我嘗試寫一個簡單的記錄器,但ofstream寫入十六進制而不是字符到文件。 定義:ofstream寫入十六進制而不是字符*
#pragma once
#include <iostream>
#include <fstream>
#include <string>
#define LOG Logger::getInstance()
class Logger
{
public:
static Logger m_instance;
static Logger &getInstance()
{
if (m_logfile == nullptr)
{
m_logfile = new std::ofstream(m_logfile_string.c_str(),
std::ofstream::out | std::ofstream::app);
}
return m_instance;
}
Logger &operator<<(const std::string &c);
Logger &operator<<(const char c[]);
private:
static std::ofstream *m_logfile;
static std::string m_logfile_string;
Logger() {};
Logger(const Logger &) = delete;
Logger(Logger &&other) = delete;
Logger &operator=(const Logger &other) = delete;
Logger &operator=(Logger &&other) = delete;
~Logger()
{
if (m_logfile != nullptr)
m_logfile->close();
};
std::string currentDateTime() const;
};
Impl。
#include "Logger.h"
#include <iostream>
#include <ctime>
Logger Logger::m_instance;
std::ofstream *Logger::m_logfile = nullptr;
std::string Logger::m_logfile_string = "log.txt";
Logger &Logger::operator<<(const std::string &c)
{
this->operator<<(c.c_str());
return *this;
}
Logger &Logger::operator<<(const char c[])
{
std::cout << currentDateTime() << " - "
<< c << std::endl;
m_logfile->operator<<(c);
return *this;
}
// Get current date/time, format is YYYY-MM-DD.HH:mm:ss
std::string Logger::currentDateTime() const
{
auto now = time(nullptr);
struct tm tstruct;
char buf[80];
tstruct = *localtime(&now);
strftime(buf, sizeof(buf), "%Y-%m-%d.%X", &tstruct);
return buf;
}
用法:
#include "Logger.h"
void main()
{
LOG << "started"; // Logger::getInstance() << "started";
}
結果: 00007FF696EF3C00
在log.txt
控制檯輸出是正確的。
這裏怎麼回事?
您是否已經嘗試過'Logger&Logger :: operator <<(const char * c)'? –
如果我將方法更改爲const char *,則結果相同 – BennX
它將打印指針而不是字符串的內容。你使用哪個工具鏈和操作系統?似乎在Mac OS X上使用clang和gcc可以正常工作。 – gavinb