c#中用Win32API实现的媒体播放类,支持mp3/wma/wmv

这个是从别人的blog是看到的.

经过我的验证,完全可以使用,而且不仅支持mp3,还支持wma,wmv.播放wmv的话会自动弹出一个视频播放小窗口.

代码:

 

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Text;
using  System.Runtime.InteropServices; 
using  System.IO ;
using  System.Windows.Forms;

namespace  winformFlash
... {
    /**//// <summary>
    /// 用Win32Api实现的媒体播放类.支持Mp3,wma,wmv
    /// </summary>
    class Mp3
    ...{
        public Mp3()
        ...{
        }
        //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
　　);
　}

代码下载: Mp3ForCSharp.zip

 代码来源:http://myliulongtao.icode.youkuaiyun.com/post/2007/06/13/54135