C++库libjsoncpp使用

前言

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1. C 库Json解析

link

2. C++ libjsoncpp.a解析

2-1. 下载和编译

jsoncpp

ARM交叉编译：
1. tar xvzf jsoncpp-src-0.5.0.tar.gz
2. mkdir arm_jsoncpp;cp include arm_jsoncpp -r;cp src/lib_json/* arm_jsoncpp;cd arm_jsoncpp
3. 编译静态库: aarch64-himix100-linux-g++ -c *.cpp -I./include -fPIC; ar cr libjsoncpp.a *.o
4. 编译动态库: aarch64-himix100-linux-g++ -shared -fPIC *.cpp -I./include -o libjsoncpp.so

使用脚本编译（将3,4步拎出来编写个脚本）,命名为build.sh：

#!/bin/sh

if [ "$1" == "a" ];then
    echo -e "\033[1;32m编译静态库.\033[0m"
    aarch64-himix100-linux-g++ -c *.cpp -I./include ;ar rcs libjsoncpp.a *.o;rm *.o


elif [ "$1" == "so" ];then
    echo -e "\033[1;32m编译动态库.\033[0m"
    aarch64-himix100-linux-g++ -shared -fPIC *.cpp -I./include -o libjsoncpp.so
else
    echo -e "默认编译静态库"
    aarch64-himix100-linux-g++ -c *.cpp -I./include ;ar rcs libjsoncpp.a *.o

fi

执行sh build.sh a表示编译为静态库，sh build.sh so表示编译动态库

2-2. 使用Json::FastWriter封JSON包(不推荐)

该方式不推荐，因为会报如下警告信息：

json.cpp: In function 'int main()':
json.cpp:8:19: warning: 'FastWriter' is deprecated: Use StreamWriterBuilder instead [-Wdeprecated-d