectReader(void);
CObjectReader(size_t ulStartIndex);
virtual ~CObjectReader(void);
static char* pData;
};
class CObjectReaderHead :
public CObjectReader, public CDataReader
{
public:
CObjectReaderHead(void);
virtual ~CObjectReaderHead(void);
};
class CObjectFileReaderFactory
: public CDataReaderFactory
{
public:
CObjectFileReaderFactory(void) { }
virtual ~CObjectFileReaderFactory(void) { }
};
}
// ObjectReader.cpp
#include "StdAfx.h"
#include "ObjectReader.h"
namespace ObjectReader
{
/*
* Die Implementierung ist recht lang, also überspringe sie jetzt. U.a. ist auch definiert:
*/
char* CObjectReader::pData = NULL;
CObjectFileReaderFactory thisReader;
}
|
Beim compilieren des ersten dlls bekomme ich die verdächtigen warnungen:
| Code: |
DataReader.cpp
c:\Documents and Settings\****\My Documents\Visual Studio Projects\MetaEngine\Core\DataReader.h(13) : warning C4091: '__declspec(dllexport ) ' : ignored on left of 'CDataReader' when no variable is declared
c:\Documents and Settings\****\My Documents\Visual Studio Projects\MetaEngine\Core\DataReader.h(28) : warning C4091: '__declspec(dllexport ) ' : ignored on left of 'CDataReaderFactory' when no variable is declared
|
Beim zweiten dll bekomme ich dann den link error:
| Code: |
ObjectReader.obj : error LNK2019: unresolved external symbol "public: __thiscall CDataReaderFactory::CDataReaderFactory(void)" (??0CDataReaderFactory@@QAE@XZ) referenced in function "public: __thiscall ObjectReader::CObjectFileReaderFactory::CObjectFileReaderFactory(void)" (??0CObjectFileReaderFactory@ObjectReader@@QAE@XZ)
ObjectReader.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CDataReaderFactory::~CDataReaderFactory(void)" (??1CDataReaderFactory@@UAE@XZ) referenced in function "public: virtual __thiscall ObjectReader::CObjectFileReaderFactory::~CObjectFileReaderFactory(void)" (??1CObjectFileReaderFactory@ObjectReader@@UAE@XZ)
|
für das linken benutze ich ein #pragma comment(lib, "...") |
