Using external DLL's with Visual Fortran

[Intel_C_Intel]

Hi,
I'm trying to write some code to download information from a piece of hardware. The manufacturers provided a .dll file with its associated .def and .lib files containing commands to download the data from the serial port. I can compile the code that I have written, but when I try to build the executable file I get the following error message:

Linking...
Creating library Debug/cloud.lib and object Debug/cloud.exp
cloud.exp : warning LNK4070: /OUT:VANTAGEPRO.exe directive in .EXP differs from output filename "Debug/cloud.exe"; ignoring directive
Debug/cloud.exe : warning LNK4086: entrypoint "_mainCRTStartup" is not __stdcall with 12 bytes of arguments; image may not run
cloud.obj : error LNK2001: unresolved external symbol _OPENCOMMPORT_V@0
cloud.obj : error LNK2001: unresolved external symbol _LOADCURRENTVANTAGEDATA_V@0
cloud.obj : error LNK2001: unresolved external symbol _GETOUTSIDETEMP_V@0
cloud.obj : error LNK2001: unresolved external symbol _CLOSECOMMANDPORT_V@0
Debug/cloud.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.

cloud.exe - 5 error(s), 2 warning(s)

I think that this may suggest that there's a line in the manufacturers files which is wrongly directing the output, but I can't find it. Can anyone help?

[Steven_L_Intel1]

It looks to me as if the linker thinks that you're trying to build your own DLL with the .DEF file. You shouldn't need both the .DEF and .LIB - just use the .LIB and remove the .DEF from the project.

Steve