Port monitor server DLL functions

The following table lists the functions that a port monitor server DLL must define:

Function name	Description
DllEntryPoint	DLL entry point, typically called DllMain.
ClosePort	Closes a port if there are no printers connected to it.
EndDocPort	Performs end-of-print-job tasks on a port.
EnumPorts	Enumerates the ports available for printing on a server.
InitializePrintMonitor2	Initializes the print monitor and returns an instance handle.
OpenPort	Opens a printer port.
OpenPortEx	Opens a printer port. (Language monitor only)
ReadPort	Reads data from a printer port.
StartDocPort	Performs the tasks required to start a print job on a port.
WritePort	Writes data to a printer port.
XcvClosePort	Closes a port after port management is complete.
XcvDataPort	Handles port management tasks.
XcvOpenPort	Opens a port for management purposes.

The following port monitor server DLL functions are optional:

Function name	Description
GetPrinterDataFromPort	Sends an I/O control code to a port driver and returns the result.
SendRecvBidiDataFromPort	Supports bidirectional communication between an application and a printer or print server.
SetPortTimeOuts	Sets a time-out value on an open port.
Shutdown	Deletes a monitor instance. This function is required for cluster support.