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7 messages in net.java.dev.jna.usersRe: [jna-users] How do I map size_t i...| From | Sent On | Attachments |
|---|---|---|
| John Caron | Oct 30, 2008 2:06 pm | |
| Kunal Shah | Oct 30, 2008 2:40 pm | |
| John Caron | Oct 30, 2008 2:57 pm | |
| Wayne Meissner | Oct 30, 2008 3:27 pm | |
| John Caron | Oct 30, 2008 3:35 pm | |
| Timothy Wall | Oct 31, 2008 4:51 am | |
| John Caron | Oct 31, 2008 12:04 pm |
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| Subject: | Re: [jna-users] How do I map size_t in C to Java? | Actions... |
|---|---|---|
| From: | Timothy Wall (twal...@dev.java.net) | |
| Date: | Oct 31, 2008 4:51:41 am | |
| List: | net.java.dev.jna.users | |
NativeLong should work in most cases, and if you run into a case where it doesn't, you can conditionalize for a give platform/library combination. Even if sizeof(size_t) were embedded into native code, there's still the possibility that it might be affected by compile- time flags, so there's no magic answer for portability.
On Oct 30, 2008, at 6:35 PM, John Caron wrote:
That's what I thought, but Ive been told that size_t and sizeof(long) might be different, and it depends on the compiler(?).
Wayne Meissner wrote:
2008/10/31 John Caron <car...@unidata.ucar.edu>:
I guess on some systems, size_t might be 64 bits, so how can I tell from Java in a portable way?
use NativeLong and NativeLongByReference
A NativeLong is a C 'long' - i.e. 32bits on 32bit systems, 64bit on 64bit unix.
Kunal Shah wrote:
I believe it will be IntByReference since the comment says it's a length.
Thanks!
On Thu, Oct 30, 2008 at 4:06 PM, John Caron <car...@unidata.ucar.edu <mailto:car...@unidata.ucar.edu>> wrote:
prototype:
int nc_inq_att(int ncid, int varid, const char *name, nc_type *xtypep, size_t *lenp);
example:
int status; /* error status */ int ncid; /* netCDF ID */ int rh_id; /* variable ID */ nc_type vr_type; /* attribute types */ size_t vr_len; /* attribute lengths */
status = nc_inq_att (ncid, rh_id, "valid_range", &vr_type, &vr_len);
thanks for any help, very cool package!