从移动应用程序在服务器上上传图像

Question

I am working on a mobile application on .net. This is a windows mobile application. I am facing a problem in this application that I wanna upload an image/file to given url/server. Many upload classes is not using like Webclient, WebRequest, WebResponse. I used HttpWebRequest, That is not connecting with server. Please anyone can help me on how to upload the images on given url in windows mobile 6 in .net.

Thanks in advance.

Answer 1

Hey take a look at this code for uploading at Image Shack:

You can modify it to use with other web site by just using Fiddler to change the web requests

public class Uploader
    {

        public string UploadFileToImageShack(object oFileName)
        {
            try
            {
                string fileName = oFileName as string;
                string contentType = null;
                CookieContainer cookie = new CookieContainer();
                NameValueCollection col = new NameValueCollection();
                col["MAX_FILE_SIZE"] = "3145728";
                col["refer"] = "";
                col["brand"] = "";
                col["optimage"] = "1";
                col["rembar"] = "1";
                col["submit"] = "host it!";
                List<string> l = new List<string>();
                switch (fileName.Substring(fileName.Length - 3, 3))
                {
                    case "jpg":
                        contentType = "image/jpeg";
                        break;
                    case "peg":
                        contentType = "image/jpeg";
                        break;
                    case "gif":
                        contentType = "image/gif";
                        break;
                    case "png":
                        contentType = "image/png";
                        break;
                    case "bmp":
                        contentType = "image/bmp";
                        break;
                    case "tif":
                        contentType = "image/tiff";
                        break;
                    case "iff":
                        contentType = "image/tiff";
                        break;
                    default:
                        contentType = "image/unknown";
                        break;
                }

                string resp;
                col["optsize"] = "resample";
                resp = UploadFileEx(fileName,
                                               "http://www.imageshack.us/index.php",
                                               "fileupload",
                                               contentType,
                                               col,
                                               cookie);
                return resp;


            }
            catch (Exception ex)
            {
                return "";
            }
        }



        public static string UploadFileEx(string uploadfile, string url,
           string fileFormName, string contenttype, System.Collections.Specialized.NameValueCollection querystring,
           CookieContainer cookies)
        {
            if ((fileFormName == null) ||
                (fileFormName.Length == 0))
            {
                fileFormName = "file";
            }

            if ((contenttype == null) ||
                (contenttype.Length == 0))
            {
                contenttype = "application/octet-stream";
            }


            string postdata;
            postdata = "?";
            if (querystring != null)
            {
                foreach (string key in querystring.Keys)
                {
                    postdata += key + "=" + querystring.Get(key) + "&";
                }
            }
            Uri uri = new Uri(url + postdata);


            string boundary = "----------" + DateTime.Now.Ticks.ToString("x");
            HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
            webrequest.CookieContainer = cookies;
            webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
            webrequest.Method = "POST";


            // Build up the post message header
            StringBuilder sb = new StringBuilder();
            sb.Append("--");
            sb.Append(boundary);
            sb.Append("\r\n");
            sb.Append("Content-Disposition: form-data; name=\"");
            sb.Append(fileFormName);
            sb.Append("\"; filename=\"");
            sb.Append(Path.GetFileName(uploadfile));
            sb.Append("\"");
            sb.Append("\r\n");
            sb.Append("Content-Type: ");
            sb.Append(contenttype);
            sb.Append("\r\n");
            sb.Append("\r\n");

            string postHeader = sb.ToString();
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

            // Build the trailing boundary string as a byte array
            // ensuring the boundary appears on a line by itself
            byte[] boundaryBytes =
                   Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

            FileStream fileStream = new FileStream(uploadfile,
                                        FileMode.Open, FileAccess.Read);
            long length = postHeaderBytes.Length + fileStream.Length +
                                                   boundaryBytes.Length;
            webrequest.ContentLength = length;

            Stream requestStream = webrequest.GetRequestStream();

            // Write out our post header
            requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

            // Write out the file contents
            byte[] buffer = new Byte[checked((uint)Math.Min(4096,
                                     (int)fileStream.Length))];
            int bytesRead = 0;
            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                requestStream.Write(buffer, 0, bytesRead);

            // Write out the trailing boundary
            requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
            WebResponse responce = webrequest.GetResponse();
            Stream s = responce.GetResponseStream();
            StreamReader sr = new StreamReader(s);

            return sr.ReadToEnd();
        } 


    }

Answer 2

There is example code on CodeProject that reimplements WebClient.UploadFile "with more" using just HttpwebRequest and friends, which at first glance looks like it uses features that are available in the Compact Framework. You could check the code works with the full framework on a PC and use a tool like Fiddler to check what goes over the wire., before then compiling for the Compact Framework.