Databases
StackOverflow2013
Postsdbo
PObasic playback with programmatically created windows media player
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PObasic playback with programmatically created windows media player
    primarykey
    data
    text
    <p>I was trying to <em>"just quickly integrate"</em> the Windows Media Player via COM to play single files from the local file system or http sources - but due to the sparse documentation and online resources to its usage when not embedding into some kind of an Ole container, i couldn't get that supposedly trivial use-case to work.</p> <p>Initialization etc. works fine, but actually playing some file always fails.</p> <p>Example code, starting with initialization (error handling stripped, basically translated from the <a href="http://msdn.microsoft.com/en-us/library/dd562692(VS.85).aspx" rel="nofollow noreferrer">C# example at MSDN</a>, executed on the main thread):</p> <pre><code>CComPtr&lt;IWMPPlayer&gt; player; player.CoCreateInstance(__uuidof(WindowsMediaPlayer), 0, CLSCTX_INPROC_SERVER); CComQIPtr&lt;IWMPCore3&gt; core(player); CComPtr&lt;IWMPControls&gt; controls; core-&gt;get_controls(&amp;controls); CComPtr&lt;IWMPPlaylist&gt; playlist; core-&gt;get_currentPlaylist(&amp;playlist); CComBSTR path("c:\\bar.mp3"); // alternatively http://foo/bar.mp3 </code></pre> <p>The first approach to play something gives <em>"command not available"</em>:</p> <pre><code>core-&gt;put_url(path); // ... waiting after that for WMP to load doesn't make a difference controls-&gt;play(); // returns 0x000D1105 - NS_S_WMPCORE_COMMAND_NOT_AVAILABLE </code></pre> <p>The second approach only produces <code>S_OK</code>s, but nothing is actually played:</p> <pre><code>CComPtr&lt;IWMPMedia&gt; media; core-&gt;newMedia(path, &amp;media); playlist-&gt;appendItem(media); controls-&gt;playItem(media); // returns S_OK, but doesn't play </code></pre> <p>Another thing i noted is that <code>core-&gt;get_playState()</code> always returns <code>wmposMediaOpening</code>, no matter how long i wait.</p> <p>I've stumbled upon one thread that suggests multi-threading might not work properly with WMP and this code runs in a multi-threaded apartment. Might that be the problem?<br> If not, what else could be preventing WMP from playing the files?</p> <p><em>Notable background:</em><br> The WMP instance is created in a DLL with a browser as the host-process.</p> <p><em>Update:</em><br> Trying plain DirectShow, which WMP should be using itself, exhibits a more specific problem - see the <a href="https://stackoverflow.com/questions/1963241/">question for that</a>.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USGeorg Fritzsche
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PObasic playback with programmatically created windows media player
      1. USmeklarian
      1. VTFavorite
    2. VO
      singulars
      1. PObasic playback with programmatically created windows media player
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PObasic playback with programmatically created windows media player
      1. UStaxilian
      1. VTFavorite
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload