Msrread - VeriFone MX800 series Programmer's Manual

D D
EVICE RIVERS

msrRead

msrRead
36
M X 800 S P
ERIES ROGRAMMERS
Read the decoded and formatted MSR data. If the device is not opened with the
O_NONBLOCK flag set, this call will be blocked until data is available.
Prototype
int bytes_read = msrRead(char *buffer, int size);
Parameters
Pointer to data area
buffer
Maximum number of bytes to read. Each invocation of read will
size
transfer data from a card reader scan into the buffer.
The format of the buffer returned will be:
c1 s1
where:
c1 a one byte size of c1+s1+d1
s1 a one byte status of reading track 1
d1 any data read in (might not exist)
c2 a one byte size of c2+s2+d2
s2 a one byte status of reading track 2
d2 any data read in (might not exist)
c3 a one byte size of c3+s3+d3
s3 a one byte status of reading track 3
d3 any data read in (might not exist)
The data includes the Start Sentinel, End Sentinel, and the LRC
characters. They were not included in the Omni 7xxx.
G
UIDE
d1 c2 s2 d2 c3 s3 d3