VeriFone e265, Руководство пользователя и передовые методы использования

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A
RCHITECTURE
open()
E
355/
E
265 U
SER AND
B
EST
P
RACTICES
G
UIDE
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open()
This claims ownership of the device. Calling this function also flushes all data and
clears all error conditions in the communication channel. The device names that
can be opened for ports are:
"/DEV/COM1A"
"/DEV/COM1B"
"/DEV/COM1C"
"/DEV/COM1D"
"/DEV/COM1E"
Use
get_port_status()
to get the status of the smart device connection. A
smart device cannot open a communication port until the e355 application has
opened the corresponding device.
Prototype
Int open(const char *devname, int attributes);
Parameters
Return Values Positive integer device handle if successful, or -1 with
errno
set to an error code
if error occurs.
close()
This releases ownership of the device. Calling this function also flushes all data
and clears all error conditions in the communication port.
Prototype
int close(int device_handle) parameters:
Parameters
Return Values Returns 0 for success, -1 with errno set to
EBADF
if device not open.
devname Pointer to the null terminated device name string.
attributes Ignored in this driver.
device_handle The handle returned for the device by the
open()
call.