Problems with external dll

I everybody,
I'm trying to control an instrument (Bayspec wavecapture, FBG interrogator) by means of Labwindows 9.0. I have the SDK provided from Bayspec, which consists of a library .lib file, a .dll file and an header .h file. I added the .lib and .h files to the project, put the .dll file in the same project directory, and write a minimal code to try to open and close the device. After compilation I received a lot of errors, some of that I solved "empirically": problems with the types WORD, BYTE, LPCSTR, which I solved by adding into the header file:
#define WORD int
#define BYTE char
#define LPCSTR const char (but probably should be const char*)
function missing prototypes error, which I solved by specifing into the function definition the void type, i.e.:
DLL_PORT_TYPE    BOOL DLL_PORT_FUNCTION_TYPE DLL_Open_Device(void);
instead of
DLL_PORT_TYPE    BOOL DLL_PORT_FUNCTION_TYPE DLL_Open_Device();
After that I was able to compile without any error or warning, but when I build everything I have the following project link error:
Undefined symbol '_DLL_Open_Device@0' referenced in "bayspec_2.c".
I suppose the dll was realized with/for visual c++ 6.
The first lines of the .h file are the following:
#ifndef _Sense2020DLL_
#define _Sense2020DLL_
//difine the export type
#define DLL_PORT_TYPE __declspec(dllexport)
#define DLL_PORT_FUNCTION_TYPE __stdcall    //this can be used in visual basic program
I feel that in that lines could be located the problem, but I'm a newbie programmer.
Thanks a lot if you can help me and sorry if the solution was into the official documentation because I was unable to found it.
Cosimo

Hi Badal,
I would suggest to you to open a new thread on the NI Forum. This would allow you to submit your topic to a very large community instead of continuing an old post with very low visibility. By the way a took a look on the instrument driver network and I din't get any feedback about the istrument you are looking for. So it might be useful for you to ask to the Bayspec if they provide for some LabWindows/CVI(?) instrument driver.
Good luck for your search and have a great day.
Matteo C. - Test Engineer

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