Use Itextsharp component to add image watermark to PDF document, text watermark

Recently in doing a PDF document add Watermark function, toss a long time, finally good. Make a note of the following:

First will use the ITEXTSHARP components, we can go to the official website to download, at the same time I will be attached in this article.

The code adds a reference to:

Using System;  Using System.Collections.Generic;  Using System.Linq;  Using System.Text;  Using iTextSharp.text.pdf;  Using System.IO;  Using

Create a PDF that displays the specified picture

<summary>///Create a PDF showing the specified picture///</summary>//<param name= "Picpdfpath" ></p aram>//<param name= "Picpath" ></param>///<returns></returns> Public St atic bool Createpdfbypic (string picpdfpath,string picpath) {//Create a new document doc = new DOCU            ment (); try {//Create a writer (writer) associated with the Document Object Pdfwriter.getinstance (Doc, New FileStream (pi                Cpdfpath, FileMode.Create, FileAccess.ReadWrite)); Open a document Doc.                Open ();                Add content to the document Image img = image.getinstance (picpath); Img.                SetAbsolutePosition (); Doc.                Add (IMG);            return true;                } catch (Exception ex) {return false;            Throw ex;    } finally {if (doc! = null) {                Doc.                Close (); }            }         }

Add a picture watermark to a PDF document

<summary>//Plus picture watermark///</summary>//<param name= "Inputfilepath" &GT;&LT;/PARAM&G        T <param name= "Outputfilepath" ></param>//<param name= "Modelpicname" ></param>// /<param name= "top" ></param>//<param name= "left" ></param>//<returns>< /returns> public static bool Pdfwatermark (string Inputfilepath, String Outputfilepath, String modelpicname, Floa            T top, float left) {//throw new notimplementedexception ();            Pdfreader pdfreader = null;            Pdfstamper pdfstamper = null;                 try {pdfreader = new Pdfreader (Inputfilepath);                 int numberofpages = pdfreader.numberofpages;                 ITextSharp.text.Rectangle psize = pdfreader.getpagesize (1); Float width = psize.                 Width; float height = psize.                 Height; Pdfstamper = new PDfstamper (Pdfreader, New FileStream (Outputfilepath, FileMode.Create));                 Pdfcontentbyte watermarkcontent;                 ITextSharp.text.Image Image = iTextSharp.text.Image.GetInstance (modelpicname); Image. Grayfill = 20;//transparency, gray fill//image. rotation//rotating//image. rotationdegrees//rotation angle//watermark position if (left < 0) {left = W IDTH/2-image.                Width + left; }//image. SetAbsolutePosition (left, (height-image).                Height)-top); Image. SetAbsolutePosition (left, (HEIGHT/2-image).                  Height)-top); Watermark per page, you can also set a page watermark for (int i = 1; I <= numberofpages; i++) {//wat Ermarkcontent = Pdfstamper.getundercontent (i);//content lower watermark Watermarkcontent = pdfstamper.getovercontent (i)                ;//Content Upper Watermark watermarkcontent.addimage (image);      }          STRMSG = "Success";            return true;                             } catch (Exception ex) {throw ex;                 } finally {if (pdfstamper! = null) pdfstamper.close ();            if (Pdfreader! = null) pdfreader.close (); }        }

Add normal deflection angle text watermark

<summary>////Add normal deflection angle text watermark///</summary>//<param name= "Inputfilepath" ></ param>//<param name= "Outputfilepath" ></param>//<param name= "Watermarkname" ></p aram>//<param name= "permission" ></param> public static void Setwatermark (String inputfilep            Ath, String outputfilepath,string watermarkname) {Pdfreader pdfreader = null; Pdfstamper pdfstamper = null;
            Gets the used right pdfreader.unethicalreading = true;                try {pdfreader = new Pdfreader (Inputfilepath);                Pdfstamper = new Pdfstamper (Pdfreader, New FileStream (Outputfilepath, FileMode.Create));                int total = pdfreader.numberofpages + 1;                ITextSharp.text.Rectangle psize = pdfreader.getpagesize (1); Float width = psize.                Width; float height = psize.                Height;                Pdfcontentbyte content; Basefont font = Basefont.createfont (@ "C:\WINDOWS\Fonts\SIMFANG.                TTF ", Basefont.identity_h, basefont.embedded);                Pdfgstate GS = new Pdfgstate ();                    for (int i = 1, i < total; i++) {content = Pdfstamper.getovercontent (i);//watermark above content Content = Pdfstamper.getundercontent (i);//Add watermark below contents//Transparency GS.                    fillopacity = 0.3f; Content. Setgstate (GS);                    Content.                    Setgrayfill (0.3f); Begins writing to the text content.                    Begintext (); Content.                    Setcolorfill (Basecolor.light_gray); Content.                    Setfontandsize (font, 100); Content.                    Settextmatrix (0, 0); Content.                    Showtextaligned (Element.align_center, Watermarkname, WIDTH/2-50,HEIGHT/2-50, 55); Content.                    Setcolorfill (Basecolor.black); Content.                    Setfontandsize (font, 8); Content.                    Showtextaligned (Element.align_center, watermarkname, 0, 0, 0); Content.                Endtext ();            }}catch (Exception ex) {throw ex;                 } finally {if (pdfstamper! = null) pdfstamper.close ();            if (Pdfreader! = null) pdfreader.close (); }        }

Add an oblique watermark

<summary>///Add tilt watermark////</summary>//<param name= "Inputfilepath" ></param&        Gt <param name= "Outputfilepath" ></param>//<param name= "Watermarkname" ></param>/ <param name= "UserPassword" ></param>//<param name= "OwnerPassword" ></param>// <param name= "permission" ></param> public static void Setwatermark (String inputfilepath, String Outputfi Lepath, String watermarkname, String UserPassword, string ownerpassword, int permission) {Pdfreader PDF            Reader = null;            Pdfstamper pdfstamper = null;                try {pdfreader = new Pdfreader (Inputfilepath);                Pdfstamper = new Pdfstamper (Pdfreader, New FileStream (Outputfilepath, FileMode.Create));                  Set Password//pdfstamper.setencryption (False,userpassword, OwnerPassword, permission); INT Total = pdfreader.numberofpages + 1;                Pdfcontentbyte content; Basefont font = Basefont.createfont (@ "C:\WINDOWS\Fonts\SIMFANG.                TTF ", Basefont.identity_h, basefont.embedded);                Pdfgstate GS = new Pdfgstate (); Gs.                fillopacity = 0.2f;//transparency Int j = Watermarkname.length;                char c;                int rise = 0;                    for (int i = 1; i < total; i++) {rise = 500;                                         Content = Pdfstamper.getovercontent (i);//watermark above contents//content = Pdfstamper.getundercontent (i);//Add watermark underneath content Content.                    Begintext (); Content.                    Setcolorfill (Basecolor.dark_gray); Content.                    Setfontandsize (font, 50); Set Watermark text font tilt start if (j >=) {content.                        Settextmatrix (200, 120); for (int k = 0; K < J k++) {content.                            Settextrise (Rise);                            c = Watermarkname[k]; Content.                            Showtext (c + "");                        Rise-= 20; }} else {content.                        Settextmatrix (180, 100); for (int k = 0; k < J; k++) {content.                            Settextrise (Rise);                            c = Watermarkname[k]; Content.                            Showtext (c + "");                        Rise-= 18; }}//font settings end content.                    Endtext (); Draw a round//content.                    Ellipse (250, 450, 350, 550); Content.                    Setlinewidth (1f); Content.                 Stroke (); }} catch (Exception ex) {throw ex;                 } finally {if (pdfstamper! = null) pdfstamper.close ();            if (Pdfreader! = null) pdfreader.close (); }        }

Examples of calling methods:

String path = "D://my.pdf";               Htmltopdfutil.htmltopdf (Request.Url.AbsoluteUri, path);               Htmltopdfutil.htmltopdf (sburllist.tostring (), path);               Pdfsetwatermark.pdfwatermark (Path, "D://my.pdf", Server.MapPath ("/htmltopdf/tools/sy.bmp"), 0, 0);               Pdfsetwatermark.setwatermark ("D://my.pdf", "D://my2.pdf", "TEST");               Pdfsetwatermark.setwatermark ("D://my.pdf", "D://my2.pdf", "TEST", "", "", 1);

Use Itextsharp component to add image watermark to PDF document, text watermark