opendir doesn't work..

[Markus Pitha]

Hello,
i'm using Gentoo Linux and like to open directories which i got from a
text file i read of. I tried to open a directory as i wrote the
directory name directly into "opendir()" and it worked. When i use this
pointer on the array "input", which contains the actual directory, the
program cannot read the directory.
I already tested if "input" contains the directories at all, but it does.

if ((fp = fopen(fpath, "r")) == NULL) {
fprintf(stderr, "Couldn't open config file");
exit(1);
}
while (!feof (fp) ) {
fgets(input, pathlength, fp);
if ((dir=opendir(i nput)) != NULL) { /* opendir cannot open the directory, stored in "input" */
while ((dirzeiger=rea ddir(dir)) != NULL)
printf("%s\n", (*dirzeiger).d_ name);
}
closedir(dir);
}
fclose(fp);

Any ideas?

[Markus Pitha]

Now i hope the code looks fine...

if ((fp = fopen(fpath, "r")) == NULL) {
fprintf(stderr, "Couldn't open config file");
exit(1);
}
while (!feof (fp) ) {
fgets(input, pathlength, fp);
if ((dir=opendir(i nput)) != NULL) {
while ((dirzeiger=rea ddir(dir)) != NULL)
printf("%s\n", (*dirzeiger).d_ name);
}
closedir(dir);
}
fclose(fp);

[Al Bowers]

Markus Pitha wrote:

Now i hope the code looks fine...

if ((fp = fopen(fpath, "r")) == NULL) {
fprintf(stderr, "Couldn't open config file");
exit(1);
}
while (!feof (fp) ) {
There is a faq question on this. Read:
http://www.eskimo.com/~scs/C-faq/q12.2.html

Instead of using the function feof simply make
the while loop:
while(NULL != fgets(input, pathlength, fp))
{
if(dir=opendir( input)) ...etc...
....

fgets(input, pathlength, fp);
if ((dir=opendir(i nput)) != NULL) {
while ((dirzeiger=rea ddir(dir)) != NULL)
printf("%s\n", (*dirzeiger).d_ name);
}
closedir(dir);
}
fclose(fp);

--
Al Bowers
Tampa, Fl USA
mailto: xa******@myrapi dsys.com (remove the x to send email)
http://www.geocities.com/abowers822/

[Al Bowers]

Al Bowers wrote:

Markus Pitha wrote:

Now i hope the code looks fine...

if ((fp = fopen(fpath, "r")) == NULL) {
fprintf(stderr, "Couldn't open config file");
exit(1);
}
while (!feof (fp) ) {

There is a faq question on this. Read:
http://www.eskimo.com/~scs/C-faq/q12.2.html

Instead of using the function feof simply make
the while loop:
while(NULL != fgets(input, pathlength, fp))
{
if(dir=opendir( input)) ...etc...
....

I forgot to mention that function fgets will read the
newline char in most situations. For example, if you
have a line in the file with a directory name of
"windows", function fgets will reading into the
input buffer "windows\n" . Depending on the definiton
of function, this might fail. I suggest you remove
the newline char before calling function opendir.

#include <stdio.h>
#include <string.h>

char *s;
while(NULL != fgets(input,pat hlength,fp))
{
if((s = strchr(input,'\ n')) != NULL) *s = '\0';
if(dir = opendir( .....etc....... .
.........

fgets(input, pathlength, fp);
if ((dir=opendir(i nput)) != NULL) {
while ((dirzeiger=rea ddir(dir)) != NULL)
printf("%s\n", (*dirzeiger).d_ name);
}
closedir(dir);
}
fclose(fp);

--
Al Bowers
Tampa, Fl USA
mailto: xa******@myrapi dsys.com (remove the x to send email)
http://www.geocities.com/abowers822/

[Flash Gordon]

On Sun, 12 Sep 2004 12:47:55 GMT
Markus Pitha <ma****@acid4u. com> wrote:

Now i hope the code looks fine...

if ((fp = fopen(fpath, "r")) == NULL) {
fprintf(stderr, "Couldn't open config file");
exit(1);
}
while (!feof (fp) ) {
fgets(input, pathlength, fp);
if ((dir=opendir(i nput)) != NULL) {
while ((dirzeiger=rea ddir(dir)) != NULL)
printf("%s\n", (*dirzeiger).d_ name);
}
closedir(dir);
}
fclose(fp);

The C language as defined by the ISO/ANSI standards does not support
reading directories. You need to ask in either a Linux programming group
(since your previous post said you use Gentoo) or a unix programming
group such as comp.unix.progr ammer
--
Flash Gordon
Sometimes I think shooting would be far too good for some people.
Although my email address says spam, it is real and I read it.

[Markus Pitha]

Hello Al,
i adopted your proposal and I even solved another problem too, thanks.

Markus.