写日志类 vs2010 日志文件按月，每月写一个日志文件

逃离我推掉我的手 2022-02-09 09:39 249阅读 0赞

#pragma once
    class LogFile
    {
    protected:
        CRITICAL_SECTION _csLock;
        char * _szFileName;
        HANDLE _hFile;
        bool OpenFile();//打开文件， 指针到文件尾
        DWORD Write(LPCVOID lpBuffer, DWORD dwLength);
        virtual void WriteLog( LPCVOID lpBuffer, DWORD dwLength);//写日志, 可以扩展修改
        void Lock()  {::EnterCriticalSection(&_csLock); }
        void Unlock() {::LeaveCriticalSection(&_csLock);} 
        char szFileSuffix[32]; //文件后缀
    public:
        LogFile(char*szFileName);
        virtual ~LogFile();
        const char * GetFileName()
        {
            return _szFileName;
        }
    
        void SetFileName(const char *szName);//修改文件名， 同时关闭上一个日志文件
        bool IsOpen()
        {
            return _hFile != INVALID_HANDLE_VALUE;
        }
    
        void Close();
        void Log(LPCVOID lpBuffer, DWORD dwLength);//追加日志内容
        void Log(const char *szText){
            Log(szText, strlen(szText));}
        void Log(CString str);
        void Log(TCHAR *buffer);
    private://屏蔽函数
        LogFile(const LogFile&);
        LogFile&operator = (const LogFile&);
    };

![复制代码][copycode.gif]

#include "StdAfx.h"
    #include "LogFile.h"
    
    
    
    LogFile::LogFile(char*szFileNameParam)
    {
        memset(szFileSuffix,0,sizeof(szFileSuffix));
        strcat_s(szFileSuffix,szFileNameParam);  //文件后辍，不带日期
        _szFileName = NULL;
        _hFile = INVALID_HANDLE_VALUE;
        ::InitializeCriticalSection(&_csLock);
    
        //求出当前日期
        time_t now;
        time(&now);
        char szCurDate[256] = {
         0};
        struct tm newtime;
        localtime_s(&newtime,&now);
        strftime(szCurDate,19,"%Y%m",&newtime);
    
        char szFileName[64] = {
         0};
        strcat_s(szFileName,10,szCurDate); //日期在前面
        strcat_s(szFileName,szFileSuffix);  //追加文件名
        SetFileName(szFileName);
    }
    
    //-------------------------------------------------------------------------
    LogFile::~LogFile()
    {
        ::DeleteCriticalSection(&_csLock);
        Close();
        if(_szFileName)
            delete [] _szFileName;
    }
    //-------------------------------------------------------------------------
    bool LogFile::OpenFile()
    {
        if(IsOpen())
            return true;
        if(!_szFileName)
            return false;
    
        _hFile = CreateFileA(
            _szFileName,
            GENERIC_WRITE,
            FILE_SHARE_READ | FILE_SHARE_WRITE,
            NULL,
            OPEN_EXISTING,
            FILE_ATTRIBUTE_NORMAL,
            NULL);
    
        if(!IsOpen() && GetLastError() == 2)//打开不成功， 且因为文件不存在， 创建文件
            _hFile = CreateFileA(
            _szFileName,
            GENERIC_WRITE,
            FILE_SHARE_READ | FILE_SHARE_WRITE,
            NULL,
            OPEN_ALWAYS,
            FILE_ATTRIBUTE_NORMAL,
            NULL);
    
        if(IsOpen())
            SetFilePointer(_hFile, 0, NULL, FILE_END);
        return IsOpen();
    }
    //-------------------------------------------------------------------------
    DWORD LogFile::Write(LPCVOID lpBuffer, DWORD dwLength)
    {
        DWORD dwWriteLength = 0;
        if(IsOpen())
            WriteFile(_hFile, lpBuffer, dwLength, &dwWriteLength, NULL);
        return dwWriteLength;
    }
    //-------------------------------------------------------------------------
    void LogFile::WriteLog( LPCVOID lpBuffer, DWORD dwLength)
    {
        DWORD dwWriteLength;
        char buf[1024]={
         0};
        strcat_s(buf,1000,(char*)lpBuffer);
        if(IsOpen())
        {
            time_t now;
            time(&now);
            char temp[1024];
            struct tm newtime;
            localtime_s(&newtime,&now);
            memset(temp,0,sizeof(temp));
            strftime(temp, 64, "%Y-%m-%d %H:%M:%S   :", &newtime);
            strcat_s(temp,128,"   :");
            strcat_s(temp,1024,buf);
            WriteFile(_hFile, temp,strlen(temp), &dwWriteLength, NULL);
            WriteFile(_hFile, "\r\n",2, &dwWriteLength, NULL);
            FlushFileBuffers(_hFile); //存硬盘
    
        }
        else
        {
            ;
        }
    }
    //-------------------------------------------------------------------------
    void LogFile::SetFileName(const char *szName)
    {
        //assert(szName);
    
        if(_szFileName != NULL)
        {
            //AfxMessageBox(_T("_szFileName is NULL"));
            delete []_szFileName;
        }
        Close();
        int len = strlen(szName);
        _szFileName = new char[32];
    //    assert(_szFileName);
        strcpy_s(_szFileName,30,szName);
    }
    //-------------------------------------------------------------------------
    void LogFile::Close()
    {
        if(IsOpen())
        {
            CloseHandle(_hFile);
            _hFile = INVALID_HANDLE_VALUE;
        }
    }
    //-------------------------------------------------------------------------
    void LogFile::Log(LPCVOID lpBuffer, DWORD dwLength)
    {
    //    assert(lpBuffer);
        __try
        {
            Lock();
    
            //算出现在应该写日志的文件名
            time_t now;
            time(&now);
            char szCurDate[256] = {
         0};
            struct tm newtime;
            localtime_s(&newtime,&now);
            strftime(szCurDate,19,"%Y%m",&newtime);
            char szCurFileName[64] = {
         0};
            strcat_s(szCurFileName,10,szCurDate); //日期在前面
            strcat_s(szCurFileName,szFileSuffix);  //追加文件名
            if(!PathFileExistsA(szCurFileName))
                SetFileName(szCurFileName);
    
            if(OpenFile())
                WriteLog(lpBuffer, dwLength);
        }
        __finally
        {
            Unlock();
        }
    }
    
    void LogFile::Log(TCHAR *buffer)
    {
        CT2A buf_str(buffer);
        Log(buf_str);
    }
    void LogFile::Log(CString str)
    {
        Log(str.GetBuffer());
    }

![复制代码][copycode.gif]

出处： [http://www.cnblogs.com/zhangdongsheng/][http_www.cnblogs.com_zhangdongsheng]

作者： [张东升 ][http_www.cnblogs.com_zhangdongsheng]

[copycode.gif]: /images/20220206/054259169924496d81719ba684c1853c.png
[http_www.cnblogs.com_zhangdongsheng]: http://www.cnblogs.com/zhangdongsheng/