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WinForm.cs

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;   // for PlaySound()
using Microsoft.Win32;   // RegistryKey

namespace PlaySound
{
   /// <summary>
   /// Summary description for WinForm.
   /// </summary>
   public class WinForm : System.Windows.Forms.Form
   {
        private System.Windows.Forms.Label label1;
      private System.Windows.Forms.TextBox tbFileName;
      private System.Windows.Forms.Button buttonPlay;
      private System.Windows.Forms.ComboBox cbUserSound;
      private System.Windows.Forms.Button buttonBrowse;
      private System.Windows.Forms.Label label2;
      private RegistryKey key1;
      private RegistryKey key2;
      private PropertyCollection events;

      // PlaySound()
      [DllImport("winmm.dll", SetLastError=true, CallingConvention=CallingConvention.Winapi)]
         static extern bool PlaySound( string pszSound,
            IntPtr hMod, SoundFlags sf );

      [Flags]
         public enum SoundFlags : int 
      {
         SND_SYNC = 0x0000,  /* play synchronously (default) */
         SND_ASYNC = 0x0001,  /* play asynchronously */
         SND_NODEFAULT = 0x0002,  /* silence (!default) if sound not found */
         SND_MEMORY = 0x0004,  /* pszSound points to a memory file */
         SND_LOOP = 0x0008,  /* loop the sound until next sndPlaySound */
         SND_NOSTOP = 0x0010,  /* don't stop any currently playing sound */
         SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
         SND_ALIAS = 0x00010000, /* name is a registry alias */
         SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
         SND_FILENAME = 0x00020000, /* name is file name */
         SND_RESOURCE = 0x00040004  /* name is resource name or atom */
      }

      /// <summary>
      /// Required designer variable.
      /// </summary>
      private System.ComponentModel.Container components = null;

      public WinForm()
      {
         //
         // Required for Windows Form Designer support
         //
         InitializeComponent();

         //
         // TODO: Add any constructor code after InitializeComponent call
         //
         // Populate combobox with sounds
         // from the registry
         PopulateDropDown();
      }

      /// <summary>
      /// Clean up any resources being used.
      /// </summary>
      protected override void Dispose (bool disposing)
      {
         if (disposing)
         {
            if (components != null)
            {
               components.Dispose();
            }
         }
         base.Dispose(disposing);
      }

      #region Windows Form Designer generated code
      /// <summary>
      /// Required method for Designer support - do not modify
      /// the contents of this method with the code editor.
      /// </summary>
      private void InitializeComponent()
      {
         this.label1 = new System.Windows.Forms.Label();
         this.tbFileName = new System.Windows.Forms.TextBox();
         this.buttonPlay = new System.Windows.Forms.Button();
         this.buttonBrowse = new System.Windows.Forms.Button();
         this.cbUserSound = new System.Windows.Forms.ComboBox();
         this.label2 = new System.Windows.Forms.Label();
         this.SuspendLayout();
         // 
         // label1
         // 
         this.label1.Location = new System.Drawing.Point(16, 16);
         this.label1.Name = "label1";
         this.label1.Size = new System.Drawing.Size(80, 23);
         this.label1.TabIndex = 0;
         this.label1.Text = "Sound File:";
         // 
         // tbFileName
         // 
         this.tbFileName.Location = new System.Drawing.Point(96, 16);
         this.tbFileName.Name = "tbFileName";
         this.tbFileName.Size = new System.Drawing.Size(216, 20);
         this.tbFileName.TabIndex = 1;
         this.tbFileName.Text = "";
         this.tbFileName.TextChanged += new System.EventHandler(this.tbFileName_TextChanged);
         // 
         // buttonPlay
         // 
         this.buttonPlay.Enabled = false;
         this.buttonPlay.Location = new System.Drawing.Point(280, 48);
         this.buttonPlay.Name = "buttonPlay";
         this.buttonPlay.TabIndex = 2;
         this.buttonPlay.Text = "&Play";
         this.buttonPlay.Click += new System.EventHandler(this.buttonPlay_Click);
         // 
         // buttonBrowse
         // 
         this.buttonBrowse.Location = new System.Drawing.Point(328, 16);
         this.buttonBrowse.Name = "buttonBrowse";
         this.buttonBrowse.Size = new System.Drawing.Size(24, 23);
         this.buttonBrowse.TabIndex = 3;
         this.buttonBrowse.Text = "...";
         this.buttonBrowse.Click += new System.EventHandler(this.buttonBrowse_Click);
         // 
         // cbUserSound
         // 
         this.cbUserSound.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
         this.cbUserSound.Items.AddRange(new object[] {
                                              ""});
         this.cbUserSound.Location = new System.Drawing.Point(96, 48);
         this.cbUserSound.Name = "cbUserSound";
         this.cbUserSound.Size = new System.Drawing.Size(168, 21);
         this.cbUserSound.TabIndex = 4;
         this.cbUserSound.SelectedIndexChanged += new System.EventHandler(this.cbUserSound_SelectedIndexChanged);
         // 
         // label2
         // 
         this.label2.Location = new System.Drawing.Point(16, 48);
         this.label2.Name = "label2";
         this.label2.Size = new System.Drawing.Size(80, 23);
         this.label2.TabIndex = 5;
         this.label2.Text = "Sound Events:";
         // 
         // Form1
         // 
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(368, 93);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                        this.label2,
                                                        this.cbUserSound,
                                                        this.buttonBrowse,
                                                        this.buttonPlay,
                                                        this.tbFileName,
                                                        this.label1});
         this.MaximizeBox = false;
         this.Name = "Form1";
         this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
         this.Text = ".NET Sound Player";
         this.ResumeLayout(false);
      }
      #endregion

      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main() 
      {
         Application.Run(new WinForm());
      }

      /// <summary>
      /// Plays selected wave file
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      /// <remarks>If PlaySound can't find the specified file, it tries to
      /// play the default Windows sound.  If it also can't find that, it
      /// returns false</remarks>
      private void buttonPlay_Click(object sender, System.EventArgs e)
      {
         int err = 0;   // last error

         try
         {
            // play the sound from the selected filename
            if (!PlaySound( tbFileName.Text, IntPtr.Zero,
               SoundFlags.SND_FILENAME | SoundFlags.SND_ASYNC ))
               MessageBox.Show(this,
                  "Unable to find specified sound file or default Windows sound");
         }
         catch
         {
            err = Marshal.GetLastWin32Error();
            if (err != 0)
               MessageBox.Show( this,
                  "Error " + err.ToString(),
                  "PlaySound() failed",
                  MessageBoxButtons.OK,
                  MessageBoxIcon.Error );
         }
      }

      private void buttonBrowse_Click(object sender, System.EventArgs e)
      {
         string sysRoot = System.Environment.SystemDirectory;
         OpenFileDialog dlg = new OpenFileDialog();
         dlg.AddExtension = true;
         dlg.Filter = "Wave files (*.wav)|*.wav|All files (*.*)|*.*" ;
         dlg.InitialDirectory = sysRoot + @"\..\Media";   // start in media folder

         // open dialog
         if(dlg.ShowDialog(this) == DialogResult.OK)
         {
            tbFileName.Text = dlg.FileName;
         }
      }

      private void tbFileName_TextChanged(object sender, System.EventArgs e)
      {
         if (tbFileName.Text.Length > 0)
            buttonPlay.Enabled = true;
         else
            buttonPlay.Enabled = false;
      }

      private void PopulateDropDown()
      {
         // fill our PropertyCollection object
         events = GetUserDefinedSounds();

         // disable if no sound events
         if (events.Keys.Count == 0)
            cbUserSound.Enabled = false;
         else
         {
            foreach (string key in events.Keys)
            {
               cbUserSound.Items.Add(key);
            }
         }
      }

      /// <summary>
      /// Retrieves the user-defined sounds from the registry
      /// </summary>
      private PropertyCollection GetUserDefinedSounds()
      {
         string rootKey = "AppEvents\\Schemes\\Apps\\.Default";
         PropertyCollection coll = new PropertyCollection();

         try
         {            
            // open root key
            key1 = Registry.CurrentUser.OpenSubKey(rootKey, false);

            // go through each subkey
            foreach (string subKey in key1.GetSubKeyNames())
            {
               // open subkey
               key2 = key1.OpenSubKey(subKey + "\\.Current", false);
               
               // get filename, if any
               if (key2 != null)
                  if (key2.GetValue(null).ToString().Length > 0)
                     coll.Add(subKey, key2.GetValue(null).ToString());
            }
         }
         catch (Exception ex)
         {
            MessageBox.Show(this, ex.Message, "Yikes!", MessageBoxButtons.OK, MessageBoxIcon.Error);
         }
         finally
         {
            // close keys
            key1.Close();
            key2.Close();
         }
         
         return coll;
      }

      private void cbUserSound_SelectedIndexChanged(object sender, System.EventArgs e)
      {
         // return the filename from the key
         tbFileName.Text = events[cbUserSound.SelectedItem].ToString();
      }
   }
}


发帖时间：8/13/2003 5:01:23 PM

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