Hello everyone,

I am using Visual Studio 2005 to develop C++ DLL (in-process COM). There is
a setting in Linker --> Input called Module definition file. This setting
makes me confused,

1. I have tried that if input a file name (.def), then the generated DLL be
larger than the time when we leave the module definition file to empty.
Should we leave it empty or non-empty (input a .def file name);

2. What is the function of the module definition file? Should developer
write it manually or generated by system.

thanks in advance,
George