Use the _start_extfn v4 API method as an optional pointer to an initializer function, for which the only argument is a pointer to a_v4_extfn_proc_context structure.
_start_extfn( a_v4_extfn_proc_context * )
Use the _start_extfn method to allocate a structure and store its address in the _user_data field in the a_v4_extfn_proc_context. This function pointer must be set to the null pointer if there is no need for any initialization.
| Parameter | Description |
|---|---|
| cntxt | The procedure context object. |