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linux 下安装json 库以及使用，剖析json

https://blog.csdn.net/weixin_36607844/article/details/78957807

https://www.cnblogs.com/skysoot/archive/2012/04/17/2453010.html

https://www.cnblogs.com/fengbohello/p/4066254.html

编译jsoncpp 库遇到的问题

https://www.shuzhiduo.com/A/A2dmxavb5e/

https://www.cnblogs.com/weiweisuhe/p/6266317.html

linux 下安装json库

  1. 下载jsoncpp。 http://sourceforge.net/projects/jsoncpp/files/
  2. 下载scons，这时一个构建工具，用来分析文件之间的依赖。http://sourceforge.net/projects/scons/files/scons/2.1.0/scons-2.1.0.tar.gz/download
  3. 解压 scons tar -xzvf scons
  4. 到scons目录中执行 python setup.py install
  5. 解压jsoncpp tar -xzvf jsoncpp
  6. 到jsoncpp目录下，执行 sudo scons platform=linux-gcc
  7. 将jsoncpp/include目录下的json 文件夹拷贝到 /usr/include/
  8. 将jsoncpp/libs/linux-gcc-4.9.1 目录下的 libjson_linux-gcc-4.9.1.a 拷贝到 /usr/local/lib 下，可以重命名

使用makefile编译jsoncpp

如果想要不使用scons来构建工程，而想要使用makefile，那也是可以编译的。要编译的文件全部位于 /src/lib_json ，其实也就 3个 *.cpp 文件。makefile文件如下：

1
g++ json_reader.cpp json_value.cpp json_writer.cpp -fPIC -Wall -shared -o ../../build/x64/release/libjson.so -I../../include -I.

使用

jsoncpp 目录下docs目录里有demo，参考即可。

问题

  • 解析json格式的时候，出现这个错误：relocation R_X86_64_32 against ‘.rodata’ can not be used when making a shared object;

错误提示最后需要加上 -fPIC 编译选项，需要在编译 jsoncpp 的时候加上 -fPIC 选项。放弃scons编译，使用cmake 编译 1. 新建编译目录

mkdir build


cd build
2. cmake


cmake -DCMAKE_CXX_FLAGS="-fPIC -Dnullptr=NULL"
3. make & make install


make -j4


sudo make install

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