loading an existing dll

Hi all-

I want write a C++ s-function that accesses/loads an existing dll. I have an existing example calling the dll using fortran:

REAL(4)       :: avrSWAP(*)    
INTEGER(4)    :: aviFAIL                 
INTEGER(1)    :: accINFILE(*)         
INTEGER(1)    :: avcMSG(*) 
INTEGER(1)    :: avcOUTNAME(*)   

INTEGER(HANDLE) :: FileAddr                            
INTEGER(LPVOID) :: ProcAddr                              

POINTER ( DLL_ProcAddr, DLL_Procedure )
INTERFACE
     SUBROUTINE DLL_Procedure(avrSWAP,aviFAIL,accINFILE,avcOUTNAME,avcMSG)
         REAL(4)                :: avrSWAP   (*)
         INTEGER(4)             :: aviFAIL
         INTEGER(1)             :: accINFILE (*)
         INTEGER(1)             :: avcMSG    (*)
         INTEGER(1)             :: avcOUTNAME(*)
      END SUBROUTINE DLL_Procedure
END INTERFACE

FileAddr = LoadLibrary( "DISCON.DLL" )
ProcAddr = GetProcAddress( DLL_Trgt%FileAddr, "DISCON" )

DLL_ProcAddr = ProcAddr
CALL DLL_Procedure ( avrSWAP, aviFAIL, accINFILE, avcOUTNAME, avcMSG )

Is there an example of doing something similar from a C++ s-function? The interface is clear from the fortran code, but I do not have the header file or the code for this dll. I am quite confident that I can write/hack my own C++ header for it if that is necessary. If anyone wants to take a crack at actually writing the necessary C++ code to load and call the dll, that would be absolutely terrific. Otherwise, just a simple example of a C++ s-function calling any dll would be fantastic as well.

Thanks for any and all help,

-Jason

[Kaustubha Govind]

JH: S-functions support standard C usage (I think it's the C99 standard, but it probably depends on what MEX compiler you're using), so I would recommend that you attempt to first write standalone C/C++ code that uses the DLL outside of MATLAB, and test it out. Once you have that working, you can use the same type of call in an S-function.