PdfiumViewer组件扩展(Pdfium.Net.Free)--添加文本

合集 - PdfiumViewer组件扩展(Pdfium.Net.Free)(16)

1.PdfiumViewer组件扩展(Pdfium.Net.Free)--概述2024-01-042.PdfiumViewer组件扩展(Pdfium.Net.Free)--快速入门2024-01-253.PdfiumViewer组件扩展(Pdfium.Net.Free)--PDF预览器框选2024-01-254.PdfiumViewer组件扩展(Pdfium.Net.Free)--打开大文件处理2024-01-255.PdfiumViewer组件扩展(Pdfium.Net.Free)--加载字体2024-01-296.PdfiumViewer组件扩展(Pdfium.Net.Free)--创建字符子集2024-01-29

7.PdfiumViewer组件扩展(Pdfium.Net.Free)--添加文本2024-01-29

8.PdfiumViewer组件扩展(Pdfium.Net.Free)--添加图片2024-01-309.PdfiumViewer组件扩展(Pdfium.Net.Free)--添加水印2024-02-0210.PdfiumViewer组件扩展(Pdfium.Net.Free)--删除或编辑pdf内容2024-01-3111.PdfiumViewer组件扩展(Pdfium.Net.Free)--PDF操作2024-02-0212.PdfiumViewer组件扩展(Pdfium.Net.Free)--签名2024-01-3113.PdfiumViewer组件扩展(Pdfium.Net.Free)--注解2024-01-3114.PdfiumViewer组件扩展(Pdfium.Net.Free)--可视化编辑pdf2024-04-0715.什么是转换矩阵以及如何使用它2024-02-2416.Pdfium.Net.Free 添加 bblanchon.PDFium nuget方式02-11

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项目地址：

Pdfium.Net：https://github.com/1000374/Pdfium.Net.Free

PdfiumViewer：https://github.com/1000374/PdfiumViewer

Pdfium.Net.Free 支持

• .NETFramework 4.0

• .NETFramework 4.5

• .NETStandard 2.0

• .Net8.0

可以和PdfiumViewer.Free共同使用预览、编辑pdf，也可以直接引用Pdfium.Net.Free 操作pdf，Pdfium.Net.Free封装了现有Pdfium的函数，实现了部分操作pdf的功能，部分功能等待后续~~

Pdfium.Net 添加文本有3个重载 可对添加的文字设置x、y坐标、字体大小、颜色、x、y缩放比例、旋转、裁切、混合模式、渲染模式（根据此设置镂空样式

FpdfTextRenderMode.STROKE_CLIP）、镂空填充色、镂空颜色。当strokeColor为null时 取fillColor

1.当前重载使用pdf标准字库添加文字（中文会乱码）

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/// <summary>     /// Add text object using one of the standard PDF fonts.  Chinese maybe garbled characters     /// </summary>     /// <param name="text"></param>     /// <param name="posX"></param>     /// <param name="posY"></param>     /// <param name="font_size">the font size for the new text object.</param>     /// <param name="fillColor"></param>     /// <param name="fontName"><see cref="Native.Enums.StandardPDFFonts"/></param>     /// <param name="scalex"></param>     /// <param name="scaley"></param>     /// <param name="rotate"></param>     /// <param name="shear"></param>     /// <param name="blend">Blend mode can be one of following: Color, ColorBurn, ColorDodge, Darken,Difference, Exclusion, HardLight, Hue, Lighten, Luminosity, Multiply, Normal,Overlay, Saturation, Screen, SoftLight.<see cref="BlendMode"/></param>     /// <param name="render_mode">render_mode<see cref="FpdfTextRenderMode"/></param>     /// <param name="strokeColor">stroke Color render_mode </param>     /// <param name="strokeWidth">stroke Width</param>     /// <returns></returns>     public bool AddString(string text, int posX, int posY, float font_size, Color fillColor, string fontName, float scalex = 1f, float scaley = 1, float rotate = 0, float shear = 0, string blend = BlendMode.Darken, FpdfTextRenderMode render_mode = FpdfTextRenderMode.FILL, Color? strokeColor = null, float strokeWidth = 0.2f)

 

调用示例：

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using (var doc = PdfDocument.CreateNew()) {     var cSharpString = "!you ok 这是第一句。 这是第二行。a you ok";     var page = doc.Pages.Add(612, 792);     page.AddString(cSharpString, 10, 50, 12, Color.Black, StandardPDFFonts.TimesNewRoman);     doc.Save("./Pdfium.NetTests/AddString1.pdf"); }

　　

2.当前重载使用获取的PdfFont 对象添加文字，详情请参照

Pdfium.Net.Free 一个免费的Pdfium的 .net包装器--加载字体 

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/// <summary>   /// add Text with add <see cref="FpdfFontT"/>   /// </summary>   /// <param name="pageNumber"></param>   /// <param name="text"></param>   /// <param name="posX"></param>   /// <param name="posY"></param>   /// <param name="font_size"></param>   /// <param name="fillColor"></param>   /// <param name="font"></param>   /// <param name="scalex"></param>   /// <param name="scaley"></param>   /// <param name="rotate"></param>   /// <param name="shear"></param>   /// <param name="blend">Blend mode can be one of following: Color, ColorBurn, ColorDodge, Darken,Difference, Exclusion, HardLight, Hue, Lighten, Luminosity, Multiply, Normal,Overlay, Saturation, Screen, SoftLight.<see cref="BlendMode"/></param>   /// <param name="render_mode">render_mode<see cref="FpdfTextRenderMode"/></param>   /// <param name="strokeColor">stroke Color render_mode </param>   /// <param name="strokeWidth">stroke Width</param>   /// <returns></returns>   public bool AddString(string text, float posX, float posY, float font_size, Color fillColor, PdfFont font, float scalex = 1f, float scaley = 1, float rotate = 0, float shear = 0, string blend = BlendMode.Darken, FpdfTextRenderMode render_mode = FpdfTextRenderMode.FILL, Color? strokeColor = null, float strokeWidth = 0.2f)

　

调用示例（从pdf中获取字体后写入）：

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var pathPdf = "./Pdfium.NetTests/resources/fontText.pdf"; using (var doc = PdfDocument.Load(new MemoryStream(File.ReadAllBytes(pathPdf)))) {     var font = doc.Pages[0].GetTextObjFont("你", out float size);     if (!font.IsNull)     {         var emb = font.IsEmbedded;         var cSharpString = "你好啊,abc";         var page = doc.Pages[0];         page.AddString(cSharpString, 10, 50, size, Color.Black, font);         doc.Save("./Pdfium.NetTests/TextObjFont.pdf");     } }

　　

3.当前重载需提前调用

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1	public void LoadFont(string fontPath, bool isSubSet = false, string words = null, FpdfFontTypes fontTypes = FpdfFontTypes.TrueType)

　　

方法，且只能调用一次，否则抛出找不到字体对象，或者pdf会多次加载字体导致pdf很大，也就是每次调用都会往doc中加载一次字库。

可创建子集后加载字库，以减少pdf大小，具体参照

Pdfium.Net.Free 一个免费的Pdfium的 .net包装器--创建字符子集 

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/// <summary>  /// add Text with add <see cref="FpdfFontT"/>  /// </summary>  /// <param name="text"></param>  /// <param name="posX"></param>  /// <param name="posY"></param>  /// <param name="font_size">the font size for the new text object.</param>  /// <param name="fillColor">the font color.</param>  /// <param name="isSubSet">ttf path use File.ReadAllBytes(fontPath);</param>  /// <param name="scalex">scale x</param>  /// <param name="scaley">scale y</param>  /// <param name="rotate">rotate</param>  /// <param name="shear">shear</param>  /// <param name="blend">Blend mode can be one of following: Color, ColorBurn, ColorDodge, Darken,Difference, Exclusion, HardLight, Hue, Lighten, Luminosity, Multiply, Normal,Overlay, Saturation, Screen, SoftLight.<see cref="BlendMode"/></param>  /// <param name="render_mode">render_mode<see cref="FpdfTextRenderMode"/></param>  /// <param name="strokeColor">stroke Color render_mode </param>  /// <param name="strokeWidth">stroke Width</param>  /// <returns></returns>  public bool AddString(string text, float posX, float posY, float font_size, Color fillColor, float scalex = 1f, float scaley = 1, float rotate = 0, float shear = 0,  string blend = BlendMode.Darken, FpdfTextRenderMode render_mode = FpdfTextRenderMode.FILL, Color? strokeColor = null, float strokeWidth = 0.2f)

　

调用字符集全部加载示例：

　

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using (var doc = PdfDocument.CreateNew()) {     var fontPath = @"c:\Windows\fonts\simhei.ttf";     doc.LoadFont(fontPath);     var cSharpString = "!you ok 这是第一句。 这是第二行。a you ok";     var page = doc.Pages.Add(612, 792);     page.AddString(cSharpString, 10, 50, 12, Color.Black);     doc.Save("./Pdfium.NetTests/AddString.pdf"); }

　　

创建字符子集加载示例：

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using (var doc = PdfDocument.CreateNew()) {     var fontPath = @"c:\Windows\fonts\simhei.ttf";       var cSharpString = "!you ok 这是第一句。";     var cSharpString2 = " 这是第二行。a you ok 你好 abcdefghijklmnopqrstuvwxyz1234567890-*/+~`@#$%^&*(){}[];:'|?,，。.！!";     doc.LoadFont(fontPath, true, cSharpString + cSharpString2);     var page = doc.Pages.Add(612, 792);     page.AddString(cSharpString, 10, 50, 12, Color.Black);       page.AddString(cSharpString2, 10, 80, 12, Color.Black);     doc.Save("./Pdfium.NetTests/AddString3.pdf"); }