[英]COMPILE_TIME_ASSERTs all fail referencing dlib as shared library
I'm trying to write a JNI wrapper for dlib so that I can obtain face descriptors in Java. 我正在尝试为dlib写一个JNI包装器,这样我就可以用Java获取面部描述符。 I've written the jni code to do it, but I can't seem to
make
it (on MacOS X). 我写的JNI代码做到这一点,但我似乎无法
make
它(在MacOS X)。 My JNI doesn't create any compile errors, but a ton of the COMPILE_TIME_ASSERTS fail when make
-ing it. 我的JNI不会产生任何编译错误,但是当一吨COMPILE_TIME_ASSERTS失败
make
-ing它。
What am I doing wrong and how can I successfully accomplish this? 我在做什么错,我该如何成功完成?
CmakeLists.txt : CmakeLists.txt :
cmake_minimum_required(VERSION 2.8.12)
project(dlib-jni)
set(CMAKE_CXX_STANDARD 11)
# add_subdirectory(../dlib dlib_build)
include_directories(src)
find_package(dlib REQUIRED) #possibly supporting components!
# include_directories(${OpenCV_INCLUDE_DIRS})
message(STATUS "Using dlib-${dlib_VERSION}")
find_package(OpenCV 3 REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
find_package(JNI REQUIRED)
message (STATUS "JNI_INCLUDE_DIRS=${JNI_INCLUDE_DIRS}")
message (STATUS "JAVA_INCLUDE_PATH =${JAVA_INCLUDE_PATH}")
message (STATUS "JNI_LIBRARIES=${JNI_LIBRARIES}")
message (STATUS "JAVA_JVM_LIBRARY=${JAVA_JVM_LIBRARY}")
include_directories(${JNI_INCLUDE_DIRS})
add_library(dlib_jni SHARED src/dlib-jni.cpp)
target_link_libraries(dlib_jni dlib::dlib opencv_core opencv_highgui)
cmake Command : cmake命令 :
cmake -DOpenCV_DIR=/usr/local/opt/opencv/share/OpenCV/OpenCVConfig.cmake ../
cmake Output : cmake输出 :
-- The C compiler identification is AppleClang 9.1.0.9020039
-- The CXX compiler identification is AppleClang 9.1.0.9020039
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Using dlib-19.15.99
-- Found OpenCV: /usr/local (found suitable version "3.3.1", minimum required is "3")
-- Found JNI: /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/libjawt.dylib
-- JNI_INCLUDE_DIRS=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/include;/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/include/darwin;/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/include
-- JAVA_INCLUDE_PATH =/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/include
-- JNI_LIBRARIES=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/libjawt.dylib;/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/server/libjvm.dylib
-- JAVA_JVM_LIBRARY=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/server/libjvm.dylib
-- Configuring done
CMake Warning (dev):
Policy CMP0042 is not set: MACOSX_RPATH is enabled by default. Run "cmake
--help-policy CMP0042" for policy details. Use the cmake_policy command to
set the policy and suppress this warning.
MACOSX_RPATH is not specified for the following targets:
dlib_jni
This warning is for project developers. Use -Wno-dev to suppress it.
-- Generating done
-- Build files have been written to: /Users/me/gitrepos/dlib-jni/build
make command : 制作命令 :
make && make install
First Error (there are many) : 第一个错误(有很多) :
/usr/local/include/dlib/array2d/../geometry/../image_processing/../image_transforms/image_pyramid.h:940:13: error: static_assert failed "Failed assertion"
COMPILE_TIME_ASSERT( pixel_traits<in_pixel_type>::has_alpha == false );
The COMPILE_TIME_ASSERT
s are there to ensure that your code that uses dlib is actually correct. 使用
COMPILE_TIME_ASSERT
可以确保使用dlib的代码实际上是正确的。
As it happens, mine wasn't. 碰巧的是,我不是。
In my case I had created a dlib cv_image from an OpenCV Mat, like so: 在我的情况下,我从OpenCV Mat创建了一个dlib cv_image,如下所示:
dlib::cv_image<rgb_pixel_apha> img(image);
And then attempted to detect faces like so: 然后尝试像这样检测人脸:
std::vector<dlib::matrix<rgb_pixel>> faces;
for (auto face : detector(img))
...
The keen-eyed developer will notice that they're templated differently. 敏锐的开发人员会注意到,它们的模板不同。 One is a
rgb_pixel_alpha
, and the other is an rgb_pixel
. 一个是
rgb_pixel_alpha
,另一个是rgb_pixel
。
The COMPILE_TIME_ASSERT checking for the alpha channel picked up on this. COMPILE_TIME_ASSERT检查在此拾取的Alpha通道。 I just didn't understand the error properly.
我只是不正确理解错误。
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