OpenCV Android C++ imwrite not found

OpenCV Android C++ imwrite not found

本文关键字：not found imwrite C++ Android OpenCV      更新时间：2023-10-16

我在我的android应用中使用OpenCV C++

我的代码正在构建并运行良好，直到我添加这一行CCD_ 1。

注意：cv:imread正在使用

错误为：error: undefined reference to 'cv::imwrite(cv::String const&, cv::_InputArray const&, std::__ndk1::vector<int, std::__ndk1::allocator<int> > const&)

OpenCV 3.4.10，Ndk 21

我错过了什么？感谢

编辑

我使用的是Android.mk文件：

# ./android/app/src/main/jni/Android.mk
# Set up paths
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Specify module name for System.loadLibrary() call
LOCAL_MODULE := helloworld
LOCAL_MODULE_SUFFIX := .so
LOCAL_MODULE_CLASS := SHARED_LIBRARIES
# Debug mode
NDK_DEBUG=1
# Specify C++ flags
LOCAL_CPPFLAGS := -std=c++17
LOCAL_CPPFLAGS += -fexceptions
LOCAL_CPPFLAGS += -frtti
LOCAL_CPPFLAGS += -Wall
LOCAL_CPPFLAGS += -Wextra
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../djinni/jni
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../djinni/cpp
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/jni
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../src/cpp
# Specify source files
LOCAL_SRC_FILES += $(LOCAL_PATH)/../../../../../djinni/jni/NativeHelloWorld.cpp
LOCAL_SRC_FILES += $(wildcard $(LOCAL_PATH)/../../../../../src/cpp/*.cpp)
LOCAL_SRC_FILES += $(wildcard $(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/jni/*.cpp)
LOCAL_SRC_FILES += $(wildcard $(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/*.cpp)
# load opencv
OPENCVROOT:= /Users/Gasp/Library/OpenCV/OpenCV-android-sdk
OPENCV_CAMERA_MODULES:=off
OPENCV_INSTALL_MODULES:=on
OPENCV_LIB_TYPE:=SHARED
OPENCV_INSTALL_MODULES:=on
# LOCAL_STATIC_LIBRARIES += libopencv_contrib libopencv_legacy libopencv_ml libopencv_stitching libopencv_nonfree libopencv_objdetect libopencv_videostab libopencv_calib3d libopencv_photo libopencv_video libopencv_features2d libopencv_highgui libopencv_androidcamera libopencv_flann libopencv_imgproc libopencv_ts libopencv_core
include ${OPENCVROOT}/sdk/native/jni/OpenCV.mk

LOCAL_MODULE := helloworld
# Specify C++ flags
LOCAL_CPPFLAGS := -lopencv_imgcodecs
LOCAL_CPPFLAGS := -std=c++17
LOCAL_CPPFLAGS += -fexceptions
LOCAL_CPPFLAGS += -frtti
LOCAL_CPPFLAGS += -Wall
LOCAL_CPPFLAGS += -Wextra
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../djinni/jni
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../djinni/cpp
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/jni
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../src/cpp

# Specify source files
LOCAL_SRC_FILES += $(LOCAL_PATH)/../../../../../djinni/jni/NativeHelloWorld.cpp
LOCAL_SRC_FILES += $(wildcard $(LOCAL_PATH)/../../../../../src/cpp/*.cpp)
LOCAL_SRC_FILES += $(wildcard $(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/jni/*.cpp)
LOCAL_SRC_FILES += $(wildcard $(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/*.cpp)

# Telling make to build the library
include $(BUILD_SHARED_LIBRARY)

我假设您使用CMake来构建OpenCV库。根据这个问题：未定义的引用'；cv:：imwrite使用Android NDK，需要添加编译器标志才能使此功能可用：-lopencv_imgcodecs。

在你的Android.mk文件中，只需确保它被附加到你的LOCAL_CPPFLAGS变量：

# Specify C++ flags
LOCAL_CPPFLAGS := -std=c++17
LOCAL_CPPFLAGS += -lopencv_imgcodecs  # Note - change is here
LOCAL_CPPFLAGS += -fexceptions
LOCAL_CPPFLAGS += -frtti
LOCAL_CPPFLAGS += -Wall
LOCAL_CPPFLAGS += -Wextra
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../djinni/jni
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../djinni/cpp
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib/jni
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../node_modules/djinni/support-lib
LOCAL_CPPFLAGS += -I$(LOCAL_PATH)/../../../../../src/cpp

一旦您进行了此更改，请重新配置项目，然后再次尝试构建源代码。在尝试重新配置项目之前，请确保清除生成目录中的缓存，否则上面所做的更改将不会生效。

其他尝试：

我试着切换到OpenCV安卓4.3.0。

在生成期间，没有更多关于未定义引用的错误。

运行时悬停行：

frame = cv::imread(trim_uri_protocal(uri), cv::IMREAD_COLOR);

(它同时适用于OpenCV android 3.4.10和iOS上的OpenCV(

导致此错误E/libc++abi: terminating with uncaught exception of type std::bad_cast: std::bad_cast

也许是个解决这个问题的主意？

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