Reading from a file and using the data

[Ste_Mulv]

Hello all,

I am looking to keep a file with the running log the highest serial number issues, and therefore i know the next one to issue.

I have loaded the file by:

FILE *fp;
if ((fp = fopen("programdata", "r")) ==NULL){
printf("Error Data opening file\n");
 system("pause");
}

else { printf("Data file opened successfully\n");
system("pause");
}

it seems to load the file ok, but now i would like to read the data out of the file (it will be an int number)

i have tried:

int fgetc(FILE *fp); //load in highest saved serial number

int fclose(FILE *fp);
printf("Data Loaded\n");
system("pause");

this will give me avalible data (currently a value of "4") but how do i put it into a global variable so i can access it?

Thanks...

Steve

[matsp]

Perhaps what you want to use is fgets()?

--
Mats

[Ste_Mulv]

does this mean i can go:

int variablename;
variablename = fgets(FILE *fp);
printf("variablename");

will this print out the first value in my file?

How will i go about loading extra data from a file, for instance if i have a .txt file that looks like:

1 steve 23 engineer
2 bob 32 plumber

can i still use fgets()?

sorry to be asking such basic questions, but i havn't programmed C for years now, and it is true that if you don't use it you lose it!

Any good links on file handling, reading and writing?

Ste

[matsp]

No, not really. Since you indicated fgetc() I was thinking you wanted to read a text-string, not an integer value. If you want to read an integer value from a text-file, then fscanf() is probably the right thing to do.

For your second problem, either fscanf() or fgets() would work.

fgets takes three parameters:
1. a buffer to store a string in.
2. the size of the buffer.
3. the file to read from (which can be stdin if you want to read directly from console input).

--
Mats