这篇文章主要介绍了c#实现的pdf生成图片文字水印类,结合完整实例形式分析了c#针对pdf文件的创建、添加文字、水印等相关操作技巧,需要的朋友可以参考下
本文实例讲述了c#实现的pdf生成图片文字水印类。分享给大家供大家参考，具体如下：
public class pdfsetwatermark
{
/// <summary>
/// 创建一个显示指定图片的pdf
/// </summary>
/// <param name="picpdfpath"></param>
/// <param name="picpath"></param>
/// <returns></returns>
public static bool createpdfbypic(string picpdfpath, string picpath)
{
//新建一个文档
document doc = new document();
try
{
//建立一个书写器(writer)与document对象关联
pdfwriter.getinstance(doc, new filestream(picpdfpath, filemode.create, fileaccess.readwrite));
//打开一个文档
doc.open();
//向文档中添加内容
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>
/// 加图片水印
/// </summary>
/// <param name="inputfilepath"></param>
/// <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, 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;//透明度，灰色填充
//image.rotation//旋转
//image.rotationdegrees//旋转角度
//水印的位置
if (left < 0)
{
left = width / 2 - image.width + left;
}
//image.setabsoluteposition(left, (height - image.height) - top);
image.setabsoluteposition(left, (height / 2 - image.height) - top);
//每一页加水印,也可以设置某一页加水印
for (int i = 1; i <= numberofpages; i++)
{
//watermarkcontent = pdfstamper.getundercontent(i);//内容下层加水印
watermarkcontent = pdfstamper.getovercontent(i);//内容上层加水印
watermarkcontent.addimage(image);
}
//strmsg = "success";
return true;
}
catch (exception ex)
{
throw ex;
}
finally
{
if (pdfstamper != null)
pdfstamper.close();
if (pdfreader != null)
pdfreader.close();
}
}
/// <summary>
/// 添加普通偏转角度文字水印
/// </summary>
/// <param name="inputfilepath"></param>
/// <param name="outputfilepath"></param>
/// <param name="watermarkname"></param>
/// <param name="permission"></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);//在内容上方加水印
//content = pdfstamper.getundercontent(i);//在内容下方加水印
//透明度
gs.fillopacity = 0.3f;
content.setgstate(gs);
//content.setgrayfill(0.3f);
//开始写入文本
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();
}
}
/// <summary>
/// 添加倾斜水印
/// </summary>
/// <param name="inputfilepath"></param>
/// <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 outputfilepath, string watermarkname, string userpassword, string ownerpassword, int permission)
{
pdfreader pdfreader = null;
pdfstamper pdfstamper = null;
try
{
pdfreader = new pdfreader(inputfilepath);
pdfstamper = new pdfstamper(pdfreader, new filestream(outputfilepath, filemode.create));
// 设置密码
//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;//透明度
int j = watermarkname.length;
char c;
int rise = 0;
for (int i = 1; i < total; i++)
{
rise = 500;
content = pdfstamper.getovercontent(i);//在内容上方加水印
//content = pdfstamper.getundercontent(i);//在内容下方加水印
content.begintext();
content.setcolorfill(basecolor.dark_gray);
content.setfontandsize(font, 50);
// 设置水印文字字体倾斜 开始
if (j >= 15)
{
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;
}
}
// 字体设置结束
content.endtext();
// 画一个圆
//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();
}
}
}
以上就是c#中pdf生成图片文字水印类的实现实例的详细内容。