Mac os x, Mac os x -4 – National Instruments NI-488.2 User Manual
Page 41
Chapter 4
Developing Your NI-488.2 Application
4-4
ni.com
Modifying existing applications to use the NI4882 API should require
minimal changes. In most cases, using the new include file (
ni4882.h
instead of
windows.h
and
ni488.h
) and linking to the new object file
(
ni4882.obj
instead of
gpib-32.obj
) is sufficient to compile your
application. There may still be warnings due to changes to the status
variable type’s signed property.
Complications may arise in several uncommon use cases. The following
issues have been encountered.
•
Storing function pointers for the
ibnotify
callback. This causes a
type mismatch on the assignment. To solve this, fix the function
prototype of the callback to use
unsigned long
for the status
parameters.
•
Using function pointers to
ibfind
. This causes a preprocessor error
because the
ibfind
macro requires a one-parameter argument. To
solve this, point to
ibfindA
or
ibfindW
, depending on the unicode
convention in your application.
•
Configuration functions show up in NI Spy as
ibconfig
calls. This is
because macros redirect those calls to use
ibconfig
. Avoid confusion
by using
ibconfig
directly.
In most cases, applications written in the NI4882 API will continue to
work on older versions of the NI-488.2 for Windows software, back to
version 1.7. Certain new
ibask
and
ibconfig
options break this
backwards compatibility, and those options are easily avoidable by using
alternative options. Existing applications using the GPIB32 API continue
to execute unchanged. The GPIB32 API will continue to exist, but are
available only for 32-bit applications. Applications written in the NI4882
API compile on both 32-bit and 64-bit environments. To port an application
to a 64-bit environment requires that the application migrate to the NI4882
API and be recompiled.
The following NI4882 API constructs break API compatibility with older
versions of NI-488.2 for Windows.
•
ibask
(
IbaEOS
)
•
ibconfig
(
IbcEOS
)
Mac OS X
NI-488.2 has
NI488.framework
Carbon framework for Mac OS X,
which you can use from your C/C++ applications.