File *f[i] array?

TidyFileCat for multiple FileCats.

Code:

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int main(){
        FILE *f[20];
        char FileName[20];  /* Plenty large for your file naming */
        int i;
        int NumberOfFiles = 20;

        for (i=0; i<NumberOfFiles; i++){
                        sprintf(FileName,"Channel%d.txt",i);
                        f[i] = fopen(FileName,"r+");
        }


}

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Close the files the same way.

Code:

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int main(){
        FILE *f[20];
        char FileName[20];  /* Plenty large for your file naming */
        int i;
        int NumberOfFiles = 20;

        for (i=0; i<NumberOfFiles; i++){
                        sprintf(FileName,"Channel%d.txt",i);
                        f[i] = fopen(FileName,"r+");
        }

/* close loop */

        for (i=0; i<NumberOfFiles; i++){
                        sprintf(FileName,"Channel%d.txt",i);
                        f[i] = fclose(FileName);
        }


}

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But what if for some reason some of the files were closed and some were not closed as each file was delt with? Meow. How to check the status of each individual file?

What if the prog exits with out closing that many files or misses some. How to close the file after the prog exited or restarted? .... just open and close it again?

Just saying a open file after prog exited can be a problem.

Could you provide some reasons and examples for having multiple files open?

Quote:

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Originally Posted by kryptkat

But what if for some reason some of the files were closed and some were not closed as each file was delt with?

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Then.... the programmer messed up? Dunno, you tell me.

Quote:

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Originally Posted by kryptkat

How to check the status of each individual file?

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Same way you do with every other file you open. Something like:

Code:

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if(file[i] == NULL)

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Quote:

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Originally Posted by kryptkat

What if the prog exits with out closing that many files or misses some.

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Depending on how you opened it, the file will be closed automatically. The C standard library cleans up files opened with it. It performs fflush() on all output streams, and closes all file streams.

Quote:

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Originally Posted by kryptkat

How to close the file after the prog exited or restarted? .... just open and close it again?

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Depending on how you locked the file open, you might need to reboot or something.

Quote:

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Originally Posted by kryptkat

Could you provide some reasons and examples for having multiple files open?

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How about if you wanted to create a copy of a file? You could read in from one file while writing to another. Now you could very well just read the one file into memory and then write it to the new file, but that doesn't work if the original file is 4+GB or so and you don't have the RAM to do it. You would need to keep both files open at the same time and write it as you go along.

Code:

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    for (i=0; i<NumberOfFiles; i++){
        fclose(f[i]);
    }

---

http://www.cplusplus.com/reference/c...io/fclose.html

Quote:

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But what if for some reason some of the files were closed and some were not closed as each file was delt with?

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check the return variable of fclose.