[C /vb.net] convert PDF to svg/image, svg/image to PDF

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SVG Is a graphics file format , Its full English name is Scalable Vector Graphics, It means scalable vector graphics . Its graphic quality will not be lost when it is enlarged or its size is changed , And with the JPG and GIF Image comparison , Smaller size , And more compressible . This article describes how to implement the PDF Documentation and SVG/Image The method of mutual conversion . After comprehensive comparison , Finally, this method was screened out . This method is easy to operate and has less code . Here are the detailed steps and C#/VB.NET Code for your reference .

** Class library introduction and code ideas ：** In this function test , What we use is ​ ​ Free Spire.PDF for .NET​​.Spire.PDF.dll The introduction method of the document is as follows ： Method 1： take Free Spire.PDF for .NET Download to local , decompression , install . After installation , Find the installation path BIN In folder Spire.PDF.dll. And then in Visual Studio Open in “ Solution explorer ”, Right click “ quote ”,“ Add reference ”, The local path BIN Under folder dll Add a reference to the program . Method 2： adopt ​ ​NuGet​​ install . This can be done by 2 Methods of installation ：（1） Can be in Visual Studio Open in “ Solution explorer ”, Right click “ quote ”,“ management NuGet package ”, And then the search “Free Spire.PDF”, Click on “ install ”. Wait for the program installation to complete .（2） Copy the following to PM Console installation .Install-Package FreeSpire.PDF -Version 8.2.0

take PDF To SVG Format

Specific steps :

• establish PdfDocument Class object .
• call PdfDocument.LoadFromFile() Method loading PDF file .
• adopt PdfDocument.SaveToFile() Method as SVG Format .

Complete code ：

【C#】

using System;
using Spire.Pdf;


namespace PdfToSVG
{
 class Program
 {
 static void Main(string[] args)
 {
 
 // Create and load PDF file 
            PdfDocument doc = new PdfDocument();
 doc.LoadFromFile("Sample.pdf");

 // Save as SVG Format 
            doc.SaveToFile("ToSVG-result.svg", FileFormat.SVG);
 doc.Close();
 
 }
 }
}

【VB.NET】

Imports System
Imports Spire.Pdf

Namespace PdfToSVG
 
 Class Program
 
 Private Shared Sub Main(ByVal args() As String)
 ' Create and load PDF file 
            Dim doc As PdfDocument = New PdfDocument
 doc.LoadFromFile("Sample.pdf")
 ' Save as SVG Format 
            doc.SaveToFile("ToSVG-result.svg", FileFormat.SVG)
 doc.Close
 End Sub
    End Class
End Namespace

design sketch ：

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-RE7FnCwX-1655355097026)(https://img2022.cnblogs.com/blog/2859233/202206/2859233-20220616093937809-970468124.png)]

take SVG To PDF Format

Specific steps :

• Create a PdfDocument object .
• use PdfDocument.LoadFromSvg（） Method loading SVG file
• use PdfDocument.SaveToFile（） Method as PDF file

Complete code ：

【C#】

using Spire.Pdf;
using System;


namespace SVGToPdf
{
 class Program
 {
 static void Main(string[] args)
 {
 // Create a  PdfDocument  object .
            PdfDocument doc = new PdfDocument();

 // Load the document .
            doc.LoadFromSvg("ToSVG-result.svg");

 // Save the document .
            String result = "SVgToPDF\_out.pdf";
 doc.SaveToFile(result);


 }
 }
}

【VB.NET】

Imports Spire.Pdf
Imports System

Namespace SVGToPdf
 
 Class Program
 
 Private Shared Sub Main(ByVal args() As String)
 ' Create a  PdfDocument  object .
            Dim doc As PdfDocument = New PdfDocument
 ' Load the document .
            doc.LoadFromSvg("ToSVG-result.svg")
 ' Save the document 
            Dim result As String = "SVgToPDF\_out.pdf"
 doc.SaveToFile(result)
 End Sub
    End Class
End Namespace

design sketch ：

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-Zh3d1UUe-1655355097030)(https://img2022.cnblogs.com/blog/2859233/202206/2859233-20220616094234762-389225572.png)]

take PDF Convert to image

Specific steps :

• add to PDF file
• use PdfDocument.LoadFromFile() Method loading PDF file
• use Image.Save（） Method to save as a picture

Complete code ：

【C#】

using System;
using System.Drawing;
using Spire.Pdf;


namespace ToImage
{
 class Program
 {
 static void Main(string[] args)
 {
 

 // Create and load PDF file 
            PdfDocument doc = new PdfDocument();
 doc.LoadFromFile("Sample1.pdf");

 // Save as picture 
            for (int i = 0; i < doc.Pages.Count; i++)
 {
 String fileName = String.Format("ToImage-img-{0}.png", i);
 using (Image image = doc.SaveAsImage(i, 300, 300))
 {
 image.Save(fileName, System.Drawing.Imaging.ImageFormat.Png); 
 }
 }

 doc.Close();
 }
 }
}

【VB.NET】

Imports System
Imports System.Drawing
Imports Spire.Pdf

Namespace ToImage
 
 Class Program
 
 Private Shared Sub Main(ByVal args() As String)
 ' Create and load PDF file 
            Dim doc As PdfDocument = New PdfDocument
 doc.LoadFromFile("Sample1.pdf")
 ' Save as picture 
            Dim i As Integer = 0
            Do While (i < doc.Pages.Count)
 Dim fileName As String = String.Format("ToImage-img-{0}.png", i)
 Dim image As Image = doc.SaveAsImage(i, 300, 300)
 image.Save(fileName, System.Drawing.Imaging.ImageFormat.Png)
 i = (i + 1)
 Loop
 
 doc.Close
 End Sub
    End Class
End Namespace

design sketch ：

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-8ZNDZRhQ-1655355097031)(https://img2022.cnblogs.com/blog/2859233/202206/2859233-20220616095013266-1072419986.png)]

Turn the image into PDF Format

Specific steps :

• Create one that adds section And page pdf file .
• use PdfImage.FromFile（） Method load image
• stay PDF Set the display position and size of the image in
• adopt PdfImage.PhysicalDimension Property to get the picture size
• Use PdfPage.Canvas.DrawImage() Method on the first page (0, 30) Draw at PdfImage object
• Use PdfDocument.SaveToFile() Method to save the document as PDF file

Complete code ：

【C#】

using System;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Graphics;

namespace ImageToPdf
{
 class Program
 {
 static void Main(string[] args)
 {
 // Create one that adds section And page  pdf  file .
            PdfDocument pdf = new PdfDocument();
 PdfSection section = pdf.Sections.Add();
 PdfPageBase page = pdf.Pages.Add();

 // Loading pictures 
            PdfImage image = PdfImage.FromFile("image5.png");
 // stay  PDF  Set the display position and size of the image in 
 // Resize the picture to fit the page width 
            float widthFitRate = image.PhysicalDimension.Width / page.Canvas.ClientSize.Width;
 float heightFitRate = image.PhysicalDimension.Height / page.Canvas.ClientSize.Height;
 float fitRate = Math.Max(widthFitRate, heightFitRate);
 // Get image size  
            float fitWidth = image.PhysicalDimension.Width / fitRate;
 float fitHeight = image.PhysicalDimension.Height / fitRate;
 // mapping 
            page.Canvas.DrawImage(image, 0, 30, fitWidth, fitHeight);

 string output = "image.pdf";

 pdf.SaveToFile(output);


 }
 }
}

【VB.NET】

Imports System
Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace ImageToPdf
 
 Class Program
 
 Private Shared Sub Main(ByVal args() As String)
 '  Create one that adds section And page  pdf  file .
            Dim pdf As PdfDocument = New PdfDocument
 Dim section As PdfSection = pdf.Sections.Add
 Dim page As PdfPageBase = pdf.Pages.Add
 ' Loading pictures 
            Dim image As PdfImage = PdfImage.FromFile("image5.png")
 ' stay  PDF  Set the display position and size of the image in 
            ' Resize the picture to fit the page width 
            Dim widthFitRate As Single = (image.PhysicalDimension.Width / page.Canvas.ClientSize.Width)
 Dim heightFitRate As Single = (image.PhysicalDimension.Height / page.Canvas.ClientSize.Height)
 Dim fitRate As Single = Math.Max(widthFitRate, heightFitRate)
 '  Get image size 
            Dim fitWidth As Single = (image.PhysicalDimension.Width / fitRate)
 Dim fitHeight As Single = (image.PhysicalDimension.Height / fitRate)
 ' mapping 
            page.Canvas.DrawImage(image, 0, 30, fitWidth, fitHeight)
 Dim output As String = "image.pdf"
 pdf.SaveToFile(output)
 End Sub
    End Class
End Namespace

design sketch ：

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-8kVwhqf5-1655355097032)(https://img2022.cnblogs.com/blog/2859233/202206/2859233-20220616095305046-2077878358.png)]

** Be careful ：** The file path in the test code is program Debug route , For reference only , File paths can be customized to other paths .