Cocos2dx Jni出现"无法解析的外部符号"错误，如何破

[编码很酷]

错误信息：

错误	2	error LNK2019: 无法解析的外部符号 "__declspec(dllimport) public: static bool __cdecl 

cocos2d::JniHelper::getStaticMethodInfo(struct cocos2d::JniMethodInfo_ &,char const *,char const *,char const *)" (__imp_?

getStaticMethodInfo@JniHelper@cocos2d@@SA_NAAUJniMethodInfo_@2@PBD11@Z)，该符号在函数 "public: void __thiscall HelloWorld::fun

(void)" (?fun@HelloWorld@@QAEXXZ) 中被引用	E:\安卓开发工作空间\cocos2d-x-2.2\projects\jni2\proj.win32\HelloWorldScene.obj	

HelloCpp

源代码：

#include "HelloWorldScene.h"
#include "JniHelper.h"

USING_NS_CC;

CCScene* HelloWorld::scene()
{
    // 'scene' is an autorelease object
    CCScene *scene = CCScene::create();
    
    // 'layer' is an autorelease object
    HelloWorld *layer = HelloWorld::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !CCLayer::init() )
    {
        return false;
    }
    
    CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
    CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();

    /////////////////////////////
    // 2. add a menu item with "X" image, which is clicked to quit the program
    //    you may modify it.

    // add a "close" icon to exit the progress. it's an autorelease object
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
                                        "CloseNormal.png",
                                        "CloseSelected.png",
                                        this,
                                        menu_selector(HelloWorld::menuCloseCallback));
    
	pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 ,
                                origin.y + pCloseItem->getContentSize().height/2));

    // create menu, it's an autorelease object
    CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
    pMenu->setPosition(CCPointZero);
    this->addChild(pMenu, 1);

    /////////////////////////////
    // 3. add your codes below...

    // add a label shows "Hello World"
    // create and initialize a label
    
    CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Arial", 24);
    
    // position the label on the center of the screen
    pLabel->setPosition(ccp(origin.x + visibleSize.width/2,
                            origin.y + visibleSize.height - pLabel->getContentSize().height));

    // add the label as a child to this layer
    this->addChild(pLabel, 1);

    // add "HelloWorld" splash screen"
    CCSprite* pSprite = CCSprite::create("HelloWorld.png");

    // position the sprite on the center of the screen
    pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

    // add the sprite as a child to this layer
    this->addChild(pSprite, 0);
    
    return true;
}


void HelloWorld::menuCloseCallback(CCObject* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
	CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
#else
    CCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
#endif
}

void HelloWorld::fun()
{
	JniMethodInfo methodInfo;
	bool isHave = JniHelper::getStaticMethodInfo(methodInfo,
		"org/cocos2dx/hellocpp/HelloCpp", "showAd", "()V") ;

	if(isHave)
	{
		methodInfo.env->CallStaticVoidMethod(methodInfo.classID,methodInfo.methodID);
	}
}

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

class HelloWorld : public cocos2d::CCLayer
{
public:
    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();  

    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::CCScene* scene();
    
    // a selector callback
    void menuCloseCallback(CCObject* pSender);
	void fun();
    
    // implement the "static node()" method manually
    CREATE_FUNC(HelloWorld);
};

#endif // __HELLOWORLD_SCENE_H__

这个问题如何破？

[编码很酷]

引用 4 楼 musicvs 的回复:

你要加上平台判断，这代码要在Android端才能使用的，VS上编译不了，类似这样：

void JavaPlatform::callVoidMethod( const char* javaClassPath, const char* methodName ) {
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) //判断当前是否为Android平台
	JniMethodInfo minfo;
	bool isHave = JniHelper::getStaticMethodInfo(minfo,javaClassPath,methodName,"()V");
#endif
}

嗯，后面我加了平台判断代码，但是移植到Android平台的时候，出现了如下问题：

"E:\\迅雷下载\\android-ndk-r9-windows-x86\\android-ndk-r9\\ndk-build.cmd" 
Android NDK: WARNING:E:\安卓开发工作空间\cocos2d-x-2.2\/cocos2dx/Android.mk:cocos2dx_static: LOCAL_LDLIBS is always ignored for static libraries    
"Compile++ thumb : cocos2dcpp_shared <= HelloWorldScene.cpp
jni/../../Classes/HelloWorldScene.cpp:3:23: fatal error: JniHelper.h: No such file or directory
compilation terminated.
make: *** [obj/local/armeabi/objs/cocos2dcpp_shared/__/__/Classes/HelloWorldScene.o] Error 1

这个要怎么破？

[笨木头]

头文件你包含了吗

[编码很酷]

引用 6 楼 musicvs 的回复:

头文件你包含了吗

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := cocos2dcpp_shared

LOCAL_MODULE_FILENAME := libcocos2dcpp

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp


LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes\
                                  E:\安卓开发工作空间\cocos2d-x-2.2\cocos2dx\platform\android\jni

LOCAL_WHOLE_STATIC_LIBRARIES += cocos2dx_static
LOCAL_WHOLE_STATIC_LIBRARIES += cocosdenshion_static
LOCAL_WHOLE_STATIC_LIBRARIES += box2d_static
LOCAL_WHOLE_STATIC_LIBRARIES += chipmunk_static
LOCAL_WHOLE_STATIC_LIBRARIES += cocos_extension_static

LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog


include $(BUILD_SHARED_LIBRARY)

$(call import-module,cocos2dx)
$(call import-module,cocos2dx/platform/third_party/android/prebuilt/libcurl)
$(call import-module,CocosDenshion/android)
$(call import-module,extensions)
$(call import-module,external/Box2D)
$(call import-module,external/chipmunk)

我加了这句话"E:\安卓开发工作空间\cocos2d-x-2.2\cocos2dx\platform\android\jni"之后，就搞定了，神伤了一下午。

[笨木头]

引用 7 楼 Huang_Cai_Yuan 的回复:

[quote=引用 6 楼 musicvs 的回复:] 头文件你包含了吗

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := cocos2dcpp_shared

LOCAL_MODULE_FILENAME := libcocos2dcpp

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp


LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes\
                                  E:\安卓开发工作空间\cocos2d-x-2.2\cocos2dx\platform\android\jni

LOCAL_WHOLE_STATIC_LIBRARIES += cocos2dx_static
LOCAL_WHOLE_STATIC_LIBRARIES += cocosdenshion_static
LOCAL_WHOLE_STATIC_LIBRARIES += box2d_static
LOCAL_WHOLE_STATIC_LIBRARIES += chipmunk_static
LOCAL_WHOLE_STATIC_LIBRARIES += cocos_extension_static

LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog


include $(BUILD_SHARED_LIBRARY)

$(call import-module,cocos2dx)
$(call import-module,cocos2dx/platform/third_party/android/prebuilt/libcurl)
$(call import-module,CocosDenshion/android)
$(call import-module,extensions)
$(call import-module,external/Box2D)
$(call import-module,external/chipmunk)

我加了这句话"E:\安卓开发工作空间\cocos2d-x-2.2\cocos2dx\platform\android\jni"之后，就搞定了，神伤了一下午。 [/quote] 这样确实也可以~恭喜

[彩阳]

使用VS编译Android的应用？

[彩阳]

你需要Android SDK tools编译Android应用。

[zxx43]

开发android还是eclipse+cdt好

[笨木头]

你要加上平台判断，这代码要在Android端才能使用的，VS上编译不了，类似这样：

void JavaPlatform::callVoidMethod( const char* javaClassPath, const char* methodName ) {
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) //判断当前是否为Android平台
	JniMethodInfo minfo;
	bool isHave = JniHelper::getStaticMethodInfo(minfo,javaClassPath,methodName,"()V");
#endif
}