National Instruments NI-488.2 ユーザーズマニュアル

© National Instruments Corporation

to get a pointer to the exported function, you just need to call 

GetProcAddress

 passing the name of the function as a parameter. For 

more information about the parameters to use when you invoke the 
function, refer to the NI-488.2 online help. For instructions on accessing 
the online help, refer to the 

 section in 

The functions such as 

ibfind

, 

ibrdf

, and 

ibwrtf

 all require an argument 

that is a name. 

ibfind

 requires an interface or device name and 

ibrdf

 and 

ibwrtf

 require a file name. Because Windows supports both ASCII (8-bit) 

and Unicode (16-bit) characters, 

gpib-32.dll

 exports both ASCII and 

Unicode versions of these functions. The ASCII versions are named 

ibfindA

, 

ibrdfA

, and 

ibwrtfA

. The Unicode versions are named 

ibfindW

, 

ibrdfW

, and 

ibwrtfW

. You can use either the Unicode or ASCII 

versions of these functions with Windows.

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 

 section in 

.

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.

Make sure that the following lines are included at the beginning of your 
C application:

#ifdef __cplusplus

extern "C"{

#endif

#include <windows.h>

#include "ni488.h"

#ifdef __cplusplus

}

#endif