Problem with Windows Media Player

Question

1.00/5 (2 votes)

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Hello, i want to start my media player but i get error

Error 1 The type 'WMPLib.WMPPlayState' is defined in an assembly that is not referenced. You must add a reference to assembly 'WMPLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. H:\UCILISNO ZVONO\WindowsFormsApplication1\Form1.cs 319 13 WindowsFormsApplication1

Error 3 'WMPLib.IWMPControls' does not contain a definition for 'play' and no extension method 'play' accepting a first argument of type 'WMPLib.IWMPControls' could be found (are you missing a using directive or an assembly reference?) H:\UCILISNO ZVONO\WindowsFormsApplication1\Form1.cs 330 51 WindowsFormsApplication1

C#

private void axWindowsMediaPlayer1_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
{
    axWindowsMediaPlayer2.URL = @"";
    //zavrsila pesnata
    if (axWindowsMediaPlayer2.playState.ToString() != "MediaEnded")
    {
        winmediaplayerstart();
    }
}
private void winmediaplayerstart()
{
    var url = axWindowsMediaPlayer2.URL;
    if (url != "")
    {
        axWindowsMediaPlayer2.URL = @"C:\ZVONO\pesni\OneRepublic - Counting Stars.mp4";
        axWindowsMediaPlayer2.Ctlcontrols.play();
    }
    else
    {
        DirectoryInfo d = new DirectoryInfo(@"" + folderpesni);
        FileInfo[] Files = d.GetFiles("*.mp4");
        foreach (FileInfo file in Files)
        {
            MessageBox.Show(file.Name);
        }
    }

}
private void winmediaplayerstop()
{
    axWindowsMediaPlayer2.Ctlcontrols.pause();
}

Posted 15-Oct-14 12:01pm

Bojmaliev

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Comments

Sergey Alexandrovich Kryukov 15-Oct-14 18:11pm

Did you add the assembly references after seeing Error 1? :-)
—SA

Bojmaliev 15-Oct-14 18:13pm

How to add that?

Sergey Alexandrovich Kryukov 15-Oct-14 18:31pm

Solution Explorer, project node, "Add Reference"...
Look, you apparently don't understand references. If so, you should not do UI development and anything complex, until you learn at least the basics. (Sorry if I just misunderstood you.)
—SA

[no name] 16-Oct-14 12:02pm

A manually added reference is not required if you are dragging the component onto the form Sergey.

Sergey Alexandrovich Kryukov 16-Oct-14 12:19pm

We are talking about programming, not "dragging". It does not matter what you drag or click, the mechanism of referencing is the only thing which is important. After all, you can even add code to the text of the project file and reload it, this is not the essence of things...
—SA

[no name] 16-Oct-14 12:31pm

I am talking about "dragging". Dragging the component from the toolbar to the form does not require a reference. If the OP was creating this component and inheriting it in code, then a using directive reference would probably be required.

May I ask, have you tried to use this component yourself without a reference? If you did, you would see that your advice to use a using directive is irrelevant here.

Sergey Alexandrovich Kryukov 16-Oct-14 12:48pm

This is not what you said in previous comment.
I never said a word about "using". Using is really 1) never required 2) has nothing to do with referencing.
I did not try to use this component without referencing and cannot understand it. Can you explain?
—SA

[no name] 16-Oct-14 13:56pm

That is exactly what I said. Did you think i was implying something else? What is the point of adding a reference if you are not going to inherit the functionality of a referenced DLL by include/using its namespace or class? It would appear that you are the one who does not understand references. What you suggested to the OP makes little to no sense.

Perhaps your explanation to the OP was misleading If I as a programmer cant understand what you meant? Let me try to explain this as best and quickly as I can for you.

This component works practically the same way as the WebBrowser control. The WebBrowser control will function exactly as the version of Internet Explorer installed on the users computer, and the same applies to the Media Player Component.

Which is why a using directive is not required (as you aspired for the OP to do). The same way it would not be required for the Webbrowser control to require a reference of any kind. The functionality for these controls is practically inherited by the installed version on that computer.

In your reply, you said:

Solution Explorer, project node, "Add Reference"...

Most people reading this would assume you are implying that a manual using directive needs to be added after a DLL reference has been added to the project solution. As this is common amongst developers to include the following to their class file after adding a DLL reference to the solution.

VB.NET: Imports Assemblyname.Namespace

OR

C#: Using AssemblyName.Namespace;

For argument and example sake, you cannot use a MySQL connection without adding a using directive to the DLL's client namespace: MySql.Data.MySqlClient even if the referenced MySQL DLL was added to the solution.

I can't think of a single instance you would reference a DLL and not add a using directive to the DLLs Namespace or class within your own project class file to avail of the DLLs functionality. Can you? What you were suggesting to the OP was misleading or badly explained.

Back to the OP's question, As you asked; can i explain?

I can speculate that the issue here might be because the OP has made a user control out of the Media Player Component, which would probably result in these errors.

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Sheepings · Accepted Answer · 2014-10-16T06:20:00

Hi, I will make some suggested changes as a couple of things in your code are not right:
if (axWindowsMediaPlayer2.playState.ToString() != "MediaEnded")

Why are you trying to convert the playstate property to a string? If you want to know what the play state is, you should use the correct methods provided for that event. Like so:

PlayStateChangeEvent

if (axWindowsMediaPlayer2.playState == WMPLib.WMPPlayState.wmppsStopped)<br />
            {<br />
                winmediaplayerstart();<br />
            }

I also don't see where ' folderpesni ' Is defined, so expect an exception on that line. And why are you using the .URL property for a non related url file?

Regarding your playstate and other methods you are trying to use above; are all incorrect.

About the referencing issue on Error 3, I can only conclude you have corrupted your code somewhere; perhaps in your designer.cs file. Try to clean your solution and build it again. (If that does not work, remove the component and re-add it by dragging it to your form.) You may also have to replace the handlers which it may remove in code too.

I would also strongly recommend you to read the documentation on this component before going any further. Documentation.

If you have any questions, please let me know.