Question

我尝试将PNG图像下载到文件中，但我是通过公司网络代理进行的。我发现这个bit of code下载了PNG图像。这是代码：

using (WebClient webClient = new WebClient()) 
{
    byte [] data = webClient.DownloadData("https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/v/t34.0-12/10555140_10201501435212873_1318258071_n.jpg?oh=97ebc03895b7acee9aebbde7d6b002bf&oe=53C9ABB0&__gda__=1405685729_110e04e71d9");

   using (MemoryStream mem = new MemoryStream(data)) 
   {
       using (var yourImage = Image.FromStream(mem)) 
       { 
          // If you want it as Png
           yourImage.Save("path_to_your_file.png", ImageFormat.Png) ; 
       }
   } 

}

我使用这段代码来通过代理，但我不确定如何合并上面提到的代码来下载图片：

HttpClientHandler clientHandler = new HttpClientHandler();
clientHandler.Proxy = new WebProxy(PROXY_URL, true);
clientHandler.Proxy.Credentials = new NetworkCredential(PROXY_UID, PROXY_PWD, PROXY_DMN);
var client = new HttpClient(clientHandler);
var result = client.GetStreamAsync(url).Result;

我想我已经接近了。我需要做些什么来完成这项工作？

Answer 1

尝试：

HttpClientHandler clientHandler = new HttpClientHandler();
clientHandler.Proxy = new WebProxy(PROXY_URL, true);
clientHandler.Proxy.Credentials = new NetworkCredential(PROXY_UID, PROXY_PWD, PROXY_DMN);
var client = new HttpClient(clientHandler);
var stream = client.GetStreamAsync(url).Result;
using (var yourImage = Image.FromStream(stream)) 
{ 
  // If you want it as Png
   yourImage.Save("path_to_your_file.png", ImageFormat.Png) ; 
}

Answer 2

using语句中的WebClient对象也具有Proxy属性。您只需要在using语句中直接包含这些行：

webClient.Proxy = new WebProxy(PROXY_URL, true);
webClient.Proxy.Credentials = new NetworkCredential(PROXY_UID, PROXY_PWD, PROXY_DMN);

请注意，我还没有尝试过此代码。只是做一个观察。

Answer 3

.net Framework允许PictureBox控件从URL加载图像

所以只需在图片框中加载图片

并在Laod Complete Event中保存图像

pictureBox1.ImageLocation = "PROXY_URL;

void pictureBox1_LoadCompleted(object sender, AsyncCompletedEventArgs e)
    {
   pictureBox1.Image.Save(destination);
}

如何使用C＃通过代理从URL下载图像？

3 个答案: