Intermec CN2B Manual de usuario descargar pdf (Pagina 136)

Chapter 5 — Printer Support

118 CN2B Mobile Computer User’s Manual

The first parameter “DTR1:” must reflect the device name and index used

in the RegisterDevice() function call.

The function call will fail for any of the following reasons:

• The port associated with the device during RegisterDevice() is currently

in use.

• The DTR device is already open.

• The share mode is not set to zero. The device cannot be shared.

• Access permissions are not set to GENERIC_WRITE.

Closing the DTR Driver

Using the CloseHandle() (hFile) function closes the DTR driver. Where

hFile is the handle returned by the CreateFile() function call.

• TRUE indicates the device is successfully closed.

• FALSE indicates an attempt to close a NULL HANDLE or an already

closed device.

Writing to the DTR Driver

You can use the WriteFile() function to send all Print data to the printer.

The print data being written must contain the proper formatting printer

commands.

DTR Printer Communications

All DTR printer communications should be based on the following flow:

1 Use CreateFile() to open the printer driver.

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

that all data were written.

3 Use CloseHandle() to close the driver.

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Intermec CN2B Manual de usuario Pagina 136