WARNING ** io features related to openni2 pcap png will be disabled

小咪咪 2021-11-29 15:08 295阅读 0赞

# 0. 写在最前面 #

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# 1. 问题描述 #

使用PCL编译某个ROS工程时出现这个waring：

** WARNING ** io features related to openni2 will be disabled
    ** WARNING ** io features related to pcap will be disabled
    ** WARNING ** io features related to png will be disabled
    ** WARNING ** visualization features related to openni2 will be disabled

这里其实是3个东西缺了

# 2. 解决办法 #

## 2.1 OpenNI2问题 ##

找到对应log文件后发现是OpenNI没有

Could NOT find OpenNI2 (missing:  OPENNI2_LIBRARY OPENNI2_INCLUDE_DIRS)

所以就安装OpenNI就好：

sudo apt-get install openni2-utils

## 2.2 png问题 ##

png的问题是由于pcl的cmake文件缺了相关的查找。我装ROS的时候已经默认装了libpng，如果你增加了下面这两句还是有问题，可以考虑装一个这个，但千万要小心，我更新了libpng之后不小心把ROS的东西删了，又得重装一下。

在`/usr/lib/x86_64-linux-gnu/cmake/pcl`目录下找到`PCLConfig.cmake`文件，用`sudo gedit PCLConfig.cmake`，在466行后面（`find_openni2()`下面）增加这句话：

elseif("${_lib}" STREQUAL "png")
        find_package(PNG)

## 2.3 pcap问题 ##

理由同上，不过libpcap这个是网络抓取包，一般系统不会帮忙装，需要自己装：

sudo apt-get install libpcap-dev

装完之后在`PCLConfig.cmake`中添加下面这两句：

elseif("${_lib}" STREQUAL "pcap")
        find_package(PCAP)

这个时候还不行，貌似是因为libpcap在安装的时候不会自己配置cmake。。。。。需要你到cmake的Modules目录下，我的是`/usr/share/cmake-3.5/Modules`，每个人不一样，里面会有很多的`Findxxx.cmake`的文件。你需要新建一个`FindPCAP.cmake`，然后往里面填入以下的内容（这部分来源于[这位老哥的github][github]）

# - Try to find libpcap include dirs and libraries
    #
    # Usage of this module as follows:
    #
    #     find_package(PCAP)
    #
    # Variables used by this module, they can change the default behaviour and need
    # to be set before calling find_package:
    #
    #  PCAP_ROOT_DIR             Set this variable to the root installation of
    #                            libpcap if the module has problems finding the
    #                            proper installation path.
    #
    # Variables defined by this module:
    #
    #  PCAP_FOUND                System has libpcap, include and library dirs found
    #  PCAP_INCLUDE_DIR          The libpcap include directories.
    #  PCAP_LIBRARY              The libpcap library (possibly includes a thread
    #                            library e.g. required by pf_ring's libpcap)
    #  HAVE_PF_RING              If a found version of libpcap supports PF_RING
    #  HAVE_PCAP_IMMEDIATE_MODE  If the version of libpcap found supports immediate mode
    
    find_path(PCAP_ROOT_DIR
        NAMES include/pcap.h
    )
    
    find_path(PCAP_INCLUDE_DIR
        NAMES pcap.h
        HINTS ${PCAP_ROOT_DIR}/include
    )
    
    set (HINT_DIR ${PCAP_ROOT_DIR}/lib)
    
    # On x64 windows, we should look also for the .lib at /lib/x64/
    # as this is the default path for the WinPcap developer's pack
    if (${CMAKE_SIZEOF_VOID_P} EQUAL 8 AND WIN32)
        set (HINT_DIR ${PCAP_ROOT_DIR}/lib/x64/ ${HINT_DIR})
    endif ()
    
    find_library(PCAP_LIBRARY
        NAMES pcap wpcap
        HINTS ${HINT_DIR}
    )
    
    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args(PCAP DEFAULT_MSG
        PCAP_LIBRARY
        PCAP_INCLUDE_DIR
    )
    
    include(CheckCXXSourceCompiles)
    set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY})
    check_cxx_source_compiles("int main() { return 0; }" PCAP_LINKS_SOLO)
    set(CMAKE_REQUIRED_LIBRARIES)
    
    # check if linking against libpcap also needs to link against a thread library
    if (NOT PCAP_LINKS_SOLO)
        find_package(Threads)
        if (THREADS_FOUND)
            set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
            check_cxx_source_compiles("int main() { return 0; }" PCAP_NEEDS_THREADS)
            set(CMAKE_REQUIRED_LIBRARIES)
        endif (THREADS_FOUND)
        if (THREADS_FOUND AND PCAP_NEEDS_THREADS)
            set(_tmp ${PCAP_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
            list(REMOVE_DUPLICATES _tmp)
            set(PCAP_LIBRARY ${_tmp}
                CACHE STRING "Libraries needed to link against libpcap" FORCE)
        else (THREADS_FOUND AND PCAP_NEEDS_THREADS)
            message(FATAL_ERROR "Couldn't determine how to link against libpcap")
        endif (THREADS_FOUND AND PCAP_NEEDS_THREADS)
    endif (NOT PCAP_LINKS_SOLO)
    
    include(CheckFunctionExists)
    set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY})
    check_function_exists(pcap_get_pfring_id HAVE_PF_RING)
    check_function_exists(pcap_set_immediate_mode HAVE_PCAP_IMMEDIATE_MODE)
    check_function_exists(pcap_set_tstamp_precision HAVE_PCAP_TIMESTAMP_PRECISION)
    set(CMAKE_REQUIRED_LIBRARIES)
    
    mark_as_advanced(
        PCAP_ROOT_DIR
        PCAP_INCLUDE_DIR
        PCAP_LIBRARY
    )

## 删除下缓存重新编译就完美解决拉 ##

# 参考 #

*  [https://github.com/PointCloudLibrary/pcl/issues/2651][https_github.com_PointCloudLibrary_pcl_issues_2651]

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[https_haoqchen.site_2019_07_22_pcl-openni2]: https://haoqchen.site/2019/07/22/pcl-openni2/
[Star]: https://github.com/HaoQChen/HaoQChen.github.io
[github]: https://github.com/mfontanini/libtins/blob/master/cmake/Modules/FindPCAP.cmake
[https_github.com_PointCloudLibrary_pcl_issues_2651]: https://github.com/PointCloudLibrary/pcl/issues/2651