记录日志类

    近段工作中需要记录接受到的数据，由于只是一串字符串，放入数据库实在是没有必要，因此改为写记录日志，别人给了一个日志类，感觉太复杂了，看起来浪费时间，于是自己封装了一个日志类。包括基本的时间戳，日志级别等。

//写文件日志#ifndef MY_LOG_H#define MY_LOG_H#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <time.h>#include <sys/time.h>#include <string.h>#include <string>#include <sys/types.h>#include <sys/stat.h>#include <dirent.h>#include <fcntl.h>#include <errno.h>#define FILE_PATH_LEN128/*文件路径长度*/enum value_set_get{    SETVALUE = 0,    GETVALUE,};enum log_level{    INFO = 0,    ERR,    CRIT,};class My_log{public:    My_log();    My_log( const char* log_path, const  char* log_name );    ~My_log();    int open_file(char *path, char* name);    int current_dir(char*, int flag);    int log_path( char*, int flag );  // set or get the log path    int log_name( char*, int flag );   //set or get the log name    int current_dateTime( char*);// get the current date time    int write_log( char* mseesage, int info_level );//write log    int get_initParam( char* file_name, const char *name, char* para);//get the inti param    char* trim(char *str); //delete the space    int is_directory(char*);    int current_dir_default();private:    char m_log_path[FILE_PATH_LEN];    char m_log_name[FILE_PATH_LEN];    char m_start_dateTime[FILE_PATH_LEN];    char m_init_fileName[FILE_PATH_LEN];    char m_init_filePath[FILE_PATH_LEN];    char m_curren_dir[FILE_PATH_LEN];    int m_logfd;    char m_system_name[FILE_PATH_LEN];    char m_version[FILE_PATH_LEN];    char m_old_day[9];};#endif // MY_LOG_H

实现文件：

如果在多线程中，需要考虑同步情况，对写操作进行加锁

#include "my_log.h"#include <stdio.h>My_log::My_log(){    //init    memset(m_log_name, 0, sizeof(m_log_name));    memset(m_log_path, 0, sizeof(m_log_path));    memset(m_start_dateTime, 0, sizeof(m_start_dateTime));    memset(m_init_fileName, 0, sizeof(m_init_fileName));    memset(m_curren_dir, 0, sizeof(m_curren_dir));    memset(m_old_day, 0, sizeof(m_old_day));    //init file name and path    strncpy( m_init_fileName, "log.ini", strlen("log.ini"));  //default    if(current_dir_default())   //set the default dir    {        fprintf(stderr, "get thr current dir error\n");        exit(-1);    }    //get init infomation    if(get_initParam(m_init_fileName, "LOGPATH", m_log_path)            || get_initParam(m_init_fileName, "SYSTEMNAME", m_system_name)            || get_initParam(m_init_fileName, "VERSION", m_version))    {        fprintf(stderr, " get the info from inifile  [%s] error\n", m_init_fileName);        exit(-1);    }    if(is_directory(m_log_path))    {        fprintf(stderr, "the path is not a valid path\n");        exit(-1);    }    current_dateTime(m_start_dateTime);    strncat(m_log_name, m_system_name, strlen(m_system_name));    strncat(m_log_name, m_version, strlen(m_version));    strncat(m_log_name, m_start_dateTime, 10);  //2013111220    strncat(m_old_day, m_start_dateTime, 10);    if(open_file(m_log_path, m_log_name))    {        fprintf(stderr, "open file failed\n");        exit(-1);    }}My_log::My_log(const char *log_path, const char *log_name){    memset(m_log_name, 0, sizeof(m_log_name));    memset(m_log_path, 0, sizeof(m_log_path));    memset(m_start_dateTime, 0, sizeof(m_start_dateTime));    memset(m_init_fileName, 0, sizeof(m_init_fileName));    memset(m_curren_dir, 0, sizeof(m_curren_dir));    m_logfd = 0;    current_dateTime(m_start_dateTime);//    strncat(m_log_name, m_system_name, strlen(m_system_name));//    strncat(m_log_name, m_version, strlen(m_version));//    strncat(m_log_name, m_start_dateTime, strlen(m_start_dateTime));    strncat(m_log_name, log_name, strlen(log_name));    strncpy(m_log_path, log_path, strlen(log_path));    char time[15] = {0};    current_dateTime(time);    strncat(m_log_name, "_", 1);    strncat(m_log_name, time, 10);  //append the  time after the name    if(open_file(m_log_path, m_log_name))    {        fprintf(stderr, "open file failed\n");        exit(-1);    }}int My_log::open_file(char *path, char *name){    if(is_directory(path))    {        fprintf(stderr, "the path is not a valid path\n");        return (-1);    }    ////    if(path[strlen(path) -1] != '/')    {        strcat(path, "/");    }    strcat(path, "log");    if(access(path, F_OK))  //if not exit, create it    {        if(mkdir(path, S_IRWXU))        {            fprintf(stderr, "make dir error : %s\n", strerror(errno));            return (-1);        }    }    if(!access(path, W_OK))    {        chmod(path, S_IRWXU);    }    if(path[strlen(path) -1] != '/')    {        strcat(path, "/");    }  ////    char tmp[FILE_PATH_LEN] = {0};    sprintf(tmp, "%s%s.log", path, name);    if(access(tmp, F_OK))    {        if((m_logfd = open(tmp, O_RDWR|O_CREAT, S_IRWXU)) < 0)       //if not exit, create it        {            fprintf(stderr, "open the log file [%s] error : %s\n", tmp, strerror(errno));            return (-1);        }    }    else    {        if(access(tmp, W_OK))  //check the log file can be write        {             if(chmod(tmp, S_IRUSR | S_IWUSR))    //change the mode             {                 fprintf(stderr, "chmod [%s] failed : %s\n", tmp, strerror(errno));                 return -1;             }        }       if((m_logfd = open(tmp, O_WRONLY|O_APPEND)) < 0)    //if eixt, append it       {            fprintf(stderr, "open the log file [%s] error : %s\n", tmp, strerror(errno));            return (-1);       }    }    return 0;}My_log::~My_log(){    close(m_logfd);}int My_log::current_dir_default(){    char dir_name[100];    char *pos;    strcpy(dir_name, get_current_dir_name());    pos = strrchr(dir_name, '/');    *(pos+1) = '\0';    strcat(m_curren_dir, dir_name);    strcat(m_curren_dir, "my_log/");    return 0;}int My_log::current_dir(char *dir, int flag){    switch(flag)    {    case SETVALUE:        strncpy(m_curren_dir, dir, strlen(dir));        break;    case GETVALUE:        strncpy(dir, m_curren_dir, strlen(m_curren_dir));        break;    }    return 0;}int My_log::write_log(char *meesage, int info_level){    char buf[512] = {0};    char sinfo_level[5] = {0};    char curr_date_time[15] = {0};    switch(info_level)    {    case INFO:        strcpy(sinfo_level, "INFO");        break;    case ERR:        strcpy(sinfo_level, "WARN");        break;    case CRIT:        strcpy(sinfo_level, "CRIT");        break;    default:        strcpy(sinfo_level, "INFO");    }    current_dateTime(curr_date_time);    if(!strncmp(m_old_day, curr_date_time, 10)) //if a new day, create new log file    {        strncpy(m_old_day, curr_date_time, 10);        if(open_file("./", "com"))        {            fprintf(stderr, "create new log file error\n");            return -1;        }        fprintf(stdout, "create new log file done\n");    }    sprintf(buf, "%s%s::%s\n", sinfo_level, curr_date_time, meesage);    printf("write_log:%s", buf);    write(m_logfd, buf, strlen(buf));    return 0;}int My_log::is_directory(char *path){    struct stat info;    if(stat(path, &info))    {        fprintf(stderr, "check the path [%s] error\n", path);        return -1;    }    if(info.st_mode & S_IFDIR)    {        return 0;    }    else    {        return 1;    }}int My_log::current_dateTime(char *date_time){    time_t sys_time;    struct tm *plocal_time;    time(&sys_time);    plocal_time = localtime(&sys_time);    sprintf(date_time, "%04d%02d%02d%02d%02d%02d",            plocal_time->tm_year+1900, plocal_time->tm_mon+1, plocal_time->tm_mday,            plocal_time->tm_hour, plocal_time->tm_min,   plocal_time->tm_sec);//    switch(flag)//    {//    case SETVALUE:strncpy(m_current_dateTime, date_time, sizeof(date_time));//                    break;//    case GETVALUE:strncpy(date_time, m_current_dateTime, sizeof(m_current_dateTime));//        break;//    }    return 0;}int My_log::get_initParam(char *file_name, const char *name, char *para){    char line[256] = {0};    char *pos;    FILE *fp;    char tmp[100] = {0};    strncpy(tmp, m_curren_dir, strlen(m_curren_dir));    strcat(tmp, file_name);    if((fp = fopen(tmp, "r")) == NULL)    {        fprintf(stderr, "open inti file [%s] error\n", file_name);        perror("");        return -1;    }    if(fgets(line, 255, fp) == NULL)    {        fprintf(stderr, "read the init file error\n");        perror("");        return -1;    }    while( !feof(fp))    {        pos = strchr( line, '=');        if(pos != NULL)        {            *pos = '\0';            trim(line);            if(strcmp( line, name ) == 0)            {                strcpy(para, pos+1);                trim(para);                fclose(fp);                return 0;            }        }        if(fgets( line, 255, fp) == NULL && !feof(fp))        {            fprintf(stderr, "read the init file error\n");            perror("");            return -1;        }    }    fclose(fp);    return -1;}char* My_log::trim(char *str){    int len;    char *p;    p =str;    while(isspace((int)(*p)))        p++;    strcpy(str, p);    len = strlen(str);    if(len <= 0)        return str;    while(isspace((int)str[len -1]))        len--;    str[len] = '\0';    return str;}int My_log::log_name(char *name, int flag){    switch (flag)    {    case SETVALUE:        strncpy(m_log_name , name, strlen(name));        break;    case GETVALUE:        strncpy(name, m_log_name, strlen(m_log_name));        break;    default:        strncpy(name, m_log_name, strlen(m_log_name));        break;    }}int My_log::log_path(char *path, int flag){    switch (flag)    {    case SETVALUE:        strncpy(m_log_path , path, strlen(path));        break;    case GETVALUE:        strncpy(path, m_log_path, strlen(m_log_path));        break;    default:        strncpy(path, m_log_path, strlen(m_log_path));        break;    }}

demo示例：

#include <iostream>#include "my_log.h"using namespace std;int main1(){    My_log log("./", "read_com");    log.write_log("starting", INFO);    sleep(1);    log.write_log("hello world", INFO);    return 0;}