Important: The information in this document is obsolete and should not be used for new development.
SerGetBuf
You can use theSerGetBuf
function to determine the number of characters available in the driver's input buffer.
FUNCTION SerGetBuf (refNum: Integer; VAR count: LongInt): OSErr;
refNum
- The driver reference number of the serial input driver.
count
- On exit, the number of characters in the input buffer.
DESCRIPTION
TheSerGetBuf
function returns, in thecount
parameter, the number of characters present in the input buffer.ASSEMBLY-LANGUAGE INFORMATION
TheSerGetBuf
function is equivalent to a Device Manager status request with acsCode
value of 2. Thecount
value is returned incsParam
as a long word (csParam[0]
=count
).RESULT CODES
noErr 0 No error