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><H1
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>php_stream_cast</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN85843"
></A
><P
>    (no version information, might be only in CVS)</P
>php_stream_cast&nbsp;--&nbsp;Convert a stream into another form, such as a FILE* or socket</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN85846"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>php_stream_cast</B
> ( php_stream * stream, int castas, void ** ret, int flags)<BR
></BR
><P
>&#13;     <B
CLASS="function"
>php_stream_cast()</B
> attempts to convert <TT
CLASS="parameter"
><I
>stream</I
></TT
> into
     a resource indicated by <TT
CLASS="parameter"
><I
>castas</I
></TT
>.
     If <TT
CLASS="parameter"
><I
>ret</I
></TT
> is NULL, the stream is queried to find out if such a conversion is
     possible, without actually performing the conversion (however, some internal stream state *might*
     be changed in this case).
     If <TT
CLASS="parameter"
><I
>flags</I
></TT
> is set to <TT
CLASS="constant"
><B
>REPORT_ERRORS</B
></TT
>, an error
     message will be displayed is there is an error during conversion.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
         This function returns <TT
CLASS="constant"
><B
>SUCCESS</B
></TT
> for success or <TT
CLASS="constant"
><B
>FAILURE</B
></TT
>
         for failure.  Be warned that you must explicitly compare the return value with <TT
CLASS="constant"
><B
>SUCCESS</B
></TT
>
         or <TT
CLASS="constant"
><B
>FAILURE</B
></TT
> because of the underlying values of those constants. A simple
         boolean expression will not be interpreted as you intended.
        </P
></BLOCKQUOTE
></DIV
><P
>&#13;     <DIV
CLASS="table"
><A
NAME="AEN85877"
></A
><P
><B
>Tabla 43-1. Resource types for <TT
CLASS="parameter"
><I
>castas</I
></TT
></B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Value</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Meaning</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_STREAM_AS_STDIO</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Requests an ANSI FILE* that represents the stream</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_STREAM_AS_FD</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Requests a POSIX file descriptor that represents the stream</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_STREAM_AS_SOCKETD</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Requests a network socket descriptor that represents the stream</TD
></TR
></TBODY
></TABLE
></DIV
>
    </P
><P
>&#13;     In addition to the basic resource types above, the conversion process can be altered by using the
     following flags by using the OR operator to combine the resource type with one or more of the
     following values:
     <DIV
CLASS="table"
><A
NAME="AEN85896"
></A
><P
><B
>Tabla 43-2. Resource types for <TT
CLASS="parameter"
><I
>castas</I
></TT
></B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Value</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Meaning</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_STREAM_CAST_TRY_HARD</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Tries as hard as possible, at the expense of additional resources, to ensure that the conversion succeeds</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_STREAM_CAST_RELEASE</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Informs the streams API that some other code (possibly a third party library) will be responsible for closing the
         underlying handle/resource.  This causes the <TT
CLASS="parameter"
><I
>stream</I
></TT
> to be closed in such a way the underlying
         handle is preserved and returned in <TT
CLASS="parameter"
><I
>ret</I
></TT
>.  If this function succeeds, <TT
CLASS="parameter"
><I
>stream</I
></TT
>
         should be considered closed and should no longer be used.
         </TD
></TR
></TBODY
></TABLE
></DIV
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
      If your system supports <B
CLASS="function"
>fopencookie()</B
> (systems using glibc 2 or later), the streams API
      will always be able to synthesize an ANSI FILE* pointer over any stream.
      While this is tremendously useful for passing any PHP stream to any third-party libraries, such behaviour is not
      portable.  You are requested to consider the portability implications before distributing you extension.
      If the fopencookie synthesis is not desireable, you should query the stream to see if it naturally supports FILE*
      by using <B
CLASS="function"
>php_stream_is()</B
>
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
      If you ask a socket based stream for a FILE*, the streams API will use <B
CLASS="function"
>fdopen()</B
> to
      create it for you.  Be warned that doing do may cause data that was buffered in the streams layer to be
      lost if you intermix streams API calls with ANSI stdio calls.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <B
CLASS="function"
>php_stream_is()</B
> and <B
CLASS="function"
>php_stream_can_cast()</B
>.
    </P
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