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void user_dg_process_message(void *user, window *win, FILE *write_to)
The user has to process whatever user-defined messages are sent to the process. A write-to pipe to the wish process is provided so that the user can directly issue commands there.
| void *user | INOUT | Pointer to the user-defined data structure. |
| window *win | INOUT | The window that received the message. |
| FILE *write_to | IN | Pipe to the wish process. |
| USER_ERROR | Error. Message ignored. |
| USER_SUCCESS | The user processed the message. |