博客

特点

1 采用双文件记录日志信息

2 当一个文件写满后,清空另外一个文件继续写入

3 可设置最大日志文件大小

4 文本文件使用unicode进行编码

#define DEFAULT_STR_BUFF_LEN 2048<br /> class DoubleLog<br /> {<br /> public:</p> <p> DoubleLog(void);<br /> ~DoubleLog(void);<br /> bool Init(const string& logFileName);<br /> void SetMaxBytes(int nbyte);<br /> //void Close(void);</p> <p> bool WriteLog(LPCWSTR lpszFormat,…);</p> <p>private:<br /> static char lineEnd[4];<br /> static char newufile[2];<br /> static bool bclog;<br /> fstream fs;<br /> string filename1;<br /> string filename2;<br /> int maxLength;<br /> //bool isOpen;</p> <p> wchar_t szMsg[DEFAULT_STR_BUFF_LEN];</p> <p> //streampos curFilePos;<br /> bool bfile1;<br /> bool WriteFileHead();<br /> void ChangePoint();<br /> bool OpenFile();<br /> bool CheckFStream();<br /> bool OpenNewFile();</p> <p>};</p> <p>LPWSTR getNowTimeW(LPWSTR pbuff)<br /> {</p> <p> SYSTEMTIME cSystime;<br /> GetLocalTime(&cSystime);<br /> //wchar_t pbuff[24] = {0};<br /> swprintf_s(pbuff, 20, L”%04d-%02d-%02d %02d:%02d:%02d”, cSystime.wYear, cSystime.wMonth, cSystime.wDay, cSystime.wHour, cSystime.wMinute, cSystime.wSecond);<br /> //return wstring(pbuff);<br /> return pbuff;</p> <p>}</p> <p>#include <strsafe.h><br /> #define DEFAULT_MAX_BUFF_LEN (1024*1024)</p> <p>char DoubleLog::lineEnd[4] = {0x0d,0x00,0x0a,0x00};<br /> char DoubleLog::newufile[2] = {0xff,0xfe};<br /> bool DoubleLog::bclog = false;</p> <p>DoubleLog::DoubleLog(void)<br /> : maxLength(DEFAULT_MAX_BUFF_LEN)<br /> {<br /> if (!bclog)<br /> {<br /> CreateDirectory(L”log”,NULL);<br /> bclog = true;<br /> }</p> <p> bfile1 = true;<br /> }</p> <p>DoubleLog::~DoubleLog(void)<br /> {</p> <p>}</p> <p>int GetFstreamLen(fstream& infile)<br /> {<br /> streampos cp = infile.tellg();<br /> infile.seekg( 0, ios_base::end );<br /> streampos len = infile.tellg();<br /> infile.seekg( 0, cp );<br /> return len;<br /> }</p> <p>bool DoubleLog::WriteFileHead()<br /> {<br /> fs.write(newufile,2);<br /> return true;<br /> }</p> <p>void DoubleLog::ChangePoint()<br /> {<br /> bfile1 = !bfile1;</p> <p>}<br /> bool DoubleLog::OpenFile()<br /> {<br /> string fname;<br /> if (bfile1)<br /> {<br /> fname = filename1;<br /> }<br /> else<br /> {<br /> fname = filename2;<br /> }<br /> if (fs.is_open())<br /> {<br /> fs.close();<br /> }<br /> fs.open(fname.c_str(),ios_base::app | ios_base::out | ios_base::binary);</p> <p> if (! fs.is_open())<br /> {</p> <p> return false;<br /> }<br /> return true;</p> <p>}</p> <p>bool DoubleLog::OpenNewFile()<br /> {<br /> string fname;<br /> if (bfile1)<br /> {<br /> fname = filename1;<br /> }<br /> else<br /> {<br /> fname = filename2;<br /> }<br /> if (fs.is_open())<br /> {<br /> fs.close();<br /> }<br /> fs.open(fname.c_str(), ios::trunc | ios_base::out | ios_base::binary);</p> <p> if (! fs.is_open())<br /> {<br /> return false;<br /> }</p> <p> WriteFileHead();</p> <p> return true;</p> <p>}</p> <p>bool DoubleLog::CheckFStream()<br /> {<br /> if (!fs.is_open())<br /> {<br /> return false;<br /> }</p> <p> WriteFileHead();</p> <p> streampos curpos = fs.tellp();</p> <p> streampos zp = 2;<br /> if (curpos == zp)<br /> {</p> <p> return true;<br /> }</p> <p> if (curpos >= maxLength)<br /> {</p> <p> return false;<br /> }</p> <p> return true;</p> <p>}</p> <p>bool DoubleLog::Init(const string& logFileName)<br /> {<br /> string curD(“log/”);<br /> filename1 = curD + logFileName + “.txt”;<br /> filename2 = curD +logFileName + “_2.txt”;</p> <p> OpenFile();</p> <p> if (!CheckFStream())<br /> {<br /> fs.close();<br /> ChangePoint();<br /> OpenFile();<br /> CheckFStream();</p> <p> }</p> <p> return true;<br /> }</p> <p>bool DoubleLog::WriteLog(LPCWSTR lpszFormat,…)<br /> {</p> <p> va_list argList;<br /> va_start(argList, lpszFormat);</p> <p> HRESULT hr;<br /> hr = StringCchVPrintfW(szMsg,DEFAULT_STR_BUFF_LEN,lpszFormat,argList);<br /> if (hr == S_OK || hr == STRSAFE_E_INSUFFICIENT_BUFFER)<br /> {<br /> szMsg[DEFAULT_STR_BUFF_LEN – 1]=0;<br /> }<br /> va_end(argList);</p> <p> wchar_t szfbuff[24] = {0};</p> <p> getNowTimeW(szfbuff);</p> <p> szfbuff[wcslen(szfbuff)] = L’ ‘;<br /> szfbuff[wcslen(szfbuff)] = 0;</p> <p> fs.write((char*)szfbuff, wcslen(szfbuff) * 2);</p> <p> fs.write((char*)szMsg, wcslen(szMsg) * 2);</p> <p> fs.write(lineEnd,4);</p> <p> fs.flush();<br /> streampos curpos = fs.tellp();</p> <p> if (curpos >= maxLength || !(fs.good()))<br /> {<br /> fs.close();<br /> ChangePoint();</p> <p> OpenNewFile();</p> <p> }</p> <p> return true;</p> <p>}</p> <p>void DoubleLog::SetMaxBytes(int nbyte)<br /> {<br /> if (nbyte<512 || nbyte > 500*1024*1024)<br /> {<br /> return;<br /> }<br /> maxLength = nbyte;<br /> }<br />