pinvoke.net: Edit: winmm.mciSendString

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Summary: The mciSendString function sends a command string to an MCI device. The device that the command is sent to is specified in the command string [This page was changed by iMpostoR]

!!!!C# Signature:
 [DllImport("winmm.dll")]
 static extern Int32 mciSendString(string command, StringBuilder buffer, int bufferSize, IntPtr hwndCallback);

!!!!VB.NET Signature:
 <DllImport("winmm.dll")> _
 Private Shared Function mciSendString(ByVal command As String, ByVal buffer As StringBuilder, ByVal bufferSize As Integer, ByVal hwndCallback As IntPtr) As Integer
 End Function

!!!!VB Signature:
 Declare Ansi Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal command As String, ByRef buffer As StringBuilder, ByVal bufferSize As Integer, ByVal hWndCallback As IntPtr) As Integer

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code
C#
 // Open CD-ROM Drive Door
 public void OpenCD()
 {
	IntPtr ptr = IntPtr.Zero;
	StringBuilder returnstring = new StringBuilder();
	mciSendString("set CDAudio door open", returnstring,127, IntPtr.Zero);
 }
----
 // Open Media File
 string sCommand = "open \"" + strFilePath + "\" type mpegvideo alias MediaFile";
 mciSendString(sCommand, null, 0, 0);

// Play the Media File
 sCommand = "play MediaFile notify";
 // _frmObject is your form that will handle the notification messages
 mciSendString(sCommand, null, 0, _frmObject.Handle.ToInt64());

// Declare the notify constant
 public const int MM_MCINOTIFY = 953;

// Override the WndProc function in the form
 protected override void WndProc(ref Message m) 
 {
	if (m.Msg == MM_MCINOTIFY)
	{
		// The file is done playing, do whatever
	}

base.WndProc(ref m);
 }

Or try something like that:

[DllImport("winmm.dll")]
 static extern Int32 mciSendString(string command, string buffer, int bufferSize, IntPtr hwndCallback);

private void EjectCdCommand()
 {
     string rt = "";
     mciSendString("set CDAudio door open", rt, 127, IntPtr.Zero);
 }

private void CloseCdCommand()
 {
     string rt = "";
     mciSendString("set CDAudio door closed", rt, 127, IntPtr.Zero);
 }
----
VB.NET
 ' Open CD-ROM Drive Door
 Public Sub OpenCDDoor()
     Dim returnstring As StringBuilder = New StringBuilder()
     mciSendString("set CDAudio door open", returnstring, 127, IntPtr.Zero)
     MsgBox(returnstring)
 End Sub

----

' Declare the notify constant
 Public Const MM_MCINOTIFY As Integer = 953

' Open and play a media file
 Public Sub OpenMediaFile(ByVal strFilePath As String)
     ' Open the media file
     Dim sCommand As String = "open """ + strFilePath + """ type waveaudio alias MediaFile"
     mciSendString(sCommand, Nothing, 0, IntPtr.Zero)

' It's is assumed this function is in a Form so Me points to the current instance of the form
     sCommand = "play MediaFile notify"
     mciSendString(sCommand, Nothing, 0, Me.Handle.ToInt64())
 End Sub

' Override the WndProc function which is called when the play function ends
 Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
     If m.Msg = MM_MCINOTIFY Then
         ' The file is done playing, do whatever is necessary at this point
         MsgBox("Done playing.")
     End If
     MyBase.WndProc(m)
 End Sub

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

Documentation: mciSendString@msdn on MSDN