10 replies to this topic

[bulletprooffool]

Hi, this is a quick question,

I am quite new to most of this and am having a little difficulty with the MicroFramework.

I am building a project to pull info off the web and display it - I am able to gather info and am able to parse info now, but the one bit I text that I gather is surrounded by white space.
I have found the NetMF 4.2 replace, but my string is returned with some line breaks and I am unsure how to remove line breaks from my string.

If anyone knows this off the top of your head, please fire it my way.

I have tried:

 tagContent = replace(tagContent, "\n", "");
 tagContent = replace(tagContent, "\r", "");

using:

  public static string replace(string str, string unwanted, string replacement)
       {
           StringBuilder sb = new StringBuilder(str);
           sb.Replace(unwanted, replacement);
           return sb.ToString();
       }

Thanks
bpf

[bulletprooffool]

Got it - thanks.

Dropped a breakpoint, rechecked and found the return was skewed by a whole lot of tabs (\t)

Code now says:

 tagContent = replace(tagContent, "\n", "");
  tagContent = replace(tagContent, "\r", "");
 tagContent = replace(tagContent, "\t", "");

Seems to do what it says on the tin now . .

[dottorduino]

Hi folks, I can't find String.Replace in my NetDuino Plus project. This is the error: "String does not contain a defenition for 'Replace' and no extension method...bla bla bla" I use .Net MF 4.1

[nicolastintorre]

Hi All, When I use the function Replace(unwanted, replacement) of stringBuilder, if the "replacement" string length is bigger than "unwanted" length then the method throws "OutOfRangeException". I have microframework 4.2. Thanks in advance.

[marky-b]

Hi folks,
I can't find String.Replace in my NetDuino Plus project. This is the error:
"String does not contain a defenition for 'Replace' and no extension method...bla bla bla"

I use .Net MF 4.1

You cant actually do a <string>.Replace(), as strings don't have that method in the micro framework.

You can, however, do what bulletprooffool did and roll your own Replace() function, and call it wherever you need it. I like to have a utils.cs class to keep this kind of crap handy.

[OR]

If you don't want to get that fancy/reusable with it, you can just do it inline-ish by doing exactly what is in that function; make the String a StringBuilder, do your fiddling, and then assign it back to your original gangster String. That will look a little something like this:

String tacoString = "I like Tacos";
// "I like Tacos"
StringBuilder  tacoStringBuilder = new StringBuilder(tacoString);
tacoString = tacoStringBuilder.Replace("like","love").ToString();
// "I love Tacos"

Just be sure you get that last .ToString() in there; I don't think it will compile if you don't.

Hope this helps.

Mark

[marky-b]

Hi All,
When I use the function Replace(unwanted, replacement) of stringBuilder, if the "replacement" string length is bigger than "unwanted" length then the method throws "OutOfRangeException". I have microframework 4.2.
Thanks in advance.

I haven't had issues with the replacement text being longer than what it is replacing.

I found a pretty interesting bug back when 4.2 was still alpha-ish; outlined here

Have you tried with a shorter base string? You could possibly be running out of memory on the netduino. Try and compile a simple .NETMF project and run it locally on your PC. If it works there, but not on your netduino, I'm guessing you're asking a bit too much from it.

Possible workaround: Look at an example on the thread I linked above (first post in that thread, iirc) that reads through one char at a time and does the replacing that way. It was Valkyrie-MT's example. [WARNING: It's not pretty]

[Chris Walker]

One other thought: .NET Micro Framework supports extension methods. So you may be able to extend the String class in .NET Micro Framework and use your desktop .NET code as-is. Chris

[don664]

Hi there,

I'm trying to post a date/time via an HTTP request for an application I'm writing. The only problem is that I am getting an error because of the space in the date/time.

string = "&dateTimeStamp=06/01/2011 00:00:28"

I need it to be

string = "&dateTimeStamp=06/01/2011%2000:00:28"

I have created the following:

public static string replace(string str, string unwanted, string replacement)
        {
            StringBuilder sb = new StringBuilder(str);
            sb.Replace(unwanted, replacement);
            return sb.ToString();
        }

but calling it like this does not get rid of the space:

string httpLine = replace(originalLine, " ", "%20");

Is there an escape character I should use for replacing the space?

Thanks,
Donovan

[JerseyTechGuy]

Hi there,

I'm trying to post a date/time via an HTTP request for an application I'm writing. The only problem is that I am getting an error because of the space in the date/time.



I need it to be



I have created the following:

public static string replace(string str, string unwanted, string replacement)
        {
            StringBuilder sb = new StringBuilder(str);
            sb.Replace(unwanted, replacement);
            return sb.ToString();
        }

but calling it like this does not get rid of the space:

string httpLine = replace(originalLine, " ", "%20");

Is there an escape character I should use for replacing the space?

Thanks,
Donovan

What version of the framework and firmware are you using. I tried this using 4.2.0.1 and it replaced the space however it messed up the time. If my time was "11/26/2012 00:00:00" after the replace it showed as "/211/26/201%2000:00:00". Probably a bug in the framework.

[Nicky]

I usually make an extension:

public static class Extensions 
    {
        public static string Replace(this string str, string what, string with)
        {
            int index = -1;

            while ((index = str.IndexOf(what)) != -1)
            {
                if (index > 0)
                {
                    str = str.Substring(0, index) + with + str.Substring(index + what.Length);
                }
            }

            return str;
        }
    }

And then uses it by:

string str = "something";
str.Replace("\r", "");

[StefanUSMC]

I came across a codeplex project called .NET Micro Framework - Common Extensions that adds a few helpful extension methods, including string.replace. I have used a few of them, and have not had any issues with using them on NetMF 4.2. Hopefully it is as helpful for you as it was for me.

http://netmfcommonext.codeplex.com/