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Contents Programming For Parallel Port Device Overview Programmers Guide Scenario I/O Ports control Single read/write operations Data array read/write operations Hardware interrupts handling at user level Common Issues LPT Support Routines Common Procedures OpenRapidLpt IsRapidLptOpened CloseRapidLpt OpenPort ClosePort GetNumLPTs GetPortNumber GetReadMode SetReadMode LPT specific functions Parallel port info GetBasePortAddress GetBaseSpan GetEcpAddress GetEcpSpan GetInterruptVector GetInterruptLevel GetInterruptAffinity GetInterruptMode Parallel port registers GetDataPort SetDataPort GetStatusPort SetStatusPort GetControlPort SetControlPort GetEcrPort SetEcrPort GetEPPAddressPort SetEPPAddressPort GetEPPDataPort SetEPPDataPort Centronix signals GetLptBusy GetLptPaperEnd GetLptSlct GetLptAutofd SetLptAutofd GetLptError LptInit LptSelectIn GetPrinterReady Parallel port modes GetCurrentLptMode SetCurrentLptMode GetIsPresent GetIsPS2Present GetIsEcpPresent Work with pins GetPin SetPin Work with bits GetDataPortBit SetDataPortBit GetStatusPortBit SetStatusPortBit GetControlPortBit SetControlPortBit GetCfgaPortBit SetCfgaPortBit GetCfgbPortBit SetCfgbPortBit GetEcrPortBit SetEcrPortBit Direct Port I/O GetPortByte GetPortWord GetPortLong SetPortByte SetPortWord SetPortLong ReadPortBuffer WritePortBuffer Hardware Interrupts UnmaskLptIrq MaskLptIrq GetInterruptCounter		Scenario Go to RapidDriver Main Page Before using any of the functions of RapidLpt, the driver must be initialized with the help of the function OpenRapidLpt . It must be done once after starting the application. Also resources used by the driver should be cleaned up(driver closed) before the application is closed. Schematic session of using RapidLpt: // initialize(open) the driver   hLpt =  OpenRapidlpt( 0 );    // Check if the driver initialized successfully   if ( IsRapidLptOpened(hLpt)) {         ...    //////////////////////////////////////   /////////  RapidLpt session //////////   /////////  ................ //////////   //////////////////////////////////////   // Free resources used by the driver (close the driver)            hLpt = CloseRapidLpt(hLpt);    }   else     {   // An error happened while opening the driver   MessageBox("Cannot open the driver","Attention!", MB_OK | MB_ICONWARNING);      }   Driver can be initialized by many applications simultaneously, once for each LPT device. The parameter of OpenRapidLpt() can be used to select a device supported by RapidLpt driver.