使用绝对URL将图像渲染为响应 [英] Rendering image as response using absolute url

问题描述

我试图使用图片的绝对网址将图片作为网站的回复。我尝试下面的代码。响应正在显示，但图像不可见。我想这里发生了简单的错误。请帮帮我。



我的尝试：

im trying to get a image as response from a website using image's absolute url. i tried below code. response is showing but not the image is visible. i think here simple mistake is happened. please help me here.

What I have tried:

// Creates an HttpWebRequest with the specified URL.
                HttpWebRequest myWebRequest = (HttpWebRequest)WebRequest.Create("https://www.planwallpaper.com/static/images/HD-Wallpapers-C76_yCO55lB.jpg");

                myWebRequest.Method = "GET";
                myWebRequest.ContentType = "image/jpeg";

                // Sends the HttpWebRequest and waits for the response.		
                HttpWebResponse myHttpWebResponse = (HttpWebResponse)myWebRequest.GetResponse();   //HttpWebRequest_GetResponse():  Returns a response from an Internet resource.

                //get Stream Data from the response
                Stream receiveStream = myHttpWebResponse.GetResponseStream();

                //read the response from stream.
                StreamReader streamReader = new StreamReader(receiveStream);

                byte[] data = System.Text.Encoding.Default.GetBytes(streamReader.ReadToEnd());
                Response.ContentType ="image/jpeg";
                Response.BinaryWrite(data);
                Response.End();

推荐答案

引用：

//get Stream Data from the response
Stream receiveStream = myHttpWebResponse.GetResponseStream();

//read the response from stream.
StreamReader streamReader = new StreamReader(receiveStream);

byte[] data = System.Text.Encoding.Default.GetBytes(streamReader.ReadToEnd());

You '从远程服务器读取二进制数据。您正在将二进制数据发送回客户端。那么为什么要将二进制数据转换为字符串（使用UTF8），然后将其转换回二进制（使用服务器的默认编码）？



删除该步骤，这可能会解决您的问题：

You're reading binary data from the remote server. You're sending binary data back to the client. So why are you converting that binary data to a string (using UTF8), and then converting it back to binary (using your server's default encoding)?

Remove that step, and that will probably fix your problem:

Stream receiveStream = myHttpWebResponse.GetResponseStream();

Response.ContentType ="image/jpeg";
receiveStream.CopyTo(Response.OutputStream);
Response.End();

如果你想从url下载图像，那么最好的方法是使用

If You want to Download image from url then the best way is used

System.Net.WebClient

试试这个：

Try This:

Using System.Net.WebClient;

string imageUrl = "https://www.planwallpaper.com/static/images/HD-Wallpapers-C76_yCO55lB.jpg";
string SavePath = @"D:\Pictures\HD-Wallpapers-C76_yCO55lB.jpg";
System.Net.WebClient client = new WebClient();
client.DownloadFile(new Uri(imageUrl), SavePath);

好的然后试试这个：

Okay then try this:

public void save_file_from_url(string file_name, string url)
    {
        byte[] content;
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        WebResponse response = request.GetResponse();
 
        Stream stream = response.GetResponseStream();
 
        using (BinaryReader br = new BinaryReader(stream))
        {
            content = br.ReadBytes(500000);
            br.Close();
        }
        response.Close();
 
        FileStream fs = new FileStream(file_name, FileMode.Create);
        BinaryWriter bw = new BinaryWriter(fs);
        try
        {
            bw.Write(content);
        }
        finally
        {
            fs.Close();
            bw.Close();
        }
    }

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