C++ - external header file in a class

[hnasr20012001]

A DAC (Data acquisition Card)came with its high level functions. One of them is DigitalIO() and its header file if ljacklm.h

if I use #include "ljacklm.h" and in the main function use DigitalIO(), I am able to compile the code with no error.
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I want to use DigitalIO() inside the processloop() which is a function member of a class called "process".

In process.h file I add #include "ljacklm.h" and in the processloop() function I called DigitalIO(). I am getting "undefined reference to DigitalIO".

How to properly reference to DigitalIO?

Thank you

[ne555]

http://www.cplusplus.com/forum/general/113904/#msg622055