Question about substr()

[minifiredragon]

I have been doing some looking around on ways to read certain characters of a CString into different variables and found substr();. But when I impliment it, I get an error:

C2039: 'substr' : is not a member of 'ATL::CStringT<BaseType,StringTraits>'
with
[
BaseType=char,
StringTraits=StrTraitMFC_DLL<char>
]

is there something I am doing wrong or can't it be used for a CString? Here is how I use it:

CString numtocheck = m_strcardcheck;
CString firstfour;
firstfour = m_strcardcheck.substr(0,4);

As you see I want the 1st four digits of the number entered. Some advice would be a great help, since you all have helped tremendously in the past.

Thanks!!

PS. I did search the forum here and found 2 threads on substrings but neither were of use.

 

[PerFnurt]

The error desc says it all:
'substr' : is not a member of 'ATL::CStringT<BaseType,StringTraits>'

CString firstfour = m_strcardcheck.Left(4);


/Per
_{Nerdy signatures are as lame as the inconsistent stardates of STTNG.}

 

[minifiredragon]

But I thought it took 2 numbers and not one?? Or is it not needed if you start in the beginning?

 

[minifiredragon]

Sorry I pushed the submit button instead of preview post, so please ignore my above post. I see that u are using the left command, but what would I do when I wanted the get the rest of the string (after the 1st 4)? Isn't that was substr is used for?? I saw on MSDN that they use it. Now I am a bit lost.

 

[PerFnurt]

>what would I do when I wanted the get the rest of the string

Some examples:

CString firstFour = m_strcardcheck.Left(4);
CString afterFirstFour = m_strcardcheck.Mid(4);
CString firstThreeAfterFirstFour = m_strcardcheck.Mid(4,3);
CString lastSeven = m_strcardcheck.Right(7);

>Isn't that was substr is used for
There are several ways to do the same thing. Or more specific: There are several ways to represent a string.

With CString comes Left, Right and Mid, (so I'd say it's appropriate to use them when dealing with CStrings).

substr is a std::string method, not a CString gizmo (although I can see that CString in .NET has stolen borrowed a lot of ideas from the std::string implementation).






/Per
_{Nerdy signatures are as lame as the inconsistent stardates of STTNG.}

 

[minifiredragon]

Interesting, where can I get more information on the availible functions of CString?? It took me a day to locate substr. I ran searches in google on CString functions, but they appear to be all std::string functions.

I would love to get a reference like MASM's programming codes where they have all the commands in there, and ya just look up what u need.

 

[PerFnurt]

http://msdn.microsoft.com/library/d...n-us/vclib/html/vclrfcstringtclassmembers.asp

/Per
_{Nerdy signatures are as lame as the inconsistent stardates of STTNG.}

 

[minifiredragon]

I see, thanks!! That explains why I didn't find anything, I only searched for CString, not CStringT.

 

[PerFnurt]

>I see, thanks!!

No problem. Thanks for the star ;-)

>I only searched for CString, not CStringT

Actually, since I haven't looked into C++ in .NET myself I searched for &quot;StrTraitMFC&quot;. It seemed like a unique enough search-word that was part of your first posting
(and I haven't heard of such a thing in MFC versions I'm familiar with)






/Per
_{Nerdy signatures are as lame as the inconsistent stardates of STTNG.}