用mciSendString做音乐播放器

音乐操作类

  1 public class clsMCI
  2     {
  3         public clsMCI()
  4         {
  5             //
  6             // TODO: 在此处添加构造函数逻辑
  7             //
  8         }
  9 
 10         //定义API函数使用的字符串变量 
 11         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
 12         private string Name = "";
 13         [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
 14         private string durLength = "";
 15         [MarshalAs(UnmanagedType.LPTStr, SizeConst = 128)]
 16         private string TemStr = "";
 17         int ilong;
 18         //定义播放状态枚举变量
 19         public enum State
 20         {
 21             mPlaying = 1,
 22             mPuase = 2,
 23             mStop = 3
 24         };
 25         //结构变量
 26         public struct structMCI
 27         {
 28             public bool bMut;
 29             public int iDur;
 30             public int iPos;
 31             public int iVol;
 32             public int iBal;
 33             public string iName;
 34             public State state;
 35         };
 36 
 37         public structMCI mc = new structMCI();
 38 
 39         //取得播放文件属性
 40         public string FileName
 41         {
 42             get
 43             {
 44                 return mc.iName;
 45             }
 46 
 47             set
 48             {
 49                 //ASCIIEncoding asc = new ASCIIEncoding(); 
 50                 try
 51                 {
 52                     TemStr = "";
 53                     TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
 54                     Name = Name.PadLeft(260, Convert.ToChar(" "));
 55                     mc.iName = value;
 56                     ilong = APIClass.GetShortPathName(mc.iName, Name, Name.Length);
 57                     Name = GetCurrPath(Name);
 58                     //Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
 59                     Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
 60                     ilong = APIClass.mciSendString("close all", TemStr, TemStr.Length, 0);
 61                     ilong = APIClass.mciSendString(Name, TemStr, TemStr.Length, 0);
 62                     ilong = APIClass.mciSendString("set media time format milliseconds", TemStr, TemStr.Length, 0);
 63                     mc.state = State.mStop;
 64                 }
 65                 catch
 66                 {
 67                     MessageBox.Show("出错错误!");
 68                 }
 69             }
 70         }
 71 
 72         //播放
 73         public void play()
 74         {
 75             TemStr = "";
 76             TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
 77             APIClass.mciSendString("play media", TemStr, TemStr.Length, 0);
 78             mc.state = State.mPlaying;
 79         }
 80         //停止
 81         public void StopT()
 82         {
 83             TemStr = "";
 84             TemStr = TemStr.PadLeft(128, Convert.ToChar(" "));
 85             ilong = APIClass.mciSendString("close media", TemStr, 128, 0);
 86             ilong = APIClass.mciSendString("close all", TemStr, 128, 0);
 87             mc.state = State.mStop;
 88 
 89         }
 90 
 91         public void Puase()
 92         {
 93             TemStr = "";
 94             TemStr = TemStr.PadLeft(128, Convert.ToChar(" "));
 95             ilong = APIClass.mciSendString("pause media", TemStr, TemStr.Length, 0);
 96             mc.state = State.mPuase;
 97         }
 98         private string GetCurrPath(string name)
 99         {
100             if (name.Length < 1) return "";
101             name = name.Trim();
102             name = name.Substring(0, name.Length - 1);
103             return name;
104         }
105         //总时间
106         public int Duration
107         {
108             get
109             {
110                 durLength = "";
111                 durLength = durLength.PadLeft(128, Convert.ToChar(" "));
112                 APIClass.mciSendString("status media length", durLength, durLength.Length, 0);
113                 durLength = durLength.Trim();
114                 if (durLength == "") return 0;
115                 return (int)(Convert.ToDouble(durLength) / 1000f);
116             }
117         }
118 
119         //当前时间
120         public int CurrentPosition
121         {
122             get
123             {
124                 durLength = "";
125                 durLength = durLength.PadLeft(128, Convert.ToChar(" "));
126                 APIClass.mciSendString("status media position", durLength, durLength.Length, 0);
127                 durLength = durLength.Trim();
128                 if (durLength == "") return 0;
129                 mc.iPos = (int)(Convert.ToDouble(durLength) / 1000f);
130                 return mc.iPos;
131             }
132             set
133             {
134                 string Command = String.Format("Seek Media to {0}", value * 1000);
135                 APIClass.mciSendString(Command, null, 0, 0);//使播放停止  
136                 mc.state = State.mStop;
137                 mc.iPos = value * 1000;
138                 play(); 
139             }
140         }
141 
142 
143 
144     }
145 
146     public class APIClass
147     {
148 
149         [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
150         public static extern int GetShortPathName(
151         string lpszLongPath,
152         string shortFile,
153         int cchBuffer
154         );
155 
156         [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
157         public static extern int mciSendString(
158         string lpstrCommand,
159         string lpstrReturnString,
160         int uReturnLength,
161         int hwndCallback
162         );
163 
164     }

clsMCI