error C2275 : illegal use of this type as an expression
When you name your source files *.c, MSVC assumes it's compiling C, which means C89. All block-local variables need to be declared at the beginning of the block.
Workarounds include:
- declaring/initializing all local variables at the beginning of a code block (directly after an opening brace
{) - rename the source files to
*.cppor equivalent and compile as C++. - upgrading to VS 2013, which relaxes this restriction.
You might be using a version of C that doesn't allow variables to be declared in the middle of a block. C used to require that variables be declared at the top of a block, after the opening { and before executable statements.
Put braces around the code where the variable is used.
In your case that means:
if (ac > 1){ if (!parse_args(ac, av)) { aff_error(ARGUMENTS); return EXIT_FAILURE; }}{ SERVICE_TABLE_ENTRY DispatchTable[] = {{MY_SERVICE_NAME, ServiceMain}, {NULL, NULL}}; StartServiceCtrlDispatcher(DispatchTable);}