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dio_read

(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)

dio_read — 从文件描述符读取字节

说明

dio_read(resource $fd, int $len = 1024): string

dio_read() 函数读取并返回描述符 fd 指定文件中的 len 字节。

参数

fd: 由 dio_open() 返回的文件描述符。
len: 要读取的字节数。如果未指定，dio_read() 读取 1K 大小的块。

返回值

从 fd 读取的字节。

参见

dio_write() - 截取可选长度的数据写入文件

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User Contributed Notes 2 notes

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matt at vhub dot com ¶

18 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.

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-7

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

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