Hello Ian,
Yes, thank you, this is very interesting; I noticed your code in response to a
previous post which I also replied to; although in retrospect, _my_ reply to
that post is possibly erroneous: there are obviously caveats to the path when
running a windows app under Wine that I was not aware of at that time. On
MacOS, I believe the issue is complicated because one never knows if your
program will launched by the Finder, Xcode, gdb, or the console. Mr. Eberly
also has a neat solution for this issue when running under MacOS in his
Wm3.System.cpp from the WildMagic 3 distribution.
Nicholas
>
>
> For what it is worth (and this doesn't really answer your question,
> since it does not integrate well with Fl_Preferences and so forth) here
> is the code I use to ascertain the app's "home" directory in a
> cross-platform way.
>
> Might be some use to you, I guess.
>
>
>
>
> /*
> * Mechanism to handle determining *where* the exe actually lives
> */
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
>
> #ifdef WIN32
> #include <windows.h> /* GetModuleFileName */
> #endif /* WIN32 */
>
> #ifdef __APPLE__ /* assume this is OSX */
> #include <sys/param.h>
> #include <mach-o/dyld.h> /* _NSGetExecutablePath : must add -framework
> CoreFoundation to link line */
> #include <string.h>
> # ifndef PATH_MAX
> # define PATH_MAX MAXPATHLEN
> # endif
> #endif /* APPLE */
>
> #ifndef PATH_MAX
> # define PATH_MAX 2048
> #endif
>
> #include "get_app_path.h"
>
> /***********************************************************************
> *********************/
> int get_app_path (char *pname, size_t pathsize)
> {
> long result;
>
> #ifdef LINUX
> /* Oddly, the readlink(2) man page says no NULL is appended. */
> /* So you have to do it yourself, based on the return value: */
> pathsize --; /* Preserve a space to add the trailing NULL */
> result = readlink("/proc/self/exe", pname, pathsize);
> if (result > 0)
> {
> pname[result] = 0; /* add the #...@!%ing NULL */
>
> if ((access(pname, 0) == 0))
> return 0; /* file exists, return OK */
> /*else name doesn't seem to exist, return FAIL (falls
> through) */
> }
> #endif /* LINUX */
>
> #ifdef WIN32
> result = GetModuleFileName(NULL, pname, pathsize);
> if (result > 0)
> {
> /* fix up the dir slashes... */
> int len = strlen(pname);
> int idx;
> for (idx = 0; idx < len; idx++)
> {
> if (pname[idx] == '\\') pname[idx] = '/';
> }
> if ((access(pname, 0) == 0))
> return 0; /* file exists, return OK */
> /*else name doesn't seem to exist, return FAIL (falls
> through) */
> }
> #endif /* WIN32 */
>
> #ifdef SOLARIS
> char *p = getexecname();
> if (p)
> {
> /* According to the Sun manpages, getexecname will
> "normally" return an */
> /* absolute path - BUT might not... AND that IF it is not,
> pre-pending */
> /* getcwd() will "usually" be the correct thing... Urgh!
> */
>
> /* check pathname is absolute (begins with a / ???) */
> if (p[0] == '/') /* assume this means we have an
> absolute path */
> {
> strncpy(pname, p, pathsize);
> if ((access(pname, 0) == 0))
> return 0; /* file exists, return OK */
> }
> else /* if not, prepend getcwd() then check if file
> exists */
> {
> getcwd(pname, pathsize);
> result = strlen(pname);
> strncat(pname, "/", (pathsize - result));
> result ++;
> strncat(pname, p, (pathsize - result));
>
> if ((access(pname, 0) == 0))
> return 0; /* file exists, return OK */
> /*else name doesn't seem to exist, return FAIL
> (falls through) */
> }
> }
> #endif /* SOLARIS */
>
> #ifdef __APPLE__ /* assume this is OSX */
> /*
> from http://www.hmug.org/man/3/NSModule.html
>
> extern int _NSGetExecutablePath(char *buf, unsigned long
> *bufsize);
>
> _NSGetExecutablePath copies the path of the executable
> into the buffer and returns 0 if the path was successfully
> copied in the provided buffer. If the buffer is not large
> enough, -1 is returned and the expected buffer size is
> copied in *bufsize. Note that _NSGetExecutablePath will
> return "a path" to the executable not a "real path" to the
> executable. That is the path may be a symbolic link and
> not the real file. And with deep directories the total
> bufsize needed could be more than MAXPATHLEN.
> */
> int status = -1;
> char *given_path = malloc(MAXPATHLEN * 2);
> if (!given_path) return status;
>
> pathsize = MAXPATHLEN * 2;
> result = _NSGetExecutablePath(given_path, &pathsize);
> if (result == 0)
> { /* OK, we got something - now try and resolve the real path...
> */
> if (realpath(given_path, pname) != NULL)
> {
> if ((access(pname, 0) == 0))
> status = 0; /* file exists, return OK */
> }
> }
> free (given_path);
> return status;
> #endif /* APPLE */
>
> return -1; /* Path Lookup Failed */
> } /* where_do_I_live */
>
> /***********************************************************************
> *********************/
> /* End of File */
>
>
>
>
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