在GRAPHIC_AND_DESCRIPTION模式C#.net中添加数字签名时，在Itextsharp中调整图像的宽度 [英] Adjust width for image in Itextsharp while adding digital signature in GRAPHIC_AND_DESCRIPTION mode C# .net
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问题描述
我想在使用itextsharp库C#对pdf签名时调整添加的图像的宽度以及说明.
我下面的代码与设置图像和签名中的破损有关:
var pdfStamper = PdfStamper.CreateSignature(reader, os, '\0', null, true);
var signatureAppearance = pdfStamper.SignatureAppearance;
var imageData = Path.Combine(_env.WebRootPath, ImagePathere);
var image = Image.GetInstance(imageData);
signatureAppearance.SignatureGraphic = image;
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252,
BaseFont.NOT_EMBEDDED);
signatureAppearance.Layer2Font =new iTextSharp.text.Font(bf, 7, iTextSharp.text.Font.NORMAL);
signatureAppearance.SignatureRenderingMode =
PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;
signatureAppearance.Layer4Text = PdfSignatureAppearance.questionMark;
signatureAppearance.Acro6Layers = false;
signatureAppearance.Layer2Text = "Digitally Signed by CN= Random User Name\n(Randomuseremail@email.com) \nDate: 11-05-2020 16:06 IST\nLocation: Some city ,Some location, India \nReason: Add tamper proof layer on platform";
最终结果在pdf上看起来像这样:
请帮助我在数字签名中调整图像大小，以使描述部分更大，符号更小，还希望删除签名有效文本，但绿色刻度线应保留.
编辑
我浏览了该链接，但根据我的理解，我已将代码更新为以下内容，但它在最终签名的pdf中提供了空的签名矩形，并且未包含"pdfStamper.AddDirectTemplateSimple(t，new PdfName("n2")) );因为它给了错误.新生成的pdf: https://takeafile.com/?f=gexatugotu
var imageData = Path.Combine(_env.WebRootPath, ImagePathere);
var image = Image.GetInstance(imageData);
signatureAppearance.SignatureGraphic = image;
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252,
BaseFont.NOT_EMBEDDED);
var layer2Font = new iTextSharp.text.Font(bf, 7, iTextSharp.text.Font.NORMAL);
signatureAppearance.Layer2Font = layer2Font;
signatureAppearance.SignatureRenderingMode =
PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;
var t = signatureAppearance.GetLayer(2);
signatureAppearance.Layer2Text = "Digitally Signed by CN= Random User Name\n(Randomuseremail@email.com) \nDate: 11-05-2020 16:06 IST\nLocation: Some city ,Some location, India \nReason: Add tamper proof layer on platform";
t.BoundingBox = rect;
if (image != null)
{
t.AddImage(image, rect.Width, 0, 0, rect.Height, 0, 0);
}
Font font;
if (layer2Font == null)
font = new Font();
else
font = new Font(layer2Font);
float size = font.Size;
Rectangle dataRect = null;
Rectangle signatureRect = null;
float MARGIN = 2;
// origin is the bottom-left
signatureRect = new Rectangle(
MARGIN,
MARGIN,
rect.Width / 2 - MARGIN,
rect.Height - MARGIN);
dataRect = new Rectangle(
rect.Width / 2 + MARGIN / 2,
MARGIN,
rect.Width - MARGIN / 2,
rect.Height - MARGIN);
if (rect.Height > rect.Width)
{
signatureRect = new Rectangle(
MARGIN,
rect.Height / 2,
rect.Width - MARGIN,
rect.Height);
dataRect = new Rectangle(
MARGIN,
MARGIN,
rect.Width - MARGIN,
rect.Height / 2 - MARGIN);
}
// for (renderingMode == RenderingMode.GRAPHIC_AND_DESCRIPTION)
{
int runDirection = PdfWriter.RUN_DIRECTION_NO_BIDI;
ColumnText ct2 = new ColumnText(t);
ct2.RunDirection = runDirection;
ct2.SetSimpleColumn(signatureRect.Left, signatureRect.Bottom, signatureRect.Right, signatureRect.Top, 0, Element.ALIGN_RIGHT);
Image im = Image.GetInstance(image);
im.ScaleToFit(signatureRect.Width, signatureRect.Height);
Paragraph p = new Paragraph();
// must calculate the point to draw from to make image appear in middle of column
float x = 0;
// experimentation found this magic number to counteract Adobe's signature graphic, which
// offsets the y co-ordinate by 15 units
float y = -im.ScaledHeight + 15;
x = x + (signatureRect.Width - im.ScaledWidth) / 2;
y = y - (signatureRect.Height - im.ScaledHeight) / 2;
p.Add(new Chunk(im, x + (signatureRect.Width - im.ScaledWidth) / 2, y, false));
ct2.AddElement(p);
ct2.Go();
}
如果我理解错误，请引导我，请提供解决方案.
解决方案
而不是使用以下签名模式:
PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;
我切换到下面，并创建了想要的图像外观.
PdfSignatureAppearance.RenderingMode.GRAPHIC;
I want to adjust width of added Image along with description while signing pdf using itextsharp library C#.
My code below regarding setting image and descreption in signature:
var pdfStamper = PdfStamper.CreateSignature(reader, os, '\0', null, true);
var signatureAppearance = pdfStamper.SignatureAppearance;
var imageData = Path.Combine(_env.WebRootPath, ImagePathere);
var image = Image.GetInstance(imageData);
signatureAppearance.SignatureGraphic = image;
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252,
BaseFont.NOT_EMBEDDED);
signatureAppearance.Layer2Font =new iTextSharp.text.Font(bf, 7, iTextSharp.text.Font.NORMAL);
signatureAppearance.SignatureRenderingMode =
PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;
signatureAppearance.Layer4Text = PdfSignatureAppearance.questionMark;
signatureAppearance.Acro6Layers = false;
signatureAppearance.Layer2Text = "Digitally Signed by CN= Random User Name\n(Randomuseremail@email.com) \nDate: 11-05-2020 16:06 IST\nLocation: Some city ,Some location, India \nReason: Add tamper proof layer on platform";
End result of this looks like this on pdf :
Please help me in doing resize image in digital signature make description part bigger and symbol smaller, also want to remove signature valid text but green tick should stay.
EDIT
I went through the link but I have updated my code to below as per my understanding but it is giving empty signature rectangle in end signed pdf and I did not include "pdfStamper.AddDirectTemplateSimple(t, new PdfName("n2"));" as it was giving error. New generated pdf: https://takeafile.com/?f=gexatugotu
var imageData = Path.Combine(_env.WebRootPath, ImagePathere);
var image = Image.GetInstance(imageData);
signatureAppearance.SignatureGraphic = image;
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252,
BaseFont.NOT_EMBEDDED);
var layer2Font = new iTextSharp.text.Font(bf, 7, iTextSharp.text.Font.NORMAL);
signatureAppearance.Layer2Font = layer2Font;
signatureAppearance.SignatureRenderingMode =
PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;
var t = signatureAppearance.GetLayer(2);
signatureAppearance.Layer2Text = "Digitally Signed by CN= Random User Name\n(Randomuseremail@email.com) \nDate: 11-05-2020 16:06 IST\nLocation: Some city ,Some location, India \nReason: Add tamper proof layer on platform";
t.BoundingBox = rect;
if (image != null)
{
t.AddImage(image, rect.Width, 0, 0, rect.Height, 0, 0);
}
Font font;
if (layer2Font == null)
font = new Font();
else
font = new Font(layer2Font);
float size = font.Size;
Rectangle dataRect = null;
Rectangle signatureRect = null;
float MARGIN = 2;
// origin is the bottom-left
signatureRect = new Rectangle(
MARGIN,
MARGIN,
rect.Width / 2 - MARGIN,
rect.Height - MARGIN);
dataRect = new Rectangle(
rect.Width / 2 + MARGIN / 2,
MARGIN,
rect.Width - MARGIN / 2,
rect.Height - MARGIN);
if (rect.Height > rect.Width)
{
signatureRect = new Rectangle(
MARGIN,
rect.Height / 2,
rect.Width - MARGIN,
rect.Height);
dataRect = new Rectangle(
MARGIN,
MARGIN,
rect.Width - MARGIN,
rect.Height / 2 - MARGIN);
}
// for (renderingMode == RenderingMode.GRAPHIC_AND_DESCRIPTION)
{
int runDirection = PdfWriter.RUN_DIRECTION_NO_BIDI;
ColumnText ct2 = new ColumnText(t);
ct2.RunDirection = runDirection;
ct2.SetSimpleColumn(signatureRect.Left, signatureRect.Bottom, signatureRect.Right, signatureRect.Top, 0, Element.ALIGN_RIGHT);
Image im = Image.GetInstance(image);
im.ScaleToFit(signatureRect.Width, signatureRect.Height);
Paragraph p = new Paragraph();
// must calculate the point to draw from to make image appear in middle of column
float x = 0;
// experimentation found this magic number to counteract Adobe's signature graphic, which
// offsets the y co-ordinate by 15 units
float y = -im.ScaledHeight + 15;
x = x + (signatureRect.Width - im.ScaledWidth) / 2;
y = y - (signatureRect.Height - im.ScaledHeight) / 2;
p.Add(new Chunk(im, x + (signatureRect.Width - im.ScaledWidth) / 2, y, false));
ct2.AddElement(p);
ct2.Go();
}
Kindly guide me if I have understood something wrong and please provide solution.
解决方案
Instead of using below signature mode:
PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;
I switched to below and created the appearance I want with image.
PdfSignatureAppearance.RenderingMode.GRAPHIC;
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