Shulou(Shulou.com)06/03 Report--

Today, I will talk to you about how to understand the .NET Office component Spire, many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

In project development, especially in the business system of enterprises, there are many operations on documents, and sometimes it almost gives people an illusion that "this system seems to operate documents specifically." After all, many offices now mostly operate documents and other software on the PC side. In these huge and onerous businesses, the cost of relying solely on manpower to do document operations is huge, such as data statistics, data analysis and other business requirements. This requires that when we develop the system, we should try our best to reduce some of the users' workload, such as writing the data directly into the document, obtaining the web page information and saving it as PDF directly, so that we can continue to view it in the future. The purpose of software development is to be convenient for users, but this requirement is not necessarily convenient for developers.

As a developer, I also have this point of view, but sometimes I also think about which is better to charge or free tools. In fact, this kind of thinking seems meaningless in the end, because things have existing value. Free can reduce costs, charging can get stable and secure support, each has its own advantages and characteristics. The generation of any software requires cost, because any software is developed by personnel, and the corresponding cost needs to be paid. There is no charge here, and there will be charges in other places. No matter which is better, no matter which one is free or charged, there is nothing wrong with the technology. we can also understand and make a technical reserve of what is charged.

One of the components to be introduced today has a charging part and a free part, but the function of this software is indeed relatively powerful and easy to use, because what you want to charge needs to be humanized after all, otherwise who will pay to buy it? after all, there are few cheap and easy-to-use things. The way to use this component is very simple, the official provides a relatively complete operation of demo, so today's article is only used as an introduction.

As there are many components in Spire, you can use Spire.PDF for .NET as an introduction today. If you need stable service support, you can consider charging components. After all, it is very convenient to use them in the project.

I. Overview of Spire.PDF for .NET components:

Spire.PDF for .NET is a professional PDF component for creating, writing, editing, processing, and reading PDF files in .NET applications without any external dependencies. With this .NET PDF library, you can achieve rich functionality to create PDF files from scratch or to process existing PDF documents entirely through caching / VB.NET without installing Adobe Acrobat.

The .NET PDF API supports many rich features, such as security settings (including digital signatures), PDF text / attachment / image extraction, PDF merge / split, metadata updates, segments, image / image drawing and insertion, table creation and data processing and import.

In addition, Spire.PDF for .NET can be used to easily convert text, images, and HTML to PDF with clocked / VB.NET in high quality.

The following is an official component analysis diagram:

Spire.PDF for .NET supports the conversion of HTML,RTF,XPS, text, and images into PDF documents with efficient performance. Developers can convert PDF to Word,XPS,SVG,EMF,JPG,PNG,BMP,TIFF, text format. In addition, with Spire.Doc for .NET and Spire.XLS for .NET, developers can convert Word (Doc / Docx), Excel (Xls / Xlsx) and XML to PDF.

The function of this component is still very powerful, and every developer knows that the product is not well done, and it is very difficult to get the customer's money. Take a look at the main functions of the component:

1. Text format, multilingual support, text alignment, etc.

two。 Pens and brushes draw shape elements, text, and images into PDF documents.

3. Layers, transparent graphics, color space and bar code creation can be rendered as PDF documents.

4.PDF / Amur1b and PDF / x1a:2001 compliance, which can be applied.

5. Add a scalar / vector image and mask and place them in the specified location.

6.Spire.PDF for .NET supports tables and table styles

7. Insert interactive elements, including comments, actions, JavaScript, attachments, bookmarks and specified location and appearance.

The above gives a brief introduction to the relevant background of the component, and makes a simple list of the functions and use cases of the component.

2. Resolution of Spire.PDF for .NET related classes:

Here mainly introduces the Spire.PDF component part of Spire, this component has two versions, free and charged, the free version does not charge much in the function, but the stability and practicality are still high. Let's take a look at the main classes and methods of this component. Here we mainly introduce the operation of PDF. Let's first take a look at the operation classes and methods of PDF.

Take a look at the main classes of the following namespaces:

The above methods only operate the PDF part classification, because it contains more classes, too much introduction space appears redundant, and provides more methods in the operation of PDF, so it will be more rich in function and more convenient to use.

1.PdfDocument class: declare the PDF document:

(1). Constructor of the PdfDocument class:

Public PdfDocument (); public PdfDocument (string filename); public PdfDocument (byte [] bytes); public PdfDocument (Stream stream); public PdfDocument (string filename, string password); public PdfDocument (byte [] bytes, string password); public PdfDocument (Stream stream, string password)

This class provides overloaded versions of seven constructors, and the corresponding parameter types are not described in detail.

(2) .PdfDocument.LoadFromHTML (): load the HTML page:

Public void LoadFromHTML (string Url, bool enableJavaScript, bool enableHyperlinks, bool autoDetectPageBreak) {/ / This item is obfuscated and can not be translated. PdfHtmlLayoutFormat format; int num; goto Label_001E;Label_008F: num = 0 Clip.Width; format.FitToHtml Labeled0002: switch (num) {case 0: break; case 1: if (! autoDetectPageBreak) {format.Layout = PdfLayoutType.OnePage; format.FitToPage = Clip.Width; format.FitToHtml = Clip.Height; num = 2;} else {num = 3 } goto Label_0002; case 2: switch ((1 = = 1)) {case 2: goto Label_008F;} if (0! = 0) {} break; case 3: format.Layout = PdfLayoutType.Paginate; format.FitToPage = Clip.Width; goto Label_008F; default: goto Label_001E If (1! = 0) {} format = new PdfHtmlLayoutFormat (); num = 1; goto Label_0002;} this.Sections.Add (). LoadFromHTML (Url, enableJavaScript, enableHyperlinks, format);}

2.HtmlConverter namespace: Html converter.

Namespace Spire.Pdf.HtmlConverter {public enum AspectRatio public enum Clip [ToolboxItem (false)] public class HtmlConverter: UserControl, spr, spr public enum ImageType public class PdfHtmlLayoutFormat} private Metafile (); static HtmlConverter (); public HtmlConverter (); public int Authenticate (ref IntPtr phwnd, ref IntPtr pszUsername, ref IntPtr pszPassword); public HtmlToPdfResult Convert (string url, ImageType type, int width, int height, AspectRatio aspectRatio); public HtmlToPdfResult Convert (string html, string baseurl, ImageType type, int width, int height, AspectRatio aspectRatio) Public HtmlToPdfResult Convert (string url, ImageType type, int width, int height, AspectRatio aspectRatio, string username, string password); public Image ConvertToImage (string url, ImageType type); public Image ConvertToImage (Stream stream, Encoding encoding, ImageType type); public Image ConvertToImage (string url, ImageType type, int width); public Image ConvertToImage (Stream stream, Encoding encoding, ImageType type, int width); public Image ConvertToImage (string url, ImageType type, int width, int height); public Image ConvertToImage (string url, ImageType type, string username, string password) Public Image ConvertToImage (Stream stream, Encoding encoding, ImageType type, int width, int height); public Image ConvertToImage (string url, ImageType type, int width, int height, AspectRatio aspectRatio); public Image ConvertToImage (string url, ImageType type, int width, string username, string password); public Image ConvertToImage (Stream stream, Encoding encoding, ImageType type, int width, int height, AspectRatio aspectRatio); public Image ConvertToImage (string url, ImageType type, int width, int height, string username, string password) Public Image ConvertToImage (string url, ImageType type, int width, int height, AspectRatio aspectRatio, string username, string password); [DispId (- 5512)] public int CustomizeDownload (); protected override void Dispose (bool disposing); public Image FromString (string html, ImageType type, int width); public Image FromString (string html, string baseUrl, ImageType type); public Image FromString (string html, ImageType type, int width, int height); public Image FromString (string html, string baseUrl, ImageType type, int width) Public Image FromString (string html, ImageType type, int width, int height, AspectRatio aspectRatio); public Image FromString (string html, string baseUrl, ImageType type, int width, int height); public Image FromString (string html, string baseUrl, ImageType type, int width, int height, AspectRatio aspectRatio); public Image FromString (string html, string baseUrl, ImageType type, int width, int height, AspectRatio aspectRatio, string username, string password); public Image [] GetImagesFromString (string html, string baseUrl, ImageType type); public int QueryService (ref Guid guidService, ref Guid riid, ref Guid riid) Int spr Secret.GetSecurityId (string pwszUrl, IntPtr pbSecurityId, ref uint pcbSecurityId, ref uint dwReserved); int spr Secret.GetSecuritySite (out IntPtr pSite); int spr Secret.GetZoneMappings (uint dwZone, out IEnumString ppenumString, uint dwFlags); int spr Secret.MapUrlToZone (string pwszUrl, out uint pdwZone, uint dwFlags); int spr construc.ProcessUrlAction (string pwszUrl, uint dwAction, IntPtr pPolicy, uint cbPolicy, IntPtr pContext, uint cbContext, uint dwFlags, uint dwReserved) Int spr room.QueryCustomPolicy (string pwszUrl, ref Guid guidKey, out IntPtr ppPolicy, out uint pcbPolicy, IntPtr pContext, uint cbContext, uint dwReserved); int spr room.SetSecuritySite (IntPtr pSite); int spr room.SetZoneMapping (uint dwZone, string lpszPattern, uint dwFlags); int spr room.GetContainer (object ppContainer); int spr room.GetMoniker (uint dwAssign, uint dwWhichMoniker, object ppmk); int spr room.OnShowWindow (bool fShow); int spr room.RequestNewObjectLayout (); int spr room.SaveObject (); int spr room.ShowObject ()

The above is the view of the relevant classes and methods of PDF operation. Because this software is commercial software, we can only view part of the code that is exposed to the public, but the complexity of its internal implementation can be seen from the code that can be seen.

3. Spire.PDF for .NET instance:

Since this article is mainly about converting HTML pages into PDF documents, we first provide a GET request HTML page and an operation method to get page images. Then it introduces the operation methods of creating PDF document, converting Text into PDF, converting XPS into PDF,Image into PDF and so on.

1. Create a GET request for HTTP to get web page information:

/ / send GET request / public static string HttpGet (string getUrl) {try {if (string.IsNullOrEmpty (getUrl)) throw new ArgumentNullException (getUrl); var request = WebRequest.Create (getUrl) as HttpWebRequest; if (request = = null) return null; var cookieContainer = new CookieContainer () Request.CookieContainer = cookieContainer; request.AllowAutoRedirect = true; request.Method = "GET"; request.ContentType = "application/x-www-form-urlencoded"; var response = request.GetResponse () as HttpWebResponse; if (response! = null) {var instream = response.GetResponseStream (); if (instream = = null) throw new ArgumentNullException ("getUrl"); string content Using (var sr = new StreamReader (instream, Encoding.UTF8)) {content = sr.ReadToEnd ();} return content;}} catch (Exception er) {throw new Exception (er.Message);} return null;}

two。 Get the URL of all the pictures in HTML:

/ get the URL of all the pictures in the HTML. / HTML code / URL list of pictures public static string HtmlCodeRequest (string url) {if (string.IsNullOrEmpty (url)) {throw new ArgumentNullException (url);} try {/ / create a request var httprequst = (HttpWebRequest) WebRequest.Create (url); / / No persistent link httprequst.KeepAlive = true / / set the requested method httprequst.Method = "GET"; / / set the header value httprequst.UserAgent = "User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705"; httprequst.Accept = "* / *"; httprequst.Headers.Add ("Accept-Language", "zh-cn,en-us;q=0.5") Httprequst.ServicePoint.Expect100Continue = false; httprequst.Timeout = 5000; / / whether to allow 302 httprequst.AllowAutoRedirect = true; ServicePointManager.DefaultConnectionLimit = 30; / / get response var webRes = (HttpWebResponse) httprequst.GetResponse (); / / get the text stream string content of the response Using (var stream = webRes.GetResponseStream ()) {using (var reader = new StreamReader (stream, Encoding.GetEncoding ("utf-8")) {content = reader.ReadToEnd ();}} / / cancel request httprequst.Abort (); / / return data content return content } catch (Exception ex) {throw new Exception (ex.Message);}}

3. Create an PDF document:

PdfDocument doc = new PdfDocument (); doc.LoadFromHTML (url, false, true, true); doc.Close ()

The above operation is not assembled into a method, because the creation operation is relatively simple, so it is not described in detail. Url is the path address of the web page.

HtmlConverter.Convert ("http://www.wikipedia.org/","HTMLtoPDF.pdf", / / enable javascript true, / / load timeout* 1000 Grammar page sizenew SizeF (612792), / / page marginsnew PdfMargins (0,0))

Convert 4.Text to PDF:

Public static void TextLayout () {/ / Create a pdf document. PdfDocument doc = new PdfDocument (); / / Create one page PdfPageBase page = doc.Pages.Add (); float pageWidth = page.Canvas.ClientSize.Width; float y = 0; / / page header PdfPen pen1 = new PdfPen (Color.LightGray, 1f); PdfBrush brush2 = new PdfSolidBrush (Color.LightGray); PdfTrueTypeFont font1 = new PdfTrueTypeFont (new Font ("Arial", 8f, FontStyle.Italic)); PdfStringFormat format1 = new PdfStringFormat (PdfTextAlignment.Right) String text = "Demo of Spire.Pdf"; page.Canvas.DrawString (text, font1, brush2, pageWidth, y, format1); SizeF size = font1.MeasureString (text, format1); y = y + size.Height + 1; page.Canvas.DrawLine (pen1, 0, y, pageWidth, y); / / title y = y + 5; PdfBrush brush3 = new PdfSolidBrush (Color.Black) PdfTrueTypeFont font2 = new PdfTrueTypeFont (new Font ("Arial", 16f, FontStyle.Bold)); PdfStringFormat format2 = new PdfStringFormat (PdfTextAlignment.Center); format2.CharacterSpacing = 1f; text = "Summary of Science"; page.Canvas.DrawString (text, font2, brush3, pageWidth / 2, y, format2); size = font2.MeasureString (text, format2); y = y + size.Height + 6 / / icon PdfImage image = PdfImage.FromFile (@ "..\..\ Data\ Wikipedia_Science.png"); page.Canvas.DrawImage (image, new PointF (pageWidth-image.PhysicalDimension.Width, y)); float imageLeftSpace = pageWidth-image.PhysicalDimension.Width-2; float imageBottom = image.PhysicalDimension.Height + y; / / refenrence content PdfTrueTypeFont font3 = new PdfTrueTypeFont (new Font ("Arial", 9f)) PdfStringFormat format3 = new PdfStringFormat (); format3.ParagraphIndent = font3.Size * 2; format3.MeasureTrailingSpaces = true; format3.LineSpacing = font3.Size * 1.5f; String text1 = "(All text and picture from"; String text2 = "Wikipedia"; String text3 = ", the free encyclopedia)"; page.Canvas.DrawString (text1, font3, brush3, 0, y, format3); size = font3.MeasureString (text1, format3) Float x1 = size.Width; format3.ParagraphIndent = 0; PdfTrueTypeFont font4 = new PdfTrueTypeFont (new Font ("Arial", 9f, FontStyle.Underline)); PdfBrush brush4 = PdfBrushes.Blue; page.Canvas.DrawString (text2, font4, brush4, x1, y, format3); size = font4.MeasureString (text2, format3); x1 = x1 + size.Width; page.Canvas.DrawString (text3, font3, brush3, x1, y, format3) Y = y + size.Height; / / content PdfStringFormat format4 = new PdfStringFormat (); text = System.IO.File.ReadAllText (@ "..\..\ Data\ Summary_of_Science.txt"); PdfTrueTypeFont font5 = new PdfTrueTypeFont (new Font ("Arial", 10f)); format4.LineSpacing = font5.Size * 1.5f; PdfStringLayouter textLayouter = new PdfStringLayouter (); float imageLeftBlockHeight = imageBottom-y PdfStringLayoutResult result = textLayouter.Layout (text, font5, format4, new SizeF (imageLeftSpace, imageLeftBlockHeight)); if (result.ActualSize.Height < imageBottom-y) {imageLeftBlockHeight = imageLeftBlockHeight + result.LineHeight; result = textLayouter.Layout (text, font5, format4, new SizeF (imageLeftSpace, imageLeftBlockHeight);} foreach (LineInfo line in result.Lines) {page.Canvas.DrawString (line.Text, font5, brush3, 0, y, format4) Y = y + result.LineHeight;} PdfTextWidget textWidget = new PdfTextWidget (result.Remainder, font5, brush3); PdfTextLayout textLayout = new PdfTextLayout (); textLayout.Break = PdfLayoutBreakType.FitPage; textLayout.Layout = PdfLayoutType.Paginate; RectangleF bounds = new RectangleF (new PointF (0, y), page.Canvas.ClientSize); textWidget.StringFormat = format4; textWidget.Draw (page, bounds, textLayout); / / Save pdf file. Doc.SaveToFile ("TextLayout.pdf"); doc.Close (); / / Launching the Pdf file. PDFDocumentViewer ("TextLayout.pdf");}

Convert 5.XPS to PDF:

Public void XPStoPDF () {/ / xps file String file = @ "..\..\ Data\ Sample4.xps"; / / open xps document PdfDocument doc = new PdfDocument (); doc.LoadFromXPS (file); / / convert to pdf file. Doc.SaveToFile ("Sample4.pdf"); doc.Close (); / / Launching the Pdf file. PDFDocumentViewer ("Sample4.pdf");}

Convert 6.Image to PDF:

Public void ImageToPdf () {/ / Create a pdf document. PdfDocument doc = new PdfDocument (); / / Create one page PdfPageBase page = doc.Pages.Add (); / / Draw the text page.Canvas.DrawString ("Hello, World!", new PdfFont (PdfFontFamily.Helvetica, 30f), new PdfSolidBrush (Color.Black), 10,10) / / Draw the image PdfImage image = PdfImage.FromFile (@ "..\..\ Data\ SalesReportChart.png"); float width = image.Width * 0.75f; float height = image.Height * 0.75f; float x = (page.Canvas.ClientSize.Width-width) / 2; page.Canvas.DrawImage (image, x, 60, width, height); / / Save pdf file. Doc.SaveToFile ("Image.pdf"); doc.Close (); / / Launching the Pdf file. PDFDocumentViewer ("Image.pdf");}

The above provides initiating a HTTP request to the website, obtaining the page information of the website, and using the Spire.PDF component to create an PDF document. If necessary, the information obtained by the HTTP request can be directly loaded into the component such as Spire.PDF.

The components directly convert the web page information into PDF files, so I will not repeat it here. As the official demo and operation documents are provided by the government, I will not introduce the usage here too much.

The above introduced a non-open source component, there is no more in-depth introduction, because the component is not open source, can not be decompiled, after all, there is a copyright problem, if you need to use enterprise-level document operation components, and the company is not short of money, you can use this component, the underlying method of the component is highly encapsulated, so when using it What developers need to think about is how to use components to complete the function.

After reading the above, do you have any further understanding of how to understand the .NET Office component Spire? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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