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8 messages in net.java.dev.jna.usersRe: [jna-users] Passing a Null Array ...| From | Sent On | Attachments |
|---|---|---|
| Timothy Wall | Jul 17, 2008 10:18 am | |
| Wayne Meissner | Jul 17, 2008 3:57 pm | |
| Nikolas Lotz | Jul 18, 2008 1:49 am | |
| RWAD...@UP.COM | Jul 18, 2008 5:07 am | |
| Timothy Wall | Jul 18, 2008 5:41 am | |
| Timothy Wall | Jul 18, 2008 7:20 am | |
| Timothy Wall | Jul 18, 2008 7:53 am | |
| RWAD...@UP.COM | Jul 18, 2008 8:21 am |
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| Subject: | Re: [jna-users] Passing a Null Array Pointer | Actions... |
|---|---|---|
| From: | RWAD...@UP.COM (RWAD...@UP.COM) | |
| Date: | Jul 18, 2008 8:21:04 am | |
| List: | net.java.dev.jna.users | |
After some more digging, I think this may have been red herring. It looks like the problem is an array of structures inside a structure, which I'll start a separate thread for.
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Timothy Wall <twal...@dev.java.net> 07/18/2008 09:54 AM Please respond to use...@jna.dev.java.net
To use...@jna.dev.java.net cc
Subject Re: [jna-users] Passing a Null Array Pointer
I just checked this against the current test suite, and "null" works as a substitute for Structure[]. Are you certain it's not your native code that is choking when it gets a null pointer?
On Jul 18, 2008, at 8:08 AM, RWAD...@UP.COM wrote:
I'm having difficulty passing a null pointer to an array as an argument to a C function. The Java declaration is:
voidefm111_det_enty_rop_at_loca(FacilityTypeStructure fac_type, intin_rl_nbr, PropoStructure in_propo[], ShortByReference sop_count, ObjectPointAndOrientationStructure sop[]);
It works fine when I use an actual array as the third argument (PropoStructure in_propo[]), but I need to be able to test the use case where the array pointer is null. More specifically, where the C code says
if (in_propo == (Propo_Struct *)NULL) {...}
I tried substituting a Java null as the third argument, but that causes a JVM crash. I didn't see anything in the forum that covers this exact scenario, but I'm guessing one of the JNA memory or pointer classes must be what I want. I just can't figure out how to do it.
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and delete the message and any attachments.