说明（2017-6-19 00:02:18）：
视频转PPT，与github有点冲突，先把代码存起来：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.IO; using System.Windows.Threading; namespace _10视频转换 { /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { //先定义一个字典，存储图片名字和时间 private Dictionary<int, string> imageAndTime = new Dictionary<int, string>(); //定义一个泛型存放时间，用于拖动进度条时前后比较 List<int> imageTimes = new List<int>(); //private string imagePath = @"E:AppServwwwgithubMyWork runkVideoToAudioVideoToAudioinDebug"; private string imagePath = @"F:MyWorkMyWork runkVideoToAudioVideoToAudioinDebugimg"; //音乐总时间 private double totalTime; public MainWindow() { InitializeComponent(); } /// <summary> /// 主窗体加载啦 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void Window_Loaded(object sender, RoutedEventArgs e) { //获取目录下所有图片名字列表并计算时间，存入字典 GetImages(); //显示图片 //存储所有时间 foreach (var item in imageAndTime) { imageTimes.Add(item.Key); } //测试时间存进来没有 //foreach (var item in imageTimes) //{ // Console.WriteLine(item); //} //string imageName = null; //string imagePath = @"E:AppServwwwgithubMyWork runkVideoToAudioVideoToAudioinDebug" + imageName; //image1.Source = new BitmapImage(new Uri(@"E:AppServwwwgithubMyWork runkVideoToAudioVideoToAudioinDebug1.jpg", UriKind.RelativeOrAbsolute)); image1.Source = new BitmapImage(new Uri(imagePath + imageAndTime.Values.First(), UriKind.RelativeOrAbsolute)); //大爷的！直接窗体加载就能自动播放！ myMusic.Play(); } /// <summary> /// 定义计时器，WPF居然没有timer这个控件！ /// </summary> DispatcherTimer timer = new DispatcherTimer(); /// <summary> /// 悲剧的手写timer事件！ /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void timer_tick(object sender, EventArgs e) { //游标跟随播放时间移动 //totalTime = myMusic.NaturalDuration.TimeSpan.TotalSeconds; if (myMusic.Position.TotalSeconds == totalTime) { myMusic.Stop(); //播放完，游标还没跳到开始，按钮就变成“播放”了，阻断进程也不行。 //System.Threading.Thread.Sleep(2000); btnPlayOrPause.Content = "播放"; } else { //进度条位置等于音乐播放到的位置 slider1.Value = myMusic.Position.TotalSeconds; //显示进度时间，后期要进行计算，符合时间格式 lbTime.Content = "00:" + Math.Floor(myMusic.Position.TotalSeconds); } //图片跟随播放时间变换 int bingoTime = (int)Math.Floor(slider1.Value); if (imageAndTime.ContainsKey(bingoTime)) { image1.Source = new BitmapImage(new Uri(imagePath + imageAndTime[bingoTime], UriKind.RelativeOrAbsolute)); } //foreach (var item in imageAndTime) //{ //if (item.Key == Math.Floor(slider1.Value)) // { // image1.Source = new BitmapImage(new Uri(imagePath + item.Value, UriKind.RelativeOrAbsolute)); // } //} } /// <summary> /// 播放器加载啦 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void myMusic_MediaOpened(object sender, RoutedEventArgs e) { //myMusic.Source = new Uri(@"F:MyWorkMyWork runkVideoToAudioVideoToAudioinDebugLoveStory.mp3", UriKind.RelativeOrAbsolute); //获取歌曲总时长 totalTime = myMusic.NaturalDuration.TimeSpan.TotalSeconds; slider1.Maximum = totalTime; //下面3行是抄的，大意为：设置计时器时间间隔为1秒，把上面的timer_tick方法添加进timer.Tick事件，计时器启动 timer.Interval = TimeSpan.FromSeconds(1); timer.Tick += new EventHandler(timer_tick); timer.Start(); Console.WriteLine(totalTime); } /// <summary> /// 获取文件夹里所有图片名，暂时使用字符串截取，后期加上正则识别。 /// 换了一个方法，直接获得文件名。 /// 使用字典存储图片名和时间，返回这个字典。 /// </summary> private void GetImages() { //string imagePath = @"E:MyWorkMy10视频转换inDebug"; //string[] files = Directory.GetFiles(imagePath, "*.jpg"); //List<string> imageNames = new List<string>(); //foreach (var file in files) //{ // imageNames.Add(file.Substring(file.Length-10,10)); //} //foreach (var imageName in imageNames) //{ // Console.WriteLine(imageName); //} //下面的方法可以直接获取文件名，不用正则或字符串处理。 DirectoryInfo folder = new DirectoryInfo(imagePath); FileInfo[] imageNames = folder.GetFiles("*.jpg"); //获取秒数，存入imageTimes集合。后来发现不好，采用了字典。 //List<int> imageTimes = new List<int>(); //foreach (FileInfo file in imageNames) //{ // if (file.Name.Length == 10) // { // int min = Convert.ToInt32(file.Name.Substring(0, 2)); // int sec = Convert.ToInt32(file.Name.Substring(2, 2)); // imageTimes.Add(min * 60 + sec); // } //} //测试，输出每个图片文件名的秒数 //foreach (var imageTime in imageTimes) //{ // Console.WriteLine(imageTime); //} //需要把图片名和对应时间作为键值对存入json，例如{"001580.jpg":15, "010425":64} //算了用字典吧！ //Dictionary<string, int> imageAndTime = new Dictionary<string, int>(); foreach (var imageName in imageNames) { //筛选一下，10个字符的才是图片名字的正确格式 if (imageName.Name.Length == 10) { int min = Convert.ToInt32(imageName.Name.Substring(0, 2)); int sec = Convert.ToInt32(imageName.Name.Substring(2, 2)); int imageTime = min * 60 + sec; imageAndTime.Add(imageTime, imageName.Name); } } //return imageAndTime; //输出字典测试一下 //foreach (var item in imageAndTime) //{ // Console.WriteLine(item.Key); // Console.WriteLine(item.Value); //} } /// <summary> /// 拖动进度条，改变播放时间，保留一句代码，拖动时有用。 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void slider1_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { myMusic.Position = TimeSpan.FromSeconds(slider1.Value); ////拖动进度条的时候，判断该显示哪张图片，两个时间之间{"001580.jpg":15,"001974.jpg":19} //foreach (var item in imageAndTime) //{ // if (item.Value == Math.Floor(slider1.Value)) // { // image1.Source = new BitmapImage(new Uri(imagePath + item.Key, UriKind.RelativeOrAbsolute)); // } // //此处有问题，提示索引不能为负或超出索引。slider_valuechange事件，是不是自己动也算？不仅仅是拖动？ // //else // //{ // // for (int i = 0; i < imageTimes.Count; i++) // // { // // if (Math.Floor(slider1.Value) < imageTimes[i]) // // { // // MessageBox.Show(imageTimes[i - 1].ToString()); // // } // // } // //} //} //slider1.Value = myMusic.Position.TotalSeconds; //myMusic.Position = slider1.Value; //slider1.AddHandler(); } /// <summary> /// 鼠标在slider上按下，处理播放进度的正确方法。 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void slider1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { Point p = Mouse.GetPosition(slider1); int pX = Convert.ToInt32(p.X); //MessageBox.Show(pX.ToString()); slider1.Value = pX / slider1.Width * slider1.Maximum; myMusic.Position = TimeSpan.FromSeconds(slider1.Value); //拖动进度条的时候，判断该显示哪张图片，两个时间之间{"001580.jpg":15,"001974.jpg":19} //Dictionary<string, int> imageAndTime的格式为{"001580.jpg":"15", "001974.jpg":"19"} //不需要在点击的时候判断是否正好等于图片的时间，在timer里已经判断了。 //if (item.Value == Math.Floor(slider1.Value)) //{ // image1.Source = new BitmapImage(new Uri(imagePath + item.Key, UriKind.RelativeOrAbsolute)); //} //只需要判断范围 for (int i = 1; i < imageTimes.Count; i++) { //i要从1开始，不然i-1会超出索引 if ((Math.Floor(slider1.Value) < imageTimes[i]) && (Math.Floor(slider1.Value) > imageTimes[i - 1])) { image1.Source = new BitmapImage(new Uri(imagePath + imageAndTime[imageTimes[i - 1]], UriKind.RelativeOrAbsolute)); //foreach (var item in imageAndTime) //{ // if (item.Value == imageTimes[i - 1]) // { // image1.Source = new BitmapImage(new Uri(imagePath + item.Key, UriKind.RelativeOrAbsolute)); // } //} } else if (Math.Floor(slider1.Value) < imageTimes[0]) { image1.Source = new BitmapImage(new Uri(imagePath + imageAndTime.Values.First(), UriKind.RelativeOrAbsolute)); } } } /// <summary> /// 播放和暂停按钮 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnPlayOrPause_Click(object sender, RoutedEventArgs e) { //要将loadedBehavior和unloadedBehavior设为manual手动 //如果设为开始就自动播放，播放和暂停按钮就不管用了。已解决！ if (btnPlayOrPause.Content.ToString() == "播放") { myMusic.Play(); btnPlayOrPause.Content = "暂停"; } else { myMusic.Pause(); btnPlayOrPause.Content = "播放"; } } /// <summary> /// 音量条 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void slider2_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { //貌似音量最高也就10了 myMusic.Volume = slider2.Value; } } }
XAML：
<Window x:Class="_10视频转换.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded"> <Grid Height="285" Name="grid1" Width="503"> <!--<Image Height="86" HorizontalAlignment="Left" Margin="68,168,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="377" Source="bindebug1.jpg"/>--> <Image Height="107" HorizontalAlignment="Left" Margin="12,10,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="474" /> <MediaElement Height="48" HorizontalAlignment="Left" Margin="40,123,0,0" Name="myMusic" VerticalAlignment="Top" Width="271" MediaOpened="myMusic_MediaOpened" UnloadedBehavior="Manual" DataContext="{Binding}" LoadedBehavior="Manual" Source="F:MyWorkMyWork runkVideoToAudioVideoToAudioinDebugLoveStory.mp3" /> <Button Content="暂停" Height="31" HorizontalAlignment="Left" Margin="40,231,0,0" Name="btnPlayOrPause" VerticalAlignment="Top" Width="49" Click="btnPlayOrPause_Click" /> <Slider Height="25" HorizontalAlignment="Left" Margin="40,186,0,0" Name="slider1" VerticalAlignment="Top" Width="365" ValueChanged="slider1_ValueChanged" PreviewMouseLeftButtonDown="slider1_PreviewMouseLeftButtonDown" /> <Label Height="24" HorizontalAlignment="Left" Margin="421,188,0,0" Name="lbTime" VerticalAlignment="Top" Width="65" Content="00:00" /> <Slider Height="23" HorizontalAlignment="Left" Margin="340,238,0,0" Name="slider2" VerticalAlignment="Top" Width="100" ValueChanged="slider2_ValueChanged" Value="5" Maximum="20" /> </Grid> </Window>