VB6-AppendToLog 通过API写入日志

工作中免不了需要为自己的程序添加日志，我也从网上扒拉了一个老外写的模块，修改修改了下，凑合用吧。

 Option Explicit
 '**************************************
 ' 模块名称: AppendToLog 通过API写入日志
 '**************************************
 'API 声明
 Private Const GENERIC_WRITE = &H40000000
 Private Const FILE_SHARE_READ = &H1
 Private Const Create_NEW =
 Private Const OPEN_EXISTING =
 Private Const FILE_ATTRIBUTE_NORMAL = &H80
 Private Const FILE_BEGIN =
 Private Const INVALID_HANDLE_VALUE = -
 Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, ByVal lpSecurityAttributes As Any, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
 Private Declare Function SetFilePointer Lib "kernel32" (ByVal hFile As Long, ByVal lDistanceToMove As Long, lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long
 Private Declare Function WriteFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, ByVal lpOverlapped As Any) As Long
 Private Declare Function FlushFileBuffers Lib "kernel32" (ByVal hFile As Long) As Long
 Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

 '调用：Call AppendToLog("测试模块名","测试日志内容")
 '**************************************
 ' 方法名称: AppendToLog
 ' 输入参数:sMdl 模块名称 sMessage 日志内容
 '**************************************
 Public Sub AppendToLog(sMdl As String, sMessage As String)

 On Error GoTo Err:

     '获取计算机名、用户名、本机ip
     Dim LocalInfo As String
     Dim strLocalIP As String
     Dim winIP As Object
     LocalInfo = LocalInfo & "  Computer:" & Environ("computername")
     LocalInfo = LocalInfo & "  User:" & Environ("username")
     Set winIP = CreateObject("MSWinsock.Winsock")
     strLocalIP = winIP.LocalIP
     LocalInfo = LocalInfo & "  IP:" & strLocalIP

     Dim lpFileName As String
     lpFileName = App.Path + "\Log"
     If Dir(lpFileName, vbDirectory) = "" Then
         MkDir (lpFileName)
     End If

     lpFileName = lpFileName + "\" + Format(Now, "yyyymmdd") + ".log"

     sMessage = "--" + Format(Now, "yyyy-mm-dd hh:mm:ss") + "  模块:" + sMdl + LocalInfo + vbNewLine + sMessage + vbNewLine
     'appends a string to a text file.
     'it's up to the coder to add a CR/LF at the end
     'of the string if (s)he so desires.
     'assume failure
     'AppendToLog = False
     'exit if the string cannot be written to disk
     If Len(sMessage) <  Then Exit Sub
     'get the size of the file (if it exists)
     Dim fLen As Long: fLen =
     If (Len(Dir(lpFileName))) Then: fLen = FileLen(lpFileName)
     'open the log file, create as necessary
     Dim hLogFile As Long
     hLogFile = CreateFile(lpFileName, GENERIC_WRITE, FILE_SHARE_READ, ByVal &, _
         IIf(Len(Dir(lpFileName)), OPEN_EXISTING, Create_NEW), _
         FILE_ATTRIBUTE_NORMAL, &)
     'ensure the log file was opened properly
     If (hLogFile = INVALID_HANDLE_VALUE) Then Exit Sub
     'move file pointer to end of file if file was not created
     If (fLen <> ) Then
         If (SetFilePointer(hLogFile, fLen, ByVal &, FILE_BEGIN) = &HFFFFFFFF) Then
             'exit sub if the pointer did not set correctly
             CloseHandle (hLogFile)
             Exit Sub
         End If
     End If
     'convert the source string to a byte array for use with WriteFile
     Dim lTemp As Long
     ReDim TempArray( To Len(sMessage) - ) As Byte
     TempArray = StrConv(sMessage, vbFromUnicode)
     lTemp = UBound(TempArray) +
     'write the string to the log file
     If (WriteFile(hLogFile, TempArray(), lTemp, lTemp, ByVal &) <> ) Then
         'the data was written correctly
         'AppendToLog = True
     End If
     'flush buffers and close the file
     FlushFileBuffers (hLogFile)
     CloseHandle (hLogFile)
     Exit Sub
 Err:
     MsgBox "日志写入出错，原因是" + Err.Description, vbExclamation, "提示信息"

 End Sub