I have a list of videos, supposed to run in WMP control in endless loop (with some specialties like shuffle after playing one block, some special videos on demand...). After a while which is not determined (something about 20 minutes), the control remains black, showing no video, having no play state changes anymore.
I found out that usually there is a certain sequence of actions and events (see code below). And if this sequence is broken and WMP goes directly from wmppsPlaying to wmppsReady, the point of no return is reached: My only solution is to restart the whole exe. (I also tried disposing and re-creating WMP object as well as disposing and re-creating the whole form object). As found here and referenced here and here, I also did not do any actions directly in event handler, but invoking them for delay.
private void Play(string file)
{
this.player.Ctlcontrols.stop();
this.ClearPlaylist();
this.player.stretchToFit = true;
this.player.uiMode = "none";
this.player.URL = file;
this.player.Ctlcontrols.playItem(this.player.Ctlcontrols.currentItem);
this.player.Ctlcontrols.play();
}
private void ClearPlaylist()
{
// try to avoid memory or state issues
IWMPPlaylistArray playlist = this.player.playlistCollection.getAll();
for (int i = 0; i < playlist.count; i++)
{
this.player.playlistCollection.remove(playlist.Item(i));
}
}
private void player_PlayStateChange(object sender, _WMPOCXEvents_PlayStateChangeEvent e)
{
/* usual sequence as logged:
* x-1: last/running video
* x: next video to play
* x+1: video after that...
* GetNextVideo x
* 9 x-1
* 10 x-1
* 9 x-1
* play Video x
* 10 x
* 3 x
* 8 x
* GetNextVideo x+1
* 9 x
* 10 x
* 9 x
* play Video x+1
* 10 x+1
* 3 x+1
* 8 x+1
*/
this.BeginInvoke((MethodInvoker)(() => this.VideoPlayerStatusChange(e.newState)));
}
private void VideoPlayerStatusChange(WMPPlayState newState)
{
if (!this.m_Restart && !this.m_IgnorePlayerEvent) // ignore cases with change state, but require no further action
{
if (this.m_LastPlayState == WMPPlayState.wmppsPlaying && newState == WMPPlayState.wmppsReady)
{
// weird: After that, player remains black and blocked, nothing happens any more
// what can be done now?
// here I do a restart of exe. which cannot be the best solution ever...
}
else
{
if (newState == WMPPlayState.wmppsMediaEnded || newState == WMPPlayState.wmppsStopped)
{
// video finished normal way: GetNextVideo and play that
this.PlayNextVideo();
}
if (newState == WMPPlayState.wmppsReady && !String.IsNullOrEmpty(this.player.URL)) // teilw. s. o.
{
// player is ready, video loaded: play it.
this.player.Ctlcontrols.play();
}
}
this.m_LastPlayState = newState;
}
}
private void PlayNextVideo()
{
Video video = this.GetNextVideo();
if (video != null)
{
this.Play(video);
}
}
And there might be some more cases, in which the player hangs. (Currently I have an overnight-test running to figure out the next point of no return.)
How can I avoid WMP hanging? If it hangs, how can I make it run again (without restarting the exe)? Did I miss something else, which avoids that strange behaviour?
