一个简单的log用c++编写

落日映苍穹つ 2024-04-17 05:50 75阅读 0赞

#ifndef __debug_log__
    #define __debug_log__
    
    //#define __WRITE_FILE__
    
    #include <stdio.h>
    #include <time.h>
    #include <string.h>
    #include <stdarg.h>
    
    void DEBUG_LOG(const char *msg, ...);
    
    class Debug_LOG {
    private:
    	Debug_LOG();
    	~Debug_LOG();
    	void create_log_file();
    public:
    	static Debug_LOG *log();
    	void write_log(const char *msg);
    private:
    	static Debug_LOG *m_log;
    	time_t tim;
    	struct tm *t;
    	FILE *fp;
    	char filepath[32];
    	char message[256];
    	struct tm last_log_time;
    };
    
    #endif

#include "stdafx.h"
    #include "debug_log.h"
    #include <winbase.h>
    
    void DEBUG_LOG(const char *msg, ...) {
    	//char message[4096] = {0};
    	//va_list args;
    	//va_start(args, msg);
    	//vsprintf(message, msg, args);
    	//va_end(args);
    	//Debug_LOG::log()->write_log(message);
    }
    
    Debug_LOG *Debug_LOG::m_log = NULL;
    
    Debug_LOG::Debug_LOG():
    	tim(0),
    	t(NULL),
    	fp(NULL),
    	filepath(),
    	message(),
    	last_log_time()
    {
    #ifdef __WRITE_FILE__
    	create_log_file();
    #endif
    }
    
    Debug_LOG::~Debug_LOG(){
    #ifdef __WRITE_FILE__
    	fclose(fp);
    #endif
    }
    
    void Debug_LOG::create_log_file(){
    	if(fp != NULL)
    		fclose(fp);
    
    	sprintf(filepath, "./log/debuglog_");
    	time(&tim); 
    	t = localtime(&tim);
    	memcpy(&last_log_time, t, sizeof(struct tm));
    	sprintf(filepath + 15, "%02d_%02d",t->tm_mon + 1, t->tm_mday); 
    	fp = fopen(filepath, "a+");
    }
    
    Debug_LOG *Debug_LOG::log(){
    	if(m_log == NULL){
    		m_log = new Debug_LOG();
    	}
    	return m_log;
    }
    
    void Debug_LOG::write_log(const char *msg){
    	time(&tim); 
    	t = localtime(&tim); 
    	sprintf(message, "[%02d:%02d:%02d] %s\n", t->tm_hour, t->tm_min, t->tm_sec, msg);
    #ifdef __WRITE_FILE__
    	if(t->tm_mday != last_log_time.tm_mday || t->tm_mon != last_log_time.tm_mon
    		|| t->tm_year != last_log_time.tm_year)
    		create_log_file();
    	fwrite(message, strlen(message), 1, fp);
    	fflush(fp);
    #else
    	printf("\n%s", message);
    	OutputDebugString(message);
    	fflush(stdout);
    #endif
    }