如何使用平台调用播放 WAV 文件(C# 编程指南)
下面的 C# 代码示例说明了如何使用平台调用服务在 Windows 操作系统中播放 WAV 声音文件。
示例
此示例代码使用 DllImportAttribute 将 winmm.dll
的 PlaySound
方法入口点导入为 Form1 PlaySound()
。 本示例具有一个带按钮的简单 Windows 窗体。 单击该按钮将打开一个标准的 Windows OpenFileDialog 对话框,以便你可以打开要播放的文件。 选中波形文件后,该文件将使用 winmm.dll 库的 PlaySound()
方法播放。 有关此方法的详细信息,请参阅使用 PlaySound 功能处理波形音频文件。 浏览并选择具有 .wav 扩展名的文件,然后单击“打开”以使用平台调用播放波形文件。 文本框中显示所选文件的完整路径。
通过筛选器设置对“打开文件”对话框进行筛选,以仅显示扩展名为 .wav 的文件:
dialog1.Filter = "Wav Files (*.wav)|*.wav";
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WinSound
{
public partial class Form1 : Form
{
private TextBox textBox1;
private Button button1;
public Form1() // Constructor.
{
InitializeComponent();
}
[DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true, CharSet = CharSet.Unicode, ThrowOnUnmappableChar = true)]
private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags);
[System.Flags]
public enum PlaySoundFlags : int
{
SND_SYNC = 0x0000,
SND_ASYNC = 0x0001,
SND_NODEFAULT = 0x0002,
SND_LOOP = 0x0008,
SND_NOSTOP = 0x0010,
SND_NOWAIT = 0x00002000,
SND_FILENAME = 0x00020000,
SND_RESOURCE = 0x00040004
}
private void button1_Click(object sender, System.EventArgs e)
{
var dialog1 = new OpenFileDialog();
dialog1.Title = "Browse to find sound file to play";
dialog1.InitialDirectory = @"c:\";
dialog1.Filter = "Wav Files (*.wav)|*.wav";
dialog1.FilterIndex = 2;
dialog1.RestoreDirectory = true;
if (dialog1.ShowDialog() == DialogResult.OK)
{
textBox1.Text = dialog1.FileName;
PlaySound(dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC);
}
}
private void Form1_Load(object sender, EventArgs e)
{
// Including this empty method in the sample because in the IDE,
// when users click on the form, generates code that looks for a default method
// with this name. We add it here to prevent confusion for those using the samples.
}
}
}
编译代码
在 Visual Studio 中创建一个新的 C# Windows Forms 应用程序项目,并将其命名为“WinSound”。
复制上面的代码,将其粘贴到 Form1.cs 文件的内容中。
复制以下代码,然后将其粘贴到 方法中 Form1.Designer.cs 文件的任何现有代码之后。
this.button1 = new System.Windows.Forms.Button(); this.textBox1 = new System.Windows.Forms.TextBox(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(192, 40); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(88, 24); this.button1.TabIndex = 0; this.button1.Text = "Browse"; this.button1.Click += new System.EventHandler(this.button1_Click); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(8, 40); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(168, 20); this.textBox1.TabIndex = 1; this.textBox1.Text = "FIle path"; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(5, 13); this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.textBox1); this.Controls.Add(this.button1); this.Name = "Form1"; this.Text = "Platform Invoke WinSound C#"; this.ResumeLayout(false); this.PerformLayout();
编译并运行该代码。