PDF操作：
- 旋转
- 删除
- 合并
- 拆分
- 转成图片
- 导出内嵌资源图片
- 两页合并成一页
- 添加、去除密码
- 添加水印
PDF旋转某一页
var document = pdfViewer1.Document; int page = pdfViewer1.Renderer.Page;
//判断pdf旋转方向 var rotate = (int)document.GetRotation(page); if (rotate < 3) rotate++; else rotate = 0; pdfViewer1.Document = null;
//向下一个方向旋转 document.RotatePage(page, (PdfRotation)rotate); var memoryStream = new MemoryStream(); document.Save(memoryStream); pdfViewer1.Document = PdfDocument.Load(this, memoryStream); pdfViewer1.Renderer.Page = page;
//如需要保存
//document.Save(路径);
PDF删除某一页
int page = pdfViewer1.Renderer.Page; pdfViewer1.Document.DeletePage(page);
pdf合并 如需保存请直接保存文件
var file = "";
using (var form = new OpenFileDialog())
{
form.Filter = "PDF Files (*.pdf)|*.pdf|All Files (*.*)|*.*";
form.RestoreDirectory = true;
form.Title = "Open PDF File";
if (form.ShowDialog(this) != DialogResult.OK)
{
Dispose();
return;
}
file = form.FileName;
}
var document = pdfViewer1.Document;
var doc = PdfSupport.MergePDF(document, OpenDocument(file));
{
if (doc != null)
{
pdfViewer1.Document = null;
pdfViewer1.Document = doc;
}
}
//打开pdf
private PdfDocument OpenDocument(string fileName)
{
try
{ // Remove ReadOnly attribute from the copy.
File.SetAttributes(fileName, File.GetAttributes(fileName) & ~FileAttributes.ReadOnly);
return PdfDocument.Load(this, new MemoryStream(File.ReadAllBytes(fileName)));
}
catch (Exception ex)
{
MessageBox.Show(this, ex.Message, Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
return null;
}
}
拆分PDF，拆分PDF支持指定拆分
var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
var document = pdfViewer1.Document;
{
for (int i = 0; i < document.PageCount; i++)
{
var filePath = Path.Combine(path, $"{i}.pdf");
///eg. "1,1,1,1" 4个1页
/// "1-3" 第1页到第3页
/// "1,3" 第1页、第3页
using (var doc = PdfSupport.GetPDFPage(document, i + 1))
{
doc.Save(filePath);
}
}
}
PDF转成图片
var document = pdfViewer1.Document;
var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
var dpiX = 96 * 2;
var dpiY = 96 * 2;
for (int i = 0; i < document.PageCount; i++)
{
using (var image = document.Render(i, (int)document.PageSizes[i].Width * 4 / 3, (int)document.PageSizes[i].Height * 4 / 3, dpiX, dpiY, PdfRotation.Rotate0, PdfRenderFlags.Annotations | PdfRenderFlags.CorrectFromDpi))
{
image.Save(Path.Combine(path, i + ".png"));
}
}
导出PDF内嵌资源
var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
using (var memoryStream = new MemoryStream())
{
pdfViewer1.Document.Save(memoryStream);
var document = PdfReader.Open(memoryStream);
var imageCount = 0;
// Iterate the pages.
foreach (var page in document.Pages)
{
// Get the resources dictionary.
var resources = page.Elements.GetDictionary("/Resources");
if (resources == null)
continue;
// Get the external objects dictionary.
var xObjects = resources.Elements.GetDictionary("/XObject");
if (xObjects == null)
continue;
var items = xObjects.Elements.Values;
// Iterate the references to external objects.
foreach (var item in items)
{
var reference = item as PdfReference;
if (reference == null)
continue;
var xObject = reference.Value as PdfDictionary;
// Is external object an image?
if (xObject != null && xObject.Elements.GetString("/Subtype") == "/Image")
{
PDFHelper.ExportImage(xObject, path, ref imageCount);
}
}
}
}
两页合并成一页
using (var stream = new MemoryStream())
{
pdfViewer1.Document.Save(stream);
stream.Position = 0;
// Create the output document.
var outputDocument = new PdfSharp.Pdf.PdfDocument();
var outputmemoryStream = new MemoryStream();
// Show single pages.
// (Note: one page contains two pages from the source document)
outputDocument.PageLayout = PdfPageLayout.SinglePage;
var font = new XFont("微软雅黑", 8, XFontStyle.Regular);
var format = new XStringFormat();
format.Alignment = XStringAlignment.Center;
format.LineAlignment = XLineAlignment.Far;
// Open the external document as XPdfForm object.
var form = XPdfForm.FromStream(stream);
for (var idx = 0; idx < form.PageCount; idx += 2)
{
// Add a new page to the output document.
var page = outputDocument.AddPage();
page.Orientation = PageOrientation.Landscape;
double width = page.Width;
double height = page.Height;
var gfx = XGraphics.FromPdfPage(page);
// Set the page number (which is one-based).
form.PageNumber = idx + 1;
var box = new XRect(0, 0, width / 2, height);
// Draw the page identified by the page number like an image.
gfx.DrawImage(form, box);
// Write page number on each page.
box.Inflate(0, -10);
gfx.DrawString(String.Format("- {0} -", idx + 1),
font, XBrushes.Red, box, format);
if (idx + 1 >= form.PageCount)
continue;
// Set the page number (which is one-based).
form.PageNumber = idx + 2;
box = new XRect(width / 2, 0, width / 2, height);
// Draw the page identified by the page number like an image.
gfx.DrawImage(form, box);
// Write page number on each page.
box.Inflate(0, -10);
gfx.DrawString(String.Format("- {0} -", idx + 2),
font, XBrushes.Red, box, format);
}
outputDocument.Save(outputmemoryStream);
pdfViewer1.Document = null;
pdfViewer1.Document = PdfDocument.Load(this, outputmemoryStream);
}
添加、去除密码
//添加密码
using (var form = new PasswordForm())
{
if (form.ShowDialog(this) == DialogResult.OK)
{
var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
var txt = form.Password;
using (var stream = new MemoryStream())
{
pdfViewer1.Document.Save(stream);
stream.Position = 0;
// Open an existing document. Providing an unrequired password is ignored.
var document = PdfReader.Open(stream);
var securitySettings = document.SecuritySettings;
// Setting one of the passwords automatically sets the security level to
// PdfDocumentSecurityLevel.Encrypted128Bit.
securitySettings.UserPassword = txt;
//securitySettings.OwnerPassword = "owner";
// Don't use 40 bit encryption unless needed for compatibility.
//securitySettings.DocumentSecurityLevel = PdfDocumentSecurityLevel.Encrypted40Bit;
// Restrict some rights.
securitySettings.PermitAccessibilityExtractContent = false;
securitySettings.PermitAnnotations = false;
securitySettings.PermitAssembleDocument = false;
securitySettings.PermitExtractContent = false;
securitySettings.PermitFormsFill = true;
securitySettings.PermitFullQualityPrint = false;
securitySettings.PermitModifyDocument = true;
securitySettings.PermitPrint = false;
// Save the document...
document.Save(Path.Combine(path, Path.GetFileName(fileName)));
}
}
}
//去除密码
using (var form = new PasswordForm())
{
if (form.ShowDialog(this) == DialogResult.OK)
{
var path = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
var txt = form.Password;
using (var stream = new MemoryStream())
{
pdfViewer1.Document.Save(stream);
stream.Position = 0;
// Open an existing document. Providing an unrequired password is ignored.
var document = PdfReader.Open(stream, txt, PdfDocumentOpenMode.Modify);
document.SecuritySettings.DocumentSecurityLevel = PdfSharp.Pdf.Security.PdfDocumentSecurityLevel.None;
document.Save(Path.Combine(path, Path.GetFileName(fileName)));
}
}
}
添加水印
using (var stream = new MemoryStream())
{
pdfViewer1.Document.Save(stream);
stream.Position = 0;
var font = new XFont("微软雅黑", fontsize, XFontStyle.Regular, XPdfFontOptions.UnicodeDefault);
var document = PdfReader.Open(stream);
// Set version to PDF 1.4 (Acrobat 5) because we use transparency.
if (document.Version < 14)
document.Version = 14;
for (var idx = 0; idx < document.Pages.Count; idx++)
{
var page = document.Pages[idx];
var gfx = XGraphics.FromPdfPage(page);
var size = gfx.MeasureString(watermark, font);
gfx.TranslateTransform(page.Width / 2, page.Height / 2);
gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI);
gfx.TranslateTransform(-page.Width / 2, -page.Height / 2);
if (waterIndex == 0)
{
var format = new XStringFormat();
format.Alignment = XStringAlignment.Near;
format.LineAlignment = XLineAlignment.Near;
XBrush brush = new XSolidBrush(XColor.FromArgb(color));
gfx.DrawString(watermark, font, brush,
new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),
format);
}
else if (waterIndex == 1)
{
var path = new XGraphicsPath();
var format = new XStringFormat();
format.Alignment = XStringAlignment.Near;
format.LineAlignment = XLineAlignment.Near;
path.AddString(watermark, font.FontFamily, XFontStyle.BoldItalic, fontsize,
new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),
format);
var pen = new XPen(XColor.FromArgb(color), 2);
gfx.DrawPath(pen, path);
}
if (waterIndex == 2)
{
var path = new XGraphicsPath();
var format = new XStringFormat();
format.Alignment = XStringAlignment.Near;
format.LineAlignment = XLineAlignment.Near;
path.AddString(watermark, font.FontFamily, XFontStyle.BoldItalic, fontsize,
new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),
format);
var pen = new XPen(XColor.FromArgb(50, 75, 0, 130), 3);
XBrush brush = new XSolidBrush(XColor.FromArgb(color));
gfx.DrawPath(pen, brush, path);
}
}
var outputmemoryStream = new MemoryStream();
document.Save(outputmemoryStream);
pdfViewer1.Document = null;
pdfViewer1.Document = PdfDocument.Load(this, outputmemoryStream);
}
阿里云下载：https://www.aliyundrive.com/s/o4KTpMLQyU9
具体使用方法请仓库自取
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源码地址