Hi Shawn,
with TString this is easily done using the operator()(start, len):
TString s("bla blu bla")
TString sub = s(4,3);
Cheers, Fons.
On Tue, 2002-07-23 at 13:57, Shawn Kwang wrote:
> Brett; Simon,
>
> I originally wrote a C++ program to do what I want. Now I am trying to do it
> in ROOT. I thought that most of C++ was compatible with ROOT, but
> string::substr seems to be an exception.
>
> Here are some lines from my ROOT macro.
>
> const int commentstart=67;
> const int commentlength=180;
> string inputstring;
> string comments;
>
> (stuff)
> inputstring=/*(line from a file)*/
> //Takes the comments section as a substring
> comments=inputstring.substr(commentstart, commentlength);
>
> When I run this ROOT actually dies. It does not spit an error. It does not
> give back a ROOT prompt. All I get back is my tsch prompt.
>
> Sincerely,
> Shawn Kwang
>
> On Monday 22 July 2002 20:30, Brett Viren wrote:
> > STL's string has
> >
> > string string::substr(begin_index, end_index).
> >
> > The indices count from 0.
> >
> > -Brett.
> >
> > Simon Dean writes:
> > > Hi Shawn,
> > >
> > > You could try doing
> > >
> > > char mystring[200] = <the_name_of_your_TString_here>->Data();
> > >
> > > and then you could access whichever part of the string you wanted by
> > > using the index; mystring[67] or whatever. Obviously, 'mystring' needs
> > > to be big enough to accomodate your TString.
> > >
> > > Hope that helps,
> > >
> > > cheers,
> > >
> > > Simon
> > >
> > > On Mon, 22 Jul 2002, Shawn Kwang wrote:
> > > > Roottalk,
> > > >
> > > > I want to extract a portion of a string (TString class). All I
> > > > know is that the first character of the portion to be extracted starts
> > > > at position 67. The portion is not constant so I can't use
> > > > TString::Substring (since it looks for a pattern).
> > > >
> > > > I thought there might be a ROOT function that does what I want,
> > > > TString:Strip but I am not sure.
> > > >
> > > > TIA,
> > > > Shawn Kwang
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