链接器错误-请帮助:错误LNK2001:无法解决的外部符号

Linker Error - please help: error LNK2001: unresolved external symbol

本文关键字：错误 解决 外部 符号 LNK2001 帮助 链接      更新时间：2023-10-16

我不确定我做错了什么，我认为一切都是准确定义一次，一切都正确链接，但我想情况并非如此…

以下是我的编译器给我的错误: 
1>StaticElements.obj : error LNK2001: unresolved external symbol "private: static int Powerup_Health::g_refCount" (?g_refCount@Powerup_Health@@0HA)
1>StaticElements.obj : error LNK2001: unresolved external symbol "private: static class DBModel * Powerup_Health::g_pModel" (?g_pModel@Powerup_Health@@0PAVDBModel@@A)
1>StaticElements.obj : error LNK2001: unresolved external symbol "private: static int Powerup_QuadDamage::g_refCount" (?g_refCount@Powerup_QuadDamage@@0HA)
1>StaticElements.obj : error LNK2001: unresolved external symbol "private: static class DBModel * Powerup_QuadDamage::g_pModel" (?g_pModel@Powerup_QuadDamage@@0PAVDBModel@@A)
代码:

StaticElements.h 

#pragma once
#include "D3DUtil.h"
class ContentManager;
class Level;
class GraphCamera;
class Powerup_Health;
class Powerup_QuadDamage;
class StaticElements
{
public:
    StaticElements(){};
    ~StaticElements(){};
    void PreLevelInitialisation(Level* pLevel);
    void PostLevelInitialisation();
private:
    Powerup_Health* m_pPwrHealth;
    Powerup_QuadDamage* m_pPwrQuadDamage;
};

StaticElements.cpp 

#include "StdAfx.h"
#include "StaticElements.h"
#include "Level.h"
#include "DBModel.h"
#include "Powerup_Health.h"
#include "Powerup_QuadDamage.h"

void StaticElements::PreLevelInitialisation(Level* pLevel)
{
//////POWERUPS
    Powerup_Health::InitModel();
    m_pPwrHealth = new Powerup_Health();
    pLevel->AddChild(m_pPwrHealth);
    Powerup_QuadDamage::InitModel();
    m_pPwrQuadDamage = new Powerup_QuadDamage();
    pLevel->AddChild(m_pPwrQuadDamage);
}

Powerup_QuadDamage.h 

#pragma once
#include "Powerup.h"
class Powerup_QuadDamage : public Powerup
{
private:
    //static
    static DBModel* g_pModel;
    static int g_refCount;
public:
    virtual ~Powerup_QuadDamage() {
        --g_refCount;
        if (g_refCount == 0) delete g_pModel;
    }
    Powerup_QuadDamage()
        :Powerup(g_pModel, 90.0f)
    {
        ++g_refCount;
    }
    static void InitModel() {
        g_refCount = 0;
        DBModelDesc desc;
        g_pModel = new DBModel(desc, nullptr);
    }
private:
    //disabled
    Powerup_QuadDamage(const Powerup_QuadDamage& b);
    Powerup_QuadDamage& operator= (const Powerup_QuadDamage& b);
};

Powerup_Health.h 

#pragma once
#include "Powerup.h"
class Powerup_Health : public Powerup
{
private:
    //static
    static DBModel* g_pModel;
    static int g_refCount;
public:
    virtual ~Powerup_Health() {
        --g_refCount;
        if (g_refCount == 0) delete g_pModel;
    }
    Powerup_Health()
        :Powerup(g_pModel, 20.0f)
    {
        ++g_refCount;
    }
    static void InitModel() {
        g_refCount = 0;
        DBModelDesc desc;
        g_pModel = new DBModel(desc, nullptr);
    }
private:
    //disabled
    Powerup_Health(const Powerup_Health& b);
    Powerup_Health& operator= (const Powerup_Health& b);
};

谁能告诉我是什么导致错误和如何修复它?谢谢。

静态成员变量必须在模块级显式初始化。在cpp文件中添加如下内容:

int Powerup_Health::g_refCount = 0;
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