c++ 中的链接错误& DirectX 文件包含问题
我有两个头文件：
DirectX_Engine.h
#pragma once
#include "Main.h"
#include <d3d9.h>
和：
Main.h
#pragma once
#include <Windows.h>
#include "DirectX_Engine.h"
int imRunning = 1;
编译后，我收到以下链接器错误：
error LNK1169: one or more multiply defined symbols found
error LNK2005: "int imRunning" (?imRunning@@3HA) already defined in DirectX_Engine.obj
我还收到“文件未找到或#include“d3dx9.h”时出现目录不存在错误。有什么想法吗？
I have two header files:
DirectX_Engine.h
#pragma once
#include "Main.h"
#include <d3d9.h>
and:
Main.h
#pragma once
#include <Windows.h>
#include "DirectX_Engine.h"
int imRunning = 1;
After compiling, I get the following linker errors:
error LNK1169: one or more multiply defined symbols found
error LNK2005: "int imRunning" (?imRunning@@3HA) already defined in DirectX_Engine.obj
I'm also getting a 'file is not found or directory doesn't exist error' when #includeing "d3dx9.h". Any idea?
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两个想法。首先，将
DirectX_Engine.h包含在Main.h中，并将Main.h包含在DirectX_Engine.h中。这显然行不通。其次，
int imRunning被包含到每个包含Main.h的 .cpp 文件中，并且编译器将其视为定义。然后链接器看到每个文件中定义的imRunning并且不知道该怎么做。解决方案是使用 extern：在
Main.h中：在其中一个 .cpp 文件中：
Two ideas. Firstly, you are including
DirectX_Engine.hinMain.handMain.hinDirectX_Engine.h. This will obviously not work.Secondly,
int imRunninggets included to each .cpp file that includesMain.hand the compiler treats it as a definition. Then the linker comes and seesimRunningdefined in each of these files and doesn't know what to do. The solution is using extern:In
Main.h:In one of the .cpp files:
d3dx9.h 不附带 VS 或 Platform SDK。您需要返回 MSDN 下载并获取 DirectX SDK。
d3dx9.h doesn't come with VS or Platform SDK. You'll need to go back to MSDN downloads and get DirectX SDK.