求一个简单写日志的类

#include "common_include.h"
#include "LogLite.h"
namespace fs = boost::filesystem;
LogLite::LogLite(const std::string& path, const std::string& baseFileName):
m_path(path),
m_baseFileName(baseFileName),
m_file(NULL),
m_fileNum(0),
m_stop(false)
{
    fs::create_directories(path);
    CreateLogFile();
    m_thread.reset(new std::thread(&LogLite::WriteThreadHandler, this));
}
LogLite::~LogLite()
{
    m_stop = true;
    m_cv.notify_one();
    m_thread->join();
}
void LogLite::CreateLogFile()
{
    if(m_file != NULL)
    {
        fclose(m_file);
        m_file = NULL;
    }
    time_t t = time(NULL);
    struct tm* now = localtime(&t);
    char name[UCHAR_MAX] = {0};
    snprintf(name, UCHAR_MAX, "%s/%s_%04d%02d%02d%02d%02d%02d_%05d.log", m_path.c_str(), m_baseFileName.c_str(),
        now->tm_year + 1900, now->tm_mon + 1, now->tm_mday, now->tm_hour, now->tm_min, now->tm_sec, ++m_fileNum);
    m_file = fopen(name, "w");
    assert(m_file != NULL);
}
void LogLite::Write(const char* level, int line, const char* fileName, const char* funcName, const char* fmt, ...)
{
    struct Item item = {0};
    va_list ap;
    va_start(ap, fmt);
    int n = vsnprintf(item.text, FORMAT_TEXT_LEN, fmt, ap);
    va_end(ap);
    if(n > 0)
    {
        item.text[std::min(n, (int)FORMAT_TEXT_LEN)] = "\n";
        item.text[std::min(n + 1, (int)FORMAT_TEXT_LEN)] = "\n";
        item.size = std::min(n + 2, (int)FORMAT_TEXT_LEN);
        struct Item info = {0};
        CreateItemInfo(level, line, fileName, funcName, info);
        {
            std::unique_lock<std::mutex> lock(m_mutex);
            m_items.push_back(info);
            m_items.push_back(item);
        }
    }
    if(m_items.size() > WRITE_ITEM_COUNT)
    {
        m_cv.notify_one();
    }
}
void LogLite::WriteHex(const char* level, int line, const char* fileName, const char* funcName, const void* buf, size_t size)
{
    struct Item item = {0};
    int n = 0;
    for(size_t i = 0; i < size && n < FORMAT_TEXT_LEN; i++)
    {
        int c = snprintf(&item.text[n], FORMAT_TEXT_LEN - n, "%02X ", *((uint8_t*)buf + i));
        n += c;
    }
    item.text[std::min(n, (int)FORMAT_TEXT_LEN)] = "\n";
    item.text[std::min(n + 1, (int)FORMAT_TEXT_LEN)] = "\n";
    item.size = std::min(n + 2, (int)FORMAT_TEXT_LEN);
    struct Item info = {0};
    CreateItemInfo(level, line, fileName, funcName, info);
    {
        std::unique_lock<std::mutex> lock(m_mutex);
        m_items.push_back(info);
        m_items.push_back(item);
    }
    if(m_items.size() > WRITE_ITEM_COUNT)
    {
        m_cv.notify_one();
    }
}
void LogLite::CreateItemInfo(const char* level, int line, const char* fileName, const char* funcName, struct Item& item)
{
    time_t t = time(NULL);
    struct tm* now = localtime(&t);
    struct timeval tv;
    gettimeofday(&tv, NULL);
    int n = snprintf(item.text, FORMAT_TEXT_LEN, "%s %04d-%02d-%02d %02d:%02d:%02d.%03ld line=%04d file=%s func=%s thread=%u\n",
             level, now->tm_year + 1900, now->tm_mon + 1, now->tm_mday, now->tm_hour, now->tm_min, now->tm_sec, tv.tv_usec / 1000,
             line, fileName, funcName, std::this_thread::get_id());
    item.size = n;
}
void LogLite::KeepFileCount() const
{
    std::set<std::string> ls;
    boost::system::error_code e;
    fs::directory_iterator end;
    for(fs::directory_iterator it(fs::path(m_path), e); it != end; ++it)
    {
        if(fs::is_regular_file(*it, e))
        {
            ls.insert(it->path().string());
        }
    }
    if(ls.size() > MAX_FILE_COUNT)
    {
        size_t n = ls.size() - MAX_FILE_COUNT;
        while(n--)
        {
            std::set<std::string>::iterator it = ls.begin();
            const std::string& s = *it;
            fs::remove(s, e);
            ls.erase(it);
        }
    }
}
void LogLite::WriteThreadHandler()
{
    assert(m_file != NULL);
    while(!m_stop)
    {
        std::vector<struct Item> items;
        {
            std::unique_lock<std::mutex> lock(m_mutex);
            m_cv.wait_for(lock, std::chrono::milliseconds(FLUSH_MILLISEC), [&]()
            {
                return m_stop;
            });
            if(m_stop)
                break;
            m_items.swap(items);
        }
        for(const struct Item& item: items)
        {
            fwrite(item.text, item.size, 1, m_file);
        }
        fflush(m_file); //多次写入后再刷新至硬盘
        if(ftell(m_file) >= MAX_FILE_SIZE)
        {
            CreateLogFile();
        }
        KeepFileCount();
    }
    assert(m_file != NULL);
    fclose(m_file);
}

//循环向a函数每次发送200个字节长度（这个是固定的）的buffer,
//a函数中需要将循环传进来的buffer，组成240字节（也是固定的）的新buffer进行处理，
//在处理的时候每次从新buffer中取两个字节打印
#ifdef _MSC_VER
    #pragma warning(disable:4996)
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
    #include <windows.h>
    #include <process.h>
    #include <io.h>
    #define  MYVOID             void
    #define  vsnprintf          _vsnprintf
#else
    #include <unistd.h>
    #include <sys/time.h>
    #include <pthread.h>
    #define  CRITICAL_SECTION   pthread_mutex_t
    #define  MYVOID             void *
#endif
//Log{
#define MAXLOGSIZE 20000000
#define MAXLINSIZE 16000
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char logfilename1[]="MyLog1.log";
char logfilename2[]="MyLog2.log";
static char logstr[MAXLINSIZE+1];
char datestr[16];
char timestr[16];
char mss[4];
CRITICAL_SECTION cs_log;
FILE *flog;
#ifdef _MSC_VER
void Lock(CRITICAL_SECTION *l) {
    EnterCriticalSection(l);
}
void Unlock(CRITICAL_SECTION *l) {
    LeaveCriticalSection(l);
}
void sleep_ms(int ms) {
    Sleep(ms);
}
#else
void Lock(CRITICAL_SECTION *l) {
    pthread_mutex_lock(l);
}
void Unlock(CRITICAL_SECTION *l) {
    pthread_mutex_unlock(l);
}
void sleep_ms(int ms) {
    usleep(ms*1000);
}
#endif
void LogV(const char *pszFmt,va_list argp) {
    struct tm *now;
    struct timeb tb;
    if (NULL==pszFmt||0==pszFmt[0]) return;
    vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);
    ftime(&tb);
    now=localtime(&tb.time);
    sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);
    sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );
    sprintf(mss,"%03d",tb.millitm);
    printf("%s %s.%s %s",datestr,timestr,mss,logstr);
    flog=fopen(logfilename1,"a");
    if (NULL!=flog) {
        fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);
        if (ftell(flog)>MAXLOGSIZE) {
            fclose(flog);
            if (rename(logfilename1,logfilename2)) {
                remove(logfilename2);
                rename(logfilename1,logfilename2);
            }
        } else {
            fclose(flog);
        }
    }
}
void Log(const char *pszFmt,...) {
    va_list argp;
    Lock(&cs_log);
    va_start(argp,pszFmt);
    LogV(pszFmt,argp);
    va_end(argp);
    Unlock(&cs_log);
}
//Log}
#define ASIZE    200
#define BSIZE    240
#define CSIZE      2
char Abuf[ASIZE];
char Cbuf[CSIZE];
CRITICAL_SECTION cs_HEX ;
CRITICAL_SECTION cs_BBB ;
struct FIFO_BUFFER {
    int  head;
    int  tail;
    int  size;
    char data[BSIZE];
} BBB;
int No_Loop=0;
void HexDump(int cn,char *buf,int len) {
    int i,j,k;
    char binstr[80];
    Lock(&cs_HEX);
    for (i=0;i<len;i++) {
        if (0==(i%16)) {
            sprintf(binstr,"%03d %04x -",cn,i);
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        } else if (15==(i%16)) {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
            sprintf(binstr,"%s  ",binstr);
            for (j=i-15;j<=i;j++) {
                sprintf(binstr,"%s%c",binstr,("!"<buf[j]&&buf[j]<="~")?buf[j]:".");
            }
            Log("%s\n",binstr);
        } else {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        }
    }
    if (0!=(i%16)) {
        k=16-(i%16);
        for (j=0;j<k;j++) {
            sprintf(binstr,"%s   ",binstr);
        }
        sprintf(binstr,"%s  ",binstr);
        k=16-k;
        for (j=i-k;j<i;j++) {
            sprintf(binstr,"%s%c",binstr,("!"<buf[j]&&buf[j]<="~")?buf[j]:".");
        }
        Log("%s\n",binstr);
    }
    Unlock(&cs_HEX);
}
int GetFromRBuf(int cn,CRITICAL_SECTION *cs,struct FIFO_BUFFER *fbuf,char *buf,int len) {
    int lent,len1,len2;
    lent=0;
    Lock(cs);
    if (fbuf->size>=len) {
        lent=len;
        if (fbuf->head+lent>BSIZE) {
            len1=BSIZE-fbuf->head;
            memcpy(buf     ,fbuf->data+fbuf->head,len1);
            len2=lent-len1;
            memcpy(buf+len1,fbuf->data           ,len2);
            fbuf->head=len2;
        } else {
            memcpy(buf     ,fbuf->data+fbuf->head,lent);
            fbuf->head+=lent;
        }
        fbuf->size-=lent;
    }
    Unlock(cs);
    return lent;
}
MYVOID thdB(void *pcn) {
    char        *recv_buf;
    int          recv_nbytes;
    int          cn;
    int          wc;
    int          pb;
    cn=(int)pcn;
    Log("%03d thdB              thread begin...\n",cn);
    while (1) {
        sleep_ms(10);
        recv_buf=(char *)Cbuf;
        recv_nbytes=CSIZE;
        wc=0;
        while (1) {
            pb=GetFromRBuf(cn,&cs_BBB,&BBB,recv_buf,recv_nbytes);
            if (pb) {
                Log("%03d recv %d bytes\n",cn,pb);
                HexDump(cn,recv_buf,pb);
                sleep_ms(1);
            } else {
                sleep_ms(1000);
            }
            if (No_Loop) break;//
            wc++;
            if (wc>3600) Log("%03d %d==wc>3600!\n",cn,wc);
        }
        if (No_Loop) break;//
    }
#ifndef _MSC_VER
    pthread_exit(NULL);
#endif
}
int PutToRBuf(int cn,CRITICAL_SECTION *cs,struct FIFO_BUFFER *fbuf,char *buf,int len) {
    int lent,len1,len2;
    Lock(cs);
    lent=len;
    if (fbuf->size+lent>BSIZE) {
        lent=BSIZE-fbuf->size;
    }
    if (fbuf->tail+lent>BSIZE) {
        len1=BSIZE-fbuf->tail;
        memcpy(fbuf->data+fbuf->tail,buf     ,len1);
        len2=lent-len1;
        memcpy(fbuf->data           ,buf+len1,len2);
        fbuf->tail=len2;
    } else {
        memcpy(fbuf->data+fbuf->tail,buf     ,lent);
        fbuf->tail+=lent;
    }
    fbuf->size+=lent;
    Unlock(cs);
    return lent;
}
MYVOID thdA(void *pcn) {
    char        *send_buf;
    int          send_nbytes;
    int          cn;
    int          wc;
    int           a;
    int          pa;
    cn=(int)pcn;
    Log("%03d thdA              thread begin...\n",cn);
    a=0;
    while (1) {
        sleep_ms(100);
        memset(Abuf,a,ASIZE);
        a=(a+1)%256;
        if (16==a) {No_Loop=1;break;}//去掉这句可以让程序一直循环直到按Ctrl+C或Ctrl+Break或当前目录下存在文件No_Loop
        send_buf=(char *)Abuf;
        send_nbytes=ASIZE;
        Log("%03d sending %d bytes\n",cn,send_nbytes);
        HexDump(cn,send_buf,send_nbytes);
        wc=0;
        while (1) {
            pa=PutToRBuf(cn,&cs_BBB,&BBB,send_buf,send_nbytes);
            Log("%03d sent %d bytes\n",cn,pa);
            HexDump(cn,send_buf,pa);
            send_buf+=pa;
            send_nbytes-=pa;
            if (send_nbytes<=0) break;//
            sleep_ms(1000);
            if (No_Loop) break;//
            wc++;
            if (wc>3600) Log("%03d %d==wc>3600!\n",cn,wc);
        }
        if (No_Loop) break;//
    }
#ifndef _MSC_VER
    pthread_exit(NULL);
#endif
}
int main() {
#ifdef _MSC_VER
    InitializeCriticalSection(&cs_log);
    InitializeCriticalSection(&cs_HEX );
    InitializeCriticalSection(&cs_BBB );
#else
    pthread_t threads[2];
    int threadsN;
    int rc;
    pthread_mutex_init(&cs_log,NULL);
    pthread_mutex_init(&cs_HEX,NULL);
    pthread_mutex_init(&cs_BBB,NULL);
#endif
    Log("Start===========================================================\n");
    BBB.head=0;
    BBB.tail=0;
    BBB.size=0;
#ifdef _MSC_VER
    _beginthread((void(__cdecl *)(void *))thdA,0,(void *)1);
    _beginthread((void(__cdecl *)(void *))thdB,0,(void *)2);
#else
    threadsN=0;
    rc=pthread_create(&(threads[threadsN++]),NULL,thdA,(void *)1);if (rc) Log("%d=pthread_create %d error!\n",rc,threadsN-1);
    rc=pthread_create(&(threads[threadsN++]),NULL,thdB,(void *)2);if (rc) Log("%d=pthread_create %d error!\n",rc,threadsN-1);
#endif
    if (!access("No_Loop",0)) {
        remove("No_Loop");
        if (!access("No_Loop",0)) {
            No_Loop=1;
        }
    }
    while (1) {
        sleep_ms(1000);
        if (No_Loop) break;//
        if (!access("No_Loop",0)) {
            No_Loop=1;
        }
    }
    sleep_ms(3000);
    Log("End=============================================================\n");
#ifdef _MSC_VER
    DeleteCriticalSection(&cs_BBB );
    DeleteCriticalSection(&cs_HEX );
    DeleteCriticalSection(&cs_log);
#else
    pthread_mutex_destroy(&cs_BBB);
    pthread_mutex_destroy(&cs_HEX);
    pthread_mutex_destroy(&cs_log);
#endif
    return 0;
}

#pragma once  
#include <Windows.h>  
#include <stdio.h>
#include <time.h>  
#include <sys/timeb.h>
#define LOG_DEBUG     1
#define LOG_WARING    2
#define LOG_ERROR     3
#define CURRENT_LEVEL LOG_DEBUG
#define ADD_LOG(fmt, ...) CLog::GetInstance()->AddLog(fmt,__FILE__,__LINE__,CURRENT_LEVEL)
class  CLog  
{  
public:   
	static CLog* GetInstance();  
public:  
	// 添加日志  
	int AddLog(char* pszLogTxt,char* FileName = __FILE__,int nLine = __LINE__,int log_level = LOG_DEBUG);  
	// 设置日志文件存放路径  
	void SetLogPath(const char* szLogPath);  
	// 清空日志文件  
	int ClearLog();  
protected:  
	char m_szLogPath[MAX_PATH];  
// 	char m_szLogPath_Tmp[MAX_PATH]; 
	FILE* m_pLogFile;  
	struct tm   m_current_time;
	// 构造线程安全类  
	CRITICAL_SECTION m_cs;  
private:  
	CLog();  
	~CLog();  
	static CLog* m_pLog;  
};  
class CAutoLog
{
public:
	CAutoLog(char* pszLogTxt,int log_level = LOG_DEBUG)
	{
		int nLen = strlen(pszLogTxt);
		char* pBuf = new char[nLen+10];
		memcpy(pBuf,pszLogTxt,nLen);
		memcpy(pBuf+nLen,"===Begin",9);
		ADD_LOG(pBuf);
		delete[] pBuf;
		m_LogTxt = pszLogTxt;
	}
	~CAutoLog()
	{
		int nLen = strlen(m_LogTxt);
		char* pBuf = new char[nLen+10];
		memcpy(pBuf,m_LogTxt,nLen);
		memcpy(pBuf+nLen,"===END",7);
		CLog::GetInstance()->AddLog(pBuf);
		delete[] pBuf;
	}
private:
	char* m_LogTxt;
};

///源文件

#include "Log.h"  
#include <string>
using namespace std;
CLog* CLog::m_pLog = NULL;  
// This is the constructor of a class that has been exported.  
// see Log.h for the class definition  
CLog::CLog()  
{  
	// 默认放在程序运行目录下  
	char szConfigPath[MAX_PATH]={0};  
	//获取EXE全路径  
	char szExePath[MAX_PATH]={0};  
	GetModuleFileNameA( NULL, (LPCH)szExePath, MAX_PATH );  
	char *tmp=szExePath;  
	while(strchr(tmp,"\") != NULL)     //截取全路径名  
	{   
		tmp = strchr(tmp,"\") + 1;   
	}  
	szExePath[strlen(szExePath) - strlen(tmp)] = "\0";  
// 	sprintf_s( m_szLogPath,"%srun.log", szExePath );  
	m_pLogFile = NULL; 
	InitializeCriticalSection(&m_cs);  

	struct timeb tp;
	struct tm *tm;
	ftime(&tp);
	tm = localtime(&tp.time);
	m_current_time = *tm;
// 	time_t t = time(0);   
	char szTime[MAX_PATH];  
 	CreateDirectoryA( "Log",   NULL);
	sprintf_s(m_szLogPath ,"%slog\%.4d_%.2d_%.2d.log",szExePath,1900+tm->tm_year, 1 + tm->tm_mon,tm->tm_mday);//sizeof("d:\8.0平台_01_01.log")
	//	EnterCriticalSection(&m_cs);  
	m_pLogFile = fopen(m_szLogPath, "a+");  
}  
CLog::~CLog()  
{  
	fclose(m_pLogFile);
	if(m_pLog)  
	{  
		delete m_pLog;  
		m_pLog = NULL;  
	}  
};  
int CLog::AddLog( char* pszLogTxt,char* FileName /*= __FILE__*/,int nLine /*= __LINE__*/ ,int log_level /*= LOG_DEBUG*/)
{  
	if (log_level<CURRENT_LEVEL)
	{
		return 1;
	}
	struct timeb tp;
	struct tm *tm;
	ftime(&tp);
	tm = localtime(&tp.time);
//	time_t t = time(0);   
 	char szTime[MAX_PATH];  
	sprintf_s(szTime, "%.4d-%.2d-%.2d %.2d:%.2d:%.2d.%.3d",
		1900+ tm->tm_year,
		1 + tm->tm_mon,
		tm->tm_mday,
		tm->tm_hour,
		tm->tm_min,
		tm->tm_sec,
		tp.millitm);
// 	CreateDirectory( "d:\Log ",   NULL);
// 	sprintf_s(m_szLogPath_Tmp ,"d:\log\8.0平台_%.2d_%.2d.log",1 + tm->tm_mon,tm->tm_mday);//sizeof("d:\8.0平台_01_01.log")
//	EnterCriticalSection(&m_cs); 
	if ((m_current_time.tm_mday!=tm->tm_mday)||
		(m_current_time.tm_mon!=tm->tm_mon))
	{
		EnterCriticalSection(&m_cs);
		fclose(m_pLogFile); 
		char szExePath[MAX_PATH]={0};  
		GetModuleFileNameA( NULL, (LPCH)szExePath, MAX_PATH );  
		char *tmp=szExePath;  
		while(strchr(tmp,"\") != NULL)     //截取全路径名  
		{   
			tmp = strchr(tmp,"\") + 1;   
		}  
		szExePath[strlen(szExePath) - strlen(tmp)] = "\0";  
// 		sprintf_s(m_szLogPath ,"%slog\_%.2d_%.2d.log",szExePath,1 + tm->tm_mon,tm->tm_mday);
		sprintf_s(m_szLogPath ,"%slog\%.4d_%.2d_%.2d.log",szExePath,1900+tm->tm_year, 1 + tm->tm_mon,tm->tm_mday);
// 		strcpy_s(m_szLogPath,m_szLogPath_Tmp);
		m_pLogFile = fopen(m_szLogPath, "a+");
		LeaveCriticalSection(&m_cs);  
	}
	if (m_pLogFile == 0)
	{
		return -1;
	}
	string strFile = FileName;
	strFile = strFile.substr(strFile.find_last_of("\")+1,strFile.length());
	int nLen = fprintf(m_pLogFile, "%s:%d [%s]: %s\n",strFile.c_str(),nLine, szTime, pszLogTxt);  
	fflush(m_pLogFile);
//	fclose(m_pLogFile);  
//	LeaveCriticalSection(&m_cs);  
	return 0;  
}  
void CLog::SetLogPath(const char* szLogPath)  
{  
	char buffP[100] ={0};
	sprintf_s(buffP,"%s\log",szLogPath);
	CreateDirectoryA(buffP,NULL);
	fclose(m_pLogFile); 
	struct timeb tp;
	struct tm *tm;
	ftime(&tp);
	tm = localtime(&tp.time);
	m_current_time = *tm;
	// 	time_t t = time(0);   
	char szTime[MAX_PATH]; 
	strcpy_s(m_szLogPath, szLogPath);
// 	CreateDirectoryA( "Log",   NULL);
	sprintf_s(m_szLogPath ,"%slog\%.4d_%.2d_%.2d.log",m_szLogPath,1900+tm->tm_year, 1 + tm->tm_mon,tm->tm_mday);//sizeof("d:\8.0平台_01_01.log")
	//	EnterCriticalSection(&m_cs);  
	m_pLogFile = fopen(m_szLogPath, "a+"); 
}  
int CLog::ClearLog()  
{  
	EnterCriticalSection(&m_cs);  
	m_pLogFile = fopen(m_szLogPath, "w");  
	fclose(m_pLogFile);  
	LeaveCriticalSection(&m_cs);  
	return 0;  
}  
CLog* CLog::GetInstance()  
{  
	if(NULL == m_pLog)  
	{  
		m_pLog = new CLog;  
	}  
	return m_pLog;  
}