C++、C#、VB各语言日志代码

一、VB语言，开发工具VB6.0

Private Sub AppendToFile(ByVal fn As String, ByVal msg As String)
    Dim lFileHandle As Long
    lFileHandle = FreeFile
    On Error GoTo Append_Error
    Open fn For Append As #lFileHandle
    Print #lFileHandle, msg
    Close #lFileHandle
    Exit Sub
Append_Error:
End Sub

Private Function WriteLog(ByVal strLog As String)
    Dim strFileName As String    
    strFileName = "C:Log" & VBA.Format(Now, "yyyymmdd") & ".txt"
    Open strFileName For Append As 1
    Write #1, Now & " " & strLog
    Close    
End Function

Public Sub WriteLogFile(ByVal msg As String)
    Dim lFileHandle As Long
    Dim sFile As String
    On Error Resume Next
    sFile = App.Path & "XX.log"
    lFileHandle = FreeFile
    On Error GoTo Append_Error
    Open sFile For Append As #lFileHandle
    Print #lFileHandle, Now & "  " & msg
    Close #lFileHandle
    Exit Sub
Append_Error:
End Sub

--限制大小、天数的日志
Public Sub WriteFileLog(ByVal vValue As String)
    Dim lHandle As Long
    Dim sPath As String
    Dim i As Long
    Dim sFilename As String
    
    On Error Resume Next
    
    lHandle = FreeFile()
    sPath = App.Path & "Log"    
    If Dir(sPath, vbDirectory) = "" Then
        MkDir sPath
    End If    
    '删除超过10天的日志
    For i = -20 To -10
        sFilename = sPath & "XX" & Format(DateAdd("d", i, Date), "YYYYMMDD") & ".log"
        If Dir(sFilename) <> "" Then
            Kill sFilename
        End If
    Next
    sPath = sPath & "XX" & Format(Date, "YYYYMMDD") & ".log"
    
    If Dir(sPath) <> "" Then
        '大于500K，就删除，以免影响性能
        If FileLen(sPath) / 1024 > 500 Then
            Kill sFilename
        End If
    End If
    Open sPath For Append As #lHandle
    Print #lHandle, Format(Now, "YYYY-MM-DD HH:mm:ss") & vbTab & vValue & vbCrLf
    Close #lHandle
End Sub

二、C++语言，开发工具VC6.0

void CNoteCtrl::WriteLog(CString &csInfo)
{
    return ;
    HANDLE hFile = INVALID_HANDLE_VALUE;
    CString cstmp;
    TCHAR *szFileName = _T("c:\XX.log");
    hFile = CreateFile(szFileName,
                    GENERIC_WRITE,
                    FILE_SHARE_WRITE,
                    NULL,
                    OPEN_ALWAYS,
                    FILE_ATTRIBUTE_NORMAL,
                    NULL);
    if(hFile == INVALID_HANDLE_VALUE)
    {
        cstmp.Format("open log file err %d
",GetLastError());
        AfxMessageBox(cstmp);
        return ;
    }
    else
    {
        DWORD dwWriteLen = 0 ;
        SetFilePointer(hFile,0,0,FILE_END);
        if(WriteFile(hFile,csInfo.GetBuffer(csInfo.GetLength()),csInfo.GetLength(),&dwWriteLen,NULL) == 0)
        {
            cstmp.Format("write log file err %d
",GetLastError());
            AfxMessageBox(cstmp);
            CloseHandle(hFile);
            return ;
        }
        CloseHandle(hFile);
    }
}

void CServerThreadPool::WriteLog(LPCTSTR pFormat, ...)
{

        TCHAR chMsg[512];
        chMsg[0] = 0;

        SYSTEMTIME st;
        GetLocalTime(&st);

        TCHAR szBuf[256];
        GetDateFormat(LOCALE_SYSTEM_DEFAULT, LOCALE_USE_CP_ACP, &st, _T("yyyy-MM-dd "), szBuf, 256);
        lstrcat(chMsg, szBuf);
        GetTimeFormat(LOCALE_SYSTEM_DEFAULT, LOCALE_USE_CP_ACP, &st, _T("HH:mm:ss "), szBuf, 256);
        lstrcat(chMsg, szBuf);

        va_list pArg;
        va_start(pArg, pFormat);
        _vstprintf(szBuf, pFormat, pArg);
        va_end(pArg);

        lstrcat(chMsg, szBuf);
        lstrcat(chMsg, _T("
"));
    
        if(GetModuleFileName(NULL, szBuf, 256))
        {
            LPTSTR p = _tcsrchr(szBuf, _T('\'));
            p[1] = 0;
            lstrcat(szBuf, _T("XX.log"));

            HANDLE hFile = CreateFile(szBuf, 
                            GENERIC_WRITE, 
                            FILE_SHARE_WRITE, 
                            NULL, 
                            OPEN_ALWAYS, 
                            FILE_ATTRIBUTE_NORMAL, 
                            NULL);

            if(hFile == INVALID_HANDLE_VALUE)
                return;

            SetFilePointer(hFile, 0, NULL, FILE_END);

            DWORD dwWrite;
            WriteFile(hFile, chMsg, lstrlen(chMsg) * sizeof(TCHAR), &dwWrite, NULL);

            CloseHandle(hFile);
        }    
}

三、C#语言，开发工具VS2010

public void WriteLog(string Contents)
        {
            string strFilePath = AppDomain.CurrentDomain.BaseDirectory + "\XX.log";
            if (!File.Exists(strFilePath))
            {
                File.CreateText(strFilePath).Close();
            }
            File.AppendAllText(strFilePath, DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + ":" + Contents + Environment.NewLine, System.Text.Encoding.Default);
        }

public static void WriteLog(string message)
        {
            string strFilePath = AppDomain.CurrentDomain.BaseDirectory + "\XX.log";
            if (!File.Exists(strFilePath))
            {
                File.CreateText(strFilePath).Close();
            }
            FileStream fs = new FileStream(strFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
            StreamWriter w = new StreamWriter(fs);
            w.BaseStream.Seek(0, SeekOrigin.End);
            w.WriteLine(DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss") + ":" + message);
            w.Flush();
            w.Close();
        }