问将幻灯片从Powerpoint导出到HTML5文件

EN

using Powerpoint = Microsoft.Office.Interop.PowerPoint;

PowerPoint.Application app = new Powerpoint.Application();
PowerPoint.Presentation pres = app.presentation.Open(filepath+"filename.ppt", MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoTrue);

//Trying to export presentation as Html
pres.SaveAs(filepath+"filename.html", PowerPoint.PpSaveAsHtml, MsoTriState.msoTrue);

//Trying to export each Slide as image. Unfortunately don't export as html
int i = 0;
foreach (PowerPoint.Slide slide in press.Slide){
    i+=1;
    String oPath = filepath+"filename_"+i+".jpg";
    slide.Export(oPath, "jpg", 1024, 768);
}

pres.Close();
App.Quit();