reading txt file. How do I FAST read the data?

Hi everybody :)
I wrote a program that reads from txt. But it takes to much time to read the data. My txt file contains following information:
=====Traces=====
10:18:18.176 -> 52 1 0 -1 -690 1000 0 100 0 690 1000 0 100
10:18:18.285 -> 52 1 0 -1 -490 1000 0 100 0 6904 1000 0 100
10:18:18.394 -> 52 1 0 -1 -690 1000 0 100 0 690 1000 0 100
...
I have to convert this numbers to integer. my function does it like this:

after I read the position of whitespaces

leerzeichen is an array that contains a position of whitespaces of the line(zeile).
...

Code:

---

ostringstream sLength,sType,sTimestamp,sX1,sX2,sY1,sY2,sZ1,sZ2,sDy1,sDy2,sConf1,sConf2;
                                for(i=0;i<sizeof(zeile);i++){ // TAKES TO MUCH TIME!!!
                                        if(i>leerzeichen[1] && i<leerzeichen[2])
                                                sLength<<zeile[i];
                                        else if(i>leerzeichen[2] && i<leerzeichen[3])
                                                sType<<zeile[i];
                                        else if(i>leerzeichen[3] && i<leerzeichen[4])
                                                sTimestamp<<zeile[i];
                                        else if(i>leerzeichen[4] && i<leerzeichen[5])
                                                sX1<<zeile[i];
                                        else if(i>leerzeichen[5] && i<leerzeichen[6])
                                                sX2<<zeile[i];
                                        else if(i>leerzeichen[6] && i<leerzeichen[7])
                                                sY1<<zeile[i];
                                        else if(i>leerzeichen[7] && i<leerzeichen[8])
                                                sY2<<zeile[i];
                                        else if(i>leerzeichen[8] && i<leerzeichen[9])
                                                sZ1<<zeile[i];
                                        else if(i>leerzeichen[9] && i<leerzeichen[10])
                                                sZ2<<zeile[i];
                                        else if(i>leerzeichen[10] && i<leerzeichen[11])
                                                sDy1<<zeile[i];
                                        else if(i>leerzeichen[11] && i<leerzeichen[12])
                                                sDy2<<zeile[i];
                                        else if(i>leerzeichen[12] && i<leerzeichen[13])
                                                sConf1<<zeile[i];
                                        else if(i>leerzeichen[13])
                                                sConf2<<zeile[i];
                                }
                                string temp=sLength.str();
                                t_length=atoi(temp.c_str());
                                temp=sType.str();
                                t_type=atoi(temp.c_str());
                                temp=sTimestamp.str();
                                t_timestamp=atoi(temp.c_str());
                                temp=sX1.str();
                                t_x1=atoi(temp.c_str());
                                temp=sX2.str();
                                t_x2=atoi(temp.c_str());
                                temp=sY1.str();
                                t_y1=atoi(temp.c_str());
                                temp=sY2.str();
                                t_y2=atoi(temp.c_str());
                                temp=sZ1.str();
                                t_z1=atoi(temp.c_str());
                                temp=sZ2.str();
                                t_z2=atoi(temp.c_str());
                                temp=sDy1.str();
                                t_dy1=atoi(temp.c_str());
                                temp=sDy2.str();
                                t_dy2=atoi(temp.c_str());
                                temp=sConf1.str();
                                t_conf1=atoi(temp.c_str());
                                temp=sConf2.str();
                                t_conf2=atoi(temp.c_str());

---

the problem is that sstream, it takes along time. How can i fix that problem? Any ideas?

Thank you :)

Please:

1. Use Code tags while posting code snippets.
2. Don't declare variables as a comma separated list! One variable - one line.
3. Use white spaces between operands.

Otherwise your code becomes absolutely unreadable!

As for more fast reading - just read the whole line and only then parse it.

im sorry about that :)

Im new in this forum. Next time I'll do this right.

ps: can't find edit button on the thread :S

If all the liens have the same amount of values, you can read directly into
the variables without reading in the line and then using stringstream:

Code:

---

  const int nValues = 13;
 
  string date_time , arrow;
  int    values[nValues];
 

  ifstream in("data.txt");
 
  while (in >> date_time >> arrow)
  {
    for (int i=0; i<nValues; ++i)
    {
      in >> values[i];
    }
  }

---

Thank you for quick reply Philip,
I dont really understand the line "in >> date_time >> arrow"

I have also a compiler error
"error C2678: binary '>>' : no operator defined which takes a left-hand operand of type 'class ifstream' (or there is no acceptable conversion)"

Can you post the code that gives the error (with the declarations
of the types of variables).

I used the same code that you have posted.

Do you have all the proper includes ? Can you test this code stand-alone ?

Code:

---

#include <fstream>
#include <string>

using namespace std;

int main()
{ 
  const int nValues = 13;
 
  string date_time , arrow;
  int    values[nValues];
 

  ifstream in("data.txt");
 
  while (in >> date_time >> arrow)
  {
    for (int i=0; i<nValues; ++i)
    {
      in >> values[i];
    }
  }
 
  return 0;
}

---

It works, if I test the code in separate project.
But inside a function of my class it doesen't work any more. But what is a sense of this line?
in >> date_time >> arrow
im still trying to understand that. But I dont get it

It is just standard C++ operator >> ...

Does your project include <string> and <fstream> ? (with .h extensions ?)

using namespace std; ??

See http://www.codeguru.com/forum/showthread.php?t=507380
for a similar issue and solution hints

yes its includes <fstream.h>

I dont know why but this was a problem. Thank you very much Philip.

I will try to use this in my project. :)

<fstream.h> is the old header from before the C++ standard in 1998.

It looks like your version of fstream.h does not have an overload to read into a std::string.

You could change the variables, date_time and arrow from std::string to

Code:

---

char date_time[20];
char arrow[20];

---

if changing to <fstream> is not feasible.