VB script to scan latest log file for errors - vbscript

Question

I have a VB script which scans the mentioned log file for errors and sends a notification through an email.
How can I scan the latest log file in the folder? For example, Filename1.070615 (Filename1.mmddyy) is a log file. After a certain size, the logfile switches to new file with the same name but different date: Filename1.070615.
cdoSendUsingPort = 2, _
Const ForReading = 1
Dim intStartAtLine, strFileCreateddate, i, strResults, strTextToScanFor, bStartFromScratch
Dim strLastCheckedFor, strArrayToString, strSubject, strMailFrom, strMailTo
strMailto = "<Emailaddress>"
strMailFrom = "<FromAddress>"
strSubject = "Log scanner"
strSMTPServer = "x.x.x.x"
FileToRead = "D:\LOG\filename1.mmddyy"
arrTextToScanFor = Array("error","another thing")
Set WshShell = WScript.CreateObject("WScript.Shell")
searchkey = replace(replace(filetoread,":",""),"\","_")
On Error Resume Next
strLastFileCheckedCreateDate = WshShell.RegRead("HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\CreateDate")
strLastFileLastLineChecked = WshShell.RegRead("HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\LastLineChecked")
strLastCheckedFor = WshSHell.RegRead("HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\CheckForString")
iLastCheckedLine = WshSHell.RegRead("HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\LastLineChecked")
On Error GoTo 0
Set objFSO = WScript.CreateObject("Scripting.FileSystemObject")
Set varFile = objFSO.GetFile(FileToRead)
arrLastCheckedForText = split(strLastCheckedFor,",")
strFileCreateDate = varfile.datecreated
strFileModifiedDate = varfile.datelastmodified
sStatus = "<li>Using mail server: " & strSMTPServer & "</li><li>Running from: " & wscript.scriptfullname & "</li>"
Set objTextFile = objFSO.OpenTextFile(FileToRead, ForReading)
objTextFile.ReadAll
iLineCount = objTextFile.Line
objTextFile.close
If strLastCheckedFor = "" Then
bStartFromScratch = true
sStatus = sStatus & "<li>First run of script against string search</li>" & vbcrlf
ElseIf ubound(arrTextToScanFor) <> ubound(arrLastCheckedForText) Then
bStartFromScratch = true
sStatus = sStatus & "<li>Count of string search criteria has changed</li>" & vbcrlf
Else
For each strItem in arrTextToScanFor
Else
bStartFromScratch = true
'MsgBox strResults
End If
If bStartFromScratch = true Then
sStatus = sStatus & "<li>String search criteria does not match prior search</li>" & vbcrlf
End If
Next
End If
If cint(iLineCount) < cint(iLastCheckedLine) Then
bStartFromScratch = true
sStatus = sStatus & "<li>Last line checked (" & iLastCheckedLine & ") is greater than total line count (" & iLineCount & ") in file</li>"
End If
If CStr(strFileCreateDate) = CStr(strLastFileCheckedCreateDate) and bStartFromScratch <> true Then
intStartAtLine = strLastFileLastLineChecked
If bStartFromScratch <> true then
sStatus = sStatus & "<li>Continuing search from line " & intStartAtLine & "</li>" & vbcrlf
End If
ElseIf strFileCreateDate <> strLastFileCheckedCreateDate or bStartFromScratch = true Then
intStartAtLine = 0
If bStartFromScratch <> true then
sStatus = sStatus & "<li>File created date has changed, starting search from line 0</li>" & vbcrlf
End If
End If
i = 0
Dim strNextLine
For each strItem in arrTextToScanFor
strArrayToString = strArrayToString & delim & strItem
delim = ","
Next
Set objTextFile = objFSO.OpenTextFile(FileToRead, ForReading)
Do While objTextFile.AtEndOfStream <> True
If i < CInt(intStartAtLine) Then
objTextFile.skipline
Else
'MsgBox i
strNextLine = objTextFile.Readline
For each strItem in arrTextToScanFor
If InStr(LCase(strNextLine),LCase(strItem)) Then
strResults = "<span style='font-family:courier-new;color:#696969'><span style='font-weight:bold;background-color:#BEF3F3'>Line " & i & ":</span> " & replace(lcase(strNextLine),lcase(strItem),"<span style='background-color:#FFFF81'>" & strItem & "</span>") & "</span><br>" & vbcrlf & strResults
bSendMail = true
End If
Next
End If
i = i + 1
Loop
objTextFile.close
Set WshShell = CreateObject("WScript.Shell")
'Let's save our settings for next time.
WshShell.RegWrite "HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\FileChecked", FileToRead, "REG_SZ"
WshShell.RegWrite "HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\CreateDate", strFileCreateDate, "REG_SZ"
WshShell.RegWrite "HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\LastLineChecked", i, "REG_SZ"
WshShell.RegWrite "HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\LastScanned", Now, "REG_SZ"
WshShell.RegWrite "HKCU\Software\RDScripts\CheckTXTFile\" & searchkey & "\CheckForString",strArrayToString, "REG_SZ"
set WshShell = nothing
strFileSummary = "<tr><td style='font-family:calibri;font-weight:bold;color:darkblue;width:200px'>File path:</td><td>" & FileToRead & "</td></tr>"
strFileCreateDateSummary = "<tr><td style='font-family:calibri;font-weight:bold;color:darkblue;width:200px'>Created date:</td><td>" & strFileCreateDate & "</td></tr>"
strFileModifiedDateSummary = "<tr><td style='font-family:calibri;font-weight:bold;color:darkblue;width:200px'>Modified date:</td><td>" & strFileModifiedDate & "</td></tr>"
strArraySummary = "<tr><td style='font-family:calibri;font-weight:bold;color:darkblue;width:200px'>Text string(s):</td><td>" & strArrayToString & "</td></tr>"
strFileLineSummary = "<tr><td style='font-family:calibri;font-weight:bold;color:darkblue;width:200px'>Last line checked:</td><td>" & i & "</td></tr>"
strSummary = strFileSummary & strFileCreateDateSummary & strFileModifiedDateSummary & strArraySummary & strFileLineSummary
strBodyContent = "<table style='font-family:calibri;'>" & strSummary & "</table><br><br><span style='font-size:large;'>Entries:</span><br>" & strResults & "<div style='padding-top:30px;font-size:x-small'><br><div style='font-weight:bold;font-family:calibri;color:black;'>Job Details:<ul style='font-weight:normal;font-family:calibri;color:darkgray;'>" & sStatus & "</ul></div></div>"
on error goto 0
'Send the email if need be.
If bSendMail = true Then Call sendmail(strMailFrom,strMailTo,strSubject,strBodyContent)
'------------------------------------------------------------------------
'Function EmailFile - email the warning file
'------------------------------------------------------------------------
Function SendMail(strFrom,strTo,strSubject,strMessage)
Dim iMsg, iConf, Flds
On Error GoTo 0
'// Create the CDO connections.
Set iMsg = CreateObject("CDO.Message")
Set iConf = CreateObject("CDO.Configuration")
Set Flds = iConf.Fields
'// SMTP server configuration.
With Flds
.Item(cdoSendUsingMethod) = cdoSendUsingPort
'// Set the SMTP server address here.
.Item(cdoSMTPServer) = strSMTPServer
.Update
End With
'// Set the message properties.
With iMsg
Set .Configuration = iConf
.To = strMailTo
.From = strMailFrom
.Subject = strSubject
.htmlbody = strMessage
End With
'iMsg.HTMLBody = strMessage
'// Send the message.
iMsg.Send ' send the message.
If CStr(err.number) <> 0 Then
Else
End If
End Function

Answer 1

It would be a bit easier if your log files were named filename1.yymmdd.
Nevertheless, we can use a regex to not only verify the filename but also swap the date components to put them in our desired format!
Set re = New RegExp
re.Pattern = "^(filename1\.)(\d{2})(\d{2})(\d{2})$"
Set fso = CreateObject("Scripting.FileSystemObject")
For Each objFile In fso.GetFolder("d:\log").Files
If re.Test(objFile.Name) Then
strCompareName = re.Replace(objFile.Name, "$1$4$2$3")
If strCompareName > strLatest Then strLatest = strCompareName
End If
Next
' Switch the name back...
strLatest = re.Replace(strLatest, "$1$3$4$2")
WScript.Echo "The latest file is: " & strLatest
This line:
strCompareName = re.Replace(objFile.Name, "$1$4$2$3")
changes the format from mmddyy to yymmdd and saves it in a string for comparison.
Once we've finished our comparisons, we just need to take the latest file we found and reverse the process:
strLatest = re.Replace(strLatest, "$1$3$4$2")
to get the original filename back!