C#实现操作PPT动画窗格并插入音频文件

//创建PPT应用程序            
    POWERPOINT.Application objApp = new POWERPOINT.Application();
    POWERPOINT.Presentation objPresSet = null;
 
// 不显示弹出警告等，最小化窗口应用
    objApp.DisplayAlerts = POWERPOINT.PpAlertLevel.ppAlertsNone;
    objApp.WindowState = POWERPOINT.PpWindowState.ppWindowMinimized;
    
//打开文件，假设模板文件名为m1.pptx
    objPresSet = objApp.Presentations.Open("m1.pptx", Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse);
 
//创建查找字典
    Dictionary<string, string> Medias = new Dictionary<string, string>();
    Medias.Add("组合6","P5_01.MP3");
    Medias.Add("组合30", "P5_02.MP3");

//遍历所有的幻灯片对象            
for (int i = 1; i <= objPresSet.Slides.Count; i++)
{
    POWERPOINT.Slide slide = objPresSet.Slides[i];   //获取当前幻灯片对象
    if (slide.TimeLine.MainSequence.Count == 0) continue;  //如果该页没有动画效果则短路
    ...
}
//按提供的字典进行查找 
foreach (string[] pros in Medias)
{
    string f_likecaption = pros[0];  //要查找的动画标题
    mediafile = pros[1];             //对应要添加的MP3文件地址
    POWERPOINT.Shape wave=null;      //初始化一个声音变量，在PPT里也是一个Shape对象
    //遍历该页动画效果
    for (int j = 1; j <= slide.TimeLine.MainSequence.Count; j++)
    {
      POWERPOINT.Effect effect = slide.TimeLine.MainSequence[j];
       //如果查找到动画标题，则添加对应的声音文件
      if (((effect.Shape.Name + ":" + effect.DisplayName).IndexOf(f_likecaption.Trim()) != -1
      {
         wave = slide.Shapes.AddMediaObject2(mediafile);  //添加声音文件方法
         int  singleWaveLen = wave.MediaFormat.Length;    //记录声音的长度
         wave.Left = 60;                                  //shape对象的位置
         wave.AnimationSettings.Animate = Microsoft.Office.Core.MsoTriState.msoTrue; //设置该对象要成为动画
         wave.AnimationSettings.PlaySettings.PlayOnEntry = Microsoft.Office.Core.MsoTriState.msoTrue; //设置为允许自动播放
         wave.AnimationSettings.PlaySettings.HideWhileNotPlaying = Microsoft.Office.Core.MsoTriState.msoTrue; //设置播放期间是隐藏状态
         wave.AnimationSettings.AdvanceMode = POWERPOINT.PpAdvanceMode.ppAdvanceOnTime;//设置与上一动画同时
         wave.AnimationSettings.AnimationOrder = slide.TimeLine.MainSequence.Count;
//shape对象的索引位置，默认为最后一个，这个要根据业务逻辑进行调整 
         break;
      }
     }//for
    ..............
}//foreach pros
//其它关键属性 
POWERPOINT.Effect effect ;
effect.Timing.Duration  //返回或设置以秒为单位的动画长度
float WaveLen = float.Parse((singleWaveLen / 1000.0).ToString()); //声音长度需要换算成秒