Справочник Пользователя для National Instruments NI-DNET

For C applications (files with 

.c

 extension), include the header file by 

adding a 

#include

 to the beginning of your code, like this:

#include "nidnet.h"

For C++ applications (files with 

.cpp

 extension), define 

_cplusplus

 

before including the header, such as:

#define _cplusplus

#include "nidnet.h"

The 

_cplusplus

 define enables the transition from C++ to the C language 

NI-DNET functions.

The reference for each NI-DNET function is provided in the NI-DNET 
Programmer Reference Manual, which you can open from Start»All 
Programs»National Instruments»NI-DNET.

You can find examples for Visual C++ in the 

examples

 subfolder of the 

Borland C 

folder. Each example is in a separate folder. A 

.c

 file with the 

same name as the example contains a description the example in comments 
at the top of the code.

You can directly access NI-DNET from any programming environment 
that allows you to request addresses of functions that a dynamic link library 
(DLL) exports. The functions used to access a DLL in this manner are 
provided by the Microsoft Win32 functions of Windows. Using these 
Microsoft Win32 functions to access a DLL is often referred to as direct 
entry. To use direct entry with NI-DNET, complete the following steps:

1.

Load the NI-DNET DLL, 

nican.dll

. 

The following C language code fragment illustrates how to call the 
Win32 

LoadLibrary

 function and check for an error.

#include <windows.h>

#include "nidnet.h"

HINSTANCE NidnetLib = NULL;

NidnetLib=LoadLibrary("nican.dll");

if (NidnetLib == NULL) {

   return FALSE; /*Error*/

}