using System.Runtime.InteropServices;
using System.Text;
using System.IO ;
namespace clsMCIPlay
{
/// <summary>
/// clsMci 的摘要说明。
/// </summary>
public class clsMCI
{
public clsMCI()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
//定义API函数使用的字符串变量
[MarshalAs(UnmanagedType.ByValTStr,SizeConst=260)]
private string Name = "" ;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst=128)]
private string durLength = "" ;
[MarshalAs(UnmanagedType.LPTStr,SizeConst=128)]
private string TemStr ="";
int ilong;
//定义播放状态枚举变量
public enum State
{
mPlaying = 1,
mPuase = 2,
mStop = 3
};
//结构变量
public struct structMCI
{
public bool bMut;
public int iDur;
public int iPos;
public int iVol;
public int iBal;
public string iName;
public State state;
};
public structMCI mc =new structMCI() ;
//取得播放文件属性
public string FileName
{
get
{
return mc.iName;
}
set
{
//ASCIIEncoding asc = new ASCIIEncoding();
try
{
TemStr ="";
TemStr = TemStr.PadLeft(127,Convert.ToChar(" "));
Name = Name.PadLeft(260,Convert.ToChar(" ")) ;
mc.iName = value;
ilong = APIClass.GetShortPathName(mc.iName,Name, Name.Length);
Name = GetCurrPath(Name);
//Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
ilong = APIClass.mciSendString("close all", TemStr, TemStr.Length , 0);
ilong = APIClass.mciSendString( Name, TemStr, TemStr.Length, 0);
ilong = APIClass.mciSendString("set media time format milliseconds", TemStr, TemStr.Length , 0);
mc.state = State.mStop;
}
catch
{
MessageBox.Show("出错错误!");
}
}
}
//播放
public void play()
{
TemStr = "";
TemStr = TemStr.PadLeft(127,Convert.ToChar(" "));
APIClass.mciSendString("play media", TemStr, TemStr.Length , 0);
mc.state = State.mPlaying ;
}
//停止
public void StopT()
{
TemStr = "";
TemStr = TemStr.PadLeft(128,Convert.ToChar(" "));
ilong = APIClass.mciSendString("close media", TemStr, 128, 0);
ilong = APIClass.mciSendString("close all", TemStr, 128, 0);
mc.state = State.mStop ;
}
public void Puase()
{
TemStr = "";
TemStr = TemStr.PadLeft(128,Convert.ToChar(" "));
ilong = APIClass.mciSendString("pause media", TemStr, TemStr.Length, 0);
mc.state = State.mPuase ;
}
private string GetCurrPath(string name)
{
if(name.Length <1) return "";
name = name.Trim();
name = name.Substring(0,name.Length-1);
return name;
}
//总时间
public int Duration
{
get
{
durLength = "";
durLength = durLength.PadLeft(128,Convert.ToChar(" ")) ;
APIClass.mciSendString("status media length", durLength, durLength.Length, 0);
durLength = durLength.Trim();
if(durLength == "") return 0;
return (int)(Convert.ToDouble(durLength) / 1000f);
}
}
//当前时间
public int CurrentPosition
{
get
{
durLength = "";
durLength = durLength.PadLeft(128,Convert.ToChar(" ")) ;
APIClass.mciSendString("status media position", durLength, durLength.Length, 0);
mc.iPos = (int)(Convert.ToDouble(durLength) / 1000f);
return mc.iPos;
}
}
}
public class APIClass
{
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern int GetShortPathName (
string lpszLongPath,
string shortFile,
int cchBuffer
);
[DllImport("winmm.dll", EntryPoint="mciSendString", CharSet = CharSet.Auto)]
public static extern int mciSendString (
string lpstrCommand,
string lpstrReturnString,
int uReturnLength,
int hwndCallback
);
}
}
二、用于测试媒体播放类的简单代码：
| using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Runtime.InteropServices; using System.Text; using System.IO ; using clsMCIPlay; namespace MCIPlay { /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form { private System.ComponentModel.IContainer components; private System.Windows.Forms.Timer timer1; private System.Windows.Forms.Button Play; private System.Windows.Forms.Button Stop; private System.Windows.Forms.Button Puase; private System.Windows.Forms.Label PlayFileName; private System.Windows.Forms.Label Duration; private System.Windows.Forms.Label CurrentPosition; private System.Windows.Forms.OpenFileDialog openFileDialog1; private System.Windows.Forms.Button BrowserFile; clsMCI mp = new clsMCI(); public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent(); // // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.Play = new System.Windows.Forms.Button(); this.PlayFileName = new System.Windows.Forms.Label(); this.Duration = new System.Windows.Forms.Label(); this.Stop = new System.Windows.Forms.Button(); this.Puase = new System.Windows.Forms.Button(); this.CurrentPosition = new System.Windows.Forms.Label(); this.timer1 = new System.Windows.Forms.Timer(this.components); this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); this.BrowserFile = new System.Windows.Forms.Button(); this.SuspendLayout(); // // Play // this.Play.Location = new System.Drawing.Point(102, 243); this.Play.Name = "Play"; this.Play.Size = new System.Drawing.Size(78, 24); this.Play.TabIndex = 0; this.Play.Text = "Play"; this.Play.Click += new System.EventHandler(this.Play_Click); // // PlayFileName // this.PlayFileName.AutoSize = true; this.PlayFileName.Location = new System.Drawing.Point(12, 15); this.PlayFileName.Name = "PlayFileName"; this.PlayFileName.Size = new System.Drawing.Size(0, 17); this.PlayFileName.TabIndex = 1; // // Duration // this.Duration.AutoSize = true; this.Duration.Location = new System.Drawing.Point(15, 51); this.Duration.Name = "Duration"; this.Duration.Size = new System.Drawing.Size(0, 17); this.Duration.TabIndex = 2; // // Stop // this.Stop.Location = new System.Drawing.Point(282, 243); this.Stop.Name = "Stop"; this.Stop.Size = new System.Drawing.Size(81, 24); this.Stop.TabIndex = 3; this.Stop.Text = "Stop"; this.Stop.Click += new System.EventHandler(this.Stop_Click); // // Puase // this.Puase.Location = new System.Drawing.Point(198, 243); this.Puase.Name = "Puase"; this.Puase.Size = new System.Drawing.Size(72, 24); this.Puase.TabIndex = 4; this.Puase.Text = "Puase"; this.Puase.Click += new System.EventHandler(this.Puase_Click); // // CurrentPosition // this.CurrentPosition.AutoSize = true; this.CurrentPosition.Location = new System.Drawing.Point(15, 87); this.CurrentPosition.Name = "CurrentPosition"; this.CurrentPosition.Size = new System.Drawing.Size(0, 17); this.CurrentPosition.TabIndex = 5; // // timer1 // this.timer1.Enabled = true; this.timer1.Interval = 1000; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // BrowserFile // this.BrowserFile.Location = new System.Drawing.Point(312, 165); this.BrowserFile.Name = "BrowserFile"; this.BrowserFile.Size = new System.Drawing.Size(87, 24); this.BrowserFile.TabIndex = 6; this.BrowserFile.Text = "SelectFile"; this.BrowserFile.Click += new System.EventHandler(this.BrowserFile_Click); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(433, 287); this.Controls.Add(this.BrowserFile); this.Controls.Add(this.CurrentPosition); this.Controls.Add(this.Puase); this.Controls.Add(this.Stop); this.Controls.Add(this.Duration); this.Controls.Add(this.PlayFileName); this.Controls.Add(this.Play); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); } #endregion /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } //选择MP3文件播放 private void Play_Click(object sender, System.EventArgs e) { try { mp.play(); } catch { MessageBox.Show("出错错误!"); } } //暂停播放 private void Puase_Click(object sender, System.EventArgs e) { try { mp.Puase(); } catch { MessageBox.Show("出错错误!"); } } //停止播放 private void Stop_Click(object sender, System.EventArgs e) { try { mp.StopT(); } catch { MessageBox.Show("出错错误!"); } } //每秒显示一次播放进度 private void timer1_Tick(object sender, System.EventArgs e) { CurrentPosition.Text = mp.CurrentPosition.ToString(); } //浏览文件 private void BrowserFile_Click(object sender, System.EventArgs e) { try { openFileDialog1.Filter = "*.mp3|*.mp3"; openFileDialog1.FileName = ""; if(openFileDialog1.ShowDialog() == DialogResult.OK) { mp.FileName = openFileDialog1.FileName ; PlayFileName.Text = openFileDialog1.FileName ; Duration.Text = mp.Duration.ToString() ; } } catch { MessageBox.Show("出错错误!"); } } } } |