Intermec CN2B Manual do Utilizador descarregar pdf (Página 134)

Chapter 5 — Printer Support

116 CN2B Mobile Computer User’s Manual

4 Use WriteFile(); to write your data to the printer. Check for errors and

that all data were written. Use IOCTL_NPCP_ERROR to get the

extended error. If the error is critical in nature, use

IOCTL_NPCP_CLOSE, followed by CloseFile(), to end the communi-

cations session. Start a new session, beginning with step 1 to ensure

proper printing. For noncritical errors display the error and retry the

operation.

5 After all data is sent to the printer, ensure that the printer continues to

print the report properly by polling the printer’s status. Use

IOCTL_NPCP_FLUSH to poll the printer’s status. If an error is

reported by the IOCTL, then use IOCTL_NPCP_ERROR to get the

error and determine the correct recovery procedure.

Sample Code

See sample code in the “\CN2B Dev Tools\Installable Drivers\Port Driv-

ers\Npcp\NPCPPrint\” directory for more details on printing, printer com-

munications and error code handling.

NPCP Error Codes

Call the IOCTL_NPCP_ERROR I/O control function to receive PL/N

compatible error codes. Applications must decide how to act upon the data

returned.

// Definition of NPCP communications Errors and Printer Errors

#define PNRDY (BYTE)102 // link not ready error

#define RXTMO (BYTE)104 // link no receive error

#define TXTMO (BYTE)106 // link no transmit error

#define BADADR (BYTE)111 // frame address error

#define GAPERR (BYTE)112 // link gap error (timeout) in receive data

#define LSRPE (BYTE)113 // frame parity error on length field

#define IFTS (BYTE)120 // session layer - invalid frame this state

#define NS_NE_VR (BYTE)121 // session layer sequence error

#define NR_NE_VS (BYTE)122 // session layer sequence error

#define MAC_CRCERR (BYTE)124 // MAC CRC error

#define RLENERR (BYTE)123 // MAC too much data received

#define FRMERR (BYTE)200 // Frame Reject

#define FRMERR_IF (BYTE)201 // Frame Reject - Invalid Frame

#define FRMERR_NR (BYTE)202 // Frame Reject - NR Mismatch

#define FRMERR_NS (BYTE)203 // Frame Reject - NS Mismatch

#define NDMERR (BYTE)204 // Normal Disconnect mode error

#define BINDERR (BYTE)210 // bind error

#define IPLDUR (BYTE)221 // invalid presentation layer response

#define HEADJAM (BYTE)222 // printer head jam

#define PAPEROUT (BYTE)223 // printer paper out

#define LOWVOLTS (BYTE)224 // printer low voltage

#define HIVOLTS (BYTE)225 // printer over voltage

#define LOWBAT (BYTE)226 // printer low battery

#define COVEROFF (BYTE)227 // printer cover off error

#define HEADFAULT (BYTE)228 // printer head short or driver short error

#define PFFAULT (BYTE)229 // paper feed motor fault.

#define FRAME_NOT_ACKED 0x8000 // frame was not received by printer and need to

be resent.

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