Hi everyone,

I am rather new to C# and have a problem that will probably seem trivial to
most of you... but I hope you can still help me nevertheless..

Via the comport, I read the result of a digital scale... the result is sent
as a string like "+0000.23kg", representing the weight in kilograms.

In order to work with the returned value, I need to use it as a float or
decimal or double... I tried casting it via Convert, via float.Parse etc...
but I always get either a wrong value (eg. "0000.24" results in "24" instead
of "0.24") or an exeption.

Does anyone have an Idea how I can get this as a float?

Thanks!

Thorsten

Hi Thorsten,

You could try using a regular expression:

Match match = Regex.Match(input, "[\+\-](?<N>\d*\(\.\d+)?)(?<S>\w+)");

if (!match.Success)
throw new FormatException("Invalid input data.");

float number = float.Parse(match.Groups["N"].Value);
string scale = match.Groups["S"].Value;

(I didn't test this code so it might need some mods.)

Regular Expression Language Elements
http://msdn2.microsoft.com/en-us/library/az24scfc.aspx

--
Dave Sexton

"Thorsten" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi everyone,
>
> I am rather new to C# and have a problem that will probably seem trivial
> to most of you... but I hope you can still help me nevertheless..
>
> Via the comport, I read the result of a digital scale... the result is
> sent as a string like "+0000.23kg", representing the weight in kilograms.
>
> In order to work with the returned value, I need to use it as a float or
> decimal or double... I tried casting it via Convert, via float.Parse
> etc... but I always get either a wrong value (eg. "0000.24" results in
> "24" instead of "0.24") or an exeption.
>
> Does anyone have an Idea how I can get this as a float?
>
> Thanks!
>
> Thorsten
>

Hi Thorsten,

I just realized that I didn't include the sign in the N group and added an
extra \. Correction:

> +0000.23kg

(?<N>[\+\-]?\d*(\.\d+)?)(?<S>\w+)

--
Dave Sexton

"Dave Sexton" <dave@jwa[remove.this]online.com> wrote in message
news:%238$(E-Mail Removed)...
> Hi Thorsten,
>
> You could try using a regular expression:
>
> Match match = Regex.Match(input, "[\+\-](?<N>\d*\(\.\d+)?)(?<S>\w+)");
>
> if (!match.Success)
> throw new FormatException("Invalid input data.");
>
> float number = float.Parse(match.Groups["N"].Value);
> string scale = match.Groups["S"].Value;
>
> (I didn't test this code so it might need some mods.)
>
> Regular Expression Language Elements
> http://msdn2.microsoft.com/en-us/library/az24scfc.aspx
>
> --
> Dave Sexton
>
> "Thorsten" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Hi everyone,
>>
>> I am rather new to C# and have a problem that will probably seem trivial
>> to most of you... but I hope you can still help me nevertheless..
>>
>> Via the comport, I read the result of a digital scale... the result is
>> sent as a string like "+0000.23kg", representing the weight in kilograms.
>>
>> In order to work with the returned value, I need to use it as a float or
>> decimal or double... I tried casting it via Convert, via float.Parse
>> etc... but I always get either a wrong value (eg. "0000.24" results in
>> "24" instead of "0.24") or an exeption.
>>
>> Does anyone have an Idea how I can get this as a float?
>>
>> Thanks!
>>
>> Thorsten
>>
>
>

1. I think the word casting is inappropriate, this is a conversion of
external data to an internal format rather than conversion of data from one
internal format to the other.

2. Take a look at Double.TryParse.

3. If it is always kg you can remove it with substring.

JR

"Dave Sexton" <dave@jwa[remove.this]online.com> wrote in message
news:(E-Mail Removed)...
> Hi Thorsten,
>
> I just realized that I didn't include the sign in the N group and added an
> extra \. Correction:
>
>> +0000.23kg
>
> (?<N>[\+\-]?\d*(\.\d+)?)(?<S>\w+)
>
> --
> Dave Sexton
>
> "Dave Sexton" <dave@jwa[remove.this]online.com> wrote in message
> news:%238$(E-Mail Removed)...
>> Hi Thorsten,
>>
>> You could try using a regular expression:
>>
>> Match match = Regex.Match(input, "[\+\-](?<N>\d*\(\.\d+)?)(?<S>\w+)");
>>
>> if (!match.Success)
>> throw new FormatException("Invalid input data.");
>>
>> float number = float.Parse(match.Groups["N"].Value);
>> string scale = match.Groups["S"].Value;
>>
>> (I didn't test this code so it might need some mods.)
>>
>> Regular Expression Language Elements
>> http://msdn2.microsoft.com/en-us/library/az24scfc.aspx
>>
>> --
>> Dave Sexton
>>
>> "Thorsten" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>> Hi everyone,
>>>
>>> I am rather new to C# and have a problem that will probably seem trivial
>>> to most of you... but I hope you can still help me nevertheless..
>>>
>>> Via the comport, I read the result of a digital scale... the result is
>>> sent as a string like "+0000.23kg", representing the weight in
>>> kilograms.
>>>
>>> In order to work with the returned value, I need to use it as a float or
>>> decimal or double... I tried casting it via Convert, via float.Parse
>>> etc... but I always get either a wrong value (eg. "0000.24" results in
>>> "24" instead of "0.24") or an exeption.
>>>
>>> Does anyone have an Idea how I can get this as a float?
>>>
>>> Thanks!
>>>
>>> Thorsten
>>>
>>
>>
>
>

Replace the dot with a coma, Then try convert.


"Thorsten" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi everyone,
>
> I am rather new to C# and have a problem that will probably seem trivial
to
> most of you... but I hope you can still help me nevertheless..
>
> Via the comport, I read the result of a digital scale... the result is
sent
> as a string like "+0000.23kg", representing the weight in kilograms.
>
> In order to work with the returned value, I need to use it as a float or
> decimal or double... I tried casting it via Convert, via float.Parse
etc...
> but I always get either a wrong value (eg. "0000.24" results in "24"
instead
> of "0.24") or an exeption.
>
> Does anyone have an Idea how I can get this as a float?
>
> Thanks!
>
> Thorsten
>
>

"TheSteph" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Replace the dot with a coma, Then try convert.

That's a good point, you could have locale issues. Use the overload of
double.TryParse that accepts an IFormatProvider and use the invariant
culture.

>
>
> "Thorsten" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Hi everyone,
>>
>> I am rather new to C# and have a problem that will probably seem trivial
> to
>> most of you... but I hope you can still help me nevertheless..
>>
>> Via the comport, I read the result of a digital scale... the result is
> sent
>> as a string like "+0000.23kg", representing the weight in kilograms.
>>
>> In order to work with the returned value, I need to use it as a float or
>> decimal or double... I tried casting it via Convert, via float.Parse
> etc...
>> but I always get either a wrong value (eg. "0000.24" results in "24"
> instead
>> of "0.24") or an exeption.
>>
>> Does anyone have an Idea how I can get this as a float?
>>
>> Thanks!
>>
>> Thorsten
>>
>>
>
>