远程发送和接收数据流生成图片

将图片转成数据流方式发送到远程服务，在通过服务器后台程序来接收数据流，再保存成图片存放在需要的地方。

这种方式就类似上传图片功能一样，希望能给一些园友另一种上传图片功能的方法。

发送数据流方法

    /// <summary>
    /// PostBinaryData
    /// </summary>
    /// <param name="url">要发送的 url 网址</param>
    /// <param name="bytes">要发送的数据流</param>
    /// <returns></returns>
    public string PostBinaryData(string url, byte[] bytes)
    {
　　　　　//下面是测试例子
        //string url = "http://www.test.com/test.ashx";
        //string img = HttpContext.Current.Server.MapPath("../images/test.jpg");
        //byte[] bytes = File.ReadAllBytes(img);

        HttpWebRequest wRequest = (HttpWebRequest)WebRequest.Create(url);
        wRequest.ContentType = "multipart/form-data";
        wRequest.ContentLength = bytes.Length;
        wRequest.Method = "POST";

        Stream stream = wRequest.GetRequestStream();
        stream.Write(bytes, 0, bytes.Length);
        stream.Close();

        HttpWebResponse wResponse = (HttpWebResponse)wRequest.GetResponse();
        StreamReader sReader = new StreamReader(wResponse.GetResponseStream(), System.Text.Encoding.UTF8);
        string str = sReader.ReadToEnd();
        sReader.Close();
        wResponse.Close();
        return str;
    }

接收数据流方法

    public void GetBinaryData()
    {
        string imgFile = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
        string filePath = HttpContext.Current.Server.MapPath(imgFile);
        
        //方法一
        int lang = HttpContext.Current.Request.TotalBytes;
        byte[] bytes = HttpContext.Current.Request.BinaryRead(lang);
        string content = System.Text.Encoding.UTF8.GetString(bytes);
        FileStream fStream = new FileStream(filePath, FileMode.Create, FileAccess.Write);
        BinaryWriter bw = new BinaryWriter(fStream);
        bw.Write(bytes);
        bw.Close();
        fStream.Close();                
        
        //方法二
        Bitmap img = new Bitmap(HttpContext.Current.Request.InputStream);
        img.Save(filePath);
        
        HttpContext.Current.Response.Write("ok");
        
    }