Thread: getting filename from a file pointer

I'm sort of confused on what exactly you want, but...

Code:

#include <stdio.h>

int file_stuff(char * File);

int main()
{
	file_stuff("hmmmmmm");
	return 0;
}

int file_stuff(char * File)
{
	FILE * Tmp;
	Tmp = fopen("foo.txt", "a");
	fprintf(Tmp, "Hmmmm\n");
	fprintf(Tmp, File);
	fclose(Tmp);
	return 0;
}

Does this help any?
That was off the top of my head.

Originally posted by Unregistered
I can just print out the file pointer as a string.

errr.... no. You can't do this:

Code:

#include <stdio.h>

int main(void)
{
	FILE *fp;
	
	if ((fopen("junk1.c", "r")) == NULL)
	{
		perror("junk1.c");
		return (1);
	}
	/* this will NOT work */
	printf ("Filename: %s\n", fp);
	return (0);
}

You mind expanding on your comments please?

Was it something like this maybe?

Code:

#include <stdio.h>

int main()
{
	char * FileName = "foo.txt";
	FILE * Point;
	Point = fopen(FileName, "a");
	fprintf(Point, "blah");
	printf("%s", FileName);
	fclose(Point);
	return 0;
}

>Was it something like this maybe?
I suppose so, but that isn't what the original poster asked for:

what function could i call on the pointer to give me that filename

I don't know of one that can do what is being asked.....

> I don't know of one that can do what is being asked.....
Maybe you have to say the magic word.
PLEASE.

I can see your point.
Printf is a function.
System is a function.
You can create your own functions. - this doesn't apply though
That's an awfully general question.

Duely noted.

Shadow, you've lost me ! Are we talking about the same thing?!!

Read the original post.... it is a request for a function to obtain the name of the file opened by any given file pointer.

So, if we did this in main():
>FILE *fp = fopen ("test.txt", "r");

Then passed fp to another function like this:
>myfunc(fp);

How would myfunc know the name of the file was test.txt? This is what was asked for:
> if in a function i don't have the filename that the file pointer is pointing to, what function could i call on the pointer to give me that filename?

Now, a function doesn't exist (I don't think) that will do that job. No amount of "please" will get you one! And there's nothing general about that question, it's pretty darn specific

You're right hammer. I was off base on that one.
Sorry - there's just been too many confusing posts today.

do you mean using the argv as a string in the first parameter of fopen()?