File reading error.........grin

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Started by XaOs October 16, 2001 05:18 AM

7 comments, last by XaOs 22 years, 6 months ago

122

Author

October 16, 2001 05:18 AM

Hi!! This is probably the most stupid post i will ever do, and the sollution is probably so easy that i can't see it... But here we go.... FILE *file = NULL; (...) file = fopen ("blabla.txt", "r"); for (x=0; x<10; x++) { fscanf (file, "%f,", &xpos); } fclose (file) ...(or close(file)...don't remeber right now))!!

This gives me an error! It won't compile!! What am i doing wrong here...????? This used to work for me before...but it won't do it now! Any help would be appreciated!

(BTW : The file contains floats.... i.e : 1.0, 1.0, 1.0, ...10 times...)(forgot to add) Thanks! Take Care! - -- ---[XaOs]--- -- - [ project fy ] Edited by - XaOs on October 16, 2001 6:20:33 AM

- -- ---[XaOs]--- -- -[ Project fy ||| CyberTux ]

omega_001

122

October 16, 2001 05:24 AM

Did you remember to include the header file for that command?

#include

If it hasn''t compiled there is nothing wrong with the file its to do with your code.

Make sure xpos is a float.

If that doesn''t help tell us the error code.

________________________________________________

"Compare yourself to me then kill yourself"

baldurk

1,029

October 16, 2001 05:49 AM

it could be fscanf() giving you the problem. I noticed you are ignoring the 2nd and 3rd floats. The proper command should be:

fscanf (file, "%f %*f %*f", &xpos);

assuming the lines are just:

1.0 1.0 1.0

the * tells it to read a float but ignore it.

XaOs

122

Author

October 16, 2001 07:48 AM

Jupp!!! I got the #include right....

Okey....so presuming i got a file something like this :

1.0f, 1.0f, 1.0f, 1.0f
1.0f, 1.0f, 1.0f, 1.0f
1.0f, 1.0f, 1.0f, 1.0f

then i will do like this :

for (x=0; x<4; x++) {
for (y=0; y<3; y++) {
fscanf (file, "%f,%f,%f,%f", &x1, &x2, &x3, &x4);
}}

This is what you mean?
But what if i got like 30 floats in both x and y?
Then doing it like this would be a little wrong....

But..thanx anyway...i'll give it a try when i get home from school!!!!!

Take Care!

- -- ---[XaOs]--- -- -

[ project fy ]

Edited by - XaOs on October 16, 2001 8:48:47 AM

- -- ---[XaOs]--- -- -[ Project fy ||| CyberTux ]

XaOs

122

Author

October 16, 2001 07:51 AM

quote:Original post by XaOs
Jupp!!! I got the #include right....

Okey....so presuming i got a file something like this :

1.0f, 1.0f, 1.0f, 1.0f
1.0f, 1.0f, 1.0f, 1.0f
1.0f, 1.0f, 1.0f, 1.0f

then i will do like this :

for (x=0; x<4; x++) {
for (y=0; y<3; y++) {
fscanf (file, "%f,%f,%f,%f", &x1, &x2, &x3, &x4);
}}

This is what you mean?
But what if i got like 30 floats in both x and y?
Then doing it like this would be a little wrong....

But..thanx anyway...i''ll give it a try when i get home from school!!!!!

Take Care!

- -- ---[XaOs]--- -- -

[ project fy ]

Ohhhh...damn......i forgot something i my first post!!
he he....my xpos is really a xpos[10]!!!!!!

so reading would be something like this...

fscanf (file, "%f,", &xpos[x]);

might be a little more correct now......

Edited by - XaOs on October 16, 2001 8:48:47 AM

- -- ---[XaOs]--- -- -[ Project fy ||| CyberTux ]

XaOs

122

Author

October 16, 2001 07:52 AM

Holy cow....what did i do to that post?
Most have pressed the "quote" button instead of the "edit" button....

Cool post though.... *LOL*!!

Take Care!

- -- ---[XaOs]--- -- -

[ project fy ]

- -- ---[XaOs]--- -- -[ Project fy ||| CyberTux ]

pacrugby

122

October 16, 2001 09:22 AM

here is what I use:

  char ty[100];ifstream   InputFile2;InputFile2.open("example6.res", ios::in , filebuf::binary);InputFile2.getline(ty,100,''\n'');sscanf(ty,"%i %f %f %f %f %f %f %f %f %f %f %f %f",&a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&a11,&a12,&a13);

I read one line at a time.
I think its quicker???

TheMummy

122

October 16, 2001 11:13 AM

But what happens when the line is larger than 100 chars ?? How can you know that there are still characters waiting in this line ?
Why not using C++ ???
instead of these old style scanf methods?

istream file("myfile.txt",ios:open);
for(every float I am waiting for)
{
if(file.eof())
handle_this_error();

file >> nextfloat;
}

I always try to avoid these f(const char *, ...); methods , but sometimes they are realy powerful.

pacrugby

122

October 16, 2001 11:20 AM

I do it this way because it works.
I know it isnt pretty.
if you are reading data you should have an idea of the
ammount of info per line. All I need is 100char if you need more change it.
the '\n' reads till the end of line.
I think reading in a line and then using the string is
the fastest way to do things.
If it isnt Id love to know a faster way.
I deal with 9meg text files for my modeling.

Edited by - pacrugby on October 16, 2001 12:22:19 PM

File reading error.........grin

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