loading functions defined in header file with loadlibrary()

Background: Where I work, we use data acquisition units that record data in the manufacturer's proprietary format. However, we mainly use MATLAB for analyzing the data. In the past we would have to use the manufacturer's software to export the data into another format (usually CSV) before being able to import it into MATLAB. This is incredibly slow. Recently, I learned the manufacturer provides a closed-source library for dealing with the data files. I'd like to be able to use this library with MATLAB so the data can be directly imported into MATLAB for analysis.

Question: When I use loadlibrary() on the dll and header file I get errors about missing functions. These missing functions are defined in the header file and I'm guessing that MATLAB does not import functions defined in headers. Is this the case? And if it is, what is the best way to get around it?

[Walter Roberson]

Could you show an example error about the missing functions?

[Kaleb Barrett]

Warning: The function 'DMDReader_LoadLibrary' was not found in the library 
> In loadlibrary 
Warning: The function 'DMDReader_CloseLibrary' was not found in the library 
> In loadlibrary 
Warning: The data type 'FcnPtrPtr' used by function DMDReader_Dispose does not exist. 
> In loadlibrary 
Warning: The data type 'FcnPtrPtr' used by function DMDReader_OpenFile does not exist. 

... more complaints about FcnPtrPtr not existing but being used in every function in the library ...

Warning: The function 'loadFunction' was not found in the library 
> In loadlibrary

The three functions loadFunction, DMDReader_CloseLibrary, and DMDReader_LoadLibrary are defined in the header file associated with the library.

[James Tursa]

Are you sure that specific header file goes with the specific library file you are using? Looks like a mismatch.

[Kaleb Barrett]

Yes, I'm absolutely sure. The basic architecture of the library is that library functionality is only made available through function pointers that loadFunction and friends initialize. There is another header file with typedefs to cast the raw function pointers so you can call the loaded library functions. It's a common late binding technique, although probably unnecessary in this case.

Unless MATLAB has some hidden functionality to import functions defined in header files I'm thinking the easiest way this is going to be worked around is by writing a wrapper library that exposes the library functions as they are, without the late loading.