Knowledgebase (2311)
Children categories
In Microsoft PowerPoint, a comment is a note that you can attach to a phrase or paragraph on a slide. Viewing comments added by the author, readers can learn more information about the content. Likewise, readers can also add comments to provide reviews or feedbacks to the author. In this article, you will learn how to programmatically add or remove comments in a PowerPoint slide using Spire.Presentation for .NET.
Install Spire.Presentation for .NET
To begin with, you need to add the DLL files included in the Spire.Presentation for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.Presentation
Add Comments to a Presentation Slide
The detailed steps are as follows:
- Create a Presentation instance.
- Load a PowerPoint document using Presentation.LoadFromFile() method.
- Get CommentAuthor List using Presentation.CommentAuthors property.
- Add the author of the comment using CommentAuthorList.AddAuthor() method.
- Get a specified slide using Presentation.Slides[] property, and then add a comment to the slide using ISlide.AddComment(ICommentAuthor, String, PointF, DateTime) method.
- Save the result document using Presentation.SaveToFile() method.
- C#
- VB.NET
using Spire.Presentation;
using System;
namespace AddComment
{
class Program
{
static void Main(string[] args)
{
//Create a Presentation instance
Presentation presentation = new Presentation();
//Load a PowerPoint document
presentation.LoadFromFile(@"D:\Files\Test.pptx");
//Add the author of the comment
ICommentAuthor author = presentation.CommentAuthors.AddAuthor("E-iceblue", "comment:");
//Add a comment to the specified slide
presentation.Slides[0].AddComment(author, "Summary of Spire.Presentation functions", new System.Drawing.PointF(25, 22), DateTime.Now);
//Save the document
presentation.SaveToFile("comment.pptx", FileFormat.Pptx2010);
}
}
}
Remove Comments from a Presentation Slide
The detailed steps are as follows:
- Create a Presentation instance.
- Load a PowerPoint document using Presentation.LoadFromFile() method.
- Get a specified slide using Presentation.Slides[] property.
- Remove comment from the specified slide using ISlide.DeleteComment(Comment) method.
- Save the result document using Presentation.SaveToFile() method.
- C#
- VB.NET
using Spire.Presentation;
namespace RemoveComment
{
class Program
{
static void Main(string[] args)
{
//Create a Presentation instance
Presentation presentation = new Presentation();
//Load a PowerPoint document
presentation.LoadFromFile("comment.pptx");
//Get the first slide
ISlide slide = presentation.Slides[0];
//Remove comment from the specified slide
slide.DeleteComment(slide.Comments[0]);
//Save the document
presentation.SaveToFile("RemoveComment.pptx", FileFormat.Pptx2010);
}
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
Spire.PDF has a function of adding, removing the blank pages in C#. We have already shown you how to remove the blank page in a PDF file. This article will show you how to insert an empty page in a PDF file in C#. By using the Spire.PDF, we can add the blank page to any place in the PDF file you want, such as at the first, the middle of the PDF file or at the end of the PDF file. It is very easy and you only need three lines of code to accomplish this task.
Make sure Spire.PDF for .NET has been installed correctly and then add Spire.Pdf.dll as reference in the downloaded Bin folder though the below path: "..\Spire.Pdf\Bin\NET4.0\Spire.Pdf.dll".
The following code snippet shows you how to insert an empty page in a PDF file. We will show you how to add the empty page at the end of the file and as the second page of the file.
//create a PDF document and load file
PdfDocument doc = new PdfDocument();
doc.LoadFromFile("sample.pdf");
//insert blank page at the end of the PDF file
doc.Pages.Add();
//insert blank page as the second page
doc.Pages.Insert(1);
//Save the document to file
doc.SaveToFile("result.pdf");
Check the effective screenshots as below:
Add the blank page at the end of the PDF file:
Add the blank page as the second page of the PDF file:
Full codes:
using Spire.Pdf;
using System;
namespace InsertPage
{
class Program
{
static void Main(string[] args)
{
//create PdfDocument instance and load file
PdfDocument doc = new PdfDocument();
doc.LoadFromFile("sample.pdf");
//insert blank page as last page
doc.Pages.Add();
doc.SaveToFile("result.pdf");
doc.Close();
System.Diagnostics.Process.Start("result.pdf");
//create PdfDocument instance and load file
PdfDocument doc2 = new PdfDocument();
doc2.LoadFromFile("sample.pdf");
//insert blank page as second page
doc2.Pages.Insert(1);
doc2.SaveToFile("result2.pdf");
doc2.Close();
System.Diagnostics.Process.Start("result2.pdf");
}
}
}
PDF files are widely used for sharing and viewing documents across different platforms, while TIFF files are preferred for storing high-quality images with detailed graphics or photographs. Converting a PDF file to TIFF can maintain the quality of images within the file. Similarly, converting a TIFF image to PDF ensures that the image can be easily viewed, shared, and printed without compatibility issues. In this article, you will learn how to programmatically convert PDF to TIFF or TIFF to PDF in C# using Spire.PDF for .NET.
Install Spire.PDF for .NET
To begin with, you need to add the DLL files included in the Spire.PDF for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.PDF
Convert PDF to TIFF in C#
The TIFF format allows multiple images to be stored in a single file. With Spire.PDF for .NET, you can convert each page of a PDF file into a separate image, and then call the custom method JoinTiffImages() to combine these images and save them as a single TIFF image.
The following are the steps to convert a PDF into a multi-page TIFF file using C#.
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Call custom method SaveAsImage() to convert each page of the PDF to a separate image.
- Call custom method JoinTiffImages() to merge the converted images into a multi-page TIFF image.
- C#
using System;
using System.Drawing;
using System.Drawing.Imaging;
using Spire.Pdf;
namespace SavePdfAsTiff
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument object
PdfDocument pdf = new PdfDocument();
//Load a PDF document
pdf.LoadFromFile("Report.pdf");
//Convert PDF pages to images
Image[] images = SaveAsImage(pdf);
//Combine the images and save them as a multi-page TIFF file
JoinTiffImages(images, "result.tiff", EncoderValue.CompressionLZW);
}
private static Image[] SaveAsImage(PdfDocument document)
{
//Create a new image array
Image[] images = new Image[document.Pages.Count];
//Iterate through all pages in the document
for (int i = 0; i < document.Pages.Count; i++)
{
//Convert a specific page to an image
images[i] = document.SaveAsImage(i);
}
return images;
}
private static ImageCodecInfo GetEncoderInfo(string mimeType)
{
//Get the image encoders
ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
for (int j = 0; j < encoders.Length; j++)
{
//Find the encoder that matches the specified MIME type
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)
{
//Set the encoder parameters
Encoder enc = Encoder.SaveFlag;
EncoderParameters ep = new EncoderParameters(2);
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
ep.Param[1] = new EncoderParameter(Encoder.Compression, (long)compressEncoder);
//Get the first image
Image pages = images[0];
//Initialize a frame
int frame = 0;
//Get an ImageCodecInfo object for processing TIFF image codec information
ImageCodecInfo info = GetEncoderInfo("image/tiff");
//Iterate through each Image
foreach (Image img in images)
{
//If it's the first frame, save it to the output file with specified encoder parameters
if (frame == 0)
{
pages = img;
pages.Save(outFile, info, ep);
}
else
{
//Save the intermediate frames
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
pages.SaveAdd(img, ep);
}
//If it's the last frame, flush the encoder parameters and close the file
if (frame == images.Length - 1)
{
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
pages.SaveAdd(ep);
}
frame++;
}
}
}
}
Convert TIFF to PDF in C#
To convert a multi-page TIFF image to a PDF file, you need to convert each frame of the TIFF image to a separate PDF image. Then draw each image at a specified location on a PDF page through the PdfPageBase.Canvas.DrawImage() method.
The following are the steps to convert a TIFF image to a PDF file using C#.
- Create a PdfDocument object.
- Load a TIFF image using Image.FromFile() method.
- Call custom method SplitTiffImage() to split the TIFF image into separate images.
- Iterate through the split images, and then convert each into a PDF image.
- Add a page to the PDF document using PdfDocument.Pages.Add() method.
- Draw the PDF image at a specified location on the page using PdfPageBase.Canvas.DrawImage() method.
- Save the result PDF file using PdfDocument.SaveToFile() method.
- C#
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using Spire.Pdf;
using Spire.Pdf.Graphics;
namespace TiffToPdf
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument object
PdfDocument pdf = new PdfDocument();
//Load a TIFF image
Image tiffImage = Image.FromFile("result.tiff");
//Split the Tiff image into separate images
Image[] images = SplitTiffImage(tiffImage);
//Iterate through the images
for (int i = 0; i < images.Length; i++)
{
//Convert a specified image into a PDF image
PdfImage pdfImg = PdfImage.FromImage(images[i]);
//Get image width and height
float width = pdfImg.Width;
float height = pdfImg.Height;
//Add a page with the same size as the image
SizeF size = new SizeF(width, height);
PdfPageBase page = pdf.Pages.Add(size);
//Draw the image at a specified location on the page
page.Canvas.DrawImage(pdfImg, 0, 0, width, height);
}
//Save the result file
pdf.SaveToFile("TiffToPdf.pdf");
}
public static Image[] SplitTiffImage(Image tiffImage)
{
//Get the number of frames in the Tiff image
int frameCount = tiffImage.GetFrameCount(FrameDimension.Page);
//Create an image array to store the split tiff images
Image[] images = new Image[frameCount];
//Gets the GUID of the first frame dimension
Guid objGuid = tiffImage.FrameDimensionsList[0];
//Create a FrameDimension object
FrameDimension objDimension = new FrameDimension(objGuid);
//Iterate through each frame
for (int i = 0; i < frameCount; i++)
{
//Select a specified frame
tiffImage.SelectActiveFrame(objDimension, i);
//Save the frame in TIFF format to a memory stream
MemoryStream ms = new MemoryStream();
tiffImage.Save(ms, ImageFormat.Tiff);
//Load an image from memory stream
images[i] = Image.FromStream(ms);
}
return images;
}
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
