Txt file reading and data storing
Hey guys i need some help. I have a txt file which looks like this:
234 56 123 34 456 56 7 45.....
123 3 34 56 56 67 67 2.....
.
.
.
Where each line represents a series of points in coordinate system, and the first number in each line represents the x-point, second y-point,third x-point and so on. I need to read the file, and store the data. I would like to store it in a structure:
struct path {
int x();
int y();
};
I would also need some kind of automatic variable naming for struct path, so when i begin to store second line of points i would have struct name path2. These are just my ideas, so if you can, please help with every approach you can think of. And when the data storing is done i should be able to know the total number of paths and total number of point pairs (x,y) for every path. If you have any ideas please help, i'm a begginer and really need to solve this problem. Thank you in advance!!
Re: Txt file reading and data storing
Quote:
I need to read the file, and store the data. I would like to store it in a structure
That's fine, though you could also consider using a std::pair. However, your example declares a struct named path with two member functions. You would write instead:
Code:
struct path {
int x;
int y;
};
Of course, you would need to store a list of path objects that corresponds to each line of data.
Quote:
I would also need some kind of automatic variable naming for struct path, so when i begin to store second line of points i would have struct name path2.
An array or a std::vector of a list of path objects would be appropriate.
Re: Txt file reading and data storing
Thanks for the reply laserlight. I made a mistake in my first post. I meant:
struct path {
int x[];
int y[];
};
because i have multiple x and y points for every path. How would i use std::pair, considering i have multiple points for every path?
Re: Txt file reading and data storing
Yes, that does make sense. However, then the naming should just change. A path is a series of connected points. A point has a pair of coordinates. Consequently, you could have a Path class that stores a list (e.g., a std::list, std::deque or std::vector) of Point objects. The Point class could be like my example for path, or it could be a typedef for std::pair (but having member variables named x and y would make things easier to understand).
Re: Txt file reading and data storing
Ok, i'll try it with my struct. So what you are suggesting is to have array of structures like:
struct path {
int x[];
int y[];
};
path paths[i];
Am i right? I'm sorry for bugging you but i have more questions. I'm not to familiar with c++ so would you please tell me how would i read i line of numbers in txt file, store them in my structure and recognize EOL?
Re: Txt file reading and data storing
No, more like:
Code:
struct Point
{
int x;
int y;
};
class Path
{
public:
// ...
private:
std::list<Point> points;
};
Variable length arrays are not part of standard C++.
Re: Txt file reading and data storing
If i have class and two vectors as follows:
Code:
class Koord { //varijabla vrijednosti koordinatnih tocaka x i y
public:
double x;
double y;
};
typedef vector<Koord>Tocke; //skup tocaka jednog puta
typedef vector<Tocke>Putovi; //svi putovi mape
Putovi trajektorije(15);
Tocke t(50);
then i read one line of text in stringstream and read doubles from stringstream:
Code:
while (!dat.eof()) {
string tmp;
double x,y;
getline(dat, tmp);
stringstream stmp(tmp);
//cout << "Linija:"<<tmp<<endl;
int p=0;
int &pp = p;
while (stmp >> x >> y) {
how can i store x and y point in vector "Tocke t"? Is it possible to do it with push_back? I have no idea on how to do this. If i set the size of vector (and i wouldn't like to because i then loose the meaning of using vectors) the whole vector will be filled with zeroes or some random memory junk. Is there any other way of doing this?
