JNI中cv::FileStorage的错误

Question

我在Eclipse /NDK中编译native.cpp文件时出错。

在编译下列代码行时

FileStorage storage(nativepath, FileStorage::WRITE);
storage << "img" << mat;
storage.release();

错误是

函数D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/objs/ndksetup/native.o: In Java_com_shahrukh_AugmentedReality_CAMShiftDetection_savemat(_JNIEnv*, _jobject*, long long, _jstring*)': D:\androidworkspace\Augmented-Reality/jni/native.cpp:14: undefined reference tocv::FileStorage::FileStorage(std::string const&，int，std::string const&)‘operator<<': D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2923: undefined reference tocv::operator<<(cv::FileStorage&，函数中的D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/objs/ndksetup/native.o：：：string&)函数中的D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/objs/ndksetup/native.o：operator<< <cv::Mat>': D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2914: undefined reference to(cv：：FileStorage&，std::string &，简历：：Mat const&)‘D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/objs/ndksetup/native.o: In function Java_com_shahrukh_AugmentedReality_CAMShiftDetection_savemat(_JNIEnv*, _jobject*, long long, _jstring*)': D:\androidworkspace\Augmented-Reality/jni/native.cpp:16: undefined reference tocv：：FileStorage：：Java_com_shahrukh_AugmentedReality_CAMShiftDetection_savemat(_JNIEnv*, _jobject*, long long, _jstring*)': D:\androidworkspace\Augmented-Reality/jni/native.cpp:16: undefined reference to()’D:\androidworkspace\Augmented-Reality/jni/native.cpp:18:未定义的对cv::FileStorage::~FileStorage()' D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/objs/ndksetup/native.o: In functionoperator<<的引用'：D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2913:对cv::Exception::Exception(int, std::string const&, std::string const&, std::string const&, int)' D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2913: undefined reference tocv的未定义引用：：error(cv：：cv::Exception::Exception(int, std::string const&, std::string const&, std::string const&, int)' D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2913: undefined reference to const&)‘cv::Exception::~Exception()' D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2913: undefined reference to未定义引用：：cv::Exception::Exception(int, std::string const&, std::string const&, std::string const&, int)' D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2913: undefined reference to：：~cv::Exception::Exception(int, std::string const&, std::string const&, std::string const&, int)' D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/include/opencv2/core/operations.hpp:2913: undefined reference to()’D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/objs/ndksetup/native.o：函数Java_com_shahrukh_AugmentedReality_CAMShiftDetection_savemat(_JNIEnv*, _jobject*, long long, _jstring*)': D:\androidworkspace\Augmented-Reality/jni/native.cpp:18: undefined reference tocv::FileStorage::~FileStorage()‘收藏品2.exe:错误: ld返回一个退出状态make.exe：* D:/androidworkspace/Augmented-Reality//obj/local/arm64-v8a/libndksetup.so错误1

这是我的native.cpp文件

#include <jni.h>
#include <stdio.h>
#include <string.h>
#include <android/log.h>
#include <opencv2/core/core.hpp>

using namespace cv;

JNIEXPORT void Java_com_shahrukh_AugmentedReality_CAMShiftDetection_savemat(JNIEnv *env, jobject obj,jlong addrmat, jstring path)
{
    const char *nativepath = env->GetStringUTFChars(path, 0);
    Mat& mat = *(Mat*)addrmat;

    FileStorage storage(nativepath, FileStorage::WRITE);
    storage << "img" << mat;
    storage.release();

    env->ReleaseStringUTFChars(path, nativepath);
}

这是我的Android.mk文件

LOCAL_PATH := $(call my-dir)

export OPENCV_PACKAGE_DIR = D:/android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni

include $(CLEAR_VARS)
OPENCV_CAMERA_MODULES:=off
include $(OPENCV_PACKAGE_DIR)/OpenCV.mk

LOCAL_LDLIBS := -llog -ldl

LOCAL_MODULE    := ndksetup
LOCAL_SRC_FILES := native.cpp

include $(BUILD_SHARED_LIBRARY)  

这是我的Application.mk

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := all

Answer 1

经过大量的调试，我发现这个错误很小。

错误在行中

LOCAL_LDLIBS := -llog -ldl

这条线应该是

LOCAL_LDLIBS += -llog -ldl