Question

我正在尝试使用mono加载一些原生linux库。我用调试标志运行mono：

Mono: DllImport attempting to load: 'libavformat.57'.
Mono: DllImport error loading library '/home/filoe/Desktop/cscore/cscore/Samples/LinuxSample/bin/Debug/libavformat.57': '/home/filoe/Desktop/cscore/cscore/Samples/LinuxSample/bin/Debug/libavformat.57: cannot open shared object file: No such file or directory'.
Mono: DllImport error loading library '/home/filoe/Desktop/cscore/cscore/Samples/LinuxSample/bin/Debug/libavformat.57.so': 'libavcodec.so.57: cannot open shared object file: No such file or directory'.
Mono: DllImport error loading library '/usr/lib/libavformat.57': '/usr/lib/libavformat.57: cannot open shared object file: No such file or directory'.
Mono: DllImport error loading library '/usr/lib/libavformat.57.so': '/usr/lib/libavformat.57.so: cannot open shared object file: No such file or directory'.
Mono: DllImport error loading library 'libavformat.57': 'libavformat.57: cannot open shared object file: No such file or directory'.
Mono: DllImport error loading library 'libavformat.57.so': 'libavformat.57.so: cannot open shared object file: No such file or directory'.
Mono: DllImport error loading library 'libavformat.57': 'libavformat.57: cannot open shared object file: No such file or directory'.
Mono: DllImport unable to load library 'libavformat.57: cannot open shared object file: No such file or directory'.
Mono: DllImport attempting to load: 'libavformat.57'.

有很多查找位置，但至少其中一个应该匹配。这就是我的目录：

filoe@ubuntu:~/Desktop/cscore/cscore/Samples/LinuxSample/bin/Debug$ dir
CSCore.Ffmpeg.dll     CSCore.Ffmpeg.dll.mdb  CSCore.Linux.dll.config  FFmpeg     libavformat.57  libswresample.2  LinuxSample.exe.mdb
CSCore.Ffmpeg.dll.config  CSCore.Linux.dll   CSCore.Linux.dll.mdb     libavcodec.57  libavutil.55    LinuxSample.exe  log.txt
filoe@ubuntu:~/Desktop/cscore/cscore/Samples/LinuxSample/bin/Debug$

如您所见，libavformat.57就在那里。 单声道告诉我它无法找到？

以下代码演示了已完成的操作：

声明某些DllImport方法：

[DllImport("avformat-57", EntryPoint = "av_register_all", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
internal static extern void av_register_all();
[DllImport("avcodec-57", EntryPoint = "avcodec_register_all", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
internal static extern void avcodec_register_all();

该项目还包含一个名为“{输出程序集的名称} .config”的文件：

<configuration>
  <dllmap os="linux" dll="avcodec-57" target="libavcodec.57"/>
  <dllmap os="linux" dll="avformat-57" target="libavformat.57"/>
</configuration>

如上所示，映射工作正常。 Mono采用“avformat-57”并将其翻译为“libavformat.57”。现在，mono搜索名为“libavformat.57”的库或某些相关名称，如“libavformat.57.so”。单声道在执行程序集的目录中搜索。

但是，它无法找到它正在寻找的文件（根据上面发布的日志）。那为什么呢？

谢谢！

此致

Answer 1

关键是使用命令

ldd libavformat.57

使用以下输出：

linux-vdso.so.1 =>  (0x00007ffdf9bd6000)
libavcodec.so.57 => not found
libavutil.so.55 => not found
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4a74652000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f4a74439000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4a7421b000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4a73e56000)
/lib64/ld-linux-x86-64.so.2 (0x00007f4a74d73000)

因此我将其重命名为建议的名称并再次尝试，但没有成功。下一次尝试用

LD_LIBRARY_PATH=./ ldd libavformat.so.57

成功了。我调整了配置文件，现在我可以用

启动应用程序了

LD_LIBRARY_PATH=./ mono MyApp.exe

在Linux上使用Mono的原生P / Invoke：DllNotFound

1 个答案: