Save\Load values as text file

Save\Load values as text file

• Martyn Upson

  OK

  I knew how to save the values A="v1" & B="v2".

  But how can I load the values separately

  I need A value and B value which equal "v1","v2".

  
  

• rouellet

  Thanks

  It is a good example.

  
  

• Øyvind Habberstad

  OK

  How can I load them from the text file

  It saves them as one word "v1v2" not "v1","v2". (I supposed A=v1 and B=v2)

  
  

• Solange

  Just to be clear, as Reed Kimble says ("...you really don't want to use them...") this is NOT good code, even though it may function.
  
  

• Luis D. Rojas

  Please look at the code and see what its doing. Its simply writing a concatenated string. If you want to write commas in there than add them in the string, likewise with quotation marks.

  A & "," & B

  To load the file.

  You can use the My.Computer.Filesystem.ReadAllText

  http://msdn2.microsoft.com/en-us/library/ks09bsaw.aspx

  or you can check out the TextFieldParser

  http://msdn2.microsoft.com/en-US/library/microsoft.visualbasic.fileio.textfieldparser.aspx

  All depends on what you want to do .

  There are example on using each of the methods to read in the text on a file and process them. Thats down to you to work out for your own applications needs.

  
  

• badbadboy

  Shortly,

  Is there a way to save variables and recall them to/from a text file

  
  

• IraFel

  Couple of comments:

  1. The VB6 upgrade tool does quite a good job (sometimes). You can use that if you want to know how something may be done. It also pointed out a couple of problems with your existing VB6 code: Op gets upgraded to an object: the origional was declared as a variant.

  2. There are a Ton+1 ways to do things in .NET. You may want to think about what you are trying to do, and type that into help: you'll get quite a few hits.

  Now, to your problem: depending on how you write the variables, you will need to read them back in the same way. If you write them on the same line, you will need to separate them (witha comma is a goodway), then when you read the LINE back, split the line on the comma. The first string in the split is the first variable, the second string is the second one.

  Perhaps you can write them on different lines The first one is A and the second one is B Or, write lines such as:

  A=TheAString
  B=TheBString

  Then parse the lines, splitting on the '=' and interpreting the two strings for each line.

  Some things to bear in mind:

  they are strings - you will need to take care in converting the strings to numbers (if that's what you eventually may do). Additionally, what will happen to your program if you get two zero length strings Strings which are not valid for the application no line at all Strings with commas in them (these are the things you will HAVE to take care of).

  Writing more data Perhaps you could put your variables into a serializable class (the whole class can be written as XML or a binary file, or a base64 encoded binary stream).

  If they are Settings, you could use the my.settings to save the values, and let .NET take care of it.

  
  
  

• Timmos101

  "But how can I load the values separately "

  I see the words, but I still do not understand what you are asking. What does load the values separately mean

  Can you descibe the sequences of events the you desire to have happen

  
  
  

• oholliday

  onh1986 wrote:

  Is there way to do that in VB2005

  If you are writing a program to read the files written by the VB6 application then Spotty has the correct/closest answer. Use the text field parser.

  Or use the vb6 upgrade tool: it's on the Tools menu - 'Upgrade Visual Basic 6 Code...".

  
  
  

• chovy

  ReneeC wrote:

  "But how can I load the values separately " I see the words, but I still do not understand what you are asking. What does load the values separately mean Can you descibe the sequences of events the you desire to have happen

  I will explain more.

  I defined A="v1" and B="v2" and I saved them as a text file.

  My.Computer.FileSystem.WriteAllText ("D:\File.txt",A & "," & B)

  That means that text file contains "v1,v2", right

  Now after saving, I want to get A and B variables from File.txt

  According to File.txt content, A=v1 and B=v2, right

  How can I attach A=v1 & B=v2 (from File.txt)

  In VB6, I was using the code in the top of this page.

  
  

• Pokey

  Here are two subroutines that represent what you used to do in VB6:

  Private Sub SaveDataToText()

  Dim a, b As String
  Dim writer As System.IO.StreamWriter = System.IO.File.CreateText("c:\file.txt")

  a = "V1"
  b = "V2"

  writer.Write(ControlChars.Quote)
  writer.Write(a)
  writer.Write(ControlChars.Quote)
  writer.Write(",")
  writer.Write(ControlChars.Quote)
  writer.Write(b)
  writer.Write(ControlChars.Quote)
  writer.Close()

  End Sub

• sonique

  Spotty gave you the correct answer; you have to read the file back into the string and then parse it by using the Split() method at all commas.

  But I think the real question here is: Do you need the CSV (comma seperated values) file If you just want to save your values and recall them later, and you don't really care about the file format, then you should follow the other suggestion posted here and change formats. XML would probably be a great option. Binary serializaion is also quick and easy if you only need sequential access to your save file.

  If you can use XML then I'd highly suggest trying it. You should be able to find plenty of examples of simple XML manipulation. If you have to have the CSV, then read in the file and parse it with Split().

  If you're still unsure how to proceed, please give us a better idea of what you're doing with the saved data (just saving for later use, transfering to some other person or system, or whatever) and how you need to access it (read the whole thing like opening a word file, or accessing specific pieces as needed like a database).

  
  
  

• Jherek

  The following code will do the trick in VB Express/2005 making use of the My.Computer.FileSystem.WriteAllText method

  Dim A As String, B As String
  Dim Content as string =A & B

  My.Computer.FileSystem.WriteAllText ("D:\File.txt", Content, False)

  
  

• Keith Schengili-Roberts

  I was using VB6 and I'm a new user in VB2005.

  VB6 was saving them with commas and it can recall them easily by using this codes:

  Save:

  Dim A As String, B As String, Sv
  Sv = FreeFile
  A = "v1"
  B = "v2"
  Open "D:\File.txt" For Output As Sv
  Write #Sv, A, B
  Close Sv

   

  Recall:

  Dim A As String, B As String, Op
  Op = FreeFile
  Open "D:\File.txt" For Input As Op
  Input #Op, A, B
  Close Op

  After saving, we note that File.txt contains: (look at the pic)

  http://www.onh1986.com/vb2.jpg

  Is there way to do that in VB2005

  
  
• Save\Load values as text file