dio_open
I am using dio functions on windows to read RS232 port.
I can read/write but it seems that the write function cannot be binary.
In particular:
dio_write($com1,chr(10),1); will result in writing 2 bytes 0D 0A be cause \n is translated to \r\n. I have not found any way to overcome this limitation so far
dio_read
(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)
dio_read — Reads bytes from a file descriptor
Description
string dio_read
( resource
$fd
[, int $len = 1024
] )
The function dio_read() reads and returns
len bytes from file with descriptor
fd.
Parameters
-
fd -
The file descriptor returned by dio_open().
-
len -
The number of bytes to read. If not specified, dio_read() reads 1K sized block.
Return Values
The bytes read from fd.
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User Contributed Notes
dio_read - [2 notes]
alban ¶
4 years ago
matt at vhub dot com ¶
7 years ago
Note that dio_read on Windows (other platforms unknown) will not timeout if there is no data to read. There is no way to specify a timeout or do a non-blocking read on Windows.