Is that because I did not use friend to bind the class?

But I still get this error message.

1>AppDelegate.obj : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/SAFESEH' specification
1>     Creating library D:\home\MoseHas\popstartest\proj.win32\Debug.win32\popstartest.lib and object D:\home\MoseHas\popstartest\proj.win32\Debug.win32\popstartest.exp
1>GameLayer.obj : error LNK2001: unresolved external symbol "private: static class Global * Global::_instance" (?_instance@Global@@0PAV1@A)
1>D:\home\MoseHas\popstartest\proj.win32\Debug.win32\popstartest.exe : fatal error LNK1120: 1 unresolved externals

Try removing static from _instance and see if that works

Error: a nonstatic member reference must be relative to a specific object.

Try

int _instance;

Sorry I left my code in the office. I do not have the platform at home. I will test it tomorrow and report it.

ok

Without static declaration, it will go wrong with the same err message.

I have modified my code as follows.

class GlobalTest
{
public:
	
	static GlobalTest* getInstance()
	{ 
		if (!_instance) 
		{
			_instance = new int();
			log("new Global");
		}
		//return _instance;
		return nullptr;
	}

	bool getGlobalB(){ return globalB; }
	void setGlobalB(const bool b){ globalB = b; }
private:
	GlobalTest(){ _instance = 0; globalB = false; }
	static int* _instance;
	bool globalB;
};

And still it went wrong.

1>AppDelegate.obj : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/SAFESEH' specification
1>     Creating library D:\home\MoseHas\popstartest\proj.win32\Debug.win32\popstartest.lib and object D:\home\MoseHas\popstartest\proj.win32\Debug.win32\popstartest.exp
1>GameLayer.obj : error LNK2001: unresolved external symbol "private: static int * GlobalTest::_instance" (?_instance@GlobalTest@@0PAHA)
1>D:\home\MoseHas\popstartest\proj.win32\Debug.win32\popstartest.exe : fatal error LNK1120: 1 unresolved externals

What are you actually trying to achieve?

I want to create a class which stores the global boolean variables so that I can call it anywhere anytime.

Why do you need a class?

I just want to manage all the bools in a class.

Besides, he wrote his own getInstance() for use. I want to learn it as well so that I can create a class my own.

Who’s he?

This is an open source code for popstar tutorial. The auther wrote some his own classes.

Message him to see if he had any of these problems.

I have solved this problem. I found someone else’s global setting method.

/*
* Global.h
*/

#ifndef _GLOBAL_H_
#define _GLOBAL_H_

#include "cocos2d.h"

USING_NS_CC;

class Global
{

public:
	static bool resumable;
	static bool isHammered;
	static bool isDoubled;
	static bool isColored;
	static bool mainMenuBool;

};
#endif //_GLOBAL_H_

/*
* Global.cpp
*/

#include "Global.h"

bool Global::resumable = false;
bool Global::isHammered = false;
bool Global::isDoubled = false;
bool Global::isColored = false;
bool Global::mainMenuBool = true;

The declaration here I think is really weird. However, it worked successfully.

Although I solved the problem, I failed to build apk now. The error message looked like the global variables were not allowed. I am not sure.

D:\home\MoseHas\popstartest>cocos compile -p android -ap22
Running command: compile
Building mode: debug
Android platform not specified, searching a default one...
running: '"D:\cocos_workspace\Android\sdk\tools\android" update project -t andro
id-22 -p D:\home\MoseHas\popstartest\proj.android'

Updated project.properties
Updated local.properties
Updated file D:\home\MoseHas\popstartest\proj.android\proguard-project.txt
It seems that there are sub-projects. If you want to update them
please use the --subprojects parameter.
Android platform not specified, searching a default one...
running: '"D:\cocos_workspace\Android\sdk\tools\android" update lib-project -p D
:\home\MoseHas\popstartest\proj.android\../cocos2d/cocos/platform/android/java -
t android-22'

Updated project.properties
Updated local.properties
Updated file D:\home\MoseHas\popstartest\proj.android\..\cocos2d\cocos\platform\
android\java\proguard-project.txt
building native
NDK build mode: debug
NDK_TOOLCHAIN_VERSION: 4.9
running: '"D:\cocos_workspace\android-ndk-r10e\ndk-build" -C D:\home\MoseHas\pop
startest\proj.android -j8 NDK_MODULE_PATH=D:\home\MoseHas\popstartest\proj.andro
id\../cocos2d;D:\home\MoseHas\popstartest\proj.android\../cocos2d/cocos;D:\home\
MoseHas\popstartest\proj.android\../cocos2d/external NDK_TOOLCHAIN_VERSION=4.9 N
DK_DEBUG=1'

make.exe: Entering directory `D:/home/MoseHas/popstartest/proj.android'
[armeabi] Compile++ thumb: cocos2dcpp_shared <= main.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= AppDelegate.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= ComboEffect.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= FloatWord.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= GameData.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= GameLayer.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= GameScene.cpp
[armeabi] Compile++ thumb: cocos2dcpp_shared <= Global.cpp
In file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/GameScene.h:4,
                 from jni/../../Classes/GameScene.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
compilation terminated.
In file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/GameData.cpp:2:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
In file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/FloatWord.h:4,
                 from jni/../../Classes/FloatWord.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
In file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/GameLayer.h:4,
                 from jni/../../Classes/GameLayer.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
cIn file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos
/3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/AppDelegate.h:4,
                 from jni/hellocpp/main.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
In file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/Global.h:4,
                 from jni/../../Classes/Global.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
ccomIn file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/co
cos/3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/ComboEffect.h:4,
                 from jni/../../Classes/ComboEffect.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
In file included from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../base/ZipUtils.h:36:0,
                 from D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/
3d/../cocos2d.h:56,
                 from jni/../../Classes/AppDelegate.h:4,
                 from jni/../../Classes/AppDelegate.cpp:1:
D:/home/MoseHas/popstartest/proj.android/../cocos2d/cocos/3d/../platform/android
/CCFileUtils-android.h:37:35: fatal error: android/asset_manager.h: No such file
 or directory
 #include "android/asset_manager.h"
                                   ^
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os2dcpp_shared/__/__/Classes/GameScene.o] Error 1
make.exe: *** Waiting for unfinished jobs....
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/hellocpp/main.o] E
rror 1
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/__/__/Classes/AppD
elegate.o] Error 1
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/__/__/Classes/Comb
oEffect.o] Error 1
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/__/__/Classes/Floa
tWord.o] Error 1
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/__/__/Classes/Game
Data.o] Error 1
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/__/__/Classes/Game
Layer.o] Error 1
make.exe: *** [obj/local/armeabi/objs-debug/cocos2dcpp_shared/__/__/Classes/Glob
al.o] Error 1
make.exe: Leaving directory `D:/home/MoseHas/popstartest/proj.android'
Ndk build failed!

Try removing the global variable to see if it runs.