_VCOMM_EnableCommNotification

include vcomm.inc

VxDcall _VCOMM_EnableCommNotification, <hPort, \
    <OFFSET32 CommNotifyProc>, lReferenceData>
or      eax, eax
jz      error_handler

Registers a callback function for event notification. Uses the C calling convention.

• Returns TRUE if successful, FALSE otherwise. For extended error information, use _VCOMM_GetLastError.

hPort

Handle of a communications resource.

CommNotifyProc

Address of a client-defined callback function that the port driver calls when an event enabled by the _VCOMM_SetCommEventMask service occurs. For more information, see CommNotifyProc. Can be NULL to disable notification.

lReferenceData

A client-defined 32-bit value that is passed to the notification function.

See also CommNotifyProc, _VCOMM_GetLastError, _VCOMM_SetCommEventMask