题
请考虑以下示例:
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <hiredis/hiredis.h>
int main(int argc, char **argv) {
redisContext *redis;
redisReply *reply;
redis = redisConnect("127.0.0.1", 6379);
if(redis->err) {
fprintf(stderr, "Connection error: %s\n", redis->errstr);
exit(EXIT_FAILURE);
}
reply = redisCommand(redis, "SET %s %s", "foo", "bar");
printf("SET %s %s: %s\n", "foo", "bar", reply->str);
freeReplyObject(reply);
reply = redisCommand(redis, "SET %s %s", "name", "value");
printf("SET %s %s: %s\n", "name", "value", reply->str);
freeReplyObject(reply);
reply = redisCommand(redis, "MGET %s %s", "foo", "name");
printf("MGET %s %s: %s\n", "foo", "name", reply->str);
freeReplyObject(reply);
exit(EXIT_SUCCESS);
}
.
输出是:
PING: PONG
SET foo bar: OK
GET foo: bar
SET name value: OK
MGET foo name: (null)
.
它是关于从mget返回的。我可以使用聘用吗?
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解决方案
重新启动是键入的对象(请参阅类型字段),多批次回复具有特定类型(Redis_reply_Array)。str字段在这种情况下无关。
从寄生虫文件:
The number of elements in the multi bulk reply is stored in reply->elements.
Every element in the multi bulk reply is a redisReply object as well
and can be accessed via reply->element[..index..].
Redis may reply with nested arrays but this is fully supported.
.
所以你的代码应该如下更改:
reply = redisCommand(redis, "MGET %s %s", "foo", "name" );
if ( reply->type == REDIS_REPLY_ERROR )
printf( "Error: %s\n", reply->str );
else if ( reply->type != REDIS_REPLY_ARRAY )
printf( "Unexpected type: %d\n", reply->type );
else
{
int i;
for ( i=0; i<reply->elements; ++i )
printf( "Result: %s\n", reply->element[i]->str );
}
freeReplyObject(reply);
.
通过此变化,输出现在:
SET foo bar: OK
SET name value: OK
Result: bar
Result: value
.
注意:由于FreeReplyObject删除了整个树,因此无需释放每个单个元素。
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