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C++ Builder3 Linker Error

Posted on 2001-06-07
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Last Modified: 2012-08-13
To anyone willing to help,
I am trying to link advantech driver software to a data acquisition program I wrote using Borland C++builder3.
I have a PCL-812PG Multi-Lab card in my machine.

In my program I am able to include the header file "driver.h"
(#include"D:\Program Files\Advantech\ADSAPI\include\driver.h")

The error message reads as follows

[LinkerError] Unresolved external 'pcl818H(int,unsigned int*)' referenced from D:\PROGRAM FILES\BORLAND\CBUILDER3\PROJECTS\THESIS2.OBJ.

Thanks to jhance I have been able to eliminate suspicions of an exclude .LIB file by going in to 'Project Options' then 'Directories/Conditionals' then 'Library Paths' and specifying the path as follows:

D:\Program Files\Advantech\ADSAPI\Examples\BCB\LIB\ADSAPIBC.LIB

'pcl818H' is a function call to a parameter table the driver software uses. I declared at the end of the header file as follows:  extern pcl818H(int, unsigned int *);

This is fundamental stuff I know, but I have little experience in the field and this program is part
of my final year thesis to be presented on the 12th. So I'm pulling my hair out and would be very greatful
for any suggestions.
Thankyou,   (thanks to jhance for the help so far)
Richie.
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Question by:RLawless
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2 Comments
 
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Accepted Solution

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jkr earned 900 total points
ID: 6163531
You'll have to add a library that comes with the header file. The file itself just declares the functions that are used. the implementation resides in either a static lib file or a DLL that is bound to the project by a import lib. Both files end in .lib - see if you have it and add it to your project...
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Expert Comment

by:pbhj
ID: 6163684
jkr seems to be on the ball:  perhaps you've done this already?  You need to  use the file->'add to project'  and select the .lib file from the pop-up menu.  This adds the required file to the project makefile, just using #include isn't enough

Hope this helps.

pbhj
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