National Instruments PC-OPDIO-16 Manuale Utente

The Fundamentals of Building Applications with NI-DAQChapter 4

PC-OPDIO-16 User Manual

4-4

© National Instruments Corporation

Running Your Application Inside the Visual Basic Environment

First, you must create an NI-DAQ Quick library.

MAKEQLB.BAT

in the

QLBUTIL

subdirectory is useful for creating Quick libraries for Visual

Basic.

The steps for making a Quick library are as follows:

1. Edit

NIDAQ.BAS

. Remove the keyword

REM

from functions you want to include in the

Quick library.

2. Run this batch file by using the following command:

MAKEQLB VB

3. If all files needed to build the Quick library are found, and the linking was successful, the

batch file creates a Quick library in the

NI-DAQ LIB

subdirectory with a

.QLB

extension.

Next, load the Quick library when you enter the environment by using the following
command:

vbdos /l NIDAQVB

Note: Visual Basic returns an out-of-memory error either when you try to load the Quick

library or when you try to run your application. You may try to free up memory by
removing as many TSRs or device drivers as possible before entering the Visual Basic
environment.

After you are inside the environment, you can load the source file of your application and run it.

Compiling and Running Your Visual Basic Application from the DOS Prompt

The steps to run your application outside Visual Basic environment are as follows:

1. Compile your source code with the Visual Basic compiler. For example:

bc /O diginout.bas;

Note: NOT ENOUGH MEMORY—If the Visual Basic compiler does not have enough

memory to compile your application, you should first try to make available as much
conventional memory as possible. See your DOS manual for information on how
to do so. If you still cannot compile your application, you can edit the files

NIDAQ.INC

(or

NIDAQR.INC

) and

NIDAQCNS.INC

to reduce their size.

2. Link the object file (using Microsoft Overlay Linker Version 3.61 or later) produced in step 1

with

NIDAQMSC.LIB

SUP71.LIB

, and the Visual Basic library. For example:

link /NOE /NOD /SEG:250 diginout,,, VBDCL10E NIDAQMSC SUP71;

You must include the

SUP71

library in your link command because the DOS NI-DAQ

library

NIDAQMSC.LIB

is compiled using the Microsoft C compiler. Microsoft C support

functions are contained in the

SUP71

library, which you can find in the

NI-DAQ LIB

subdirectory. You should include the NI-DAQ

LIB

directory and the Basic

LIB

directory in