i download opencv 3.1.0 and build it with cmake i unchecked BUILD_SHARED_LIBS
after building finish i try to compile an c++ code as static lib and this is my
CMakeListed.txt file
cmake_minimum_required(VERSION 2.8)
PROJECT(word)
set(OpenCV_DIR "/home/medozeus/videos/opencv/share/opencv")
FIND_PACKAGE( OpenCV REQUIRED )
INCLUDE_DIRECTORIES( ${OpenCV_INCLUDE_DIRS} )
ADD_EXECUTABLE(wordx main.cpp)
TARGET_LINK_LIBRARIES (wordx ${OpenCV_LIBS})
its compiled without error and i run the program also without error but when i send the program to another pc and run it its give me
error while loading shared libraries: libjpeg.so.8: cannot open shared object file: No such file or directory
this is my 3rdparty folder content after build
and the lib inside 3rdparty content
but the source code have all the library i don't know why when i build it only build one library in 3rdparty mabye this cause the error
error while loading shared libraries: libjpeg.so.8: cannot open shared object file: No such file or directory
this is my 3rdparty folder content in source code of open cv
any idea
The error means there is no libjpeg.so.8 file on target machine you are running your executable. You could try installing it:
sudo apt-get install libjpeg-dev
Related
Hello I am trying to use a package that requires the aruco library
I downloaded the lib extracted and executed $ cmake $ make $ sudo make install
No error so far but when I try to do catkin_make on my ros workspace the following error occurs
terminal output
I am new to ROS and generaly cmake files but I think the problem is that the lib has no include directory and both cpp and .h are on the src folder.
Is there a way to fix this?
this is my cmake file for this package
cmake_minimum_required(VERSION 2.8.3)
project(aruco_mapping)
find_package(OpenCV REQUIRED)
find_package(aruco REQUIRED)
find_package(catkin REQUIRED COMPONENTS
roscpp
message_generation
image_transport
cv_bridge
tf
aruco
visualization_msgs
camera_calibration_parsers)
include_directories(${catkin_INCLUDE_DIRS} }
${PROJECT_SOURCE_DIR}/include/)
include_directories(${PROJECT_SOURCE_DIR}/src/)
SET(SOURCES ${PROJECT_SOURCE_DIR}/src/main.cpp
${PROJECT_SOURCE_DIR}/src/aruco_mapping.cpp)
SET(HEADERS ${PROJECT_SOURCE_DIR}/include/aruco_mapping.h)
add_message_files(FILES ArucoMarker.msg)
generate_messages(DEPENDENCIES
std_msgs
geometry_msgs)
catkin_package(
INCLUDE_DIRS include
LIBRARIES
)
add_executable(${PROJECT_NAME} ${SOURCES} ${HEADERS})
add_dependencies(${PROJECT_NAME} ${catkin_EXPORTED_TARGETS} aruco_mapping_gencpp )
target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS} ${aruco_LIBS} ${ROS_LIBRARIES} ${catkin_LIBRARIES})
Can you please help me connect them
While trying to figure it out I realized that the path it was searching for did not exist because I had changed the location of the file through the GUI so it was looking at the wrong path. I just kept the code files and rebuilded the project in a different file and deleted the the previous project, it worked perfectly.
So I would suggest to simply copy the code files and rebuilt the project it only takes a minute. At least this worked for me
I am developing a C++ library, including OpenCV, which will be used in a cross-platform Xamarin solution through a wrapper and the NuGet packaging system (see this guide). I configured a CMakeLists.txt file but I simply cannot get OpenCV to be correctly linked for both static (iOS) and dynamic (Android) libraries.
I tried to change the OpenCV_DIR variable, install and build OpenCV from sources and manually include the content of the OpenCV_INCLUDE_DIRS variable but nothing worked. I also noticed that the linking works when only using cv::Point. But the linking does not work when using cv::Mat, which I do not understand the reason.
The following is the CMakeLists.txt that I am using :
cmake_minimum_required (VERSION 3.2)
project (MyLib C CXX)
enable_testing()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
MESSAGE(STATUS "CMAKE_CXX_FLAGS: " ${CMAKE_CXX_FLAGS})
# Source and headers files
set(SOURCES File1.cpp File2.cpp)
set(HEADERS File1.h File2.h)
# Library
if(BUILD_SHARED_LIBS)
add_library (MyLib SHARED ${SOURCES} ${HEADERS})
target_compile_definitions(MyLib PUBLIC IS_BUILDING_SHARED)
else()
add_library (MyLib STATIC ${SOURCES} ${HEADERS})
endif()
# Dependencies
set(OpenCV_DIR /usr/local/Cellar/opencv/4.5.0_1/lib/cmake/opencv4)
find_package(OpenCV REQUIRED)
message(STATUS "OpenCV_INCLUDE_DIRS = ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")
message(STATUS "OpenCV_DIR = ${OpenCV_DIR}")
include_directories(${OpenCV_INCLUDE_DIRS})
target_link_libraries(MyLib ${OpenCV_LIBS})
The following shows the location of OpenCV's files that are used during the build process. Everything seems alright.
-- OpenCV_INCLUDE_DIRS = /usr/local/Cellar/opencv/4.5.0_1/include/opencv4
-- OpenCV_LIBS = opencv_calib3d;opencv_core;opencv_dnn;opencv_features2d;opencv_flann;opencv_gapi;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_stitching;opencv_video;opencv_videoio;opencv_alphamat;opencv_aruco;opencv_bgsegm;opencv_bioinspired;opencv_ccalib;opencv_datasets;opencv_dnn_objdetect;opencv_dnn_superres;opencv_dpm;opencv_face;opencv_freetype;opencv_fuzzy;opencv_hfs;opencv_img_hash;opencv_intensity_transform;opencv_line_descriptor;opencv_mcc;opencv_optflow;opencv_phase_unwrapping;opencv_plot;opencv_quality;opencv_rapid;opencv_reg;opencv_rgbd;opencv_saliency;opencv_sfm;opencv_shape;opencv_stereo;opencv_structured_light;opencv_superres;opencv_surface_matching;opencv_text;opencv_tracking;opencv_videostab;opencv_viz;opencv_xfeatures2d;opencv_ximgproc;opencv_xobjdetect;opencv_xphoto
-- OpenCV_DIR = /usr/local/Cellar/opencv/4.5.0_1/lib/cmake/opencv4
Android
The following is the commands that I am using to build the Android dynamic library (.so). I have installed the NDK and am building for each ABI (x86, x86_64, armeabi-v7a, arm64-v8a).
cmake ../.. -DCMAKE_TOOLCHAIN_FILE=/Users/$USER/Library/Android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake -DANDROID_NATIVE_API_LEVEL=21 -DANDROID_ABI=$abi_name -DBUILD_SHARED_LIBS=ON
cmake --build . --config Release
I directly get an error when building the library which is the following.
ld: error: /usr/local/Cellar/opencv/4.5.0_1/lib/libopencv_gapi.4.5.0.dylib: unknown file type
ld: error: /usr/local/Cellar/opencv/4.5.0_1/lib/libopencv_stitching.4.5.0.dylib: unknown file type
[...]
ld: error: /usr/local/Cellar/opencv/4.5.0_1/lib/libopencv_rapid.4.5.0.dylib: unknown file type
ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
iOS
The following is the commands that I am using to build the iOS static library (.a). I am using leetal's ​cmake toolchain file from this repository.
cmake ../.. -G Xcode -DCMAKE_TOOLCHAIN_FILE=../../ios.toolchain.cmake -DPLATFORM=OS64COMBINED -DBUILD_SHARED_LIBS=OFF
cmake --build . --config Release
The compilation of the static library seems to work because no error message is printed. However, when the library is used in the final Xamarin solution, the linked library cannot be found and the following error is shown.
Native linking failed, undefined symbol: cv::Mat::deallocate(). Please verify that all the necessary frameworks have been referenced and native libraries are properly linked in. (MT5210)
Question
What am I missing in order to properly compile and link OpenCV into my C++ library ?
I am working on macOS Big Sur and uses the following tools versions:
cmake : 3.20.0-rc5
ndk : 23.0.7196353
apple clang : 12.0.0
I hope that the description of my problem is clear enough and I thank you in advance for any help.
We had same problems, including Xamarin's DllNotFoundException with message from last comment, which led me to this topic. What fixed the exception for us in the end was linking statically to OpenCV *.a libs instead of linking to the shared libopencv_java4.so file. So we now have a huge 30MB nativelib.so file for each android ABI in build output, instead of a pair of small nativelib.so and libopencv_java4.so per ABI. CMakeLists looks like this:
set( OpenCV_DIR "~/opencv/build/OpenCV-android-sdk/sdk/native/jni" )
find_package( OpenCV REQUIRED )
target_link_libraries( # Specifies the target library.
nativelib
${OpenCV_LIBS})
Another thing in our project is we use OpenCV optional modules and had to create a custom OpenCV build, which I guess ensures our native library and OpenCV are compiled against same NDK version. I suppose using the prebuilt OpenCV distribution and compiling against a different NDK version could lead to problems too otherwise.
So I'm using CMake to build a C++ project (on Mac OS) and my project relies on a dylib (I'm using TBB https://www.threadingbuildingblocks.org/ but the specific library itself doesn't matter)
If I do a standard "cmake" and "make" it builds the executable where I want it and when I run my app, the dylib links correctly and everything works perfectly.
The problem comes in when I try to do a "make install" and try to run the resulting executable from the install directory. I get an "image not found" error:
dyld: Library not loaded: #rpath/libtbb.dylib
Referenced from:
/Users/MyName/Desktop/ProjectRoot/install/./MyApp
Reason: image not found
Interestingly, if I do a regular "make" without an install, and then manually copy over the executable to the install directory, then that will link against my dylib properly. I have no idea why that is.
My directory structure is as follows:
Root
CMakeLists.txt
Source/
Libraries/
tbb/
include/
lib/
libtbb.dylib
install/
...and my CMakeLists.txt file is below:
# Start of CMakeLists.txt
cmake_minimum_required(VERSION 3.3)
project (MyApp)
# Set C++ version and output paths
set (CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR})
set(CMAKE_MACOSX_RPATH 1)
set(CMAKE_INSTALL_PREFIX "${CMAKE_SOURCE_DIR}/install")
set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
# Find TBB
find_library (
TBB_LIBRARIES
NAMES tbb libtbb # what to look for
HINTS "${CMAKE_SOURCE_DIR}/Libraries/tbb/lib" # where to look
NO_DEFAULT_PATH # do not search system default paths
)
# Set Custom Include Files + TBB header files
include_directories(Source/Headers Libraries/tbb/include)
# Set Source Files
file(GLOB_RECURSE SRC_FILES "Source/*.cpp")
add_executable(MyApp ${SRC_FILES})
# Link Libraries
target_link_libraries(MyApp ${TBB_LIBRARIES})
# Set compile flags
set_target_properties(MyApp PROPERTIES CXX_STANDARD 14) #LINK_FLAGS "-Wl")
target_compile_features(MyApp PUBLIC cxx_std_14)
# Install executable
install(TARGETS MyApp DESTINATION .)
If I try to also add the following line, and install the dylib as well:
install(TARGETS ${TBB_LIBRARIES} DESTINATION lib)
then when I do a "make install" I get the following error instead:
install TARGETS given target
"/Users/MyName/Desktop/ProjectRoot/Libraries/tbb/lib/libtbb.dylib"
which does not exist in this directory.
So I just can't seem to get this install to work. How do I fix it so that both my executable and my library get installed in the right place and that my executable will be able to link against my library when run?
I am trying to use cmake to build my project. I want to link against libpng which is present in my system. This is my code:
cmake_minimum_required(VERSION 2.8.11)
project(main)
file(GLOB SOURCES *.c)
add_executable(sphstego ${SOURCES})
find_package(PNG REQUIRED)
include_directories(${PNG_INCLUDE_DIRS} ${ZLIB_INCLUDE_DIRS})
target_link_libraries(main ${PNG_LIBRARY})
message(STATUS "PNG_LIBRARY: " ${PNG_LIBRARY}) # correct path to so file
My problem is that I want to link statically rather than dynamically. Furthermore, and although the variable set as PNG_LIBRARY is correctly set to /usr/local/lib/libpng.so, I get an error message when running my executable:
error while loading shared libraries: libpng16.so.16: cannot open shared object file: No such file or directory
Any suggestions on how to resolve this?
On Ubuntu, I have two directories: build and src. In src, my CMakeLists.txt file has the lines:
add_executable(Test main.cpp)
target_link_libraries(Test libCamera.so)
After running cmake in the build directory (cmake ../src), I then copy my library file libCamera.so into the build directory. After running make, the main.cpp.o file compiles successfully, but I receive the following error during linking:
/usr/bin/ld: cannot find -lCamera
Why is this? The shared library is in the same directory that I am building in... and the same thing happens if I copy the library to /usr/bin...
You should not put prefix lib and suffix .so of the library, so just use:
target_link_libraries(Test Camera)
if your library not found you may need to add directory, where library is located:
link_directories( /home/user/blah ) # for specific path
link_directories( ${CMAKE_CURRENT_BINARY_DIR} ) # if you put library where binary is generated
Note: you copied lib to /usr/bin but unlike Windows where dll files stored with executables, in Linux that is not the case, so it would be /usr/lib, not /usr/bin. Also you may change LD_LIBRARY_PATH variable to make your program to find a library in a custom location.