Upload an image to the server from a mobile application
I am working on a mobile app in .net. This is a Windows mobile application. I am facing a problem in this application that I want to upload an image / file to the specified url / server. Many loading classes are not used like Webclient, WebRequest, WebResponse. I used HttpWebRequest which does not connect to the server. Please, can anyone help me on how to download images from given url in windows mobile 6 in .net.
Thanks in advance.
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Hey, check out this code to upload to Image Shack:
You can change it for use with a different website simply by using Fiddler to modify 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();
}
}
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There is code in CodeProject that reuses WebClient.UploadFile
"more" using only HttpwebRequest
friends that at first glance looks like it uses features available in the Compact Framework. You can check if the full wireframe code works on a PC and use a tool like Fiddler to check what's going on over the wire. before compiling for Compact Framework.
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