项目帮助文档的实现
代码如下：
#ifndef __M_HELPER_H__
#define __M_HELPER_H__
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <sqlite3.h>
#include <random>
#include <sstream>
#include <iomanip>
#include <atomic>
#include <cstring>
#include <cerrno>
#include <sys/stat.h>
#include "mq_logger.hpp"namespace xypmq
{class SqliteHelper{public:typedef int (*SqliteCallback)(void *, int, char **, char **);SqliteHelper(const std::string &dbfile) : _dbfile(dbfile), _handler(nullptr) {}bool open(int safe_level = SQLITE_OPEN_FULLMUTEX){// int sqlite3_open_v2(const char *filename, sqlite3 **ppDb, int flags, const char *zVfs );int ret = sqlite3_open_v2(_dbfile.c_str(), &_handler, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | safe_level, nullptr);if (ret != SQLITE_OK){ELOG("创建/打开sqlite数据库失败: %s", sqlite3_errmsg(_handler));return false;}return true;}bool exec(const std::string &sql, SqliteCallback cb, void *arg){// int sqlite3_exec(sqlite3*, char *sql, int (*callback)(void*,int,char**,char**), void* arg, char **err)int ret = sqlite3_exec(_handler, sql.c_str(), cb, arg, nullptr);if (ret != SQLITE_OK){ELOG("%s \n语句执行失败: %s", sql.c_str(), sqlite3_errmsg(_handler));return false;}return true;}void close(){// int sqlite3_close_v2(sqlite3*)if (_handler)sqlite3_close_v2(_handler);}private:std::string _dbfile;sqlite3 *_handler;};class StrHelper{public:static size_t split(const std::string &str, const std::string &sep, std::vector<std::string> &result){// 分割的思想：// 1.从0位置开始找指定的字符，找到之后开始分割// 2.从上次查找的位置开始继续往后查找指定字符size_t pos, idx = 0;while (idx < str.size()){pos = str.find(sep, idx);if (pos == std::string::npos){// 没有找到，那么从查找位置截取到末尾result.push_back(str.substr(idx));return result.size();}// pos==idx,代表两个分隔符之间没有数据，或者说起始位置就是分割符if (pos == idx){idx = pos + sep.size();continue;}result.push_back(str.substr(idx, pos - idx));idx = pos + sep.size();}return result.size();}};class UUIDHelper{public:static std::string uuid(){std::random_device rd;// size_t num=rd();生成一个机器随机数std::mt19937_64 gernator(rd()); // 通过梅森旋转算法，生成一个伪随机数// 我们要生成的是8个0~255的数std::uniform_int_distribution<int> distribution(0, 255);// std::cout<<distribution(gernator)<<std::endl;// 将生成的数字转成16进制std::stringstream ss;for (int i = 0; i < 8; i++){ss << std::setw(2) << std::setfill('0') << std::hex << distribution(gernator);if (i == 3 || i == 5 || i == 7){ss << "-";}}// 定义一个原子类型整数，初始化为1static std::atomic<size_t> seq(1);size_t num = seq.fetch_add(1);for (int i = 7; i >= 0; i--){ss << std::setw(2) << std::setfill('0') << std::hex << ((num >> (i * 8)) & 0xff);if (i == 6)ss << "-";}return ss.str();}};class FileHelper{public:FileHelper(const std::string &filename) : _filename(filename) {}bool exists(){struct stat st;return (stat(_filename.c_str(), &st) == 0);}size_t size(){struct stat st;int ret = stat(_filename.c_str(), &st);if (ret < 0){return 0;}return st.st_size;}bool read(char *body, size_t offset, size_t len){// 1. 打开文件std::ifstream ifs(_filename, std::ios::binary | std::ios::in);if (ifs.is_open() == false){ELOG("%s 文件打开失败！", _filename.c_str());return false;}// 2. 跳转文件读写位置ifs.seekg(offset, std::ios::beg);// 3. 读取文件数据ifs.read(body, len);if (ifs.good() == false){ELOG("%s 文件读取数据失败！！", _filename.c_str());ifs.close();return false;}// 4. 关闭文件ifs.close();return true;}bool read(std::string &body){// 获取文件大小，根据文件大小调整body的空间size_t fsize = this->size();body.resize(fsize);return read(&body[0], 0, fsize);}bool write(const char *body, size_t offset, size_t len){// 1. 打开文件std::fstream fs(_filename, std::ios::binary | std::ios::in | std::ios::out);if (fs.is_open() == false){ELOG("%s 文件打开失败！", _filename.c_str());return false;}// 2. 跳转到文件指定位置fs.seekp(offset, std::ios::beg);// 3. 写入数据fs.write(body, len);if (fs.good() == false){ELOG("%s 文件写入数据失败！！", _filename.c_str());fs.close();return false;}// 4. 关闭文件fs.close();return true;}bool write(const std::string &body){return write(body.c_str(), 0, body.size());}bool rename(const std::string &nname){return (::rename(_filename.c_str(), nname.c_str()) == 0);}static std::string parentDirectory(const std::string &filename){// /aaa/bb/ccc/ddd/test.txtsize_t pos = filename.find_last_of("/");if (pos == std::string::npos){// test.txtreturn "./";}std::string path = filename.substr(0, pos);return path;}static bool createFile(const std::string &filename){std::fstream ofs(filename, std::ios::binary | std::ios::out);if (ofs.is_open() == false){ELOG("%s 文件打开失败！", filename.c_str());return false;}ofs.close();return true;}static bool removeFile(const std::string &filename){return (::remove(filename.c_str()) == 0);}static bool createDirectory(const std::string &path){// aaa/bbb/ccc cccc// 在多级路径创建中，我们需要从第一个父级目录开始创建size_t pos, idx = 0;while (idx < path.size()){pos = path.find("/", idx);if (pos == std::string::npos){return (mkdir(path.c_str(), 0775) == 0);}std::string subpath = path.substr(0, pos);int ret = mkdir(subpath.c_str(), 0775);if (ret != 0 && errno != EEXIST){ELOG("创建目录 %s 失败: %s", subpath.c_str(), strerror(errno));return false;}idx = pos + 1;}return true;}static bool removeDirectory(const std::string &path){// rm -rf path// system()std::string cmd = "rm -rf " + path;return (system(cmd.c_str()) != -1);}private:std::string _filename;};
}
#endif
)