c# - 使用点击动画以编程方式推进 Powerpoint 幻灯片放映

Question

我想做的是从我的 WPF 应用程序控制 Powerpoint 演示文稿。使用此问题的代码: C# - way to programmatically advance Powerpoint slide show?它适用于普通幻灯片。

但是当我看到一张带有鼠标点击触发的动画的幻灯片时，它并没有像我期望的那样工作。当转到这样的幻灯片时，它会按预期显示，但是当我调用 objPres.SlideShowWindow.View.Next() 时，它什么也不做，在第二次或第三次点击后，它直接进入下一张幻灯片，没有动画.

奇怪的是:当我通过计时器调用 objPres.SlideShowWindow.View.Next() 时，它起作用了!动画按预期运行。

这是我的代码:

Microsoft.Office.Interop.PowerPoint.Application oPPT;
Microsoft.Office.Interop.PowerPoint.Presentations objPresSet;
Microsoft.Office.Interop.PowerPoint.Presentation objPres;
Microsoft.Office.Interop.PowerPoint.SlideShowView oSlideShowView;
Timer slidetest;

private void OpenPPT(object sender, RoutedEventArgs e)
{
    //Create an instance of PowerPoint.
    oPPT = new Microsoft.Office.Interop.PowerPoint.Application();
    // Show PowerPoint to the user.
    oPPT.Visible = Microsoft.Office.Core.MsoTriState.msoTrue;
    objPresSet = oPPT.Presentations;


    OpenFileDialog Opendlg = new OpenFileDialog();

    Opendlg.Filter = "Powerpoint|*.ppt;*.pptx|All files|*.*";

    // Open file when user  click "Open" button  
    if (Opendlg.ShowDialog() == true)
    {
        string pptFilePath = Opendlg.FileName;
        //open the presentation
        objPres = objPresSet.Open(pptFilePath, MsoTriState.msoFalse,
        MsoTriState.msoTrue, MsoTriState.msoTrue);

        objPres.SlideShowSettings.ShowPresenterView = MsoTriState.msoFalse;
        System.Diagnostics.Debug.WriteLine(objPres.SlideShowSettings.ShowWithAnimation);
        objPres.SlideShowSettings.Run();

        oSlideShowView = objPres.SlideShowWindow.View;


        slidetest = new Timer(4000);
        slidetest.AutoReset = false;
        slidetest.Elapsed += new ElapsedEventHandler(slidetest_Elapsed);
        slidetest.Start();

    }
}

void slidetest_Elapsed(object sender, ElapsedEventArgs e)
{
    // this works as expected
    oSlideShowView.Next();
}

private void OnNextClicked(object sender, RoutedEventArgs e)
{
    // this doesn't work, animations aren't shown at all.
    oSlideShowView.Next();
}

我确信这很容易，但我忽略了一些事情。但是我已经为此苦苦思索了很长一段时间:(

Answer 1

我在 MSDN 论坛上找到了问题的解决方案:使用按钮时，由于PPT没有焦点，动画无法正常播放。当我在调用 oSlideShowView.Next() 之前激活 SlideShowWindows 时，它起作用了:

private void OnNextClicked(object sender, RoutedEventArgs e)
{
    oSlideShowView.Application.SlideShowWindows[1].Activate();
    oSlideShowView.Next();
}