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Insert data from an application into text file

thesurvivor asked
Last Modified: 2010-04-17
I am trying to work around the fact that I do not have a static IP at home. I'm behind a firewall and to configure Morpheus correctly I need to put the IP my ISP assigns me in the settings. The problem is my address changes about every 5 minutes when I'm running Morpheus. I tried using DynDNS.org but Morpheus does not resolve the hostname to my IP, it has to have a literal address. On the good side, Morpheus keeps this setting in a file called MorphConfig.ini and I have software that checks my IP every 5 minutes and updates my DynDNS record.


I want to insert my current IP address into the MorphConfig.ini file every 5 minutes. I can get my current IP from this other application or from a web page. How do I Insert data from this other application (or web page) into the .ini text file?

Below is the line where I want to update my IP
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You don't mention a language, so I'll just outline it:

Set timer to fire every 5 minutes
In timer routine:
1) Get IP any number of ways = API calls, shell out to  ipconfig, import from other app, etc
2) open INI file
3) Create INIX file
4) Read from INI, copyingt lines to INIX until encountering ForcedHost=
5) Write out new (possibly identical) ForcedHost= line
6) Copy over the remaining lines from INI to INIX
7) Delete INI
8) Rename INIX to INI


VB would be good. I'm running windows 2000 so something I don't have install anything new for.

I appreciate the outline.

It has to import from the other app, IPconfig will only get the IP of my machine. I need the IP on the other side of my router. I do not know how to grab data from another application.

For a timer, put a timer control on a form
In form load:

In Timer1_Timer() event:
' Get the IP however you import it from the other app
Open INI For Input As 1
Open INIX For Output as 2
Do While Not EOF(1)
    Line Input #1, INILine
    ' Don't waste time checking for a change in IP, just blast out the current one
    if left(UCase(Trim(INILine)),10)="FORCEDHOST" then
       print #2,"ForcedHost=" + IPAddrStringFromOtherApp
      print #2,INILine
kill INI
filecopy inix,ini
kill inix

This one is on us!
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It's more simple in VB.
Create a new form. Put a timer on it (Timer1).
Insert this code into the form:
' First declare two API functions - write/read to/from an ini file

Private Declare Function GetPrivateProfileString Lib "KERNEL32" Alias "GetPrivateProfileStringA" _
                         (ByVal lpApplicationName As String, ByVal lpKeyName As Any, ByVal lpDefault As String, _
                          ByVal lpReturnedString As String, ByVal nSize As Long, ByVal lpFileName As String) As Long
Private Declare Function WritePrivateProfileString Lib "KERNEL32" Alias "WritePrivateProfileStringA" _
                         (ByVal lpApplicationName As String, ByVal lpKeyName As Any, ByVal lpString As Any, _
                          ByVal lpFileName As String) As Long

' Change the values of this three constants for the program to suit your needs
Const PathToINI As String = "c:\Morph\"           ' Where your INI file is...
Const MyForcedIP As String = ""       ' What IP you want to have...
Const TimerInterval As Integer = 10000            ' Interval to check the INI file (in miliseconds 10000 = 10 seconds)

' You have to set the interval to a lesser value than the real change. You could also do some
' calculations. -> set the interval to 1 sec. Then, when the change occours set it to
' 4.8 minutes, then again to 1 sec., until the change appears, and again to 4.8 minutes...

Private Sub Form_Load()
  ' Let's check every minute
  Timer1.Interval = TimerInterval
  ' Start timer
  Timer1.Enabled = True
End Sub

Private Function INI_Read(mySection As String, myVariable As String, myFileName As String) As String
Dim strTemp As String
  ' Reading from an INI file
  strTemp = String(255, vbNullChar)
  INI_Read = Left(strRet, GetPrivateProfileString(mySection, ByVal myVariable, "", strTemp, Len(strTemp), myFileName))
End Function

Private Sub INI_Write(mySection As String, myVariable As String, myNewValue, myFileName As String)
Dim intTemp As Integer
  ' Writing to an INI file
  intTemp = WritePrivateProfileString(mySection, ByVal myVariable, CStr(myNewValue), myFileName)
End Sub

Private Sub Timer1_Timer()
Dim myIP As String
  ' Read from the INI
  myIP = INI_Read("Local", "ForcedHost", PathToINI & "MorphConfig.ini")
  ' Check if the value changed
  If MyForcedIP = myIP Then Exit Sub
  ' If it changed -> change it back
  INI_Write "Local", "ForcedHost", MyForcedIP, PathToINI & "MorphConfig.ini"
End Sub

And voila...

I was wondering if this was still an issue, if so did you get a chance to try what I suggested... (or do you have any questions about it?)


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