You can use keywords in the thunk script to provide information to the thunk compiler beyond that which the C-style type definitions and function prototypes provide. These keywords enable you to optimize DLL loading and parameter translation. The thunk compiler supports the following keywords in the thunk script.
| Keyword | Meaning |
|---|---|
| enablemapdirect1632=true; | Specifies a 16-bit to 32-bit thunk. |
| enablemapdirect3216=true; | Specifies a 32-bit to 16-bit thunk. |
| input | The parameter is used for input only; it is translated when the function is called. |
| output | The parameter is used for output only; it is translated when the function returns. |
| inout | The parameter is used for input and output; it is translated when the function is called and when it returns. |
| faulterrorcode | Specifies the error code when a 16-bit to 32-bit thunk fails because the 32-bit DLL cannot load or initialize. This value is returned when the application calls the first thunk. For more information, see Late Loading. |
| preload32 | Forces the 32-bit thunk DLL to load when the 16-bit thunk DLL is loaded in a 16-bit to 32-bit thunk. |
| preload16 | Not used. Late loading of a 16-bit DLL in a 32-bit to 16-bit thunk is not supported. |
| win31compat | Defers unloading a 32-bit thunk DLL until the process terminates. For more information, see Compatibility with Existing 16-bit DLLs. |