Webservice for file upload using Multipart form data

Question

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I am facing critical problem that How to make webservice that uses TransferFile() method by multipart form data?.
I have write following code for it:

C#

[WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public void TransferFile()
        {

            HttpContext postedContext = HttpContext.Current;
            HttpFileCollection Request = postedContext.Request.Files;
            foreach (HttpPostedFile item in Request)
            {
                string filename = item.FileName;

                byte[] fileBytes = new byte[item.ContentLength];
                item.InputStream.Read(fileBytes, 0, item.ContentLength);
                TransferFile(filename, fileBytes);

                //objFileTransfer.TransferFile(filename, fileBytes);
                retJSON = js.Serialize(new { Result = objFileTransfer.TransferFile(filename, fileBytes) });
                Context.Response.Write(retJSON);
                // fileBytes now contains the content of the file
                // filename contains the name of the file
            }            
        }

Is this webservice get multipart form data?
When an iPhone developer consume this api they are not getting response.

C#

private FtpWebRequest ftpRequest = null;
        //private FtpWebResponse ftpResponse = null;
        private Stream ftpStream = null;
        private int bufferSize = 2048;

        public string TransferFile(string filename, byte[] fileContent)
        {
            string strMsg = string.Empty;
            try
            {
                
                /* Create an FTP Request */
                String uploadUrl = String.Format("{0}/{1}/{2}", "ftp://Address", "DirectoryName", filename);
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(uploadUrl);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential("Username", "Password");
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;
                try
                {
                    
                    ftpRequest.ContentLength = fileContent.Length;

                    Stream requestStream = ftpRequest.GetRequestStream();
                    requestStream.Write(fileContent, 0, fileContent.Length);
                    requestStream.Close();
                    FtpWebResponse response = (FtpWebResponse)ftpRequest.GetResponse();
                    strMsg = "File Upload Status: " + response.ToString();
                    
                }
                catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                /* Resource Cleanup */
                ftpStream.Close();
                ftpRequest = null;
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            return strMsg;
 
        }

Posted 23-May-13 23:49pm

rajesh@1989

Updated 24-May-13 23:43pm

v3

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Comments

Sunasara Imdadhusen 24-May-13 5:51am

Use form submit method to post your multipart date

rajesh@1989 24-May-13 5:54am

I do not understand what you want to say. I already added on web.config file.

2 solutions

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Sunasara Imdadhusen · Answer 1 · 2013-05-24T00:05:00

Solution 1

Hello Rajesh,

Following are sample code. When clicking on submit button it will post selected files data to the mentioned (action) website.

HTML

<form id="Form1" action="htt://mysite.com/photo" method="post" enctype="multipart/form-data">
     <input id="myPhoto" name="myPhoto" type="file" />
     <input type="submit" />
</form>

Thanks,
Imdadhusen

Posted 24-May-13 0:05am

Sunasara Imdadhusen

Comments

rajesh@1989 24-May-13 6:11am

I wrote following code on demo application use consume web service and web service is giving response like: Unable to cast object of type 'System.String' to type 'System.Web.HttpPostedFile'.

<form id="form1" runat="server" action="http://MySiteAddress/FileTransfer.asmx/TransferFile" enctype="multipart/form-data">
<asp:FileUpload runat="server" id="fileArray"/>
<asp:Button ID="btnSubmit" runat="server" Text="Upload" onclick="btnSubmit_Click" />
<asp:Button ID="Button1" runat="server" önclick="Button1_Click" Text="Button" />
</form></pre>

rajesh@1989 24-May-13 6:46am

Please give me some solution for it. It is very urgent as I am on stuck.
Thank you!!

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2013-05-27T18:11:00

Solution 2

Please check the answer - WCF service to accept a post encoded multipart/form-data[^].

This might help you.

Posted 27-May-13 18:11pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

rajesh@1989 28-May-13 15:13pm

[ServiceContract]
public interface IFileUpload
{
[OperationContract]
[WebInvoke(
Method = "POST",
BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat=WebMessageFormat.Json,
UriTemplate = "/UploadedFiles/")]
void Upload(Stream data);
}
public class FileUpload : IFileUpload
{
public void Upload(Stream data)
{
StringBuilder sb = new StringBuilder();
try
{
string contentType = WebOperationContext.Current.IncomingRequest.ContentType;
if (!contentType.StartsWith("multipart/form-data; boundary="))
{
throw new ArgumentException("Error, invalid Content-Type: " + contentType);
}

MemoryStream ms = new MemoryStream();
byte[] buffer = new byte[1000];
int bytesRead = 0;
do
{
bytesRead = data.Read(buffer, 0, buffer.Length);
ms.Write(buffer, 0, bytesRead);
} while (bytesRead > 0);
sb.AppendLine("Request size: " + ms.Position);
string boundary = contentType.Substring("multipart/form-data; boundary=".Length);
byte[] boundaryBytes = Encoding.ASCII.GetBytes(boundary);
byte[] requestBytes = ms.ToArray();
int index = 0;
Debug.Assert(requestBytes[0] == (byte)'-', "First char is '-'");
Debug.Assert(requestBytes[1] == (byte)'-', "Second char is '-'");
index = 2;
string boundaryLine = ReadLine(requestBytes, ref index);
Debug.Assert(boundaryLine == boundary, "First line is boundary");
string contentDispositionLine = ReadLine(requestBytes, ref index);
Debug.Assert(contentDispositionLine.StartsWith("Content-Disposition"), "First line of part is Content-Disposition");
sb.AppendLine(contentDispositionLine);
string contentTypeLine = ReadLine(requestBytes, ref index);
Debug.Assert(contentTypeLine.StartsWith("Content-Type"), "Second line of part is Content-Type");
sb.AppendLine(contentTypeLine);
string emptyLine = ReadLine(requestBytes, ref index);
Debug.Assert(emptyLine == "", "Third line is empty");
byte[] file = new byte[requestBytes.Length - index - "\r\n--".Length - boundaryBytes.Length - "--\r\n".Length];
Array.Copy(requestBytes, index, file, 0, file.Length);
File.WriteAllBytes(@"\UploadedFiles\a.txt", file);
sb.AppendLine("File saved to a.txt, len = " + file.Length);
}
catch (Exception e)
{
sb.AppendFormat("{0}: {1}", e.GetType().FullName, e.Message);
sb.AppendLine();
}
WebOperationContext.Current.OutgoingResponse.ContentType = "text/plain";
// return new MemoryStream(Encoding.UTF8.GetBytes(sb.ToString()));
}
string ReadLine(byte[] buffer, ref int index)
{
StringBuilder sb = new StringBuilder();
while (index < buffer.Length - 1 && buffer[index] != 0x0D && buffer[index] != 0x0A)
{
sb.Append((char)buffer[index]);
index++;
}
index += 2;
return sb.ToString();
}
}
What is wrong in above code? is above works to accept multipart/form-data? Due to stream is used I cann't test it. It is not consuming through multipart/form-data by iphone. I am newbie in WCF Multipart/Form-data. Please help me