VBScript Error code 800A0409, Unterminated string constant, on line 1 - vbscript

Question

I'm getting Error code 800A0409, Unterminated string constant, on line 1, 54 with the code below.
Option Explicit
Dim ObjProgressMsg
Dim fso,objText,strVstup,strVystup,f,dtmVyt,dtmF,dDiff,fName,fExt,fShort,dtmAkt,tx,msgText
Dim strMessage,strWindowTitle,strTemp,wshShell,objTempMessage,strTempVBS
Set fso = CreateObject("Scripting.FileSystemObject")
Set objText = fso.GetFile("l:\bat\posledni.den")
strVstup = "l:\filefolder\"
strVystup = "l:\backup"
dtmVyt = objText.DateLastModified
msgText = "Some text about copying and renaming" & VbCrLf & "files, please wait..."
ProgressMsg msgText
For Each f In fso.GetFolder(strVstup).Files
dtmF = f.DateLastModified
dDiff = DateDiff("s", dtmF, dtmVyt)
If dDiff < 0 Then
ProgressMsg ""
WScript.Echo f
End If
Next
WScript.Echo "Some text about the task being finished."
Function ProgressMsg( strMessage )
' Written by Denis St-Pierre
' Displays a progress message box that the originating script can kill in both 2k and XP
' If StrMessage is blank, take down previous progress message box
' Using 4096 in Msgbox below makes the progress message float on top of things
' CAVEAT: You must have Dim ObjProgressMsg at the top of your script for this to work as described
Set wshShell = WScript.CreateObject( "WScript.Shell" )
strTEMP = wshShell.ExpandEnvironmentStrings( "%TEMP%" )
If strMessage = "" Then
' Disable Error Checking in case objProgressMsg doesn't exists yet
On Error Resume Next
' Kill ProgressMsg
objProgressMsg.Terminate( )
' Re-enable Error Checking
On Error Goto 0
Exit Function
End If
strTempVBS = strTEMP + "\" & "Message.vbs" 'Control File for reboot
' Create Message.vbs, True=overwrite
Set objTempMessage = fso.CreateTextFile( strTempVBS, True )
objTempMessage.WriteLine( "MsgBox""" & strMessage & """, 4096, """ & "a_sp_rano" & """" )
objTempMessage.Close
' Disable Error Checking in case objProgressMsg doesn't exists yet
On Error Resume Next
' Kills the Previous ProgressMsg
objProgressMsg.Terminate( )
' Re-enable Error Checking
On Error Goto 0
' Trigger objProgressMsg and keep an object on it
Set objProgressMsg = WshShell.Exec( "%windir%\system32\wscript.exe " & strTempVBS )
End Function
The script should show a msgbox while searching for files newer than last modified date of posledni.den file. Then once it finds a file it should close msgbox and echo the file it found.
It works just fine if I change this:
msgText = "Some text about copying and renaming" & VbCrLf & "files, please wait..."
to this:
msgText = "Some text about copying and renaming" & "files, please wait..."
Removal of VbCrLf seems to fix that error, just no line break is obviously happening. I can't figure out why it's behaving like that, what am I doing wrong. Every kind of insight on the problem would be much appreciated.
Thank you in advance. :)

Answer 1

The error occurs in the execution of the generated .vbs. What you do is:
>> msg1 = "A" & vbCrLf & "B"
>> code = "MsgBox """ & msg1 & """"
>> WScript.Echo code
>>
MsgBox "A
B"
>> Execute code
>>
Error Number: 1033
Error Description: Unterminated string constant
What you should do:
>> msg1 = """A"" & vbCrLf & ""B"""
>> WScript.Echo msg1
>>
"A" & vbCrLf & "B"
>> code = "MsgBox " & msg1 & ", 4096"
>> WScript.Echo code
>>
MsgBox "A" & vbCrLf & "B", 4096
>> Execute code
>>
>> <-- no news are good news; message displayed