| Re: DLM 32/64 bits [message #60342] |
Mon, 19 May 2008 09:16  |
Abraham campbell
Messages: 10
Registered: January 2008
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Junior Member |
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On May 15, 1:39 am, lecacheux.al...@wanadoo.fr wrote:
> This is maybe a question more related to Windows than to IDL: is there
> a way to use, within IDL, a 32 bits DLM (i.e. 32 bits dll) while
> running a 64 bits system (XP64 or Vista) ? Of course, DLL sources are
> not available for being recompiled in 64 bits.
> Thanks for any insight.
> alx
I'm guessing that you can't mix and match 32- and 64-bit object code
in the same process. However, there is an undocumented feature in IDL
7.0 for the idl_idlbridge object that might help.
Normally, when you create an instance of the idl_idlbridge object, it
creates an Out-of-Process Server (which loads IDL) in the same bitness
as the parent process. For example, a 64-bit parent process creates a
64-bit OPS child process. You can then interact with that OPS/IDL
using the idl_idlbrddge interfaces 'execute', 'getvar', 'setvar',
etc. In IDL 7.0, there is an undocumented keyword 'ops' that allows
you to control the bitness of the OPS/IDL child process that gets
created. You can specify either '32' or '64' as the 'ops' keyword
value, e.g. "ops=32" or "ops=64". Then, calling 'setvar' and 'getvar'
automatically marshals the data correctly between the different bit
processes. There is some error checking for such things as trying to
marshal a very, very large array from a 64-bit process back to a 32-
bit process, where the array is too large to fit into a 32-bit address
space.
For example,
To create a 32-bit OPS process:
o32 = obj_new('idl_idlbridge',ops=32)
To create a 64-bit OPS process:
o64 = obj_new('idl_idlbridge',ops=64)
You can even mix creating many 32- and 64-bit child processes from the
same parent process.
So, you could use this to create an idl_idlbridge process in 32-bit
mode from your 64-bit parent process. Then, load/use your 32-bit DLM
in that 32-bit OPS/child process. You could then get and set data
from the 32-bit child process.
Similarly, if you are in a 32-bit parent process, you can create a 64-
bit child process, in order to use 64-bit DLMs that can handle very
large data.
This works on all supported platforms, though there are some known
issues with trying to use this undocumented keyword in 'run-time
distributions' where IDL is not officially installed, but all the
files are just copied. But, if you are running with an installed
version of IDL, it should work. However, since it's 'undocumented' it
works 'as-is' and there is no official tech support for it. So, use
at your own discretion.
Abraham
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| Re: DLM 32/64 bits [message #60497 is a reply to message #60342] |
Tue, 20 May 2008 13:51  |
lecacheux.alain
Messages: 325
Registered: January 2008
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Senior Member |
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On 19 mai, 18:16, abra...@ittvis.com wrote:
> On May 15, 1:39 am, lecacheux.al...@wanadoo.fr wrote:
>
> I'm guessing that you can't mix and match 32- and 64-bit object code
> in the same process. However, there is an undocumented feature in IDL
> 7.0 for the idl_idlbridge object that might help.
>
> Abraham
Thanks for the tip. Since the idl_idlbridge object was already defined
in 6.4, would it be possible to use it with this version instead of
7.0 ?
alx.
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