c语 json cJSON安装

git clone https://github.com/DaveGamble/cJSON.git
cd cJSON/
mkdir build
cd build/
cmake ..
make
sudo make install

sudo vim /etc/ld.so.conf

在第二行加上

/usr/local/lib

保存
执行命令

/sbin/ldconfig

最简单的例子：

#include 
#include 

cJSON *ft_msg() {
     
	cJSON *root = cJSON_CreateObject();
	cJSON_AddItemToObject(root, "FT_TEST", cJSON_CreateString("0x01"));
	cJSON_AddItemToObject(root, "FT_WALL", cJSON_CreateString("0x02"));
	cJSON_AddItemToObject(root, "FT_MSG", cJSON_CreateString("0x04"));
	cJSON_AddItemToObject(root, "FT_ACK", cJSON_CreateString("0x08"));
	cJSON_AddItemToObject(root, "FT_FIN", cJSON_CreateString("0x10"));
	cJSON_AddItemToObject(root, "FT_CTL", cJSON_CreateString("0x20"));
	cJSON_AddItemToObject(root, "FT_GAME", cJSON_CreateString("0x40"));
	cJSON_AddItemToObject(root, "FT_SCORE", cJSON_CreateString("0x80"));
	cJSON_AddItemToObject(root, "FT_GAMEOVER", cJSON_CreateString("0x100"));
	return root;
}

int main() {
     
	printf("%s\n", cJSON_Print(ft_msg()));
	return 0;
}

gcc test.c -lcjson