This article describes the C# implementation of pdf generated image text watermark class. Share it for your reference, as follows:
public class PDFSetWaterMark
{
/// <summary>
/// Create a pdf that displays the specified image /// </summary>
/// <param name="picPdfPath"></param>
/// <param name="picPath"></param>
/// <returns></returns>
public static bool CreatePDFByPic(string picPdfPath, string picPath)
{
// Create a new document Document doc = new Document();
try
{
//Create a writer (Writer) and document object association (doc, new FileStream(picPdfPath, , ));
//Open a document ();
//Add content to the document Image img = (picPath);
//();
(img);
return true;
}
catch (Exception ex)
{
return false;
throw ex;
}
finally
{
if (doc != null)
{
();
}
}
}
/// <summary>
/// Add picture watermark /// </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 = ;
psize = (1);
float width = ;
float height = ;
pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, ));
PdfContentByte waterMarkContent;
image = (ModelPicName);
= 20;//Transparency, grey fill ////Rotation ////Rotation angle //The location of the watermark if (left < 0)
{
left = width / 2 - + left;
}
//(left, (height - ) - top);
(left, (height / 2 - ) - top);
// Add watermark to each page, or you can also set a watermark to add a certain page. for (int i = 1; i <= numberOfPages; i++)
{
//waterMarkContent = (i);// Add watermark to the lower layer of the content waterMarkContent = (i);// Add watermark to the upper layer of the content (image);
}
//strMsg = "success";
return true;
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (pdfStamper != null)
();
if (pdfReader != null)
();
}
}
/// <summary>
/// Add normal deflection angle text watermark /// </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, ));
int total = + 1;
psize = (1);
float width = ;
float height = ;
PdfContentByte content;
BaseFont font = (@"C:\WINDOWS\Fonts\", BaseFont.IDENTITY_H, );
PdfGState gs = new PdfGState();
for (int i = 1; i < total; i++)
{
content = (i);//Add a watermark above the content //content = (i);//Add a watermark below the content //transparency = 0.3f;
(gs);
//(0.3f);
//Start writing text ();
(BaseColor.LIGHT_GRAY);
(font, 100);
(0, 0);
(Element.ALIGN_CENTER, waterMarkName, width / 2 - 50, height / 2 - 50, 55);
//();
//(font, 8);
//(Element.ALIGN_CENTER, waterMarkName, 0, 0, 0);
();
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (pdfStamper != null)
();
if (pdfReader != null)
();
}
}
/// <summary>
/// Add tilt watermark /// </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, ));
// Set password //(false,userPassWord, ownerPassWord, permission);
int total = + 1;
PdfContentByte content;
BaseFont font = (@"C:\WINDOWS\Fonts\", BaseFont.IDENTITY_H, );
PdfGState gs = new PdfGState();
= 0.2f;//transparency int j = ;
char c;
int rise = 0;
for (int i = 1; i < total; i++)
{
rise = 500;
content = (i);//Add a watermark above the content //content = (i);//Add a watermark below the content ();
(BaseColor.DARK_GRAY);
(font, 50);
// Set the font tilt of the watermark text begin if (j >= 15)
{
(200, 120);
for (int k = 0; k < j; k++)
{
(rise);
c = waterMarkName[k];
(c + "");
rise -= 20;
}
}
else
{
(180, 100);
for (int k = 0; k < j; k++)
{
(rise);
c = waterMarkName[k];
(c + "");
rise -= 18;
}
}
// Font settings end ();
// Draw a circle //(250, 450, 350, 550);
//(1f);
//();
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (pdfStamper != null)
();
if (pdfReader != null)
();
}
}
}
For more information about C# related content, please check out the topic of this site:Summary of C# picture operation skills》、《Tutorial on the usage of common C# controls》、《Summary of WinForm control usage》、《C# data structure and algorithm tutorial》、《Introduction to C# object-oriented programming tutorial"and"Summary of thread usage techniques for C# programming》
I hope this article will be helpful to everyone's C# programming.