C # to create a simple local music player (a) - basic functions

Inspired by this post chiefs, similar to the first part of the original post: View original post , some only slightly supplement not mentioned, after all, knowledge shortsighted.

Page design section

The same as the original paste, adding a label only long duration and total song playback to show the current playback section. Add windows comes windowsMediaPlayer control method: Right Toolbox - click options - click the COM component - to find and check the windowsMediaPlayer-- determine onto the form.
Note: windowsMediaPlayer own control interface controls can be used directly

Code implementation part

1. Add a song

First, we declare a few variables. max represents the total length of the song time, min represents the position of the currently playing song, bal expressed as a percentage of the length when the song is playing.

        double max, min, bal;                  //为播放进度条提前声明变量

Add Songs button code:

        private void button_Addmusic_Click(object sender, EventArgs e)
        {
            OpenFileDialog open = new OpenFileDialog();       //实例化一个通用对话框
            open.Filter = "音频文件(*.mp3)|*.mp3";            //选择文件格式
            if (open.ShowDialog() == DialogResult.OK)
            {
                //还原最大值最小值及进度条位置
                max = 0.0;
                min = 0.0;
                bal = 0.0;
                trackBar_progress.Value = 0;
                myMediaPlayer.URL = open.FileName;            //添加到播放器组件
                listBox_music.Items.Add(open.FileName);       //将音频文件路径添加到列表框内
                listBox_music.SelectedIndex = listBox_music.Items.Count - 1;    //列表框选中项为添加的歌曲路径
                timer_progress.Enabled = true;                //开始检测进度
            }
        }

2. playback progress

windowsMediaPlayer control comes with a progress bar, but here we use trackBar control from a system, because the progress bar change depending time, so add a timer control, named timer_progress, which Interval property to 1000, an event that is triggered once per second. Where the tick to register an event, as follows:

        private void timer_progress_Tick(object sender, EventArgs e)
        {
            try
            {
                max = myMediaPlayer.currentMedia.duration;      //获取文件的时间长度
                min = myMediaPlayer.Ctlcontrols.currentPosition;//获取文件的当前播放位置
                bal = min / max;                                //计算百分比
                trackBar_progress.Value = (int)(bal * 100);     //设置滑块位置
                //将时长转化为XX：XX并显示在相应label上
                int intmax = (int)max;
                int intmin = (int)min;
                int intminM = intmin / 60;
                int intminS = intmin % 60;
                int intmaxM = intmax / 60;                      
                int intmaxS = intmax % 60;
                label_time.Text = intminM.ToString() + ":" + intminS.ToString() + "/" + intmaxM.ToString() + ":" + intmaxS.ToString();
                //截取路径的文件名部分显示在“当前歌曲”的label上
                string nowsong = listBox_music.SelectedItem.ToString();
                label_nowsong.Text = nowsong.Substring(nowsong.LastIndexOf("\\") + 1);
            }
            catch (Exception)
            {
                //切换歌曲瞬间可能导致max,min无值，添加try跳转报错但并不对报错进行处理
            }
        }

3. Drag Play

To realize drag that is due to play "press pause", "release continued," two events. When the progress bar is pressed, playback pauses. After sliding to a specified location, release the button progress bar, playback continues from the current release position.
The "Press Pause" that trackBar the MouseDown event code is as follows:

        private void trackBar_progress_MouseDown(object sender, MouseEventArgs e)
        {
            timer_progress.Enabled = false;     //停止检测播放进度
            myMediaPlayer.Ctlcontrols.pause();  //暂停当前播放文件
        }

The "release continued," that is trackBar the MouseUp event code is as follows:

        private void trackBar_progress_MouseUp(object sender, MouseEventArgs e)
        {
            double newValue = trackBar_progress.Value * 0.1 * 0.1 * max;
            myMediaPlayer.Ctlcontrols.currentPosition = newValue;          //为播放控件赋予新进度
            myMediaPlayer.Ctlcontrols.play();                              //从当前进度开始播放
            timer_progress.Enabled = true;                                 //开始检测播放进度
        }

4. start playing

Click the "Start button" that play, as follows:

        private void button_Start_Click(object sender, EventArgs e)
        {
            myMediaPlayer.Ctlcontrols.play();         //开始播放
        }

Of course, you can play songs by specifying a path, double-click the song list, the code is as follows:

        private void listBox_music_DoubleClick(object sender, EventArgs e)
        {
            //若点击的歌曲列表有效，为播放控件赋予新路径
            if (listBox_music.SelectedIndex != -1)
            {
                myMediaPlayer.URL = listBox_music.SelectedItem.ToString();
            }
        }

5. Pause Play

Click the "pause button" that is playing to pause, as follows:

        private void button_Stop_Click(object sender, EventArgs e)
        {
            myMediaPlayer.Ctlcontrols.pause();        //暂停播放
        }

6. Stop Play

Click the "stop button" stop playing the current code is as follows:

        private void button_End_Click(object sender, EventArgs e)
        {
            myMediaPlayer.Ctlcontrols.stop();         //停止播放
        }

Of course, just close the program can stop playing.

Postscript part

Select a song, show schedule, start, pause, stop playing at this time of simple music player has been basically run.On follow-up lyrics display, you can look at the second part of the C # synchronous lyrics displayWhen the next original post As mentioned in the list of songs loaded to open, next time, after all, knowledge shallow, and forgive us.