Aspose有Aspose.Slides.dll,可以无需安装office,进行读写PPT文件。
Aspose可能通过Aspose.Slides.NET安装
简单的导出图片demo,如下:
1 internal class PptToImagesConverter 2 { 3 private const string ImageExtension = ".png"; 4 public bool ConvertToImages(string pptFile, string exportImagesFolder) 5 { 6 using (Presentation pres = new Presentation(pptFile)) 7 { 8 int desiredX = 1200; 9 int desiredY = 800;10 11 float scaleX = (float)(1.0 / pres.SlideSize.Size.Width) * desiredX;12 float scaleY = (float)(1.0 / pres.SlideSize.Size.Height) * desiredY;13 14 foreach (ISlide sld in pres.Slides)15 {16 Bitmap bmp = sld.GetThumbnail(scaleX, scaleY);17 18 string slidePath = Path.Combine(exportImagesFolder,$"Slide_{sld.SlideNumber}.{ImageExtension}");19 bmp.Save(slidePath, System.Drawing.Imaging.ImageFormat.Png);20 }21 }22 23 return true;24 }25 }
注:以上途径是没有购买过的dll,生成的图片会有水印。使用正版购买的,应该不会有问题。
也是在Nuget中搜索并安装:
另,通过Presentations.Open("c:\test.pptx::PASSWORD::")可以解密PPT,从而导出图片。
1 internal class PptToImagesConverter1 2 { 3 private const string PASSWORD_MARK = "::PASSWORD::"; 4 private const string ImageExtension = ".png"; 5 public bool ConvertToImages(string pptFile, string exportImagesFolder) 6 { 7 var tempPpt = Path.Combine(Path.GetTempPath(), Guid.NewGuid() + Path.GetExtension(pptFile)); 8 File.Copy(pptFile, tempPpt); 9 Microsoft.Office.Interop.PowerPoint.Application app = new Microsoft.Office.Interop.PowerPoint.Application();10 Microsoft.Office.Interop.PowerPoint.Presentation presentation = app.Presentations.Open(tempPpt + PASSWORD_MARK, MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoFalse);11 int desiredX = 1200;12 int desiredY = 800;13 var slides = ((Microsoft.Office.Interop.PowerPoint.Presentation)presentation).Slides.Cast<Microsoft.Office.Interop.PowerPoint.Slide>().ToList();14 Parallel.ForEach(slides, slide =>15 {16 string slidePath = Path.Combine(exportImagesFolder, "Slide-" + slide.SlideIndex + ImageExtension);17 slide.Export(slidePath, ImageExtension, desiredX, desiredY);18 });19 return true;20 }21 }
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