此演示向您展示如何将 PowerPoint 文档 ( ppt/pptx ) 转换为 PDF、HTML、图像、XPS 和 Tiff。

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package ppt;import com.spire.presentation.FileFormat;import com.spire.presentation.Presentation;import javax.imageio.ImageIO;import java.awt.image.BufferedImage;import java.io.File;public class ConvertDemo{public void convertDemo(String filePath,String convertTo,String resultFileName) throws Exception{Presentation presentation = new Presentation();presentation.loadFromFile(filePath);ConvertFormat(presentation,convertTo,resultFileName);}private void ConvertFormat(Presentation presentation,String convertTo,String resultFileName) throws Exception{switch (convertTo){case "PDF":presentation.saveToFile(resultFileName+".pdf",FileFormat.PDF);break;case "HTML":presentation.saveToFile(resultFileName+".html",FileFormat.HTML);break;case "IMAGE":BufferedImage[] images = new BufferedImage[presentation.getSlides().getCount()];for (int i = 0;i<presentation.getSlides().getCount();i++){images[i] = presentation.getSlides().get(i).saveAsImage();}if (images != null &&images.length >0){if (images.length == 1){ImageIO.write(images[0],".PNG",new File(resultFileName+".png"));}}else{for (int j = 0;j <images.length;j++){String fileName = String.format("image-{0}.png",j);ImageIO.write(images[j],".PNG",new File(fileName));}}break;case "XPS":presentation.saveToFile(resultFileName+".xps",FileFormat.XPS);break;case "TIFF":presentation.saveToFile(resultFileName+".tiff",FileFormat.TIFF);break;}}}

using Spire.Presentation;using System;using System.Drawing;using System.Drawing.Imaging;namespace DemoOnlineCode{class Convertors{public void demoConvert(string filePath,string format,string resultFileName){Presentation presentation = new Presentation();presentation.LoadFromFile(filePath);ConvertFormat(presentation,format,resultFileName);}private static void ConvertFormat(Presentation presentation,string format,string resultFileName){switch (format){case "PDF":presentation.SaveToFile(resultFileName + ".PDF",FileFormat.PDF);break;case "HTML":presentation.SaveToFile(resultFileName + ".html",FileFormat.Html);break;case "IMAGE":Image[] images = new Image[presentation.Slides.Count];for (int i = 0;i <presentation.Slides.Count;i++){images[i] = presentation.Slides[i].SaveAsImage();}if (images != null &&images.Length >0){if (images.Length == 1){images[0].Save(resultFileName + ".bmp",System.Drawing.Imaging.ImageFormat.Bmp);}else{for (int i = 0;i <images.Length;i++){string fileName = string.Format("{0}-Image-{1}.png",resultFileName,i);images[i].Save(fileName,ImageFormat.Png);}}}break;case "XPS":presentation.SaveToFile(resultFileName + ".xps",FileFormat.XPS);break;case "TIFF":Image[] images2 = new Image[presentation.Slides.Count];if (images2 != null &&images2.Length >0){for (int i = 0;i <presentation.Slides.Count;i++){images2[i] = presentation.Slides[i].SaveAsImage();}JoinTiffImages(images2,resultFileName+ ".tiff",EncoderValue.CompressionLZW);}break;}}private static ImageCodecInfo GetEncoderInfo(string mimeType){ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();for (int j = 0;j <encoders.Length;j++){if (encoders[j].MimeType == mimeType) return encoders[j];}throw new Exception(mimeType + " mime type not found in ImageCodecInfo");}public static void JoinTiffImages(Image[] images,string outFile,EncoderValue compressEncoder){//Use the save encoder System.Drawing.Imaging.Encoder enc = System.Drawing.Imaging.Encoder.SaveFlag;EncoderParameters ep = new EncoderParameters(2);ep.Param[0] = new EncoderParameter(enc,(long)EncoderValue.MultiFrame);ep.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression,(long)compressEncoder);Image pages = null;int frame = 0;ImageCodecInfo info = GetEncoderInfo("image/tiff");foreach (Image img in images){if (frame == 0){pages = img;//Save the first frame pages.Save(outFile,info,ep);}else{//Save the intermediate frames ep.Param[0] = new EncoderParameter(enc,(long)EncoderValue.FrameDimensionPage);pages.SaveAdd(img,ep);}if (frame == images.Length - 1){//Flush and close ep.Param[0] = new EncoderParameter(enc,(long)EncoderValue.Flush);pages.SaveAdd(ep);}frame++;}}}}