环境：ubuntu 20.04

1、先确保开启redis-server

sudo apt-get install redis #安装reids
redis-server               #启动redis服务端                          
redis-cli                  #本地客户端测试连接

2、安装hiredis

git clone https://github.com/redis/hiredis.git
cd hiredis
make
make install

3、redis测试代码

// redis.h
#include <iostream>
#include <hiredis/hiredis.h>
 
class Redis {
public:
    Redis() = default;
 
    ~Redis() {
        _connect = nullptr;
		_reply = nullptr;	    	    
	}
 
	bool connect(std::string host, int port) {
	    _connect = redisConnect(host.c_str(), port);
		if(_connect != nullptr && _connect->err) {
            std::cout << "connect error: " << _connect->errstr << std::endl;
			return false;
		}
		return true;
	}
 
 	void set(std::string key, std::string value) {
        redisCommand(_connect, "SET %s %s", key.c_str(), value.c_str());
	}

    std::string get(std::string key) {
		_reply = static_cast<redisReply*>(redisCommand(_connect, "GET %s", key.c_str()));
		std::string str = _reply->str;
		freeReplyObject(_reply);
		return str;
	}
 
private:
    redisContext* _connect;
	redisReply* _reply;
};

// test.cpp
#include "redis.h"
 
int main() {
	Redis *r = new Redis();
	if(!r->connect("127.0.0.1", 6379)) {
		printf("connect error!\n");
		return 0;
	}
	r->set("name", "wuyi");
	printf("Get the name is %s\n", r->get("name").c_str());
	delete r;
	return 0;
}

编译并运行

g++ test.cpp -lhiredis -o redis
./redis

参考

C++操作Redis数据库_ACHelloWorld的博客-CSDN博客