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NAME
- PRead
-
internal read from printer port
SYNOPSIS
error = (*PrinterData->pd_PRead)(buffer, length, tv);
D0
LONG PRead(UBYTE *, ULONG *, struct timeval *);
D0
LONG PRead(UBYTE *, ULONG *, struct timeval *);
FUNCTION
PRead reads a buffer of data from the printer port. The variable length points to is set to the actual number of read bytes.
tv points to a struct timeval or is NULL in which case the default time is PrinterExtendedData.ped_TimeoutSecs. If the time of tv ellapes before the CMD_READ at the printer port is done two different things may happen: If at least one char is read PRead() returns. If no char is read but PQuery returns a value larger 0 the read is repeated with that length to read all outstanding data.
tv points to a struct timeval or is NULL in which case the default time is PrinterExtendedData.ped_TimeoutSecs. If the time of tv ellapes before the CMD_READ at the printer port is done two different things may happen: If at least one char is read PRead() returns. If no char is read but PQuery returns a value larger 0 the read is repeated with that length to read all outstanding data.