Aspose.PDF for .NET是一种高PDF处理和解析API，用于在跨平台应用程序中执行文档管理和操作任务。API可以轻松用于生成、修改、转换、渲染、保护和打印PDF文档，而无需使用Adobe Acrobat。此外，API还提供PDF压缩选项，表格创建和操作，图形和图像功能，广泛的超链接功能，印章和水印任务，扩展的安全控制和自定义字体处理。
【下载体验Aspose.PDF for .NET最新版】
在接下来的系列教程中，将为开发者带来Aspose.PDF for .NET的一系列使用教程，例如进行文档间的转换，如何标记PDF文件，如何使用表单和图表等等。
第二章：使用注释
▲第二节：添加，删除和获取注释
在现有PDF文件中添加注释
注释包含在Annotations特定的集合中Page。此集合仅包含该单个页面的注释; 每个页面都有自己的Annotations集合。要向特定页面添加注释，请Annotations使用该Add方法将其添加到该页面的集合中。
- 首先创建要添加到PDF的注释。
- 然后打开输入PDF。
- 将注释添加到Page对象的Annotations集合中。
以下代码段显示如何在PDF页面中添加注释：
//文档目录的路径。
string dataDir = RunExamples.GetDataDir_AsposePdf_Annotations();
//打开文档
Document pdfDocument = new Document(dataDir + "AddAnnotation.pdf");
//创建注释
TextAnnotation textAnnotation = new TextAnnotation(pdfDocument.Pages[1], new Aspose.Pdf.Rectangle(200, 400, 400, 600));
textAnnotation.Title = "Sample Annotation Title";
textAnnotation.Subject = "Sample Subject";
textAnnotation.State = AnnotationState.Accepted;
textAnnotation.Contents = "Sample contents for the annotation";
textAnnotation.Open = true;
textAnnotation.Icon = TextIcon.Key;
Border border = new Border(textAnnotation);
border.Width = 5;
border.Dash = new Dash(1, 1);
textAnnotation.Border = border;
textAnnotation.Rect = new Aspose.Pdf.Rectangle(200, 400, 400, 600);
//在页面的注释集合中添加注释
pdfDocument.Pages[1].Annotations.Add(textAnnotation);
dataDir = dataDir + "AddAnnotation_out.pdf";
//保存输出文件
pdfDocument.Save(dataDir);
●隐形注释
有时，有必要创建在查看时在文档中不可见的水印，但在打印文档时应该可见。为此目的使用注释标志。以下代码段显示了如何操作：
//文档目录的路径。
string dataDir = RunExamples.GetDataDir_AsposePdf_Annotations();
//打开文档。
Document doc = new Document(dataDir + "input.pdf");
FreeTextAnnotation annotation = new FreeTextAnnotation(doc.Pages[1], new Aspose.Pdf.Rectangle(50, 600, 250, 650), new DefaultAppearance("Helvetica", 16, System.Drawing.Color.Red));
annotation.Contents = "ABCDEFG";
annotation.Characteristics.Border = System.Drawing.Color.Red;
annotation.Flags = AnnotationFlags.Print | AnnotationFlags.NoView;
doc.Pages[1].Annotations.Add(annotation);
dataDir = dataDir + "InvisibleAnnotation_out.pdf";
// 保存输出文件
doc.Save(dataDir);
●添加InkAnnotation
InkAnnotation表示由一个或多个不相交点组成的徒手涂鸦。请尝试使用以下代码段在PDF文档中添加InkAnnotation：
//文档目录的路径。
string dataDir = RunExamples.GetDataDir_AsposePdf_Annotations();
Document doc = new Document();
Page pdfPage = doc.Pages.Add();
System.Drawing.Rectangle drect = new System.Drawing.Rectangle();
drect.Height = (int)pdfPage.Rect.Height;
drect.Width = (int)pdfPage.Rect.Width;
drect.X = 0;
drect.Y = 0;
Aspose.Pdf.Rectangle arect = Aspose.Pdf.Rectangle.FromRect(drect);
IListinkList = new List();
Aspose.Pdf.Point[] arrpt = new Aspose.Pdf.Point[3];
inkList.Add(arrpt);
arrpt[0] = new Aspose.Pdf.Point(100, 800);
arrpt[1] = new Aspose.Pdf.Point(200, 800);
arrpt[2] = new Aspose.Pdf.Point(200, 700);
InkAnnotation ia = new InkAnnotation(pdfPage, arect, inkList);
ia.Title = "XXX";
ia.Color = Aspose.Pdf.Color.LightBlue; // (GetColorFromString(stroke.InkColor));
ia.CapStyle = CapStyle.Rounded;
Border border = new Border(ia);
border.Width = 25;
ia.Opacity = 0.5;
pdfPage.Annotations.Add(ia);
dataDir = dataDir + "AddlnkAnnotation_out.pdf";
//保存输出文件
doc.Save(dataDir);
●设置InkAnnotation的线宽
可以使用LineInfo和Border对象更改InkAnnottion的宽度：
//文档目录的路径。
string dataDir = RunExamples.GetDataDir_AsposePdf_Annotations();
Document doc = new Document();
doc.Pages.Add();
IListinkList = new List();
LineInfo lineInfo = new LineInfo();
lineInfo.VerticeCoordinate = new float[] { 55, 55, 70, 70, 70, 90, 150, 60 };
lineInfo.Visibility = true;
lineInfo.LineColor = System.Drawing.Color.Red;
lineInfo.LineWidth = 2;
int length = lineInfo.VerticeCoordinate.Length / 2;
Aspose.Pdf.Point[] gesture = new Aspose.Pdf.Point[length];
for (int i = 0; i < length; i++)
{
gesture[i] = new Aspose.Pdf.Point(lineInfo.VerticeCoordinate[2 * i], lineInfo.VerticeCoordinate[2 * i + 1]);
}
inkList.Add(gesture);
InkAnnotation a1 = new InkAnnotation(doc.Pages[1], new Aspose.Pdf.Rectangle(100, 100, 300, 300), inkList);
a1.Subject = "Test";
a1.Title = "Title";
a1.Color = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Green);
Border border = new Border(a1);
border.Width = 3;
border.Effect = BorderEffect.Cloudy;
border.Dash = new Dash(1, 1);
border.Style = BorderStyle.Solid;
doc.Pages[1].Annotations.Add(a1);
dataDir = dataDir + "lnkAnnotationLineWidth_out.pdf";
//保存输出文件
doc.Save(dataDir);
●添加WatermarkAnnotation
可以在PDF页面的特定位置使用WaterarkAnnotation添加水印文本，也可以使用不透明度属性控制水印的不透明度。请检查以下代码段以添加WatermarkAnnotation：
C＃
//Load a Document
Aspose.PDF.Document doc = new Aspose.PDF.Document("source.pdf");
//Load Page object to add Annotation
Page page = doc.Pages[1];
//Create Annotation
WatermarkAnnotation wa = new WatermarkAnnotation(page, new Aspose.PDF.Rectangle(100, 500, 400, 600));
//Add annotaiton into Annotation collection of Page
page.Annotations.Add(wa);
//Create TextState for Font settings
Aspose.PDF.Text.TextState ts = new Aspose.PDF.Text.TextState();
ts.ForegroundColor = Aspose.PDF.Color.Blue;
ts.Font = FontRepository.FindFont("Times New Roman");
ts.FontSize = 32;
//Set opacity level of Annotaiton Text
wa.Opacity = 0.5;
//Add Text in Annotation
wa.SetTextAndState(new string[] { "HELLO", "Line 1", "Line 2" }, ts);
//Save the Docuemnt
doc.Save("Output.pdf");
●添加RichMediaAnnotation
当您需要在PDF文档中添加外部视频链接时，您可以使用MovieAnnotaiton。但是当需要在PDF文档中嵌入媒体时，您需要使用RichMediaAnnotation。此注释允许将媒体文件嵌入PDF文档中并设置视频/音频播放器，实现为Flash应用程序。由于许可限制，我们不能在产品中包含第三方Flash脚本，因此您应该提供播放视频或音频的脚本。您应该提供Flash应用程序代码。例如，您可以使用随Adobe Acrobat一起分发的videoplayer.swf和audioplayer.swf，可以在Acrobat文件夹的Multimedia Skins / Players子文件夹中找到。其他选择是使用StrobeMediaPLayback.swf播放器或在flash中实现的任何其他视频播放器。
RichMediaAnnotation 可以使用以下类的方法/属性：
- Stream CustomPlayer { set; }：允许设置用于播放视频的播放器。
- string CustomFlashVariables { set; }：允许设置传递给Flash应用程序的变量。该行是“key = value”对的集合，用“＆”分隔;
- void AddCustomData(strig name, Stream data)：为播放器添加其他数据。例如，source = video.mp4＆autoPlay = true＆scale = 100
- ActivationEvent ActivateOn { get; set}：事件激活玩家; 可能的值有Click，PageOpen，PageVisible
- void SetContent(Stream stream, string name)：设置要播放的视频/音频数据
- void Update()：创建注释的数据结构。应该最后调用此方法
- void SetPoster(Stream)：设置视频的海报，即播放器未激活时显示的图片
嵌入视频文件（C#）
string myDir = "C:/Temp/";
Aspose.PDF.Document doc = new Aspose.PDF.Document();
Page page = doc.Pages.Add();
RichMediaAnnotation rma = new RichMediaAnnotation(page, new Aspose.PDF.Rectangle(100,500, 300, 600));
//here we should specify stream containing code of the video player
rma.CustomPlayer = new FileStream(@"C:\Adobe\Acrobat 11.0\Acrobat\MultimediaSkins\Players\Videoplayer.swf",FileMode.Open,FileAccess.Read);
//give name to video data. This data will be embedded into document with this name and referenced from flash variables by this name.
//videoName should not contain path to the file; this is rather "key" to access data inside of the PDF document
string videoName = "VideoTutorial.mp4";
//also we use skin for video player
string skinName = "SkinOverAllNoFullNoCaption.swf";
//compose flash variables line for player. please note that different players may have different format of the flash variables line. Refer to documentation for your player.
rma.CustomFlashVariables = String.Format("source={0}&skin={1}", "VideoTutorial.mp4", skinName);
//add skin code.
rma.AddCustomData(skinName,new FileStream(@"C:\Program Files (x86)\Adobe\Acrobat 11.0\Acrobat\Multimedia Skins\SkinOverAllNoFullNoCaption.swf",FileMode.Open, FileAccess.Read));
//set poster for video
rma.SetPoster(new FileStream(myDir + "barcode.jpg",FileMode.Open, FileAccess.Read));
Stream fs = new FileStream(myDir + videoName, FileMode.Open, FileAccess.Read);
//set video content
rma.SetContent(videoName, fs);
//set type of the content (video)
rma.Type = RichMediaAnnotation.ContentType.Video;
//active player by click
rma.ActivateOn = RichMediaAnnotation.ActivationEvent.Click;
//update annotation data. This method should be called after all assignments/setup. This method initializes data structure of the annotation and embeds required data.
rma.Update();
//add annotation on the page.
page.Annotations.Add(rma);
doc.Save(myDir + "Output.pdf");嵌入音频文件（C#）
Aspose.PDF.Document
doc = new Aspose.PDF.Document();
Page page = doc.Pages.Add();
//give name to audio data. This data will be embedded into document with this name and referenced from flash variables by this name.
string audioName = "test_cbr.mp3";
RichMediaAnnotation rma = new RichMediaAnnotation(page, new Aspose.PDF.Rectangle(100,650, 300, 670));
Stream fs = new FileStream(myDir+audioName, FileMode.Open, FileAccess.Read);
//here we should specify stream containing code of the audio player
rma.CustomPlayer = new FileStream(@"C:\Program Files (x86)\Adobe\Acrobat 11.0\Acrobat\MultimediaSkins\Players\Audioplayer.swf", FileMode.Open,
FileAccess.Read);
//compose flash variables line for player. please note that different players may have different format of the flash variables line. Refer to documentation for your player.
rma.CustomFlashVariables = String.Format("source={0}", "test_cbr.mp3");
//active player on page open event
rma.ActivateOn = RichMediaAnnotation.ActivationEvent.PageOpen;
//set audio content
rma.SetContent(audioName, fs);
//set type of the content (audio)
rma.Type = RichMediaAnnotation.ContentType.Audio;
//update annotation data. This method should be called after all assignments/setup. This method initializes data structure of the annotation and embeds required data.
rma.Update();
//add annotation on the page.
page.Annotations.Add(rma);
doc.Save(myDir+"39606-2.pdf");
-- 未完待续 --
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