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<DIV><FONT face=Arial size=2>I always find it easier to wrap native code inside
C++.NET managed code... so you can expose the managed interface and C++.NET lets
you run native code within that code. I don't like using interop for porting
entire API's... it's mainly good for one off function calls.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>You problem is probably because you are trying to
get a native callback to invoke a managed one.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>You can find various utility functions to help with
exposing native code to managed code here.</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://svn.xiph.org/trunk/oggdsf/src/lib/helper/libiWrapper/">http://svn.xiph.org/trunk/oggdsf/src/lib/helper/libiWrapper/</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you go up a few directories and have a look
around there's several examples of other native code being exposed to .NET in
this way (look for directories ending in DotNET).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Specifically for the callback problem you need a
callback proxy.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>An example of one is here</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://svn.xiph.org/trunk/oggdsf/src/lib/player/libDSPlayDotNET/CMMLCallbackProxy.cpp">http://svn.xiph.org/trunk/oggdsf/src/lib/player/libDSPlayDotNET/CMMLCallbackProxy.cpp</A></FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://svn.xiph.org/trunk/oggdsf/src/lib/player/libDSPlayDotNET/CMMLCallbackProxy.h">http://svn.xiph.org/trunk/oggdsf/src/lib/player/libDSPlayDotNET/CMMLCallbackProxy.h</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Incidentally that library libDSPlay is a ready made
.NET media player class... if you install my ogg codecs from <A
href="http://www.illiminable.com/ogg/">www.illiminable.com/ogg/</A> you can use
that .NET class to play any media file on windows including all the ogg files ie
speex, vorbis flac and theora.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Zen.</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Adam.Langley@adis.co.nz
href="mailto:Adam.Langley@adis.co.nz">Langley, Adam</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=vorbis@xiph.org
href="mailto:vorbis@xiph.org">vorbis@xiph.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, June 09, 2005 9:56
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Vorbis] c# source to interop
call vorbisfile.dll</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Can anyone tell me where I can get
sample C# code to call the native (win32) dll vorbisfile.dll to decode a
vorbis Stream?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I want the native performance of
this methodology, however Ive tried porting the invocation code to C# and keep
getting null reference errors when<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Calling
ov_open_callback.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> -
Adam<o:p></o:p></SPAN></FONT></P></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Vorbis mailing
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