[PHP] Problems with writing a stream wrapper to regular fopen/close functions...

John Holmes Sun, 29 Aug 2004 19:18:32 -0700

Is there some fundamental reason that I'm missing that makes this impossible?

Summary: I'm writing a custom stream to wrap around regular fopen/close functions (the actual stream will have more, but this is the part I'm having an issue with). The stream_open() method creates a class variable holding a file handle created with fopen().

$this->fp = fopen($path,$mode);

A var_dump() of $this->fp shows a valid stream resource. However, if I try to use that resource during stream_read, stream_close, stream_eof, etc, it's no longer valid and has been converted to a bool(true) value.

However, another class variable created in the stream_open method retains it's value throughout the other methods. Is this some kind of serialization/sleep/??? issue?

That's the summary, here's the code:

This is the file that defines the custom stream and some of the implementation. Not all methods are implemented, but I don't think that matters to this issue. -------------------- Custom Stream Class: <?php

stream_wrapper_register('cache','CacheStream');

class CacheStream
{
    public $fp = FALSE;
    public $foo = FALSE;

    function stream_open($path, $mode, $options='', &$opened_path='')
    {
        $path = substr($path,8);
        $this->fp = fopen($path,$mode);
        $this->foo = ' Test String ';
        var_dump($this->fp);
        var_dump($this->foo);
        return $this->fp;
    }

    function stream_close()
    {
        var_dump($this->fp);
        var_dump($this->foo);
        return fclose($this->fp);
    }

    function stream_read($bytes)
    {
        var_dump($this->fp);
        var_dump($this->foo);
        return fread($this->fp,$bytes);
    }

    function stream_eof()
    {
        var_dump($this->fp);
        var_dump($this->foo);
        if(feof($this->fp))
        { return TRUE; }
        else
        { return FALSE; }
    }
}

?>
--------------------

This is the test file that implements the custom stream. It first starts with the regular fopen/close functions to show it works with the test.rss file, then moves on to the custom stream. -------------------- Test.php <?php error_reporting(E_ALL);

include('streamtest.php');

if($fp1 = fopen('test.rss','r'))
{ echo 'File1 open<br />'; }
if($c = fread($fp1,20))
{ echo 'Content1: ' . htmlentities($c) . '<br />'; }
if(fclose($fp1))
{ echo 'File1 closed<br />'; }

if($fp2 = fopen('cache://test.rss','r'))
{ echo 'File2 open<br />'; }
if($c = fread($fp2,20))
{ echo 'Content2: ' . htmlentities($c); }
if(fclose($fp2))
{ echo 'File2 closed<br />'; }

?>
--------------------

This is the result:
--------------------
File1 open
Content1: <?xml version="1.0"
File1 closed

resource(6) of type (stream) string(13) " Test String " File2 open bool(true) string(13) " Test String " Warning: fread(): supplied argument is not a valid stream resource in c:\program files\apache group\Apache\htdocs\zorin\streamtest.php on line 31 bool(true) string(13) " Test String " Warning: feof(): supplied argument is not a valid stream resource in c:\program files\apache group\Apache\htdocs\zorin\streamtest.php on line 38 bool(true) string(13) " Test String " Warning: fclose(): supplied argument is not a valid stream resource in c:\program files\apache group\Apache\htdocs\zorin\streamtest.php on line 24 File2 closed --------------------

--

---John Holmes...

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[PHP] Problems with writing a stream wrapper to regular fopen/close functions...

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