[問題]cannot call member function without obj

[Zichi (外表是最好的掩飾)]

請教大家關於JNI呼叫C++ function compile 錯誤
error: cannot call member function 'void android::TestClient::setItemValue(int,
int)' without object

謝謝

以下是JNI的全部程式碼 android_media_TestService.cpp

#define LOG_TAG "TestService-JNI"
#include <utils/misc.h>
#include <utils/Log.h>
#include <stdio.h>
#include <nativehelper/JNIHelp.h>
#include <android_runtime/AndroidRuntime.h>
#include "android_media_TestService.h"
#include <media/TestClient.h>

using namespace android;
static void android_media_MyManager_setItemValue(JNIEnv *env, jobject thiz,
jint item, jint value)
{
    TestClient::setItemValue(item, value); //呼叫TestClient類別的setItemValue
}

static JNINativeMethod gMethods[] = {
    {"setItemValue",  "(II)V", (void *)android_media_MyManager_setItemValue},
};

const char* const kClassPathName = "android/media/MyManager";

int register_android_media_MyManager(JNIEnv *env)
{
    return AndroidRuntime::registerNativeMethods(env,
                "android/media/MyManager", gMethods, NELEM(gMethods));
}

jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
    JNIEnv* env = NULL;
    jint result = -1;
    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
        goto bail;
    }
    assert(env != NULL);

    if (register_android_media_MyManager(env) < 0) {
        goto bail;
    }

    result = JNI_VERSION_1_4;

bail:
    return result;
}
=======================================================================
TestClient.cpp 的程式碼

#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <utils/Log.h>
#include <media/TestClient.h>

namespace android {
    sp<IBinder> binder;
    void TestClient::add100(int n){
        getTestService();
        Parcel data, reply;
        int answer;
        data.writeInt32(getpid());
        data.writeInt32(n);
        binder->transact(0, data, &reply);
        answer = reply.readInt32();
        return;
    }
    const void TestClient::getTestService(){
        sp<IServiceManager> sm = defaultServiceManager();
        binder = sm->getService(String16("Vince.TestService"));
        if (binder == 0){
            LOGW("TestService not published, waiting...");
            return;
        }
    }
    void TestClient::setItemValue(int item, int value){
        LOGE("TestClient::setItemValue item:%d, value:%d\n", item, value);
        //先試著呼叫到這邊
    }
}; //namespace

using namespace android;
int main(int argc, char** argv)
{
    TestClient* p = new TestClient();
    p->add100(1);
    return 0;
}
============================================================================
TestClient.h

namespace android {
    class TestClient {
    public:
    void add100(int n);
    void setItemValue(int item, int value);
    private:
    static const void getTestService();
    };
};

--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 59.124.185.194
→ hopesong:setItemValue不是static function 改成static 試看看
→ hopesong:http://ppt.cc/Kkqu
→ Zichi:感謝大大，但在.h加上static錯誤訊息變undefined reference
→ Zichi:to `android::TestClient::setItemValue(int, int)'
※ 編輯: Zichi           來自: 59.124.185.194       (10/25 11:34)
→ hopesong:undefined reference是c++常見問題  google很容易找答案
→ hopesong:通常是namespace或是可見範圍或名稱不match之類的