淮阴师范学院毕业论文（设计）
private void myListBox_MouseDown(object sender, MouseEventArgs e) {
if (this.myListBox.thisIndex != -1) {
if (e.Button == System.Windows.Forms.MouseButtons.Right) {
this.myListBox.ContextMenuStrip = this.cmsListBox; } } }
图5-2播放列表
5.3 播放控制模块
播放是音乐播放器最重要的功能。本程序使用Windows Media Player命名空间中定义的属性和方法来实现歌曲的播放、暂停、上下去切换等。其核心代码如下： private void initialBtn()
{
if (playStatue == MediaPlayer.PlayStatue.播放)
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淮阴师范学院毕业论文（设计）
{ //正在播放,暂停图片
btnPlay.Image = Image.FromFile(\); }
else if (playStatue == MediaPlayer.PlayStatue.暂停 || playStatue == MediaPlayer.PlayStatue.停止) {//开始播放图片
btnPlay.Image = Image.FromFile(\); }
if (this.boolVolumn) {
this.btnVolumn.Image = Image.FromFile(\); } else
this.btnVolumn.Image = Image.FromFile(\);
}
private void nextSongPlay() {
//下一曲
if (playStyle == MediaPlayer.PlayStyle.随机播放)
{//选择随机播放时就产生一个随机数组,播放记录,根据数组,上一曲下一曲都有用
if (randomIndex + 1 >= randomList.Count) {
randomSongPlay(); } else
this.myListBox.doubleClickIndex = (int)randomList[++randomIndex];
}
else if (playStyle == MediaPlayer.PlayStyle.顺序播放) {
this.myListBox.doubleClickIndex++; if (this.myListBox.doubleClickIndex >= this.myListBox.Items.Count) {
playStatue = MediaPlayer.PlayStatue.停止; this.myListBox.doubleClickIndex = this.myListBox.Items.Count - 1;
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淮阴师范学院毕业论文（设计）
stop();
initialBtn(); return; } } else
{//下一曲,如果到底,将播放第一首歌曲,全部循环 this.myListBox.doubleClickIndex++; if (this.myListBox.doubleClickIndex >= this.myListBox.Items.Count)
{//转第一首
this.myListBox.doubleClickIndex = 0; } }
btnChangeSong(); initialBtn();
}
private void lastSongPlay() {
if (playStyle == MediaPlayer.PlayStyle.随机播放 && randomIndex >= 1) {
this.myListBox.doubleClickIndex = (int)randomList[--randomIndex]; }
else if (playStyle == MediaPlayer.PlayStyle.顺序播放) {
this.myListBox.doubleClickIndex--;
if (this.myListBox.doubleClickIndex <= -1) {
this.myListBox.doubleClickIndex = 0;
playStatue = MediaPlayer.PlayStatue.停止; stop();
initialBtn(); return; } } else {
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淮阴师范学院毕业论文（设计）
this.myListBox.doubleClickIndex--;
if (this.myListBox.doubleClickIndex <= -1) {//转最后一首
this.myListBox.doubleClickIndex = this.myListBox.Items.Count - 1; } }
btnChangeSong(); }
5.4 音量控制模块
通过调节音量大小来达到歌曲播放的最佳状态。可以调用API函数 SENDMESSAGE APPCOMMAND_VOLUME_MUTE和TrackBar 类来实现音量控制。代码如下： private void btnVolumn_Click(object sender, EventArgs e) {
IniUtility.FilePath = Application.StartupPath + \; if (this.boolVolumn) {
player.setAudioOnOff(\); this.boolVolumn = false;
IniUtility.WriteIniKey(\, \, \); } else {
player.setAudioOnOff(\); this.boolVolumn = true;
IniUtility.WriteIniKey(\, \, \); }
initialBtn(); }
private void myTBVolumn_Scroll(object sender, EventArgs e) {
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