如何在将文档加载到文档查看器之前使用Bates Stamp将水印添加到文档中

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本帖最后由 Richard.Ma 于 2017-7-17 09:43 编辑

附件是一个用JS和C＃编写的VS2017项目，允许用户在使用Bates Stamp Annotation加载文档之前对其进行水印：
https://www.leadtools.com/help/l ... /annbatesstamp.html
https://www.leadtools.com/help/l ... sstampcomposer.html

该项目正在使用Document Viewer Demo的DocumentService的修改版本，以及Document Viewer演示中随附的Tutorial1项目的修改版本。

要运行此项目，请从安装中下载并将其解压缩到此文件夹：
C：\ LEADTOOLS 19 \ Examples \ JS \ Documents

运行结果截图

以下是相关代码：

在DocumentsService的FactoryController.cs文件中，我添加了一个新的接口URI的POST方法。该方法将使用URI并创建一个水印图像，并将其保存到文档查看器缓存中，然后将客户端返回给DocumentCache ID，然后将其称为Document Factory的LoadFromCache方法。

服务控制器代码：

[HttpPost]
public string ApplyWatermark(Uri uri)
{
string documentId = "";
using (RasterCodecs codecs = new RasterCodecs())
using (WebClient client = new WebClient())
{
var bytes = client.DownloadData(uri.ToString());
using (MemoryStream ms = new MemoryStream(bytes))
{
ms.Position = 0;
codecs.Options.Load.AllPages = true;
using (RasterImage image = codecs.Load(ms))
using (RasterImage watermarkImage = AddWatermark(image))
{
using (MemoryStream outputStream = new MemoryStream())
{
codecs.Save(watermarkImage, outputStream, RasterImageFormat.RasPdfJpeg411, 24);
var loadOptions = new LoadDocumentOptions()
{
Cache = ServiceHelper.Cache,
CachePolicy = ServiceHelper.CreatePolicy(),
MimeType = "application/pdf"
};
using (var document = DocumentFactory.LoadFromStream(outputStream, loadOptions))
{
document.AutoDeleteFromCache = false;
documentId = document.DocumentId;
document.SaveToCache();
}
}
}
}
}
return documentId;
}

复制代码

以下是使用Bates Stamping将水印应用于RasterImage的每个页面的相关代码：

private RasterImage AddWatermark(RasterImage image)
{
using (AnnBatesStampComposer batesStampComposer = new AnnBatesStampComposer())
{
AnnBatesStampComposer.RenderingEngine = new AnnWinFormsRenderingEngine();
AnnContainer batesStampContainer = new AnnContainer();
batesStampContainer.Mapper.MapResolutions(image.XResolution, image.YResolution, image.XResolution, image.YResolution);
batesStampContainer.Size = batesStampContainer.Mapper.SizeToContainerCoordinates(LeadSizeD.Create(image.Width, image.Height));
using (AnnBatesStamp batesStamp = new AnnBatesStamp())
{
batesStamp.HorizontalAlignment = AnnHorizontalAlignment.Left;
batesStamp.VerticalAlignment = AnnVerticalAlignment.Top;
batesStamp.Logo.Opacity = 0.5;
batesStamp.Logo.Angle = -45;
batesStamp.Logo.StretchLogo = true;
string imageFile = HostingEnvironment.ApplicationPhysicalPath + "Resources\\Images\\watermark.png";
batesStamp.Logo.Picture = new AnnPicture(imageFile);
batesStampComposer.Stamps.Add(batesStamp);
batesStampComposer.TargetContainers.Add(batesStampContainer);
RasterImage watermarkedImage = null;
for (int i = 1; i <= image.PageCount; i++)
{
image.Page = i;
if (watermarkedImage == null)
watermarkedImage = AnnBatesStampComposer.RenderingEngine.RenderOnImage(batesStampContainer, image).Clone();
else
watermarkedImage.AddPage(AnnBatesStampComposer.RenderingEngine.RenderOnImage(batesStampContainer, image).Clone());
}
return watermarkedImage;
}
}
}

复制代码

这里是客户端的Javascript代码与相关的Ajax调用来调用这个方法：

var _this = this;
var documentViewer = null;
window.onload = function () {
var createOptions = new lt.Documents.UI.DocumentViewerCreateOptions();
createOptions.viewCreateOptions.useElements = true;
createOptions.thumbnailsCreateOptions.useElements = true;
createOptions.thumbnailsContainer = document.getElementById("thumbnails");
createOptions.viewContainer = document.getElementById("documentViewer");
_this.documentViewer = lt.Documents.UI.DocumentViewerFactory.createDocumentViewer(createOptions);
_this.documentViewer.commands.run(lt.Documents.UI.DocumentViewerCommands.interactivePanZoom);
_this.documentViewer.view.preferredItemType = lt.Documents.UI.DocumentViewerItemType.svg;
_this.documentViewer.thumbnails.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center;
lt.Documents.DocumentFactory.serviceHost = "http://localhost:19001"; // or wherever your host is
lt.Documents.DocumentFactory.servicePath = ""; // the path to the root of the service, which is nothing for this example
lt.Documents.DocumentFactory.serviceApiPath = "api"; // Routing occurs at "/api", unless you change the routing in the DocumentsService
var url = "http://demo.leadtools.com/images/pdf/leadtools.pdf";
$.ajax({
type: 'POST',
contentType: "application/json; charset=utf-8",
url: "http://localhost:19001/api/Factory/ApplyWatermark?uri=" + url,
success: function (cacheId) {
// Call the "LoadFromUri" and pass success and failure callbacks to the promise
lt.Documents.DocumentFactory.loadFromCache(cacheId)
.done(function (document) {
// Set the document in the viewer
documentViewer.setDocument(document);
});
}
});
};

复制代码

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如何在将文档加载到文档查看器之前使用Bates Stamp将水印添加到文档中

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