Examples of implementation of PDF-generated image text watermarking in C #

This article mainly introduces the C # implementation of the PDF generated image text Watermark class, combined with a complete example of C # for the creation of PDF files, add text, watermark and other related operations skills, the need for friends can refer to the next

The example of this paper describes the C # implementation of the PDF generated image text Watermark class. Share to everyone for your reference, as follows:

public class pdfsetwatermark{//<summary>///Create a PDF showing the specified picture///</summary>//<param name= "    Picpdfpath "></param>//<param name=" Picpath "></param>//<returns></returns> public static bool Createpdfbypic (string Picpdfpath, String picpath) {//Create a new Document DOC = new documents ()      ; try {//Create a writer (writer) associated with the Document Object Pdfwriter.getinstance (Doc, New FileStream (Picpdfpath, Filemode.cre        Ate, 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 (); }}}///<summary>//Plus picture watermark///</summary>//<param name= "Inputfilepath" ></pa   Ram> <param name= "Outputfilepath" ></param>//<param name= "Modelpicname" ></param>//<p    Aram Name= "Top" ></param>//<param name= "left" ></param>//<returns></returns>    public static bool Pdfwatermark (string Inputfilepath, String Outputfilepath, String modelpicname, float 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 = WIDTH/2-image.        Width + left; }//image. SetAbsolutePosition (left, (height-image).        Height)-top); Image. SetAbsolutePosition (left, (HEIGHT/2-image).        Height)-top); Each page watermark, you can also set a page watermark for (int i = 1; I <= numberofpages; i++) {//watermarkcontent = Pdfstamper. Getundercontent (i);//content 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 (); }}///<summary>///Add normal deflection angle text watermark///</summary>//<param name= "Inputfilepath" ></pa ram>//<param name="Outputfilepath" ></param>//<param name= "Watermarkname" ></param>//<param name= "Permissi On "></param> public static void Setwatermark (String inputfilepath, String Outputfilepath, String watermarkname      ) {Pdfreader pdfreader = null;      Pdfstamper pdfstamper = null;        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);//Add watermark above content//content = Pdfstamper.getundErcontent (i);//Add watermark below content//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-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 (); }}///<summary>///Add tilt watermark///</summary>//<param name= "Inputfilepath" ></param&gt    ; <param name= "OUtputfilepath "></param>//<param name=" Watermarkname "></param>//<param name=" Userpasswo RD "></param>//<param name=" OwnerPassword "></param>//<param name=" permission "></p aram> public static void Setwatermark (String inputfilepath, String Outputfilepath, String watermarkname, String user      PassWord, string ownerpassword, int permission) {Pdfreader pdfreader = 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 under content C Ontent.          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 (); }    }}