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.
dio_read
(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_read — Reads bytes from a file descriptor
Description
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 2 notes
matt at vhub dot com ¶
18 years ago
alban ¶
15 years ago
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
