Re: How to simulate map c++ collection in c# - C# Discussion Boards

Re: How to simulate map c++ collection in c#

11-Jan-04 11:54

Please do not re-post - continue the original thread.

What you're code is using is an enumerator. The Hashtable and other collections support this, too. See Hashtable.GetEnumerator, which returns an IDictionaryEnumerator. Other collections and lists (those that implement IEnumerable, which ICollection and IList do, so any of their implements do as well) return an IEnumerable.

If the Hashtable doesn't work for you, there are plenty of other collections and lists in System.Collections and System.Collections.Specialized that can. If you don't like the provided implementations, write your own ICollection, IList, or IDictionary implementation.

Rostrox11-Jan-04 12:13

Rostrox

11-Jan-04 12:13

Heath:
Many thanks for your answer.
The real problem is with the structure:
struct stTot {
string strDesc;
double fTots[cols];
} myTot;
I cannot replicate this in C#. I tried many alternatives but I do not really know how to use it (the structure) during the Hashtable loading and recovery of data. A non elegant solution is to join every field that is in the mentioned structure into an string variable and then split them during recovery.
Best regards

Re: How to simulate map c++ collection in c#

Heath Stewart11-Jan-04 12:22

11-Jan-04 12:22

public struct myTot
{
  public string strDesc;
  public double[] fTots;
}

As you can see, there are a few limitations due to either the language specifications or the .NET Framework.

As far as putting this in a collection or Hashtable, the default, non-specialized implementations take objects as both keys and values. Ever class or value type (which a struct is) derives from System.Object, so you can put a struct in a Hashtable:

myTot tot = new myTot();
tot.strDesc = "blah";
tot.fTots = new double[] {1.2, 3.4};
Hashtable t = new Hashtable();
t["key1"] = tot;
// ...
Console.WriteLine(((myTot)t["key1"]).strDesc);

Read the documentation for the classes in System.Collections about enumerations, collections, lists, and dictionaries. For instance, to enumerate through all the values of a dictionary using the keys, you could do the following:

// Use "t" from example above for hashtable.
IEnumerator e = t.Keys.GetEnumerator();
while (e.MoveNext())
{
  Console.WriteLine("{0}: {1}", e.Current, t[e.Current]);
}

You could also use the foreach keyword for a shortcut:

foreach (object key in t.Keys)
{
  Console.WriteLine("{0}: {1}", key, t[key]);
}

startup parameters?

Leon Radley11-Jan-04 10:35

Leon Radley

11-Jan-04 10:35

I have a windows form application that i'd like to be able to send startup parameters to tell it what settings file to load say:

myApp.exe /settings.xml

how would a do this?

EuroCPian Spring 2004 Get Together[^]

Colin Angus Mackay11-Jan-04 10:57

Colin Angus Mackay

11-Jan-04 10:57

There are two ways:

1. You receive the startup parameters through an array of string objects passed into the static Main() method.

2. You can access the startup paramters from anywhere in your application using Environment.CommandLine property (this will give you the whole command line as one string) or the Environment.GetCommandLineArgs() method which will split the command line up into its component arguments. See MSDN for more details on how to use these methods/properties.

I hope this helps,
Colin.

--Colin Mackay--

Heath Stewart11-Jan-04 11:32

11-Jan-04 11:32

Colin's right about command-line parameters, but if you want to pass settings specifically, you should use a .config file (in the form, yourappname.exe.config) and use either the <appSettings> section or make your own using IConfigurationSectionHandler. Use that as a keyword to search the CodeProject articles for a slew of examples. This is a better way since if is directly supported by the CLR and the class library, as well as maintains all settings for an application (even ones that you're application doesn't use directly, like assembly bindings) in one file.

Nick Parker11-Jan-04 11:38

Nick Parker

11-Jan-04 11:38

Heath Stewart wrote:
Use that as a keyword to search the CodeProject articles for a slew of examples.

Or he could just use mine: An extension for a Configuration Settings class in .NET[^] Poke tongue | ;-P

- Nick Parker
My Blog

Heath Stewart11-Jan-04 11:42

11-Jan-04 11:42

That's the first one that came to mind! Smile | :)

I just thought a search would pull up some alternatives that may provide some other ways of doing things or specific examples he might be interested in.

RegEx Guru?

Rocky Moore11-Jan-04 10:13

Rocky Moore

11-Jan-04 10:13

I have not hardly cut my teeth on RegEx yet. What I am trying to figure out is a way to replace line feeds with 's but not between of < PRE > and < /PRE > tags. Any easy answer to do with with RegEx?

Rocky <><
www.HintsAndTips.com

Re: RegEx Guru?

Heath Stewart11-Jan-04 11:35

Coding search and replace on content of file

11-Jan-04 11:35

This is possible using regex with a multi-line expression, but if you're working with HTML you probably shouldn't do this. What if an element spans multiple lines and you replace the new line with  ? You cause HTML errors that browsers will choke on. Putting breaks after inline images would also be bad, since it would screw up the flow of the image with the paragraph that surrounds it. There are several other cases where this would be bad, too.

To better help you solve this problem, let me ask why you want to do this? If you're generating the HTML files, it would be better to do this in the first place, or if you want to modify the files you should use a good HTML reader (unfortunately there isn't a specific reader in the base class library for HTML, though there is the HtmlTextWriter).

Re: RegEx Guru?

Rocky Moore11-Jan-04 16:47

Rocky Moore

11-Jan-04 16:47

I have text input via a multipe line TextBox and onces I Server.HTMLEncode it, I need to add the s for linefeeds. In a specially flagged section though I will be using a < Pre > tag and it requires linefeeds instead of the s. There are no HTML tags in any of the text entered, just a special tag which I will replace with < Pre > section.

This is for my HintsAndTips.com site that I will FINALLY be launching tonight (and hopefully, people will like posting tips to share Wink | ;)

since there are only a couple at the moment ). When they post their tips I have to have a special section for things such as code that you do not want text wraping and handle this through a special tag people can use to enclose that section. It is replaced with a scrollable div and a pre tag (to be more compatible with old IEs or would just use the "white-space" css feature).

At the moment I have it replacing all the linefeeds with s and they look okay in the browser, but the < Pre > does not handle blank lines and stacks the lines on top of each other.

I will be providing a better method of composing tips in the near future, but just needed something to allow people to display text that is much wider then the area provided and a scrollable div works great for that. Kind of like on CP when someone does not format an article good and it takes three monitors to view it horizonally Wink | ;)

Did not want that happening Wink | ;)

Here is an example of tip with the Pre section I was referring to:

http://www.hintsandtips.com/hat.aspx?P=ShowTip&C=31&T=10[^]

Please excuse the home page at the moment, it will be created later tonight Blush | :O

Rocky <><
www.HintsAndTips.com

cgcrute11-Jan-04 5:59

11-Jan-04 5:59

I'm teaching myself C# at present and I have hit a wall!

I need to be able to locate a specific string within a file (not a text file, an excel file) and replace it with another. The two strings may not be the same length.

I can open the filestream and open a binaryreader on it but am stuck from there.

Does anyone have any suggestions, or better still some example code I can learn from??

Many thanks, in advance,

Chris

Mazdak11-Jan-04 6:12

Mazdak

11-Jan-04 6:12

cgcrute wrote:
I can open the filestream and open a binaryreader on it but am stuck from there.

What is your code? So we can better help you.

Mazy

No sig. available now.

cgcrute11-Jan-04 8:50

11-Jan-04 8:50

I didn't include the code I had come up with as it amounts to 2 lines! Don't forget I'm starting out - although I have worked miracles so far!

Here's the code anyhow, for what it's worth:

FileStream reportFile = new FileStream(saveFileDialog1.FileName, System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite);

BinaryReader reportBin = new BinaryReader(reportFile);

Mazdak11-Jan-04 9:11

Mazdak

11-Jan-04 9:11

The think that I can see is BinaryReader is for reading but you create FileStream in ReadWrite mode,change it to Read mode,and for writng into create another stream. If it didn't solved then tell what error you encounter. Also in msdn there are some samples for writing into and reading from file in BinaryReader page,you can check it.

Mazy

No sig. available now.

cgcrute11-Jan-04 9:24

11-Jan-04 9:24

That isn't so much the problem, but I'll certainly take your advice and use separate streams for reading and writing.

The issue I have is getting the content of the stream into a format that I can use something like regex on to do the search/replace.

I'll check the msdn site too...

Many thanks

Meysam Mahfouzi11-Jan-04 18:38

Meysam Mahfouzi

11-Jan-04 18:38

Why don't you manipulate your excel file using Excel Automation?

Don't forget, that's

Persian Gulf

not Arabian gulf!

Mazdak11-Jan-04 20:01

Mazdak

11-Jan-04 20:01

m a y s a m wrote:
Why don't you manipulate your excel file using Excel Automation?

He said he is teaching himself C#,so maybe its just a practise for himself.

Mazy

No sig. available now.

Jonathan de Halleux12-Jan-04 0:06

Jonathan de Halleux

12-Jan-04 0:06

Use regular expression (RegEx class).

Jonathan de Halleux.

www.dotnetwiki.org

cgcrute12-Jan-04 0:17