_VCOMM_TransmitCommChar

include vcomm.inc

VxDcall _VCOMM_TransmitCommChar, <hPort, ch>
or      eax, eax
jz      error_handler

Sends a high-priority character to a port, ahead of any data in the transmission queue. Uses the C calling convention. This is an asynchronous service.

• Returns TRUE if successful, FALSE otherwise.

hPort

Handle of a communications resource.

ch

Character to transmit.

With most port drivers, this service does not actually send the character before returning, but instead stores it in a special one-character buffer. The service fails if a character specified in a previous call to _VCOMM_TransmitCommChar has not yet been sent.

See also _VCOMM_GetLastError