Which gtk method I have to use to get temporary pa

问题:

How can I get the temporary directory path in Ubuntu?

回答1:

On most Unix-like systems, you'd be looking for /tmp. If that's not quite the answer you were after, you should specify which bit of Ubuntu you're talking about.

Certain applications will allow you to specify where their temporary files are put (such as with the TMP, TEMP or TMPDIR environment variables) but a lot of stuff would break under UNIX if /tmp didn't exist, so it's safe just to use that. If you want to make it configurable, in your code, you'd use something like the function getTmpDir() in the following complete program:

#include <stdio.h>
#include <stdlib.h>

const char *getTmpDir (void) {
    char *tmpdir;

    if ((tmpdir = getenv ("TEMP")) != NULL)   return tmpdir;
    if ((tmpdir = getenv ("TMP")) != NULL)    return tmpdir;
    if ((tmpdir = getenv ("TMPDIR")) != NULL) return tmpdir;

    return "/tmp";
}

int main(void) {
    const char *xyzzy = getTmpDir();
    printf ("Temporary directory =  %s\n", xyzzy);
    return 0;
}

which outputs, in my CygWin environment (I have both TEMP and TMP set to this value):

Temporary directory =  /cygdrive/c/Users/Pax/AppData/Local/Temp

That's pretty much what the GLib g_get_tmp_dir() call does, though possibly in a different order.

Of course, if you wanted to use an application-specific environment variable, you could put that before the others thus:

const char *getTmpDir (void) {
    char *tmpdir;

    if ((tmpdir = getenv ("XYZZY_TMP")) != NULL)   return tmpdir;
    if ((tmpdir = getenv ("TEMP")) != NULL)        return tmpdir;
    if ((tmpdir = getenv ("TMP")) != NULL)         return tmpdir;
    if ((tmpdir = getenv ("TMPDIR")) != NULL)      return tmpdir;

    return "/tmp";
}

Or even take out some or all of the "standard" ones. But you should pretty much always fall back on /tmp if the user hasn't configured anything.

回答2:

I looked at how Python does this, and there doesn't seem to be any specific UNIX interface to do so.

They just try, in sequence:

1. The environment variables TMPDIR, TEMP, and TMP
2. /tmp
3. /var/tmp
4. /usr/tmp

Given that Python was written by people a lot smarter than I am, I'd be willing to bet this is probably the best you can do.

回答3:

Flocks,

Thanks for taking your time but what i am expecting is from the gnome link.

http://library.gnome.org/devel/glib/unstable/glib-Miscellaneous-Utility-Functions.html

using the API g_get_tmp_dir() we can have the location of temp directory

回答4:

There is an environment variable TMPDIR which can set the location of the temporary dir, most programs respect this, if it's not set it will default to /tmp (or /var/tmp)

回答5:

From the command line:

$ tempfile | xargs dirname
/tmp
$ TMPDIR="/mnt/tmp" tempfile | xargs dirname
/mnt/tmp