自定义日志库

        暂时设计成这样，后续持续优化中:

#define _CRT_SECURE_NO_WARNINGS#include<iostream>#include<fstream>#include<string>#include<mutex>#include<direct.h>#include<time.h>#include<io.h>#include<algorithm>#include<condition_variable>#include<cstdio>#include "macro_define.h"#include<stdarg.h>#include<sstream>typedef enum LOG_LEVEL {VERBOSE,DEBUG,INFO,WARN,ERROR} LogLevel;class LogWriter {private:const int MAX_CACHE_FILE_COUNT = 1;static LogWriter *Writer; // 引用性声明std::mutex Mutex;std::string FileDir = "E:/fsi/log/";std::string FileName = "";std::string CurrTime = "";std::string FilePath = "";public: LogWriter() {CreateDirectory();CreateFileName();CreateFilePath();}public:~LogWriter() {Close();}public:const char* LogLevelToString(LogLevel l) {switch (l) {case VERBOSE:return "VERBOSE";case DEBUG:return "DEBUG";case INFO:return "INFO";case WARN:return "WARN";case ERROR:return "ERROR";default:return "UNKNOWN";}}static LogWriter* GetInstance() {if (Writer == nullptr) {Writer = new LogWriter;}return Writer;}LogWriter* SetFileDirectory(std::string fileDriectory) {FileDir.assign(fileDriectory);CreateDirectory();CreateFilePath();return this;}void Write(LogLevel level, std::string message, int cnt, ...) {Mutex.lock();if (GetLogFileCount() > MAX_CACHE_FILE_COUNT) {DeleteDirectoryFile();}std::ofstream file_out(FilePath, std::ios::out | std::ios::app);if (file_out.is_open()) {va_list args;// std::string arg;std::string arg;va_start(args, cnt);int len = 0;std::cout << args << std::endl;while (len < cnt) {arg = va_arg(args, std::string);len++;file_out << "[" << arg << "]";}va_end(args);file_out << GetWriteTime();file_out << message << std::endl;file_out.close();}Mutex.unlock();}void CreateFileName() {char now[255];time_t Today;tm* Time;time(&Today);Time = localtime(&Today);strftime(now, 255, "%Y%m%d", Time);if (CurrTime.empty() || CurrTime != now) {FileName.assign("log").append(now).append(".txt");}}std::string GetWriteTime() {char now[255];time_t Today;tm* Time;time(&Today);Time = localtime(&Today);strftime(now, 255, "[%Y/%m/%d %H:%M:%S]", Time);return now;}void CreateDirectory() {// 判断目录是否存在  if (_chdir(FileDir.c_str()) == 0) {_mkdir(FileDir.c_str());}}void CreateFilePath() {FilePath = FileDir + FileName;}int GetLogFileCount(){//文件句柄long   hFile = 0;//文件信息struct _finddata_t fileinfo;int file_count = 0;if ((hFile = _findfirst((FileDir + "*").c_str(), &fileinfo)) != -1) {while (_findnext(hFile, &fileinfo) == 0) {if (fileinfo.name[0] == '.' && fileinfo.name[1] == '.') {continue;}file_count++;}_findclose(hFile);}return file_count;}void DeleteDirectoryFile() {//文件句柄long   hFile = 0;//文件信息struct _finddata_t fileinfo;int file_count = 0;if ((hFile = _findfirst((FileDir + "*").c_str(), &fileinfo)) != -1) {while (_findnext(hFile, &fileinfo) == 0) {if (fileinfo.name[0] == '.' && fileinfo.name[1] == '.') {continue;}remove((FileDir + fileinfo.name).c_str());}_findclose(hFile);}}void Close() {delete Writer;Writer = nullptr;}};// 定义性声明LogWriter * LogWriter::Writer; std::string Int_to_String(int n){std::ostringstream stream;// n为int类型stream << n;  return stream.str();}void main() {std::string auto_file = __FILE__;std::cout << __FILE__ << std::endl;LogWriter::GetInstance()->Write(LogLevel::VERBOSE, "wode未来不是梦1", 2, auto_file, "Line" + Int_to_String(__LINE__));LogWriter::GetInstance()->Write(LogLevel::DEBUG, "wode未来不是梦2", 2, auto_file, Int_to_String(__LINE__));LogWriter::GetInstance()->Write(LogLevel::INFO, "wode未来不是梦3", 2, auto_file, Int_to_String(__LINE__));LogWriter::GetInstance()->Write(LogLevel::WARN, "wode未来不是梦4", 2, auto_file, Int_to_String(__LINE__));LogWriter::GetInstance()->Write(LogLevel::ERROR, "wode未来不是梦5", 2, auto_file, Int_to_String(__LINE__));LogWriter::GetInstance()->Write(LogLevel::VERBOSE, "wode未来不是梦6", 2, auto_file, Int_to_String(__LINE__));LogWriter::GetInstance()->Write(LogLevel::DEBUG, "wode未来不是梦7", 2, auto_file, Int_to_String(__LINE__));system("pause");return;}