reading data from text file

[Santah]

hi
I'm new to C++
and I'm currently working on Visual C++ 6.0

I'm trying to open a text file, and read some data from it

part of the text file looks like this:

--------

Stoichiometry C3H7NO
Framework group C1[X(C3H7NO)]
Deg. of freedom 30
Full point group C1 NOp 1
Largest Abelian subgroup C1 NOp 1
Largest concise Abelian subgroup C1 NOp 1
Standard orientation:
---------------------------------------------------------------------
Center Atomic Atomic Coordinates (Angstroms)
Number Number Type X Y Z
---------------------------------------------------------------------
1 7 0 -0.471842 1.385033 -0.179367
2 6 0 -0.441998 0.034984 0.352626
3 1 0 -0.532368 0.028578 1.492181
4 6 0 0.817945 -0.768835 0.128492
5 8 0 1.897598 -0.056037 -0.129721
6 6 0 -1.600140 -0.811575 -0.187269
7 1 0 -1.521476 -1.844231 0.228333
8 1 0 -2.577732 -0.368082 0.117451
9 1 0 -1.563751 -0.866827 -1.300932
10 1 0 0.330252 1.899884 0.122288
11 1 0 -1.306000 1.857479 0.102977
12 1 0 2.638344 -0.681170 -0.232052
---------------------------------------------------------------------
Rotational constants (GHZ): 8.3231162 3.9152127
2.8710745
Isotopes: N-14,C-12,H-1,C-12,O-16,C-12,H-1,H-1,H-1,H-1,H-1,H-1
Standard basis: VSTO-3G (5D, 7F)
There are 27 symmetry adapted basis functions of A symmetry.
Crude estimate of integral set expansion from redundant
integrals=1.000 .

--------


what I need, is the values:

1 7 0 -0.471842 1.385033 -0.179367
2 6 0 -0.441998 0.034984 0.352626
3 1 0 -0.532368 0.028578 1.492181
4 6 0 0.817945 -0.768835 0.128492
5 8 0 1.897598 -0.056037 -0.129721
6 6 0 -1.600140 -0.811575 -0.187269
7 1 0 -1.521476 -1.844231 0.228333
8 1 0 -2.577732 -0.368082 0.117451
9 1 0 -1.563751 -0.866827 -1.300932
10 1 0 0.330252 1.899884 0.122288
11 1 0 -1.306000 1.857479 0.102977
12 1 0 2.638344 -0.681170 -0.232052


but I don't know how to fetch them :(

here's what I've done so far .... (I know that it's not good nor
working :))

CFile file1("test.txt ", CFile::modeRead );
DWORD dwLen = file1.GetLength ();

char *pbuf = new char[dwLen] ;

ffile1.ReadHuge ( pbuf, dwLen );

CString sText(pbuf);

delete []pbuf;
// sText.Find("Sta ndard orientation:");


so I have the whole file in a string, and now I need only to get the
needed values from the string but I don't know how:(

any help is welcomed :))

[zot]

Re: reading data from text file

Has the visual c++
a class to find regular expression similar to QT's regexp?
If so you can use it.
If not:
Another point: probably it's better to fetch the file one line at a time.
You can use the standard funtions : readline.
Now you can write a function that fetches
a floating number startinng from a char* (the ponter to the string),
and stores it in a double var.
This function should return error if it is impossible to parse the number.
Suppose you call it f(char*,double) .
If it is impossible to fetch a number of int equal to the
number of columns in your table then you are parsing a bad line ( a line
extraneous to the table):

Now you can write a loop:


for(int i=0; i < NUMBER OF COL; i++)
if ( f(string,number )== error)
continue on next line;

Hope this help.
I have assumed you can write such a function, but if you want I can write it
next time.
Sorry but I haven't so much time at the moment....



"Santah" <slice17@yahoo. com> ha scritto nel messaggio
news:ed9bdbcb.0 307272339.3d78e d64@posting.goo gle.com...[color=blue]
> hi
> I'm new to C++
> and I'm currently working on Visual C++ 6.0
>
> I'm trying to open a text file, and read some data from it
>
> part of the text file looks like this:
>
> --------
>
> Stoichiometry C3H7NO
> Framework group C1[X(C3H7NO)]
> Deg. of freedom 30
> Full point group C1 NOp 1
> Largest Abelian subgroup C1 NOp 1
> Largest concise Abelian subgroup C1 NOp 1
> Standard orientation:
> ---------------------------------------------------------------------
> Center Atomic Atomic Coordinates (Angstroms)
> Number Number Type X Y Z
> ---------------------------------------------------------------------
> 1 7 0 -0.471842 1.385033 -0.179367
> 2 6 0 -0.441998 0.034984 0.352626
> 3 1 0 -0.532368 0.028578 1.492181
> 4 6 0 0.817945 -0.768835 0.128492
> 5 8 0 1.897598 -0.056037 -0.129721
> 6 6 0 -1.600140 -0.811575 -0.187269
> 7 1 0 -1.521476 -1.844231 0.228333
> 8 1 0 -2.577732 -0.368082 0.117451
> 9 1 0 -1.563751 -0.866827 -1.300932
> 10 1 0 0.330252 1.899884 0.122288
> 11 1 0 -1.306000 1.857479 0.102977
> 12 1 0 2.638344 -0.681170 -0.232052
> ---------------------------------------------------------------------
> Rotational constants (GHZ): 8.3231162 3.9152127
> 2.8710745
> Isotopes: N-14,C-12,H-1,C-12,O-16,C-12,H-1,H-1,H-1,H-1,H-1,H-1
> Standard basis: VSTO-3G (5D, 7F)
> There are 27 symmetry adapted basis functions of A symmetry.
> Crude estimate of integral set expansion from redundant
> integrals=1.000 .
>
> --------
>
>
> what I need, is the values:
>
> 1 7 0 -0.471842 1.385033 -0.179367
> 2 6 0 -0.441998 0.034984 0.352626
> 3 1 0 -0.532368 0.028578 1.492181
> 4 6 0 0.817945 -0.768835 0.128492
> 5 8 0 1.897598 -0.056037 -0.129721
> 6 6 0 -1.600140 -0.811575 -0.187269
> 7 1 0 -1.521476 -1.844231 0.228333
> 8 1 0 -2.577732 -0.368082 0.117451
> 9 1 0 -1.563751 -0.866827 -1.300932
> 10 1 0 0.330252 1.899884 0.122288
> 11 1 0 -1.306000 1.857479 0.102977
> 12 1 0 2.638344 -0.681170 -0.232052
>
>
> but I don't know how to fetch them :(
>
> here's what I've done so far .... (I know that it's not good nor
> working :))
>
> CFile file1("test.txt ", CFile::modeRead );
> DWORD dwLen = file1.GetLength ();
>
> char *pbuf = new char[dwLen] ;
>
> ffile1.ReadHuge ( pbuf, dwLen );
>
> CString sText(pbuf);
>
> delete []pbuf;
> // sText.Find("Sta ndard orientation:");
>
>
> so I have the whole file in a string, and now I need only to get the
> needed values from the string but I don't know how:(
>
> any help is welcomed :))[/color]

[Thomas Matthews]

Re: reading data from text file

zot wrote:
1. Don't top-post.[color=blue]
> Has the visual c++
> a class to find regular expression similar to QT's regexp?
> If so you can use it.
> If not:
> Another point: probably it's better to fetch the file one line at a time.
> You can use the standard funtions : readline.[/color]
readline is not a standard function. If it is, please quote where
in the C++ specification that you found it.
There is a function, std::getline(), which is part of the Standard
Template Library.

[color=blue]
> Now you can write a function that fetches
> a floating number startinng from a char* (the ponter to the string),
> and stores it in a double var.[/color]
One could use the stringstream functions too.
Or even sscanf().
[color=blue]
> This function should return error if it is impossible to parse the number.
> Suppose you call it f(char*,double) .
> If it is impossible to fetch a number of int equal to the
> number of columns in your table then you are parsing a bad line ( a line
> extraneous to the table):[/color]
But why write a function when one is available?
[color=blue]
>
> Now you can write a loop:
>
>
> for(int i=0; i < NUMBER OF COL; i++)
> if ( f(string,number )== error)
> continue on next line;
>
> Hope this help.
> I have assumed you can write such a function, but if you want I can write it
> next time.
> Sorry but I haven't so much time at the moment....
>
>
>
> "Santah" <slice17@yahoo. com> ha scritto nel messaggio
> news:ed9bdbcb.0 307272339.3d78e d64@posting.goo gle.com...
>[/color]

--
Thomas Matthews

C++ newsgroup welcome message:

http://www.slack.net/~shiva/welcome.txt

C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.l earn.c-c++ faq:

http://www.raos.demon.uk/acllc-c++/faq.html

Other sites:
http://www.josuttis.com -- C++ STL Library book

[Santah]

Re: reading data from text file

Thomas Matthews <Thomas_Matthew sHatesSpam@sbcg lobal.net> wrote in message news:<i%bVa.134 38$9M4.37360047 51@newssvr10.ne ws.prodigy.com> ...[color=blue]
> Santah wrote:
>[color=green]
> > hi
> > I'm new to C++
> > and I'm currently working on Visual C++ 6.0
> >
> > I'm trying to open a text file, and read some data from it
> >
> > part of the text file looks like this:
> >
> > --------
> >
> > Stoichiometry C3H7NO
> > Framework group C1[X(C3H7NO)]
> > Deg. of freedom 30
> > Full point group C1 NOp 1
> > Largest Abelian subgroup C1 NOp 1
> > Largest concise Abelian subgroup C1 NOp 1
> > Standard orientation:
> > ---------------------------------------------------------------------
> > Center Atomic Atomic Coordinates (Angstroms)
> > Number Number Type X Y Z
> > ---------------------------------------------------------------------
> > 1 7 0 -0.471842 1.385033 -0.179367
> > 2 6 0 -0.441998 0.034984 0.352626
> > 3 1 0 -0.532368 0.028578 1.492181
> > 4 6 0 0.817945 -0.768835 0.128492
> > 5 8 0 1.897598 -0.056037 -0.129721
> > 6 6 0 -1.600140 -0.811575 -0.187269
> > 7 1 0 -1.521476 -1.844231 0.228333
> > 8 1 0 -2.577732 -0.368082 0.117451
> > 9 1 0 -1.563751 -0.866827 -1.300932
> > 10 1 0 0.330252 1.899884 0.122288
> > 11 1 0 -1.306000 1.857479 0.102977
> > 12 1 0 2.638344 -0.681170 -0.232052
> > ---------------------------------------------------------------------
> > Rotational constants (GHZ): 8.3231162 3.9152127
> > 2.8710745
> > Isotopes: N-14,C-12,H-1,C-12,O-16,C-12,H-1,H-1,H-1,H-1,H-1,H-1
> > Standard basis: VSTO-3G (5D, 7F)
> > There are 27 symmetry adapted basis functions of A symmetry.
> > Crude estimate of integral set expansion from redundant
> > integrals=1.000 .
> >
> > --------
> >
> >
> > what I need, is the values:
> >
> > 1 7 0 -0.471842 1.385033 -0.179367
> > 2 6 0 -0.441998 0.034984 0.352626
> > 3 1 0 -0.532368 0.028578 1.492181
> > 4 6 0 0.817945 -0.768835 0.128492
> > 5 8 0 1.897598 -0.056037 -0.129721
> > 6 6 0 -1.600140 -0.811575 -0.187269
> > 7 1 0 -1.521476 -1.844231 0.228333
> > 8 1 0 -2.577732 -0.368082 0.117451
> > 9 1 0 -1.563751 -0.866827 -1.300932
> > 10 1 0 0.330252 1.899884 0.122288
> > 11 1 0 -1.306000 1.857479 0.102977
> > 12 1 0 2.638344 -0.681170 -0.232052
> >
> >
> > but I don't know how to fetch them :(
> >
> > here's what I've done so far .... (I know that it's not good nor
> > working :))
> >
> > CFile file1("test.txt ", CFile::modeRead );
> > DWORD dwLen = file1.GetLength ();
> >
> > char *pbuf = new char[dwLen] ;
> >
> > ffile1.ReadHuge ( pbuf, dwLen );
> >
> > CString sText(pbuf);
> >
> > delete []pbuf;
> > // sText.Find("Sta ndard orientation:");
> >
> >
> > so I have the whole file in a string, and now I need only to get the
> > needed values from the string but I don't know how:(
> >
> > any help is welcomed :))[/color]
>
> I'm in a good mood, so here is a foundation. :-)
>
> #include <fstream>
> #include <string>
> #include <cstdlib>
> using std::ifstream;
> using std::string;
> using std::getline;
> using std::cerr;
>
> int main(void)
> {
> ifstream inp_data("test. txt"); // ifstream defaults to text files
> if (!inp_data)
> {
> cerr << "Error opening 'test.txt'\n";
> return EXIT_FAILURE;
> }
>
> //------------------------------------------------------------
> // Skip past all the junk.
> //------------------------------------------------------------
> string text_line;
> unsigned int dashed_line_cou nt = 2;
> while (getline(inp_da ta, text_line, '\n'))
> {
> if ((text_line.len gth() > 1)
> && (text_line[0] == '-'))
> {
> --dashed_line_cou nt;
> if (dashed_line_co unt == 0)
> break;
> }
> }
>
> if (!inp_data || (dashed_line_co unt > 0))
> {
> cerr << "Data table not found.\n";
> return EXIT_FAILURE;
> }
>
> //------------------------------------------------------------
> // At this point, the next text line should be the
> // first row of data.
> //------------------------------------------------------------
> unsigned int center_number;
> unsigned int atomic_number;
> unsigned int atomic_type;
> double x_ord;
> double y_ord;
> double z_ord;
> while (inp_data >> center_number)
> {
> inp_data >> atomic_number >> atomic_type[color=green][color=darkred]
> >> x_ord >> y_ord >> z_ord;[/color][/color]
> Process_The_Dat a(center_number , atomic_number, atomic_type,
> x_ord, y_ord, z_ord);
> }
> return EXIT_SUCCESS;
> }
>
>
> Look Ma, no $#@!&*# MFC library required.
> And its portable too.
> {The code above has not been compiled nor tested.}
>
> --
> Thomas Matthews
>
> C++ newsgroup welcome message:
> http://www.slack.net/~shiva/welcome.txt
> C++ Faq: http://www.parashift.com/c++-faq-lite
> C Faq: http://www.eskimo.com/~scs/c-faq/top.html
> alt.comp.lang.l earn.c-c++ faq:
> http://www.raos.demon.uk/acllc-c++/faq.html
> Other sites:
> http://www.josuttis.com -- C++ STL Library book[/color]



thanks that you took the time to try to help me, but....
I can't make your source work ...
because:
1. I haven't seen anywhere in your source the string "Standard
Orientation", and that is the keystring wich I should use to locate
the table, because the text file is not with a fixed rows, and there
can be many things above that table, but when there is the "Standard
Orientation" string, I know that the table follows.....
2. The way you added values to those variables (atomic_number etc.)
are they arrays or single values? because I need all the values from
the table stored....

sorry if I missunderstood something, I'm not that good in programming,
and thanks again for taking the time to read this :) bye

[Karl Heinz Buchegger]

Re: reading data from text file



Karl Heinz Buchegger wrote:[color=blue]
>[/color]
[snip][color=blue]
> then one could use (referring to Mathews code again)[/color]

Apologies to Thomas.
When writing the reply I was under the impression that your
first name is Mathews, while in fact Matthews is your surname
and is spelled differently.

--
Karl Heinz Buchegger
kbuchegg@gascad .at

[Thomas Matthews]

Re: reading data from text file

Santah wrote:[color=blue]
> Thomas Matthews <Thomas_Matthew sHatesSpam@sbcg lobal.net> wrote in message news:<i%bVa.134 38$9M4.37360047 51@newssvr10.ne ws.prodigy.com> ...
>[color=green]
>>Santah wrote:
>>
>>[color=darkred]
>>>hi
>>>I'm new to C++
>>>and I'm currently working on Visual C++ 6.0
>>>
>>>I'm trying to open a text file, and read some data from it
>>>
>>>part of the text file looks like this:
>>>
>>>--------
>>>
>>>Stoichiometr y C3H7NO
>>> Framework group C1[X(C3H7NO)]
>>> Deg. of freedom 30
>>> Full point group C1 NOp 1
>>> Largest Abelian subgroup C1 NOp 1
>>> Largest concise Abelian subgroup C1 NOp 1
>>> Standard orientation:
>>> ---------------------------------------------------------------------
>>> Center Atomic Atomic Coordinates (Angstroms)
>>> Number Number Type X Y Z
>>> ---------------------------------------------------------------------
>>> 1 7 0 -0.471842 1.385033 -0.179367
>>> 2 6 0 -0.441998 0.034984 0.352626
>>> 3 1 0 -0.532368 0.028578 1.492181
>>> 4 6 0 0.817945 -0.768835 0.128492
>>> 5 8 0 1.897598 -0.056037 -0.129721
>>> 6 6 0 -1.600140 -0.811575 -0.187269
>>> 7 1 0 -1.521476 -1.844231 0.228333
>>> 8 1 0 -2.577732 -0.368082 0.117451
>>> 9 1 0 -1.563751 -0.866827 -1.300932
>>> 10 1 0 0.330252 1.899884 0.122288
>>> 11 1 0 -1.306000 1.857479 0.102977
>>> 12 1 0 2.638344 -0.681170 -0.232052
>>> ---------------------------------------------------------------------
>>> Rotational constants (GHZ): 8.3231162 3.9152127
>>>2.8710745
>>> Isotopes: N-14,C-12,H-1,C-12,O-16,C-12,H-1,H-1,H-1,H-1,H-1,H-1
>>> Standard basis: VSTO-3G (5D, 7F)
>>> There are 27 symmetry adapted basis functions of A symmetry.
>>> Crude estimate of integral set expansion from redundant
>>>integrals=1. 000.
>>>
>>>--------
>>>
>>>
>>>what I need, is the values:
>>>
>>> 1 7 0 -0.471842 1.385033 -0.179367
>>> 2 6 0 -0.441998 0.034984 0.352626
>>> 3 1 0 -0.532368 0.028578 1.492181
>>> 4 6 0 0.817945 -0.768835 0.128492
>>> 5 8 0 1.897598 -0.056037 -0.129721
>>> 6 6 0 -1.600140 -0.811575 -0.187269
>>> 7 1 0 -1.521476 -1.844231 0.228333
>>> 8 1 0 -2.577732 -0.368082 0.117451
>>> 9 1 0 -1.563751 -0.866827 -1.300932
>>> 10 1 0 0.330252 1.899884 0.122288
>>> 11 1 0 -1.306000 1.857479 0.102977
>>> 12 1 0 2.638344 -0.681170 -0.232052
>>>
>>>
>>>but I don't know how to fetch them :(
>>>
>>>here's what I've done so far .... (I know that it's not good nor
>>>working :))
>>>
>>> CFile file1("test.txt ", CFile::modeRead );
>>> DWORD dwLen = file1.GetLength ();
>>>
>>> char *pbuf = new char[dwLen] ;
>>>
>>> ffile1.ReadHuge ( pbuf, dwLen );
>>>
>>> CString sText(pbuf);
>>>
>>> delete []pbuf;
>>>// sText.Find("Sta ndard orientation:");
>>>
>>>
>>>so I have the whole file in a string, and now I need only to get the
>>>needed values from the string but I don't know how:(
>>>
>>>any help is welcomed :))[/color]
>>
>>I'm in a good mood, so here is a foundation. :-)
>>
>>#include <fstream>
>>#include <string>
>>#include <cstdlib>
>>using std::ifstream;
>>using std::string;
>>using std::getline;
>>using std::cerr;
>>
>>int main(void)
>>{
>> ifstream inp_data("test. txt"); // ifstream defaults to text files
>> if (!inp_data)
>> {
>> cerr << "Error opening 'test.txt'\n";
>> return EXIT_FAILURE;
>> }
>>
>>//------------------------------------------------------------
>>// Skip past all the junk.
>>//------------------------------------------------------------
>> string text_line;
>> unsigned int dashed_line_cou nt = 2;
>> while (getline(inp_da ta, text_line, '\n'))
>> {
>> if ((text_line.len gth() > 1)
>> && (text_line[0] == '-'))
>> {
>> --dashed_line_cou nt;
>> if (dashed_line_co unt == 0)
>> break;
>> }
>> }
>>
>> if (!inp_data || (dashed_line_co unt > 0))
>> {
>> cerr << "Data table not found.\n";
>> return EXIT_FAILURE;
>> }
>>
>>//------------------------------------------------------------
>>// At this point, the next text line should be the
>>// first row of data.
>>//------------------------------------------------------------
>> unsigned int center_number;
>> unsigned int atomic_number;
>> unsigned int atomic_type;
>> double x_ord;
>> double y_ord;
>> double z_ord;
>> while (inp_data >> center_number)
>> {
>> inp_data >> atomic_number >> atomic_type[color=darkred]
>> >> x_ord >> y_ord >> z_ord;[/color]
>> Process_The_Dat a(center_number , atomic_number, atomic_type,
>> x_ord, y_ord, z_ord);
>> }
>> return EXIT_SUCCESS;
>>}
>>
>>
>>Look Ma, no $#@!&*# MFC library required.
>>And its portable too.
>>{The code above has not been compiled nor tested.}
>>
>>--
>>Thomas Matthews
>>
>>C++ newsgroup welcome message:
>> http://www.slack.net/~shiva/welcome.txt
>>C++ Faq: http://www.parashift.com/c++-faq-lite
>>C Faq: http://www.eskimo.com/~scs/c-faq/top.html
>>alt.comp.lang .learn.c-c++ faq:
>> http://www.raos.demon.uk/acllc-c++/faq.html
>>Other sites:
>> http://www.josuttis.com -- C++ STL Library book[/color]
>
>
>
>
> thanks that you took the time to try to help me, but....
> I can't make your source work ...
> because:
> 1. I haven't seen anywhere in your source the string "Standard
> Orientation", and that is the keystring wich I should use to locate
> the table, because the text file is not with a fixed rows, and there
> can be many things above that table, but when there is the "Standard
> Orientation" string, I know that the table follows.....[/color]
Instead of comparing the text line read in to a '-',
use the find() method of std::string to search for "Standard
Orientation". That loop ignores all text until a marker is found.
[color=blue]
> 2. The way you added values to those variables (atomic_number etc.)
> are they arrays or single values? because I need all the values from
> the table stored....[/color]
If you need _all_ the values stored before processing, then create
a structure and use a vector of the structure:
struct Atomic_Record
{
unsigned int center_number;
unsigned int atomic_number;
//... and so on
};

#include <vector>
using std::vector;

typedef vector<Atomic_R ecord> Atomic_Vector;
Atomic_Vector atom_info;

//----------------------------
The input fragment will look like:
Atomic_Record inp_record;
while (inp_data >> inp_record.cent er_number)
{
// Fill in the fields of the structure
inp_data >> inp_record.atom ic_number[color=blue][color=green]
>> inp_record.atom ic_type[/color][/color]
// and so on ...[color=blue][color=green]
>> inp_record.z_or d;[/color][/color]

// Save the record in the array:
atom_info.push_ back(inp_record );
}
[color=blue]
>
> sorry if I missunderstood something, I'm not that good in programming,
> and thanks again for taking the time to read this :) bye[/color]

A better method would be to overload the operator>> (stream
extraction) for the Atomic_Record structure and use that.
With the overloaded operator, your input loop is simplified as:
while (inp_data >> inp_record)
{
atom_info.push_ back(inp_record );
}

Now, I am not writing your program for you, but illustrating some
concepts, such as searching for a key string and reading variables
from a text file. Your challenge is to adapt this information
for your needs.

Read the FAQ and welcome.txt below for some great information.

By the way, do the world a favor and don't prefix your
structure and class names with a 'C' or 'T'. These are
the nomenclature for Microsoft and Borland libraries.
Be more creative.

--
Thomas Matthews

C++ newsgroup welcome message:

http://www.slack.net/~shiva/welcome.txt

C++ Faq: http://www.parashift.com/c++-faq-lite
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alt.comp.lang.l earn.c-c++ faq:

http://www.raos.demon.uk/acllc-c++/faq.html

Other sites:
http://www.josuttis.com -- C++ STL Library book

[Thomas Matthews]

Re: reading data from text file

Karl Heinz Buchegger wrote:[color=blue]
>
> Karl Heinz Buchegger wrote:
>
> [snip]
>[color=green]
>>then one could use (referring to Mathews code again)[/color]
>
>
> Apologies to Thomas.
> When writing the reply I was under the impression that your
> first name is Mathews, while in fact Matthews is your surname
> and is spelled differently.
>[/color]

Apology accepted.

--
Thomas Matthews

C++ newsgroup welcome message:

http://www.slack.net/~shiva/welcome.txt

C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.l earn.c-c++ faq:

http://www.raos.demon.uk/acllc-c++/faq.html

Other sites:
http://www.josuttis.com -- C++ STL Library book

[Santah]

Re: reading data from text file

Thomas Matthews <Thomas_Matthew sHatesSpam@sbcg lobal.net> wrote in message news:<OlvVa.136 02$hZ3.37974713 48@newssvr10.ne ws.prodigy.com> ...[color=blue]
> Santah wrote:[color=green]
> > Thomas Matthews <Thomas_Matthew sHatesSpam@sbcg lobal.net> wrote in message news:<i%bVa.134 38$9M4.37360047 51@newssvr10.ne ws.prodigy.com> ...
> >[color=darkred]
> >>Santah wrote:
> >>
> >>
> >>>hi
> >>>I'm new to C++
> >>>and I'm currently working on Visual C++ 6.0
> >>>
> >>>I'm trying to open a text file, and read some data from it
> >>>
> >>>part of the text file looks like this:
> >>>
> >>>--------
> >>>
> >>>Stoichiometr y C3H7NO
> >>> Framework group C1[X(C3H7NO)]
> >>> Deg. of freedom 30
> >>> Full point group C1 NOp 1
> >>> Largest Abelian subgroup C1 NOp 1
> >>> Largest concise Abelian subgroup C1 NOp 1
> >>> Standard orientation:
> >>> ---------------------------------------------------------------------
> >>> Center Atomic Atomic Coordinates (Angstroms)
> >>> Number Number Type X Y Z
> >>> ---------------------------------------------------------------------
> >>> 1 7 0 -0.471842 1.385033 -0.179367
> >>> 2 6 0 -0.441998 0.034984 0.352626
> >>> 3 1 0 -0.532368 0.028578 1.492181
> >>> 4 6 0 0.817945 -0.768835 0.128492
> >>> 5 8 0 1.897598 -0.056037 -0.129721
> >>> 6 6 0 -1.600140 -0.811575 -0.187269
> >>> 7 1 0 -1.521476 -1.844231 0.228333
> >>> 8 1 0 -2.577732 -0.368082 0.117451
> >>> 9 1 0 -1.563751 -0.866827 -1.300932
> >>> 10 1 0 0.330252 1.899884 0.122288
> >>> 11 1 0 -1.306000 1.857479 0.102977
> >>> 12 1 0 2.638344 -0.681170 -0.232052
> >>> ---------------------------------------------------------------------
> >>> Rotational constants (GHZ): 8.3231162 3.9152127
> >>>2.8710745
> >>> Isotopes: N-14,C-12,H-1,C-12,O-16,C-12,H-1,H-1,H-1,H-1,H-1,H-1
> >>> Standard basis: VSTO-3G (5D, 7F)
> >>> There are 27 symmetry adapted basis functions of A symmetry.
> >>> Crude estimate of integral set expansion from redundant
> >>>integrals=1. 000.
> >>>
> >>>--------
> >>>
> >>>
> >>>what I need, is the values:
> >>>
> >>> 1 7 0 -0.471842 1.385033 -0.179367
> >>> 2 6 0 -0.441998 0.034984 0.352626
> >>> 3 1 0 -0.532368 0.028578 1.492181
> >>> 4 6 0 0.817945 -0.768835 0.128492
> >>> 5 8 0 1.897598 -0.056037 -0.129721
> >>> 6 6 0 -1.600140 -0.811575 -0.187269
> >>> 7 1 0 -1.521476 -1.844231 0.228333
> >>> 8 1 0 -2.577732 -0.368082 0.117451
> >>> 9 1 0 -1.563751 -0.866827 -1.300932
> >>> 10 1 0 0.330252 1.899884 0.122288
> >>> 11 1 0 -1.306000 1.857479 0.102977
> >>> 12 1 0 2.638344 -0.681170 -0.232052
> >>>
> >>>
> >>>but I don't know how to fetch them :(
> >>>
> >>>here's what I've done so far .... (I know that it's not good nor
> >>>working :))
> >>>
> >>> CFile file1("test.txt ", CFile::modeRead );
> >>> DWORD dwLen = file1.GetLength ();
> >>>
> >>> char *pbuf = new char[dwLen] ;
> >>>
> >>> ffile1.ReadHuge ( pbuf, dwLen );
> >>>
> >>> CString sText(pbuf);
> >>>
> >>> delete []pbuf;
> >>>// sText.Find("Sta ndard orientation:");
> >>>
> >>>
> >>>so I have the whole file in a string, and now I need only to get the
> >>>needed values from the string but I don't know how:(
> >>>
> >>>any help is welcomed :))
> >>
> >>I'm in a good mood, so here is a foundation. :-)
> >>
> >>#include <fstream>
> >>#include <string>
> >>#include <cstdlib>
> >>using std::ifstream;
> >>using std::string;
> >>using std::getline;
> >>using std::cerr;
> >>
> >>int main(void)
> >>{
> >> ifstream inp_data("test. txt"); // ifstream defaults to text files
> >> if (!inp_data)
> >> {
> >> cerr << "Error opening 'test.txt'\n";
> >> return EXIT_FAILURE;
> >> }
> >>
> >>//------------------------------------------------------------
> >>// Skip past all the junk.
> >>//------------------------------------------------------------
> >> string text_line;
> >> unsigned int dashed_line_cou nt = 2;
> >> while (getline(inp_da ta, text_line, '\n'))
> >> {
> >> if ((text_line.len gth() > 1)
> >> && (text_line[0] == '-'))
> >> {
> >> --dashed_line_cou nt;
> >> if (dashed_line_co unt == 0)
> >> break;
> >> }
> >> }
> >>
> >> if (!inp_data || (dashed_line_co unt > 0))
> >> {
> >> cerr << "Data table not found.\n";
> >> return EXIT_FAILURE;
> >> }
> >>
> >>//------------------------------------------------------------
> >>// At this point, the next text line should be the
> >>// first row of data.
> >>//------------------------------------------------------------
> >> unsigned int center_number;
> >> unsigned int atomic_number;
> >> unsigned int atomic_type;
> >> double x_ord;
> >> double y_ord;
> >> double z_ord;
> >> while (inp_data >> center_number)
> >> {
> >> inp_data >> atomic_number >> atomic_type
> >> >> x_ord >> y_ord >> z_ord;
> >> Process_The_Dat a(center_number , atomic_number, atomic_type,
> >> x_ord, y_ord, z_ord);
> >> }
> >> return EXIT_SUCCESS;
> >>}
> >>
> >>
> >>Look Ma, no $#@!&*# MFC library required.
> >>And its portable too.
> >>{The code above has not been compiled nor tested.}
> >>
> >>--
> >>Thomas Matthews
> >>
> >>C++ newsgroup welcome message:
> >> http://www.slack.net/~shiva/welcome.txt
> >>C++ Faq: http://www.parashift.com/c++-faq-lite
> >>C Faq: http://www.eskimo.com/~scs/c-faq/top.html
> >>alt.comp.lang .learn.c-c++ faq:
> >> http://www.raos.demon.uk/acllc-c++/faq.html
> >>Other sites:
> >> http://www.josuttis.com -- C++ STL Library book[/color]
> >
> >
> >
> >
> > thanks that you took the time to try to help me, but....
> > I can't make your source work ...
> > because:
> > 1. I haven't seen anywhere in your source the string "Standard
> > Orientation", and that is the keystring wich I should use to locate
> > the table, because the text file is not with a fixed rows, and there
> > can be many things above that table, but when there is the "Standard
> > Orientation" string, I know that the table follows.....[/color]
> Instead of comparing the text line read in to a '-',
> use the find() method of std::string to search for "Standard
> Orientation". That loop ignores all text until a marker is found.
>[color=green]
> > 2. The way you added values to those variables (atomic_number etc.)
> > are they arrays or single values? because I need all the values from
> > the table stored....[/color]
> If you need _all_ the values stored before processing, then create
> a structure and use a vector of the structure:
> struct Atomic_Record
> {
> unsigned int center_number;
> unsigned int atomic_number;
> //... and so on
> };
>
> #include <vector>
> using std::vector;
>
> typedef vector<Atomic_R ecord> Atomic_Vector;
> Atomic_Vector atom_info;
>
> //----------------------------
> The input fragment will look like:
> Atomic_Record inp_record;
> while (inp_data >> inp_record.cent er_number)
> {
> // Fill in the fields of the structure
> inp_data >> inp_record.atom ic_number[color=green][color=darkred]
> >> inp_record.atom ic_type[/color][/color]
> // and so on ...[color=green][color=darkred]
> >> inp_record.z_or d;[/color][/color]
>
> // Save the record in the array:
> atom_info.push_ back(inp_record );
> }
>[color=green]
> >
> > sorry if I missunderstood something, I'm not that good in programming,
> > and thanks again for taking the time to read this :) bye[/color]
>
> A better method would be to overload the operator>> (stream
> extraction) for the Atomic_Record structure and use that.
> With the overloaded operator, your input loop is simplified as:
> while (inp_data >> inp_record)
> {
> atom_info.push_ back(inp_record );
> }
>
> Now, I am not writing your program for you, but illustrating some
> concepts, such as searching for a key string and reading variables
> from a text file. Your challenge is to adapt this information
> for your needs.
>
> Read the FAQ and welcome.txt below for some great information.
>
> By the way, do the world a favor and don't prefix your
> structure and class names with a 'C' or 'T'. These are
> the nomenclature for Microsoft and Borland libraries.
> Be more creative.
>
> --
> Thomas Matthews
>
> C++ newsgroup welcome message:
> http://www.slack.net/~shiva/welcome.txt
> C++ Faq: http://www.parashift.com/c++-faq-lite
> C Faq: http://www.eskimo.com/~scs/c-faq/top.html
> alt.comp.lang.l earn.c-c++ faq:
> http://www.raos.demon.uk/acllc-c++/faq.html
> Other sites:
> http://www.josuttis.com -- C++ STL Library book[/color]



"By the way, do the world a favor and don't prefix your
structure and class names with a 'C' or 'T'. These are
the nomenclature for Microsoft and Borland libraries.
Be more creative."

I'm not doing it, and I'm against it too
If I had pasted some code with class names with "c" or "t" it's
because the code was not mine and I adapted it :))

thanks for the help ...