C # calls mciSendString to play audio files

The mciSendString function is a WINAPI that is used primarily to send string commands to the MCI (Media Control Interface) device.

The declaration of a function is as follows:

        Private Static extern Long mcisendstring (            string command ,      //MCI command string             // Buffer for storing feedback information            int returnsize,      // length of buffer            IntPtr hwndcallback  //  The handle of the callback window, usually null            );  

Second, the complete code is as follows, the details of which are annotated, pay special attention to the processing of the thread when playing:

usingSystem;usingSystem.Runtime.InteropServices;usingSystem.Threading;namespacezhy.mci{/** Call API function mciSendString Play audio file * Mainly includes play by a specified number of times and loop play * Zhy * Time: 2015-7-21*/     Public classMCI {[DllImport ("Winmm.dll")]        Private Static extern LongmciSendString (stringCommand//MCI command String            stringReturnstring,//buffer for storing feedback information            intReturnsize,//the length of the bufferIntPtr Hwndcallback//handle to the callback window, typically null);//returns 0 if successful, otherwise the error code is returned.         /// <summary>        ///play by a specified number of times/// </summary>        /// <param name= "file" ></param>        Private voidPlaywait (stringfile) {            /** Open device_name type Device_type alias Device_alias turn on device * Device_name the device name to use, usually the file name             。             * Type Device_type device type, such as MPEGVideo or Waveaudio, can be omitted.             * Alias Device_alias device alias, specified to replace the device name in other commands. */mciSendString (string. Format ("Open {0} type MPEGVideo alias media", file),NULL,0, IntPtr.Zero); /** Play Device_alias from pos1 to Pos2 wait repeat start device play * If omitted from then start playing from the current track.             * If omitted to then play to the end. * If you specify wait, wait until the playback command is returned.             This indicates that wait will cause a thread to block until the playback is complete * If the repeat is indicated, it will be repeated repeatedly.             * If you specify both wait and repeat, the command will not return, and this thread will cause a blockage, which usually causes the program to lose its response. */mciSendString ("Play Media wait",NULL,0, IntPtr.Zero); /** Close Device*/mciSendString ("Close Media",NULL,0, IntPtr.Zero); }        /// <summary>        ///Loop Playback/// </summary>        /// <param name= "file" ></param>        Private voidPlayrepeat (stringfile) {mciSendString (string. Format ("Open {0} type MPEGVideo alias media", file),NULL,0, IntPtr.Zero); mciSendString ("Play Media repeat",NULL,0, IntPtr.Zero); }        Privatethread thread; /// <summary>        ///Play audio files/// </summary>        /// <param name= "file" >Audio file path</param>        /// <param name= "Times" >Play count, 0: Loop play greater than 0: play by a specified number of times</param>         Public voidPlay (stringFileintTimes ) {            //The thread is mainly used to solve the problem of thread blocking when the wait is specified during playback, which causes the interface to suspend animation.Thread =NewThread (() =                {                    if(Times = =0) {playrepeat (file); }                    Else if(Times >0)                    {                         for(inti =0; I < times; i++) {playwait (file);            }                    }                }); //thread must be single-threadedthread.            Setapartmentstate (ApartmentState.STA); Thread. IsBackground=true; Thread.        Start (); }        /// <summary>        ///to end a playing thread/// </summary>         Public voidExit () {if(Thread! =NULL)            {                Try{thread.                Abort (); }                Catch{} thread=NULL; }        }    }}

Third, call:

New MCI (). Play (" audio file path ", number of plays);

C # calls mciSendString to play audio files