我想在使用C ++的基于ROS的项目中使用VLC库。我正在使用QT Creator作为代码编辑器。

我尝试遵循以下教程来实现mp3文件的简单播放:A simple C program to play mp3 using libvlc

Since then I'm getting the following exceptions:
undefined reference to `libvlc_new'
undefined reference to `libvlc_media_new_path'
undefined reference to `libvlc_media_player_new_from_media'
undefined reference to `libvlc_media_release'
undefined reference to `libvlc_media_player_play'
undefined reference to `libvlc_media_player_stop'
undefined reference to `libvlc_media_player_release'
undefined reference to `libvlc_release'
collect2: ld returned 1 exit status
make[2]: *** [../bin/my_face_tracker_demo] Error 1
make[1]: *** [CMakeFiles/my_face_tracker_demo.dir/all] Error 2
make: *** [all] Error 2
The process "/usr/bin/make" exited with code 2.
Error while building project my_qbo_interaction (target: Desktop)
When executing build step 'Make'


当然,我在文件中添加了#include "vlc/vlc.h"。此外,我按照http://www.cmake.org/Wiki/CMake:How_To_Find_Libraries上的说明进行操作,以确保为链接器添加引用。这是我添加到cmakelist.txt文件中的内容:

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
find_package(LIBVLC REQUIRED)
include_directories(${LIBVLC_INCLUDE_DIRS})
set(LIBS ${LIBS} ${LIBVLC_LIBRARIES})


make能够编译该文件。它还能够找到LIBVLC库。这里是make输出的一部分:


  -找到LibVLC的include-dir路径:/ usr / include
  -找到LibVLC库路径:/usr/lib/libvlc.so
  -找到LibVLCcore库路径:/usr/lib/libvlccore.so
  -找到LibVLC版本:1.1.12(搜索:0.0)
  -配置完成
  -生成已完成的CMake警告:项目未使用手动指定的变量:

CMAKE_TOOLCHAIN_FILE



但是我仍然收到上述错误消息...有人可以帮助我吗?

最佳答案

看起来已经正确找到了VLC库,但是您实际上需要将它们链接到可执行文件中。

您可以通过target_link_libraries命令执行此操作。例如:

set(LIBS ${LIBS} ${LIBVLC_LIBRARIES})
add_executable(MyExe ${TheSources})
target_link_libraries(MyExe ${LIBS})

关于c++ - 未定义对“libvlc_new”的引用,但链接正确吗?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/16429338/

10-12 17:45