Installation and use of Hiredis under Linux (i.) __linux

1. How to install Hiredis under Linux
1) Download Address
Https://github.com/redis/hiredis
2) Compiling and installing
The unpacked folder executes Make;make install;
3) header file contains
Include 4) Compilation options
Add ldflags =-lhiredis in makefile file
2. Main structure
The main focus is on 2 structural bodies,
1) Rediscontext

Corresponds to the Redis connection

  /* Context for a connection to Redis
/typedef struct REDISCONTEXT {
    int err;/* Error flags, 0 when there is no Error *
    /char errstr[128];/* String representation of error when applicable
    /int fd;
    int flags;
    Char *obuf; * Write buffer *
    /redisreader *reader/* Protocol reader/
    enum Redisconnectiontype connection_type;
    struct Timeval *timeout;
    struct {
        char *host;
        char *source_addr;
        int port;
    } TCP;
    struct {
        char *path;
    } unix_sock;
} rediscontext;

2) redisreply

Response to Redis command

/* This are the reply object returned by Rediscommand ()/
typedef struct REDISREPLY {
    int type;/* redis_reply_* * /
    Long Long Integer/* The integer when type is Redis_reply_integer
    /int len/* Length of String */
    char * Str /* Used for both redis_reply_error and redis_reply_string
    /size_t elements,/* Number of elements, for redis_reply_a Rray *
    /struct redisreply **element;/* elements vector for Redis_reply_array
/} redisreply;

2. Main interface
There are 4 main interfaces,
1) rediscontext* redisconnect (const char *IP, int port)
Connect Redis.
2 void *rediscommand (Rediscontext *c, const char *format, ...);
Execute Redis Operation command
3) void Freereplyobject (void *reply);
Frees the memory that executes the Redis operation command reply
4) void Redisfree (Rediscontext *c);

Releases the connection context. 3. Exception Handling
There are 4 major anomalies,
1 The obtained rediscontext pointer is null
Exception handling: Try again to establish a new connection context with Redis.
2 Get the Rediscontext pointer err is not 0
Exception handling: Try again to establish a new connection context with Redis.
3 The obtained redisreply pointer is null
Exception handling: Disconnect the Redis connection and then try to execute the command again with Redis.
4 the type of the reply pointer obtained is not expected.
Exception handling: Disconnect the Redis connection and then try to execute the command again with Redis.
Now that Hiredis is finished, you can call it in another module.