Why are C DLL exported function names sometimes decorated, and how can I export undecorated names?

C DLL Export: Decorated/Mangled Names

In C DLL development, it is expected that exported function names appear undecorated after compilation. However, encountering decorated function names with additional characters may raise concerns.

Cause of Decoration

The decoration seen is a result of the compiler's name mangling process. When compiling C code, the compiler modifies function names to ensure uniqueness across overloaded functions or different compilation units. This mangling includes additional characters and symbols.

Solution Using Pragma Comment

To export undecorated function names, without using a module definition file, a pragma comment can be inserted:

Alternatively, to obtain the decorated function name automatically:

Equivalent Extern "C" with Declaration Specifier

Another approach is to use extern "C" with a declaration specifier:

However, this method still results in the same decorated function name.

Eliminating the Postfix

Unfortunately, the post "=" decoration cannot be eliminated without using a module definition file or pragma comment. This postfix indicates the decorated version of the function.

Workaround for C# Applications

While the undecorated names are preferred, P/Invoke calls in C# can still be made using the decorated function name. To do so, include the fully decorated name when invoking the function.

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