Tutorials on text files
Author
Could anyone gimme a link to tutorials on loading from and writing to plain text files ?
Or if there is a better way to save info so that i wont loose it if i quit my prog. Actually, i only have to save numbers.. but saving characters might be useful too if that doesnt complicate things too much.
JT
Cause I think you''re pretty new, I''d start with text files...
first start opening a file:
FILE * file = fopen("save.txt", "wt");
"wt" stands for write textmode....
now you''ve got a handle to an open file...
I guess you know the printf(); function and it''s syntax...
the same with a f in front of it and a little diffrent syntax:
fprintf(file, "%f %d %s\n", 1.875, 16, raw);
and finally close the file:
fclose (file);
this would result in following .txt file
1.87500 16 raw
(how do I show a newline charakter? :p)
to read the stuff:
FILE * file = fopen("save.txt", "rt");
notice the "rt" instead of the "wt" -> read textmode
float afloat;
int anint;
char astring[50];
fscanf(file, "%f %d %s", &afloat, &anint, astring);
watchout that strings in the file may not have spaces if you''re trying to read it with one %s..
ok, hope that helped,
cya,
Phil
Visit Rarebyte!
and no!, there are NO kangaroos in Austria (I got this questions a few times over in the states
first start opening a file:
FILE * file = fopen("save.txt", "wt");
"wt" stands for write textmode....
now you''ve got a handle to an open file...
I guess you know the printf(); function and it''s syntax...
the same with a f in front of it and a little diffrent syntax:
fprintf(file, "%f %d %s\n", 1.875, 16, raw);
and finally close the file:
fclose (file);
this would result in following .txt file
1.87500 16 raw
(how do I show a newline charakter? :p)
to read the stuff:
FILE * file = fopen("save.txt", "rt");
notice the "rt" instead of the "wt" -> read textmode
float afloat;
int anint;
char astring[50];
fscanf(file, "%f %d %s", &afloat, &anint, astring);
watchout that strings in the file may not have spaces if you''re trying to read it with one %s..
ok, hope that helped,
cya,
Phil
Visit Rarebyte!
and no!, there are NO kangaroos in Austria (I got this questions a few times over in the states
Author
yup, that helped
thanks alot.
btw, check out the project im workin on: http://home.online.no/~7396/delta/
thanks alot.
btw, check out the project im workin on: http://home.online.no/~7396/delta/
If you''re saving numbers, you''d be far better off with binary files. You can save numbers and any other variables/structs/whatever like this:
That should do it. Saving in binary mode also means it will be harder for your users to manually modify their save files to cheat.
int SaveFile(char *filename){ FILE *file; //Open file (w stands for write). Return 0 on error if((file = fopen(filename, "w")) == NULL) return 0; //Write the integers to the file fwrite(&SOME_DATA, sizeof(int), 1, file); fwrite(&some_more_data, sizeof(int), 1, file); //Close file fclose(file);}int OpenFile(char *filename){ FILE *file; //Open file (r stands for read). Return 0 on error if((file = fopen(filename, "r")) == NULL) return 0; //Read integers from file fread(&some_data, sizeof(int), 1, file); fread(&some_more_data, sizeof(int), 1, file); //Close file fclose(file);} That should do it. Saving in binary mode also means it will be harder for your users to manually modify their save files to cheat.
Jup, he''s right, I just think text files are easier to start with :o)... you can also use nice tricks... like encoding your numbers in some fashion.. that makes things harder too :o)))
cya,
Phil
Visit Rarebyte!
and no!, there are NO kangaroos in Austria (I got this questions a few times over in the states
cya,
Phil
Visit Rarebyte!
and no!, there are NO kangaroos in Austria (I got this questions a few times over in the states
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