int UngetCommChar(nCid,cChar)
This function places the character specified by the cChar parameter back into the receive queue, making this character the first to be read on a subsequent read from the queue.
Consecutive calls to the UngetCommChar function are not allowed. The character placed back into the queue must be read before attempting to place another.
| Parameter | Type/Description |
| nCid | int Specifies the communication device to receive the character. | |
| cChar | char Specifies the character to be placed in the receive queue. |
The return value specifies the outcome of the function. It is zero if the function is successful. It is negative if an error occurs.