C#でMusic Playerを作ろう 1

　以前から思っていたのですが、パソコンで音楽を再生するソフトは重たいです。Windows Media Playerとか、Quick Timeとかですね。ただ、BGMが欲しいだけなのに。変な視覚エフェクトとか、ネットワークから情報を集めてきたりとか、そういうのはいらないんですが。。。

　というわけで、音楽再生のソフトを作ろうと思います。まぁ、Win32APIのmciSendString関数を使うだけの簡単なソフトです。

　手始めに、mciSendString関数を使って、色々試してみました。

　Statusの変化するタイミングとか、PauseとStopの違いとか、使ってみないと分からないこともあるもんです。面白かったのが、Volumeの設定です。Volumeは0-1000で変化するみたいですが、例えば800に設定しようとしても803になったりしました。ハードウェアの都合なのかもしれません。へぇー。

　ソースコードはご自由にご利用ください。ただし、趣味のプログラムなので保証はありません。

　(ちなみに、メニューを作っているのは、ウィルス対策ソフトと戦ったからです。)

using System;

using System.IO;

using System.Text;

using System.Drawing;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Collections.Generic;

/*--------------------------------------------------*/

class Program

{

[STAThread]

static void Main()

{

Application.Run( new MciTest());

}

}

/*--------------------------------------------------*/

class MciTest: Form

{

/*--------------------------------------------------*/

[DllImport( "Winmm.dll")]

extern static int mciSendString( string cmd, System.Text.StringBuilder retStr, uint ret, IntPtr hwnd);

/*--------------------------------------------------*/

private MenuStrip ms;

private ToolStripMenuItem[][] tsmi;

private Button[] btn;

private const string DeviceID = "mysound";

private string filename = @"C:\Windows\Media\Alarm02.wav";

/*--------------------------------------------------*/

public MciTest()

{

/*--------------------------------------------------*/

this.ClientSize = new Size( 360, 240);

this.Text = "MCITest";

this.Load += new EventHandler( this.Form_Load);

this.Closed += new EventHandler( this.Form_Closed);

/*--------------------------------------------------*/

this.CreateMenu();

/*--------------------------------------------------*/

this.btn = new Button[16];

for( int i = 0; i < this.btn.Length; i++)

{

this.btn[i] = new Button();

this.btn[i].SetBounds( 20 + 80 * ( i % 4), 40 + 40 * ( i / 4), 80, 40);

this.btn[i].Anchor = AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Right | AnchorStyles.Bottom;

this.btn[i].Text = i.ToString();

this.btn[i].Click += new EventHandler( this.btn_Click);

this.Controls.Add( this.btn[i]);

}

this.btn[0].Text = "open";

this.btn[1].Text = "close";

this.btn[2].Text = "play";

this.btn[3].Text = "stop";

this.btn[4].Text = "pause";

this.btn[5].Text = "resume";

this.btn[6].Text = "seek";

this.btn[7].Text = "position";

this.btn[8].Text = "volume quiet";

this.btn[9].Text = "volume loud";

this.btn[10].Text = "audio on";

this.btn[11].Text = "audio off";

this.btn[12].Text = "info";

this.btn[13].Text = "mode";

}

/*--------------------------------------------------*/

private void Form_Load( object sender, EventArgs e)

{

Console.WriteLine( "Form_Load");

}

private void Form_Closed( object sender, EventArgs e)

{

Console.WriteLine( "Form_Closed");

int ret;

string cmd;

cmd = "stop " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

cmd = "close " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

}

/*--------------------------------------------------*/

private void CreateMenu()

{

this.ms = new MenuStrip();

this.tsmi = new ToolStripMenuItem[1][];

this.tsmi[0] = new ToolStripMenuItem[3];

for( int i = 0; i < this.tsmi.Length; i++)

{

for( int j = 0; j < this.tsmi[i].Length; j++)

{

this.tsmi[i][j] = new ToolStripMenuItem();

}

}

this.tsmi[0][0].Text = "Menu (&M)";

this.tsmi[0][1].Text = "File (&F)";

this.tsmi[0][2].Text = "Close (&C)";

for( int i = 0; i < this.tsmi.Length; i++)

{

this.ms.Items.Add( this.tsmi[i][0]);

for( int j = 1; j < this.tsmi[i].Length; j++)

{

this.tsmi[i][0].DropDownItems.Add( this.tsmi[i][j]);

this.tsmi[i][j].Click += new EventHandler( this.Menu_Click);

}

}

this.Controls.Add( this.ms);

this.MainMenuStrip = ms;

}

/*--------------------------------------------------*/

private void Menu_Click( object sender, EventArgs e)

{

Console.WriteLine( sender.ToString());

if( sender == this.tsmi[0][1])

{

MessageBox.Show( Application.ExecutablePath);

OpenFileDialog ofd = new OpenFileDialog();

ofd.Filter = "All files | *.*";

ofd.Multiselect = true;

if( ofd.ShowDialog() == DialogResult.OK)

{

MessageBox.Show( ofd.FileNames[0]);

this.filename = ofd.FileNames[0];

}

}

else if( sender == this.tsmi[0][2])

{

this.Close();

}

}

/*--------------------------------------------------*/

private void btn_Click( object sender, EventArgs e)

{

Console.WriteLine( "btn_Click" + "\t" + ( (Button)sender).Text);

int ret;

string cmd;

StringBuilder retStr = new StringBuilder( 256);

if( ( (Button)sender).Text == "open")

{

cmd = "open " + "\"" + this.filename + "\"" + " alias " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "close")

{

cmd = "close " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "play")

{

cmd = "play " + MciTest.DeviceID + " notify";

ret = mciSendString( cmd, null, 0, this.Handle);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "stop")

{

cmd = "stop " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "pause")

{

cmd = "pause " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

cmd = "status " + MciTest.DeviceID + " pause timeout";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "pause timeout : " + retStr);

}

else if( ( (Button)sender).Text == "resume")

{

cmd = "resume " + MciTest.DeviceID;

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "seek")

{

cmd = "seek " + MciTest.DeviceID + " to start";

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "position")

{

cmd = "status " + MciTest.DeviceID + " position";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.Write( "position : " + retStr);

cmd = "status " + MciTest.DeviceID + " length";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( " / " + retStr);

}

else if( ( (Button)sender).Text == "volume quiet")

{

cmd = "status " + MciTest.DeviceID + " volume";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "volume : " + retStr);

cmd = "setaudio " + MciTest.DeviceID + " volume to 200";

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

cmd = "status " + MciTest.DeviceID + " volume";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "volume : " + retStr);

}

else if( ( (Button)sender).Text == "volume loud")

{

cmd = "status " + MciTest.DeviceID + " volume";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "volume : " + retStr);

cmd = "setaudio " + MciTest.DeviceID + " volume to 800";

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

cmd = "status " + MciTest.DeviceID + " volume";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "volume : " + retStr);

}

else if( ( (Button)sender).Text == "audio on")

{

cmd = "set " + MciTest.DeviceID + " audio all on";

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "audio off")

{

cmd = "set " + MciTest.DeviceID + " audio all off";

ret = mciSendString( cmd, null, 0, IntPtr.Zero);

Console.WriteLine( cmd);

}

else if( ( (Button)sender).Text == "info")

{

cmd = "info " + MciTest.DeviceID + " file";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "info : " + retStr);

}

else if( ( (Button)sender).Text == "mode")

{

cmd = "status " + MciTest.DeviceID + " mode";

ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);

Console.WriteLine( "mode : " + retStr);

}

}

/*--------------------------------------------------*/

protected override void WndProc( ref Message m)

{

base.WndProc( ref m);

if( m.Msg == 0x03B9) //MM_MCINOTIFY message

{

Console.WriteLine( "Notify");

StringBuilder retStr = new StringBuilder( 256);

string cmd = "status " + MciTest.DeviceID + " mode";;

int ret = mciSendString( cmd, retStr, (uint) retStr.Capacity, IntPtr.Zero);;

Console.WriteLine( "mode : " + retStr);

}

}

}