midl /cstub stub_file_name
midl /cstub my_cstub.c filename.idl
The /cstub switch specifies the name of the client stub file for an RPC interface. The specified filename replaces the default filename. By default, the filename is obtained by adding the extension _C.C to the name of the IDL file. This switch does not affect OLE interfaces.
When you are importing files, the specified filename applies to only one stub file — the stub file that corresponds to the IDL file specified on the command line.
If stub_file_name does not include an explicit path, the file is written to the current directory or the directory specified by the /out switch. An explicit path in stub_file_name overrides the /out switch specification.
The /client none switch takes precedence over the /cstub switch.
/header, General MIDL Command-line Syntax, /out, /sstub