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Chapter 3 Developing Your NI-488.2 Application
NI-488.2 User Manual for Windows 3-14 www.natinst.com
support 16-bit wide characters, use only the 8-bit ASCII versions, named
ibbnaA
,
ibfindA
,
ibrdfA
, and
ibwrtfA
. The Unicode versions are
named
ibbnaW
,
ibfindW
,
ibrdfW
, and
ibwrtfW
. You can use either the
Unicode or ASCII versions of these functions with Windows 2000/NT, but
only the ASCII versions with Windows 98/95.
In addition to pointers to the status variables and a handle to the loaded
gpib-32.dll
, you must define the direct entry prototypes for the
functions you use in your application. For the prototypes for each function
exported by
gpib-32.dll
, refer to the NI-488.2 online help. For
instructions on accessing the online help, refer to the Using the NI-488.2
Documentation section in About This Manual.
The direct entry sample programs illustrate how to use direct entry to
access
gpib-32.dll
. For more information about direct entry, refer to the
online help for your development environment.
Directly Accessing the gpib-32.dll Exports
Make sure that the following lines are included at the beginning of your
application:
#ifdef __cplusplus
extern "C"{
#endif
#include <windows.h>
#include "decl-32.h"
#ifdef __cplusplus
}
#endif
In your Win32 application, you need to load
gpib-32.dll
before
accessing the
gpib-32.dll
exports. The following code fragment shows
you how to call the
LoadLibrary
function to load
gpib-32.dll
and
check for an error:
HINSTANCE Gpib32Lib = NULL;
Gpib32Lib=LoadLibrary("GPIB-32.DLL");
if (Gpib32Lib == NULL) {
return FALSE;
}