OpenPortEx

BOOL OpenPortEx(
    LPTSTR     pPortName,
    LPTSTR     pPrinterName,
    LPHANDLE   pHandle,
    LPMONITOR  pMonitor
);

Opens a port for exchange of bi-directional information with the printer connected to a physical port that is managed by port monitor.

Returns TRUE if the operation is successful.

pPortName	Points to the name of the port to open (provided by the caller).
pPrinterName	Points to the name of the printer that is the destination of the print job (provided by the caller).
pHandle	Points to the memory location into which to put the handle to the opened port.
pMonitor	Points to a MONITOR structure.

The port handle that the language monitor puts in the location pointed to by pHandle is used by the print provider in subsequent calls to StartDocPort, WritePort, ReadPort, and EndDocPort.