OpenCV Android 实现，CMAKE 未定义引用 'cv：：fastFree(void*) 错误

Question

我正在尝试用Android中的cmake实现OpenCv310。我一起使用dlib库和openCV库。示例项目github链接

在此github链接中，其在Android NDK上的DLIB库中调用OpenCV方法。我正在尝试使用CMAKE实施该项目。我尝试从一个简单的本机lib.cpp文件调用openCV。及其工作。但是，当我添加dlib时，它开始会产生错误。

Error:(571) undefined reference to 'cv::fastFree(void*)'
Error:(682) undefined reference to 'cv::Mat::deallocate()'

这是我的cmake文件。

cmake_minimum_required(VERSION 3.4.1)

set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
set(pathToProject C:/Users/lenovo/AndroidStudioProjects/AdviserOpenCV3)
set(pathToOpenCV C:/Users/lenovo/Desktop/openCV310/OpenCV-3.1.0-android-sdk/OpenCV-android-sdk)
set(JNI_DETECTION_INCLUDE src/main/jni/jni_detections)
set(JNI_DETECTION_SRC src/main/jni/jni_detections)
set(JNI_COMMON_INCLUDE src/main/jni)
set(JNI_COMMON_SRC src/main/jni/jni_common)
set(DLIB_DIR src/main/dlib)
set(EXT_DIR src/main/third_party)
include_directories(${pathToOpenCV}/sdk/native/jni/include)
#include_directories(${DLIB_DIR}  ${JNI_COMMON_INCLUDE} ${JNI_DETECTION_INCLUDE} include)
add_library( lib_opencv SHARED IMPORTED)
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION
                      ${pathToProject}/app/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)
add_library(android_dlib SHARED
            ${JNI_DETECTION_SRC}/jni_face_det.cpp
            ${JNI_DETECTION_SRC}/jni_imageutils.cpp
            ${JNI_DETECTION_SRC}/jni_pedestrian_det.cpp
            ${JNI_COMMON_SRC}/jni_bitmap2mat.cpp
            ${JNI_COMMON_SRC}/jni_fileutils.cpp
            ${JNI_COMMON_SRC}/jni_utils.cpp
            ${JNI_COMMON_SRC}/rgb2yuv.cpp
            ${JNI_COMMON_SRC}/yuv2rgb.cpp
            ${DLIB_DIR}/threads/threads_kernel_shared.cpp
            ${DLIB_DIR}/entropy_decoder/entropy_decoder_kernel_2.cpp
            ${DLIB_DIR}/base64/base64_kernel_1.cpp
            ${DLIB_DIR}/threads/threads_kernel_1.cpp
            ${DLIB_DIR}/threads/threads_kernel_2.cpp
            ${EXT_DIR}/glog/logging.cc)

add_library( # Sets the name of the library.
             native-lib
             # Sets the library as a shared library.
             SHARED
             # Provides a relative path to your source file(s).
             src/main/cpp/native-lib.cpp )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
              log-lib
              # Specifies the name of the NDK library that
              # you want CMake to locate.
              log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
                   android_dlib
                   lib_opencv
                   # Links the target library to the log library
                   # included in the NDK.
                   ${log-lib} )

我该如何解决这个问题？感谢你的贡献。最好的问候，

Answer 1

您应该在本机lib 和 lib_opencv 之间声明依赖关系。您可能想要 Android_dlib ：

target_link_libraries(
    native-lib
    android_dlib
    lib_opencv
   # Links the target library to the log library
   # included in the NDK.
    log )

如上所述，您不需要 $ {log-lib} 在脚本中；Android NDK定义 log 为您提供库。