c# - 将网页图片添加到 pdf

Question

我正在尝试使用 iTextSharp 将网络图像添加到 pdf

我正在尝试使用您用于本地镜像的相同代码

using (var pdfDoc = new Document()) 
using (var pdfWriter = PdfWriter.GetInstance(pdfDoc, pdfStream)) { 
    pdfDoc.Open();
    Image tif = Image.GetInstance("www.myimage.com");
    pdfDoc.Add(tif);
    pdfDoc.Close();
}

Answer 1

您必须先发出 http 网络请求才能下载图像。

public Image DownloadImageFromURL(string url)
{
   HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(filename);
   httpWebRequest.AllowWriteStreamBuffering = true;            
   httpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)";            
   httpWebRequest.Timeout = 30000; //30 seconds
   webResponse = httpWebRequest.GetResponse();    
   webStream = webResponse.GetResponseStream();
   Image downloadImage = Image.FromStream(webStream);            
   webResponse.Close();   
   return downloadImage;
}

//in your code
    using (var pdfDoc = new Document()) 
using (var pdfWriter = PdfWriter.GetInstance(pdfDoc, pdfStream)) { 
    pdfDoc.Open();
    Image tif = DownloadImageFromURL("www.myimage.com");
    pdfDoc.Add(tif);
    pdfDoc.Close();
}

使用此方法发出 HttpWebRequest 并下载图像。现在把它写成 pdf。