- 此代码实现了,一个动态映射表,类似于键值对,通过key作为索引点,实现增删改等功能。
此源码使用cJSON库,cJosn官方源码地址
https://sourceforge.net/projects/cjson/
static int init_map_file()
{
cJSON *root,*featuresArr;
cJSON * feature_list[MAX_FEATURE_NUMBER];
root = cJSON_CreateObject();
featuresArr = cJSON_CreateArray();
cJSON *feature_tmp = NULL;
//填充特征值数组
for(int i = 0;i<MAX_FEATURE_NUMBER;i++)
{
feature_list[i] = cJSON_CreateObject();
feature_tmp = feature_list[i];
cJSON_AddNumberToObject(feature_tmp, GID_ITEM,INVALID_GID);
cJSON_AddNumberToObject(feature_tmp, DID_ITEM,INVALID_DB_ID);
cJSON_AddNumberToObject(feature_tmp, STATUS_ITEM,FFS_ST_EMPTY);
cJSON_AddItemToArray(featuresArr, feature_tmp);
}
cJSON_AddItemToObject(root, FEATURELISTS_ITEM, featuresArr);
create_json_map_file(root);
cJSON_Delete(root);
return 0;
}
static int create_json_map_file(cJSON *root)
{
char* buf = cJSON_Print(root);
printf("buf:%s\n",buf);
FILE* fp = fopen(MAPPING_TABLE_FILE,"w");
if(NULL != fp)
{
fwrite(buf,strlen(buf),1,fp);
fclose(fp);
}
else{
printf("Failed to open %s...",MAPPING_TABLE_FILE);
}
free(buf);
return 0;
}
static size_t get_file_size(const char *filepath)
{
/*check input para*/
if(NULL == filepath)
return 0;
struct stat filestat;
memset(&filestat,0,sizeof(struct stat));
/*get file information*/
if(0 == stat(filepath,&filestat))
return filestat.st_size;
else
return 0;
}
static char *read_file_to_buf(const char *filepath)
{
/*check input para*/
if(NULL == filepath)
{
return NULL;
}
/*get file size*/
size_t size = get_file_size(filepath);
if(0 == size)
return NULL;
/*malloc memory*/
char *buf = (char*)malloc(size+1);
if(NULL == buf)
return NULL;
memset(buf,0,size+1);
/*read string from file*/
FILE *fp = fopen(filepath,"r");
size_t readSize = fread(buf,1,size,fp);
if(readSize != size)
{
/*read error*/
free(buf);
buf = NULL;
return NULL;
}
buf[size] = 0;
return buf;
}
static cJSON *prepare_parse_json(const char *filePath)
{
/*check input para*/
if(NULL == filePath)
{
printf("input para is NULL\n");
return NULL;
}
/*read file content to buffer*/
char *buf = read_file_to_buf(filePath);
if(NULL == buf)
{
printf("read file to buf failed\n");
return NULL;
}
/*parse JSON*/
cJSON *pTemp = cJSON_Parse(buf);
free(buf);
buf = NULL;
return pTemp;
}
int json_add_feature(int gid,int db_id)
{
if(0 != access(MAPPING_TABLE_FILE,0))
{
init_map_file();
}
bool isAddSuccess = false;
int featureSts = FFS_ST_IDEL;
cJSON *root = NULL;
root = prepare_parse_json(MAPPING_TABLE_FILE);
cJSON* featuresArr = NULL;
featuresArr = cJSON_GetObjectItem(root,FEATURELISTS_ITEM);
//获取数组大小
int arrLen = cJSON_GetArraySize(featuresArr);
cJSON * arrNumEle = NULL;
for (int i = 0; i < arrLen; i++)
{
//获取数组元素item
arrNumEle = cJSON_GetArrayItem(featuresArr, i);
if(NULL == arrNumEle)
{
continue;
}
featureSts = cJSON_GetObjectItem(arrNumEle, STATUS_ITEM)->valueint;
if(FFS_ST_EMPTY == featureSts)
{
//设置gid
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valueint = gid;
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valuedouble = gid;
//设置db_id
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valueint = db_id;
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valuedouble = db_id;
//设置块储存状态
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valueint = FFS_ST_FILLED;
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valuedouble = FFS_ST_FILLED;
isAddSuccess = true;
break;
}
else{
continue;
}
}
create_json_map_file(root);
cJSON_Delete(root);
sync();
if(isAddSuccess)
{
return 0;
}
else{
return -1;
}
}
int json_delete_feature(int gid)
{
bool isDeleteSuccess = false;
int tmp_gid = INVALID_GID;
cJSON *root = NULL;
root = prepare_parse_json(MAPPING_TABLE_FILE);
cJSON* featuresArr = NULL;
featuresArr = cJSON_GetObjectItem(root,FEATURELISTS_ITEM);
//获取数组大小
int arrLen = cJSON_GetArraySize(featuresArr);
cJSON * arrNumEle = NULL;
for (int i = 0; i < arrLen; i++)
{
//获取数组元素item
arrNumEle = cJSON_GetArrayItem(featuresArr, i);
if(NULL == arrNumEle)
{
continue;
}
tmp_gid = cJSON_GetObjectItem(arrNumEle, GID_ITEM)->valueint;
if(gid != tmp_gid)
{
continue;
}
else{
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valueint = INVALID_GID;
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valuedouble = INVALID_GID;
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valueint = INVALID_DB_ID;
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valuedouble = INVALID_DB_ID;
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valueint = FFS_ST_EMPTY;
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valuedouble = FFS_ST_EMPTY;
isDeleteSuccess = true;
break;
}
}
create_json_map_file(root);
cJSON_Delete(root);
sync();
if(isDeleteSuccess)
{
return 0;
}
else{
return -1;
}
}
#include <stdio.h>
#include "common.h"
int main()
{
json_add_feature(123,656423);
json_add_feature(456,5805213);
json_delete_feature(456);
json_add_feature(673,85353);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/stat.h>
#include "cjson.h"
#include "common.h"
static size_t get_file_size(const char *filepath)
{
/*check input para*/
if(NULL == filepath)
return 0;
struct stat filestat;
memset(&filestat,0,sizeof(struct stat));
/*get file information*/
if(0 == stat(filepath,&filestat))
return filestat.st_size;
else
return 0;
}
static char *read_file_to_buf(const char *filepath)
{
/*check input para*/
if(NULL == filepath)
{
return NULL;
}
/*get file size*/
size_t size = get_file_size(filepath);
if(0 == size)
return NULL;
/*malloc memory*/
char *buf = (char*)malloc(size+1);
if(NULL == buf)
return NULL;
memset(buf,0,size+1);
/*read string from file*/
FILE *fp = fopen(filepath,"r");
size_t readSize = fread(buf,1,size,fp);
if(readSize != size)
{
/*read error*/
free(buf);
buf = NULL;
return NULL;
}
buf[size] = 0;
return buf;
}
static cJSON *prepare_parse_json(const char *filePath)
{
/*check input para*/
if(NULL == filePath)
{
printf("input para is NULL\n");
return NULL;
}
/*read file content to buffer*/
char *buf = read_file_to_buf(filePath);
if(NULL == buf)
{
printf("read file to buf failed\n");
return NULL;
}
/*parse JSON*/
cJSON *pTemp = cJSON_Parse(buf);
free(buf);
buf = NULL;
return pTemp;
}
static int create_json_map_file(cJSON *root)
{
char* buf = cJSON_Print(root);
printf("buf:%s\n",buf);
FILE* fp = fopen(MAPPING_TABLE_FILE,"w");
if(NULL != fp)
{
fwrite(buf,strlen(buf),1,fp);
fclose(fp);
}
else{
printf("Failed to open %s...",MAPPING_TABLE_FILE);
}
free(buf);
return 0;
}
static int init_map_file()
{
cJSON *root,*featuresArr;
cJSON * feature_list[MAX_FEATURE_NUMBER];
root = cJSON_CreateObject();
featuresArr = cJSON_CreateArray();
cJSON *feature_tmp = NULL;
//填充特征值数组
for(int i = 0;i<MAX_FEATURE_NUMBER;i++)
{
feature_list[i] = cJSON_CreateObject();
feature_tmp = feature_list[i];
cJSON_AddNumberToObject(feature_tmp, GID_ITEM,INVALID_GID);
cJSON_AddNumberToObject(feature_tmp, DID_ITEM,INVALID_DB_ID);
cJSON_AddNumberToObject(feature_tmp, STATUS_ITEM,FFS_ST_EMPTY);
cJSON_AddItemToArray(featuresArr, feature_tmp);
}
cJSON_AddItemToObject(root, FEATURELISTS_ITEM, featuresArr);
create_json_map_file(root);
cJSON_Delete(root);
return 0;
}
int json_delete_feature(int gid)
{
bool isDeleteSuccess = false;
int tmp_gid = INVALID_GID;
cJSON *root = NULL;
root = prepare_parse_json(MAPPING_TABLE_FILE);
cJSON* featuresArr = NULL;
featuresArr = cJSON_GetObjectItem(root,FEATURELISTS_ITEM);
//获取数组大小
int arrLen = cJSON_GetArraySize(featuresArr);
cJSON * arrNumEle = NULL;
for (int i = 0; i < arrLen; i++)
{
//获取数组元素item
arrNumEle = cJSON_GetArrayItem(featuresArr, i);
if(NULL == arrNumEle)
{
continue;
}
tmp_gid = cJSON_GetObjectItem(arrNumEle, GID_ITEM)->valueint;
if(gid != tmp_gid)
{
continue;
}
else{
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valueint = INVALID_GID;
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valuedouble = INVALID_GID;
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valueint = INVALID_DB_ID;
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valuedouble = INVALID_DB_ID;
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valueint = FFS_ST_EMPTY;
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valuedouble = FFS_ST_EMPTY;
isDeleteSuccess = true;
break;
}
}
create_json_map_file(root);
cJSON_Delete(root);
sync();
if(isDeleteSuccess)
{
return 0;
}
else{
return -1;
}
}
int json_add_feature(int gid,int db_id)
{
if(0 != access(MAPPING_TABLE_FILE,0))
{
init_map_file();
}
bool isAddSuccess = false;
int featureSts = FFS_ST_IDEL;
cJSON *root = NULL;
root = prepare_parse_json(MAPPING_TABLE_FILE);
cJSON* featuresArr = NULL;
featuresArr = cJSON_GetObjectItem(root,FEATURELISTS_ITEM);
//获取数组大小
int arrLen = cJSON_GetArraySize(featuresArr);
cJSON * arrNumEle = NULL;
for (int i = 0; i < arrLen; i++)
{
//获取数组元素item
arrNumEle = cJSON_GetArrayItem(featuresArr, i);
if(NULL == arrNumEle)
{
continue;
}
featureSts = cJSON_GetObjectItem(arrNumEle, STATUS_ITEM)->valueint;
if(FFS_ST_EMPTY == featureSts)
{
//设置gid
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valueint = gid;
cJSON_GetObjectItem(arrNumEle,GID_ITEM)->valuedouble = gid;
//设置db_id
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valueint = db_id;
cJSON_GetObjectItem(arrNumEle,DID_ITEM)->valuedouble = db_id;
//设置块储存状态
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valueint = FFS_ST_FILLED;
cJSON_GetObjectItem(arrNumEle,STATUS_ITEM)->valuedouble = FFS_ST_FILLED;
isAddSuccess = true;
break;
}
else{
continue;
}
}
create_json_map_file(root);
cJSON_Delete(root);
sync();
if(isAddSuccess)
{
return 0;
}
else{
return -1;
}
}
#ifndef __COMMON_H__
#define __COMMON_H__
#define MAPPING_TABLE_FILE "feature_map.json"
#define MAX_FEATURE_NUMBER (6)
typedef enum tagFeature_STORE_STATUS{
FFS_ST_IDEL = -1,
FFS_ST_EMPTY,
FFS_ST_FILLED
}FSS_ST;
#define INVALID_GID (0xff)
#define INVALID_DB_ID (0xff)
#define FEATURELISTS_ITEM "featureLists" //储存映射表数组名称
#define GID_ITEM "gid" //极氪指定的gid
#define DID_ITEM "did" //算法返回的特征值db_id
#define STATUS_ITEM "status" //预分配块映射表存储状态
int json_add_feature(int gid,int db_id);
int json_delete_feature(int gid);
#endif
文章浏览阅读3.8k次,点赞9次,收藏28次。直接上一个工作中碰到的问题,另外一个系统开启多线程调用我这边的接口,然后我这边会开启多线程批量查询第三方接口并且返回给调用方。使用的是两三年前别人遗留下来的方法,放到线上后发现确实是可以正常取到结果,但是一旦调用,CPU占用就直接100%(部署环境是win server服务器)。因此查看了下相关的老代码并使用JProfiler查看发现是在某个while循环的时候有问题。具体项目代码就不贴了,类似于下面这段代码。while(flag) {//your code;}这里的flag._main函数使用while(1)循环cpu占用99
文章浏览阅读347次。idea shift f6 快捷键无效_idea shift +f6快捷键不生效
文章浏览阅读135次。Ecmacript 中没有DOM 和 BOM核心模块Node为JavaScript提供了很多服务器级别,这些API绝大多数都被包装到了一个具名和核心模块中了,例如文件操作的 fs 核心模块 ,http服务构建的http 模块 path 路径操作模块 os 操作系统信息模块// 用来获取机器信息的var os = require('os')// 用来操作路径的var path = require('path')// 获取当前机器的 CPU 信息console.log(os.cpus._node模块中有很多核心模块,以下不属于核心模块,使用时需下载的是
文章浏览阅读10w+次,点赞435次,收藏3.4k次。SPSS 22 下载安装过程7.6 方差分析与回归分析的SPSS实现7.6.1 SPSS软件概述1 SPSS版本与安装2 SPSS界面3 SPSS特点4 SPSS数据7.6.2 SPSS与方差分析1 单因素方差分析2 双因素方差分析7.6.3 SPSS与回归分析SPSS回归分析过程牙膏价格问题的回归分析_化工数学模型数据回归软件
文章浏览阅读7.5k次。如何利用hutool工具包实现邮件发送功能呢?1、首先引入hutool依赖<dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.19</version></dependency>2、编写邮件发送工具类package com.pc.c..._hutool发送邮件
文章浏览阅读867次,点赞2次,收藏2次。docker安装elasticsearch,elasticsearch-head,kibana,ik分词器安装方式基本有两种,一种是pull的方式,一种是Dockerfile的方式,由于pull的方式pull下来后还需配置许多东西且不便于复用,个人比较喜欢使用Dockerfile的方式所有docker支持的镜像基本都在https://hub.docker.com/docker的官网上能找到合..._docker安装kibana连接elasticsearch并且elasticsearch有密码
文章浏览阅读1.3w次,点赞57次,收藏92次。整理 | 郑丽媛出品 | CSDN(ID:CSDNnews)近年来,随着机器学习的兴起,有一门编程语言逐渐变得火热——Python。得益于其针对机器学习提供了大量开源框架和第三方模块,内置..._beeware
文章浏览阅读7.9k次。//// ViewController.swift// Day_10_Timer//// Created by dongqiangfei on 2018/10/15.// Copyright 2018年 飞飞. All rights reserved.//import UIKitclass ViewController: UIViewController { ..._swift timer 暂停
文章浏览阅读986次,点赞2次,收藏2次。1.硬性等待让当前线程暂停执行,应用场景:代码执行速度太快了,但是UI元素没有立马加载出来,造成两者不同步,这时候就可以让代码等待一下,再去执行找元素的动作线程休眠,强制等待 Thread.sleep(long mills)package com.example.demo;import org.junit.jupiter.api.Test;import org.openqa.selenium.By;import org.openqa.selenium.firefox.Firefox.._元素三大等待
文章浏览阅读3k次,点赞4次,收藏14次。Java软件工程师职位分析_java岗位分析
文章浏览阅读2k次。Java:Unreachable code的解决方法_java unreachable code
文章浏览阅读1w次。1、html中设置标签data-*的值 标题 11111 222222、点击获取当前标签的data-url的值$('dd').on('click', function() { var urlVal = $(this).data('ur_如何根据data-*属性获取对应的标签对象