Question

Parsing an array of strings into a structure, without tons of code.

Asked by: Zen_Dragon

Im parsing comma seperated values out of a text file and I would like to bascially map it to a structure automatically. There are over 50 fields that need to be matched, so Im trying to find a way to do this without having to code each value. The text file comes in in the same order that the structure is coded so assuming there are no problems in the comma seperated values its pretty much a 1:1 mapping. Is there an easy way to do this or am I going to have to assign all 50 values manually?

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2009-06-23 at 11:34:35ID24515752
Tags

VB.NET

Topics

.NET

,

Visual Basic Programming

,

C# Programming Language

Participating Experts
4
Points
500
Comments
14

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. par file
    Waht is a file with .par used for and what does this extension mean? Can I list the parameters for import in a .par file and use this file in imp, like imp file=filename.par Please suggest.
  2. par io err laserjet 4 plus
    Every time I start my computer my old laserjet 4 plus comes up with an error message on the control panel "err par io" the work around is to cycle power on the printer after the computer is loaded. This problem started when I got a new computer. I have tried chan...
  3. PAR Protocol
    How has the PAR Protocol been extended for use in the Internet?
  4. Converting from PERL to Executable using PAR
    I have a PERL script that begins with the following: use Win32::OLE qw(in with); use Win32::OLE::Const 'Microsoft Excel'; When I convert my PERL script to an executable using pp -o file.exe file.pl, there is no problem. But, when I run file.exe I receive the following pop-...
  5. What does the /par in a .bat file mean?
    I am learning to do batch files, and came across this /par in my .bat file. I dont know really how it got there, as I was just manually creating the batch. I did just install easy batch creator, but I didnt use that prog. Anyway here is the code that I have in my batch, but ...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: angelIIIPosted on 2009-06-23 at 11:37:26ID: 24694629

to get a comma-separated string into an array is simple: the string class has a split method:
http://msdn.microsoft.com/en-us/library/system.string.split.aspx
as from there, you can loop on the resulting array...

 

by: Zen_DragonPosted on 2009-06-23 at 11:40:46ID: 24694662

Ive alread read the CSV into the array, Im trying to essentially map the array to a structure without having to assign every value manually. Does that make sense?

 

by: angelIIIPosted on 2009-06-23 at 11:43:05ID: 24694690

yes, that does make sense.
however, there is no real 1-liner way around this.

 

by: learning_t0_pr0gramPosted on 2009-06-23 at 11:50:20ID: 24694753

Just open the file, store it into a buffer, split it into an array, and then loop through it to assign to your structure.

-------------------------------------------------------

Dim FF As Integer, Buffer As String, myArray() As String, i As Integer

FF = FreeFile

Open "C:\YourFile.txt" For Binary As #FF
    Buffer = Space(LOF(FF))
    Get #FF, , Buffer
Close #FF

myArray() = Split(Buffer, ",")

For i = 0 to UBound(myArray)
    ' Do what you want here with myArray(i)
Next

-------------------------------------------------------

If you have more than one comma delimited field, just split it twice.  once by vbCrLf (or vbCr or vbLf, depending on how your file is made), and then split each field by a comma in a nested loop.

 

by: InternalStaticPosted on 2009-06-23 at 11:51:29ID: 24694767

Unfortunately, angel||| is correct; there is no really easy way around this.

However, we can produce a work-around. I'm assuming your structures fields are all named differently, with no real pattern between them. What we can do is analyze your type in a "temporary" program, get all the fields using reflection, copy them to your clipboard, and assign them manually, without actually typing it all out. I'll type the psuedocode out, but you let me know if it's what you're looking for. If so, we'll get to the code.

- Store the data in an array using File.ReadAllText and String method Split to split by the commas (not very memory efficient, but hey, we'll get to that later)

- Step through the fields in your type (using Reflection), and copy a basic structure to your clipboard. You can then paste this code directly into your original class, and viola, foolproof code done automatically.

Let me know,

Nate

 

by: Zen_DragonPosted on 2009-06-23 at 13:40:54ID: 24696020

Thats what I was afraid of! haha I was hoping there was some obscure way to maybe enumerate members of a structure or something.

 

by: Zen_DragonPosted on 2009-06-23 at 13:53:13ID: 24696151

Wow theres been a couple posts since I started that comment. The whole process is pretty simple. I have a text file with lines of comma seperated values. However one line may not have the same amount of columns as the next. Unfortunately these  are standard formats used in banking and are sent to us by banks to record transactions so I can not modify the file. I simpleyhave to parse it as is and deal with the ouput. What I am doing is writing a class to verify the file before they go through the data transformation application and dropped into the databases.That application doesnt handle malformatted files well. Anyhow thats just a little background on the issue.

So I have a document with the definitions of all the colums, and different types of lines in the file (distrobution, trade, check/eft payment, etc). Im starting with the distrobution entry, which in this case has 41 columns and is identified by the first column with a value of "D". So I created a structure that represents the distrobution entry that contains all of the columns from the definition. So I read the line in the text file, and using a regex expression, parse out the the values into an array of strings. From that point I wanted to read those values into the structure in the exact order that they appear in the structure. The problem itself is not difficult, I was simply trying to avoid having to change a bunch of code if the columns change. I wanted to write it such that I would only need to change the structure and recompile to support new fields. That and some of the other entries have a lot more than 41 colums and I wanted to avoid having to manually code assignments for every single column.

 

by: InternalStaticPosted on 2009-06-23 at 16:43:06ID: 24697408

So will the ordinal of the column always be the same in each line? If so, you can just use an array in your class, whip through the lines of the file, and split the lines by the delimiter (probably a comma, since it's a CSV). See the code snippet for an example, and let me know if this is what you're thinking.

foreach(String line in File.ReadAllLines(filePath))
{
     String[] data = line.Split(DELIMITER);
     // Will data[0] always represent the same thing, as well as
     // data[1], data[2], and on, and on? By same thing I mean will
     // a certain index always be their account number, the type of
     // transaction, a dollar amount, etc.?
}

                                              
1:
2:
3:
4:
5:
6:
7:
8:

Select allOpen in new window

 

by: ArkPosted on 2009-06-24 at 01:29:31ID: 24699189

You can have any dictionary object (hash table, for example) and an array of field names
dim arrFields() as string={"field1","field2","etc"}
dim htStructure as New HashTable
'read one line and split it into arrOneLine array
for i as integer=0 to arrOneLine.length-1
   htStructure.Add(arrFields(i),arrOneLine(i))
Next

When columns order/count change-just change arrfFelds array

 

by: Zen_DragonPosted on 2009-06-25 at 08:26:40ID: 24712374

See thats the thing, each line may change. For example a line of distrobution type "D" will always be immediately followed by a EFT transfer "E" or a check line "C" which have only 8 and 12 columns respectivly. I cant simply parse the entire file or parse every line the same for that matter, I have to parse line by line and run tests to validate each line. So basically parse out the line into an array of strings, and take the first column of each line to determine the type.

So seeing as how there appears to be no way to do that without having to manually assign values, ive decided to just abandon trying to parse it into a class at all. Ill have to find a different way to do this.

 

by: angelIIIPosted on 2009-06-25 at 08:42:44ID: 24712599

you could create an array of array.
the first level is the "C", "D", "E" code, and the second level would configure the fields per type...

 

by: Zen_DragonPosted on 2009-06-25 at 09:00:35ID: 24712805

So what Im thinking at this point is to just read the "rules" for each line type into a class and just verify each incoming line against the rules class based on its line identifier. This way at least I dont have to store each line, and to add new types I just add properties to the rules class. I can take that a step further and just store the rules in an xml file so I dont have to modify the code at all to add new files. I lose some possible functionality in terms of what I can do with each line but Im not sure I will need to be building on that too much anyhow.

Angel, good suggestion would probably make parsing subsequent lines much easier. I hate these obscure file formats that they send us. Its like these things were designed by accountants and not programmers. Most of them make no sense and are very difficult to parse, at least this one is CSV.

Though ultimately what I was looking for is just some method for enumerating properties of a class. I think the reflection technique is probably the only way I could really do that, though it might take some "jerry rigging."

 

by: ArkPosted on 2009-06-25 at 14:18:25ID: 24716135

Hi
In your case you can add one more hashtable:
Dim htFields As New HashTable
dim htStructures As New HashTable
htFields.Add("A",New String(){"Field1","Field2","Field8"})
htFields.Add("B",New String(){"Field1","Field2","Field8"})
htFields.Add("C",New String(){"Field1","Field2","Field8"})
'............
'Note - you can populate above ht from *.ini text or xml file without recompiling project if rules changes.
dim sKey as string = arrOneLine(0)
arrFields=htFields(sKey)
for i as integer=0 to arrOneLine.length-1
   htStructure.Add(arrFields(i),arrOneLine(i))
Next
You can have an array (or new hash) of htStructures for all liines

 

by: Zen_DragonPosted on 2009-08-13 at 13:47:35ID: 31595642

I wasnt really sure who to award points to here so I just split it between everybody that commented. Thank you all for your input.

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...