MagTek 99875125 - Manual (Page 57)

Section 5. Example Applications
DWORD read_len=0;
char wbuff[1];
char* p;
while (!quit)
{
rs = ReadFile(drv_h, wbuff, sizeof(wbuff), &read_len, &ov_r);
if ( !rs)
{
rs = GetLastError ();
if ( rs != ERROR_IO_PENDING)
{
printf("DeviceIOControl (Read) Error : %i (0x%x)\n", rs, rs );
break;
}
}
rs = WaitForSingleObject ( ov_r.hEvent, INFINITE);
rs = GetOverlappedResult (
drv_h, // handle of file, pipe, or communications device
&ov_r, // address of overlapped structure
&read_len, // address of actual bytes count
FALSE // wait flag
);
if (quit)
break;
if ( rs )
{
p = wbuff;
while (read_len >0)
{
if (*p == 0x1a)
{
quit = TRUE;
printf("\n\nExiting Test...");
break;
}
putch (*p);
++p;
--read_len;
}
}
}
};
// end of file
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