0. 准备工作
github 官方地址是 https://github.com/DaveGamble/cJSON
安装 环境是 Ubuntu 20.04。需要先安装cmake。 apt install cmake
1. 具体操作如下 在linux上找个地方
git clone https://github.com/DaveGamble/cJSON.git
cd cJSON/
mkdir build
cd build/
cmake ..
make
make install
执行完上述命令后，
cJSON.h 头文件会安装在 /usr/local/include/cjson 目录下。
libcjson.so 库文件会安装在 /usr/local/lib 目录下。
2. 配置下变量
还需要将/usr/local/lib目录添加到 /etc/ld.so.conf 文件中，
vi /etc/ld.so.conf 然后添加
include /usr/local/lib
保存后，执行
/sbin/ldconfig
否则程序在运行时会报
error while loading shared libraries: libcjson.so.1: cannot open shared object file: No such file or directory 错误。
3. 程序编译测试
#include
#include
#include "cjson/cJSON.h"
int main(void)
{
char *json_data = NULL;
char *data = "{"love":["LOL","Go shopping"]}";
//从缓冲区中解析出JSON结构
cJSON * json= cJSON_Parse(data);
//将传入的JSON结构转化为字符串 并打印
json_data = cJSON_Print(json);
printf("data:%sn", json_data);
json = cJSON_CreateObject();
cJSON_AddStringToObject(json, "name", "lilei");
cJSON_AddStringToObject(json, "sex", "man");
cJSON_AddNumberToObject(json, "age", 18);
cJSON_AddItemToObject(json,"love",array=cJSON_CreateArray());
cJSON_AddItemToArray(array,cJSON_CreateString("LOL"));
cJSON_AddItemToArray(array,cJSON_CreateString("NBA"));
cJSON_AddItemToArray(array,cJSON_CreateString("Girls"));
cJSON_AddNumberToObject(json,"score",61);
cJSON_AddStringToObject(json,"address","shanghai");
cJSON_AddItemToObject(json,"name",cJSON_CreateString("韩梅梅"));
cJSON_AddStringToObject(json, "sex", cJSON_CreateString("girl"));
// cJSON_AddNumberToObject(json,"age",cJSON_CreateNumber(17));
cJSON_AddNumberToObject(json,"age",17);
cJSON_AddItemToObject(json,"love",array=cJSON_CreateArray());
cJSON_AddItemToArray(array,cJSON_CreateString("BOOK"));
cJSON_AddItemToArray(array,cJSON_CreateString("Music"));
cJSON_AddItemToArray(array,cJSON_CreateString("Go shopping"));
cJSON_AddNumberToObject(json,"score",99);
cJSON_AddStringToObject(json,"address","beijing");
cJSON_AddStringToObject(json, "name", "小红");
cJSON_AddStringToObject(json, "sex", "female");
cJSON_AddNumberToObject(json, "age", 18);
cJSON_AddItemToObject(json,"love",array = cJSON_CreateObject());
cJSON_AddItemToObject(array, "爱好1", cJSON_CreateString("LOL"));
cJSON_AddItemToObject(array, "爱好2", cJSON_CreateString("NBA"));
cJSON_AddStringToObject(array, "爱好3", cJSON_CreateString("Girls"));
cJSON_AddNumberToObject(json,"score",81);
cJSON_AddStringToObject(json,"address","hk");
json_data = cJSON_Print(json);
printf("n***************************n%sn", json_data);
//将JSON结构所占用的数据空间释放
free(json_data);
cJSON_Delete(json);
return 0;
}
编译 ： gcc -o testjson -g testJson.c -lcjson -lm
执行 ： ./testjson
