关于类和错误的帮助：C3861 [英] Help about class and error: C3861

问题描述

有人可以帮助我处理这个错误吗？

Can someone help me in this error?

在cDef.h中：

#pragma once

class cDef 
{
public:

    static int STATE_LOGO;
    static int STATE_MENU;

    static int MESSAGE_ENTER;
    static int MESSAGE_UPDATE;
    static int MESSAGE_PAINT;
    static int MESSAGE_EXIT;
};

：

#pragma once
#ifndef _GameState_
#define _GameState_
#include "cDef.h"

class MainGame;
class GameState;


class GameState
{
public:

    MainGame *mg;
    int GAME_STATE_DEF;

    virtual void MessengeEnter(int message) = 0;
    virtual void MessengeUpdate(int message,int keys) = 0;
    virtual void MessengePaint(int message,CDC *pDc) = 0;

void StateHandler(int message,CDC *pDc,int keys);

public:
    GameState(void);
public:
    ~GameState(void);
};
#endif

：

#include "StdAfx.h"
#include "GameState.h"

GameState::GameState(void)
{
    GAME_STATE_DEF = -1;
}

GameState::~GameState(void)
{
}

void GameState::StateHandler(int message,CDC *pDc,int keys)
{
    if(message == cDef.MESSAGE_ENTER)
    {
        MessageEnter(message);
    }

    if(message == cDef.MESSAGE_UPDATE)
    {
        MessageUpdate(message,keys);
    }

    if(message == cDef.MESSAGE_PAINT)
    {
        MessagePaint(message,pDC);
    }
}

错误：

warning C4832: token '.' is illegal after UDT 'cDef'
see declaration of 'cDef'
error C3861: 'MessageUpdate': identifier not found
error C3861: 'MessageEnter': identifier not found
error C3861: 'MessagePaint': identifier not found
...

提前感谢！

推荐答案

敲入我的学生谁必须学习C ++来自Java，总是困惑，什么时候使用 :: ，。和 - > ：

Here's what I used to hammer into my students who had to learn C++ coming from Java and always were confused about when to use ::, ., and ->:

• ：B 表示 A 是类或命名空间名称。


• AB 表示 A 是对象或对象的引用。


• A-> B 表示 A operator-> 重载（又称为智能指针）类型的对象

• A::B means A is either a class or a namespace name.
• A.B means A is either an object or a reference to an object.
• A->B means A is either a pointer or an object of a type that has operator-> overloaded (a.k.a. "smart pointer")

如果你知道这些，你也可以反向应用它们，如果你有一个 A 和 B ，你知道把什么放在之间。

If you know these, you can also apply them backwards, so that if you have an A and a B, you know what to put in between.

（我认为这些规则必须扩展为C ++ 11，但我不确定，如果你知道，请随意添加。）

(I think these rules would have to be extended for C++11, but I'm not sure. If you know, feel free to add this.)

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