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如何使用 Cloud .NET SDK 处理 PDF 文档中的页面
为了通过 Cloud .NET SDK 操作 PDF 文档中的页面，我们将使用 Aspose.PDF Cloud .NET SDK 这个 Cloud SDK 允许您轻松构建基于云的 PDF 创建、编辑和转换应用程序，适用于 C#、ASP.NET 或其他 .NET 语言的各种云平台。打开 NuGet 包管理器，搜索 Aspose.PDF Cloud 并安装。您还可以使用包管理器控制台中的以下命令。
包管理器控制台命令
PM> Install-Package Aspose.Pdf-Cloud
使用 .NET SDK 向页面添加图像印章的步骤
Aspose.PDF Cloud 开发人员可以轻松地加载和附加图像印章到 PDF 文档的页面，只需几行代码。
- 使用您的应用程序密钥和密钥创建一个新的配置对象。
- 创建一个对象以连接到云 API。
- 将 PDF 上传到云存储。
- 上传图像文件到云存储。
- 使用您的设置创建一个ImageStamp对象。
- 在云存储中将ImageStamp对象附加到PDF的页面。
- 检查响应并记录结果。
- 下载更新的文件以供本地使用。
此示例代码展示了如何在PDF文档的页面上添加图像印章
using Aspose.Pdf.Cloud.Sdk.Model;
namespace Pages
{
public class PagesAddImageStamp
{
public static async Task Append(string documentName, string outputName, int pageNumber, string imageFileName, float width, float height, string remoteFolder)
{
// Get your AppSid and AppSecret from https://dashboard.aspose.cloud (free registration required).
pdfApi = new PdfApi(AppSecret, AppSid);
using (var file = File.OpenRead(Path.Combine(localFolder, documentName)))
{ // Upload the local PDF to cloud storage folder name.
FilesUploadResult uploadResponse = await pdfApi.UploadFileAsync(Path.Combine(remoteFolder, documentName), documentName);
Console.WriteLine(uploadResponse.Uploaded[0]);
}
using (var file = File.OpenRead(Path.Combine(localFolder, imageFileName)))
{ // Upload the local image file to cloud storage folder name.
FilesUploadResult uploadImageResponse = await pdfApi.UploadFileAsync(Path.Combine(remoteFolder, imageFileName), imageFileName);
Console.WriteLine(uploadImageResponse.Uploaded[0]);
}
ImageStamp stamp = new ImageStamp(
Background: true,
HorizontalAlignment: HorizontalAlignment.Center,
VerticalAlignment: VerticalAlignment.Top,
Opacity: 0.3,
Rotate: Rotation.None,
RotateAngle: 45,
Width: width,
Height: height,
Zoom: 1,
FileName: Path.Combine(remoteFolder, imageFileName));
// Append new image stamp to page of the PDF on cloud storage.
AsposeResponse response = await pdfApi.PostPageImageStampsAsync(documentName, pageNumber, new List<ImageStamp> { stamp }, folder: remoteFolder);
// Checks the response and logs the result.
if (response == null)
Console.WriteLine("PagesAddImageStamp(): Unexpected error!");
else if (response.Code < 200 || response.Code > 299)
Console.WriteLine("PagesAddImageStamp(): Failed to append image stamp to the page of document.");
else
{ // Downloads the updated file for local use.
Console.WriteLine("PagesAddImageStamp(): image '{0}' appended as stamp to the page '{1}' of the document '{2}.", imageFileName, pageNumber, documentName);
Stream stream = pdfApi.DownloadFile(Path.Combine(remoteFolder, documentName));
using var fileStream = File.Create(Path.Combine(localFolder, "add_page_image_stamp_" + outputName));
stream.Position = 0;
await stream.CopyToAsync(fileStream);
Console.WriteLine("PagesAddImageStamp(): File '{0}' successfully downloaded.", "add_page_image_stamp_" + outputName);
}
}
}
}