In my mobile web application i have one page within user can view attachments.
The attachment can be any type of file (jpg,png,txt,doc,zip, etc).
The view attachment action is in the form of <a> tag that points to an aspx file that process the request.
HTML:
<a class="attachBtn" href="_layouts/ViewFile.aspx?messageAttachmentInstanceId={some id}"></a>
ViewFile.aspx:
public partial class ViewFile : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
System.IO.BinaryWriter bw = null;
System.IO.MemoryStream ms = null;
System.IO.StreamReader sr = null;
try
{
string contentType = string.Empty;
byte[] content = null;
string fileName = string.Empty;
if (!string.IsNullOrEmpty(Request.QueryString["messageAttachmentInstanceId"]) &&
!string.IsNullOrEmpty(Request.QueryString["messageInstanceId"]))
{
int messageInstanceId = Int32.Parse(Request.QueryString["messageInstanceId"]);
Guid attachmentInstanceId;
GuidUtil.TryParse(Request.QueryString["messageAttachmentInstanceId"], out attachmentInstanceId);
MessageInstance messageInstance = WorkflowEngineHttpModule.Engine.GetService<IMessagingService>()
.GetMessageInstance(messageInstanceId);
if (messageInstance != null)
{
MessageAttachmentInstance attachmentInstnace = messageInstance.Attachments[attachmentInstanceId];
contentType = attachmentInstnace.ContentType;
fileName = attachmentInstnace.FileName;
content = attachmentInstnace.Content;
}
}
this.Response.ContentType = contentType;
string headerValue = string.Format("attachment;filename={0}",
this.Server.UrlPathEncode(fileName));
Response.AddHeader("content-disposition", headerValue);
bw = new System.IO.BinaryWriter(this.Response.OutputStream);
bw.Write(content);
}
catch (Exception ex)
{
LogError("ViewFile.aspx, "
+ ex.InnerException, ex);
}
finally
{
if (sr != null)
sr.Close();
if (ms != null)
ms.Close();
if (bw != null)
bw.Close();
}
}
}
The Problem:
in Android devices when user click on attachment the file is downloaded automatically which is the desirable behavior because the user can open the file later with any tool he wants and even if the file type is not supported user can later on download a tool which can open it.
but in iOS devices the file is not downloaded but instead redirects to ViewFile.aspx and tries to open the file within the browser and if the file type is not supported it shows alert: "safari cannot download this file".
even if the file type is supported i want it to be downloaded and not open by default.
How can i achieve this behavior?
AFAIK, you cannot download files on iOS.
Known files that Safari (or any app that has registered a file type, e.g. ZIP) supports will open or show a dialog letting the user choose how to open the file.
You can't control the behavior from your web app/site.
Related
Background
I have banged my head against this for a while and not made much progress. I am generating MPEG_4 / AAC files in Android and sending them by email as .mp3 files. I know they aren't actually .mp3 files, but that allows Hotmail and Gmail to play them in Preview. They don't work on iPhone though, unless they are sent as .m4a files instead which breaks the Outlook / Gmail Preview.
So I have thought of a different approach which is to attach as a .mp3 file but have an HTML link in the email body which allows the attached file to be downloaded and specifies a .m4a file name. Gmail / Outlook users can click the attachment directly whereas iPhone users can use the HTML link.
Issue
I can send an email using JavaMail with HTML in it including a link which should be pointing at the attached file to allow download of that file by the link. Clicking on the link in Gmail (Chrome on PC) gives a 404 page and iPhone just ignores my clicking on the link.
Below is the code in which I generate a multipart message and assign a CID to the attachment which I then try to access using the link in the html part. It feels like I am close, but maybe that is an illusion. I'd be massively grateful if someone could help me fix it or save me the pain if it isn't possible.
private int send_email_temp(){
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", smtp_host_setting);
//props.put("mail.debug", "true");
props.put("mail.smtp.ssl.enable", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.port", smtp_port_setting);
session = Session.getInstance(props);
ActuallySendAsync_temp asy = new ActuallySendAsync_temp(true);
asy.execute();
return 0;
}
class ActuallySendAsync_temp extends AsyncTask<String, String, Void> {
public ActuallySendAsync_temp(boolean boo) {
// something to do before sending email
}
#Override
protected Void doInBackground(String... params) {
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(username));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(recipient_email_address));
message.setSubject(email_subject);
Multipart multipart = new MimeMultipart();
MimeBodyPart messageBodyPart = new MimeBodyPart();
String file = mFileName;
/**/
DataSource source = new FileDataSource(file);
messageBodyPart.setDataHandler(new DataHandler(source));
/* /
File ff = new File(file);
try {
messageBodyPart.attachFile(ff);
} catch(IOException eio) {
Log.e("Message Error", "Old Macdonald");
}
/* /
messageBodyPart = new PreencodedMimeBodyPart("base64");
byte[] file_bytes = null;
File ff = new File(file);
try {
int length = (int) ff.length();
BufferedInputStream reader = new BufferedInputStream(new FileInputStream(ff));
file_bytes = new byte[length];
reader.read(file_bytes, 0, length);
reader.close();
} catch (IOException eio) {
Log.e("Message Error", "Old Macdonald");
}
messageBodyPart.setText(Base64.encodeToString(file_bytes, Base64.DEFAULT));
messageBodyPart.setHeader("Content-Transfer-Encoding", "base64");
/**/
messageBodyPart.setFileName( DEFAULT_AUDIO_FILENAME );//"AudioClip.mp3");
//messageBodyPart.setContentID("<audio_clip>");
String content_id = UUID.randomUUID().toString();
messageBodyPart.setContentID("<" + content_id + ">");
messageBodyPart.setDisposition(Part.ATTACHMENT);//INLINE);
messageBodyPart.setHeader("Content-Type", "audio/mp4");
multipart.addBodyPart(messageBodyPart);
MimeBodyPart messageBodyText = new MimeBodyPart();
//final String MY_HTML_MESSAGE = "<h1>My HTML</h1><a download=\"AudioClip.m4a\" href=\"cid:audio_clip\">iPhone Download</a>";
final String MY_HTML_MESSAGE = "<h1>My HTML</h1><a download=\"AudioClip.m4a\" href=\"cid:" + content_id + "\">iPhone Download</a>";
messageBodyText.setContent( MY_HTML_MESSAGE, "text/html");
multipart.addBodyPart(messageBodyText);
message.setContent(multipart);
Print_Message_To_Console(message);
Transport transport = session.getTransport("smtp");
transport.connect(smtp_host_setting, username, password);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
} catch (MessagingException e) {
e.printStackTrace();
} finally {
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
// something to do after sending email
}
}
int Print_Message_To_Console(Message msg) {
int ret_val = 0;
int line_num = 0;
InputStream in = null;
InputStreamReader inputStreamReader = null;
BufferedReader buff_reader = null;
try {
in = msg.getInputStream();
inputStreamReader = new InputStreamReader(in);
buff_reader = new BufferedReader(inputStreamReader);
String temp = "";
while ((temp = buff_reader.readLine()) != null) {
Log.d("Message Line " + Integer.toString(line_num++), temp);
}
} catch(Exception e) {
Log.d("Message Lines", "------------ OOPS! ------------");
ret_val = 1;
} finally {
try {
if (buff_reader != null) buff_reader.close();
if (inputStreamReader != null) inputStreamReader.close();
if (in != null) in.close();
} catch(Exception e2) {
Log.d("Message Lines", "----------- OOPS! 2 -----------");
ret_val = 2;
}
}
return ret_val;
}
You need to create a multipart/related and set the main text part as the first body part.
I am working with MVC5 Crystal reports of pdf and excel files, my code works well for pdf to view in the web browser but when i change content-type to excel file its download only,
public ActionResult Summary(string startDate, string endDate, string summaryBy, string reportType)
{
using (MMTModel entity = new MMTModel())
{
string CryRpt_Name = null;
ObjectResult<DeeqtoonSummary> ObjRsl = null;
if (reportType == "Summary")
{
CryRpt_Name = "Summary.rpt";
ObjRsl = entity.rpt_Summary(startDate, endDate, summaryBy);
}
else if (reportType == "Detail")
{
CryRpt_Name = "Detail.rpt";
ObjRsl = entity.rpt_Detail(startDate, endDate);
}
ReportDocument rpt = new ReportDocument();
rpt.Load(Path.Combine(rpt.FileName = Server.MapPath("~/CrystalReports"), CryRpt_Name));
List<Summary> ObjRslLst = ObjRsl.ToList();
rpt.SetDataSource(ObjRslLst);
try
{
//Excel file
Stream stream = rpt.ExportToStream(ExportFormatType.Excel);
return File(stream, "application/vnd.ms-excel");
//pdf file
Stream stream = rpt.ExportToStream(ExportFormatType.PortableDocFormat);
return File(stream, "application/pdf");
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
}
}
How can i force to open the excel file in the web browser?
I don't know anything about crystal-reports, but if your browser doesn't have an implementation for viewing excel documents then it will just download them. I have never been able to open an excel document with my browser unless the web application itself implements the display of the document.
Basically, you have to implement the MVC that displays an excel document yourself. Your browser doesn't support it out of the box.
I have an asp.net MVC application, below code works file.
But the code is that, When navigate to Email action in browser, an EML file is download, then when we click on that file, the file will open with outlook.
Can it be possible, when action calls, then EML file will directly open with outlook, instead of download and then click to open??
Code
public async Task<FileStreamResult> Email()
{
string dummyEmail = "test#localhost.com";
var mailMessage = new MailMessage();
mailMessage.From = new MailAddress(dummyEmail);
mailMessage.To.Add("dejan.caric#gmail.com");
mailMessage.Subject = "Test subject";
mailMessage.Body = "Test body";
// mark as draft
mailMessage.Headers.Add("X-Unsent", "1");
// download image and save it as attachment
using (var httpClient = new HttpClient())
{
var imageStream = await httpClient.GetStreamAsync(new Uri("http://dcaric.com/favicon.ico"));
mailMessage.Attachments.Add(new Attachment(imageStream, "favicon.ico"));
}
var stream = new MemoryStream();
ToEmlStream(mailMessage, stream, dummyEmail);
stream.Position = 0;
return File(stream, "message/rfc822", "test_email.eml");
}
private void ToEmlStream(MailMessage msg, Stream str, string dummyEmail)
{
using (var client = new SmtpClient())
{
var id = Guid.NewGuid();
var tempFolder = Path.Combine(Path.GetTempPath(), Assembly.GetExecutingAssembly().GetName().Name);
tempFolder = Path.Combine(tempFolder, "MailMessageToEMLTemp");
// create a temp folder to hold just this .eml file so that we can find it easily.
tempFolder = Path.Combine(tempFolder, id.ToString());
if (!Directory.Exists(tempFolder))
{
Directory.CreateDirectory(tempFolder);
}
client.UseDefaultCredentials = true;
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = tempFolder;
client.Send(msg);
// tempFolder should contain 1 eml file
var filePath = Directory.GetFiles(tempFolder).Single();
// create new file and remove all lines that start with 'X-Sender:' or 'From:'
string newFile = Path.Combine(tempFolder, "modified.eml");
using (var sr = new StreamReader(filePath))
{
using (var sw = new StreamWriter(newFile))
{
string line;
while ((line = sr.ReadLine()) != null)
{
if (!line.StartsWith("X-Sender:") &&
!line.StartsWith("From:") &&
// dummy email which is used if receiver address is empty
!line.StartsWith("X-Receiver: " + dummyEmail) &&
// dummy email which is used if receiver address is empty
!line.StartsWith("To: " + dummyEmail))
{
sw.WriteLine(line);
}
}
}
}
// stream out the contents
using (var fs = new FileStream(newFile, FileMode.Open))
{
fs.CopyTo(str);
}
}
}
With Chrome you can make it automatically open certain files, once they are downloaded.
.EML should attempt to open in Outlook.
I am not sure about other browsers, but Chrome seemed to be the only one with this option.
It's not a pefect solution because if someone downloaded an .EML from another website in Chrome, it will open automatically aswell.
I recommend having Chrome dedicated to your Web application.
You sure can open local .eml file with Outlook.
But in context of web application, you must firstly download it.
Using Groovy 1.8.6 and Grails 2.1.0
Using embedded API, after user signs document, browser is redirected back to my app. Using "Get Envelope Documents and Certificate" API to download document to server. URL format:
"${baseUrl}/envelopes/${envelopeId}/documents/combined"
Code snippet (with minor details removed):
private void getDocument(requestUrl) {
def connection = urlConnect(requestUrl, null, "GET")
if (connection.responseCode == 200) {
savePDF(envelopeId, connection.inputStream)
}
}
private void savePDF(envelopeId, inputStream) {
String filePath = getSavedPDFPath(envelopeId)
def pdfWriter = new File(filePath).newWriter()
pdfWriter << inputStream
pdfWriter.close()
}
What happens is that the resulting file is not 100% correct, Adobe Reader complains that "at least one signature is invalid". Reader at least knows that the file was signed by DocuSign, Inc., and can show details about the certificate.
Per the Question's comment thread, the issue was being caused by the way the file was being saved. Using this code instead, the file saves / opens correctly:
private void savePDF(envelopeId, connection)
{
FileOutputStream fop = null;
File file;
String filePath = getSavedPDFPath(envelopeId);
try {
file = new File(filePath);
fop = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int numRead;
while((numRead = connection.getInputStream().read(buffer)) > 0)
{
fop.write(buffer, 0, numRead);
}
fop.flush();
fop.close();
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
Trying to use JSR 75 to access media saved under the '/home/video/' directory on the device. Using Blackbery JDK 4.6.1. Single line of code throws a 'FileSystem IO Error' Exception. Which is, as usual, unhelpful in the extreme.
fconn = (FileConnection)Connector.open("file:///home/user/videos/"+name, Connector.READ);
Has anyone tried to do this? I can open files within my jar, but can't seem to access the media folder. I have the javax.microedition.io.Connector.file.read permission set and my appplication is signed.
There are two kind of filesystems on BlackBerry - SDCard and store. You have to use one of them, defining it in the path. Standard directory on SDCard where video, music etc stored is "file:///SDCard/BlackBerry".
String standardPath = "file:///SDCard/BlackBerry";
String videoDir = System.getProperty("fileconn.dir.videos.name");
String fileName = "video.txt";
String path = standardPath+"/"+videoDir+"/"+fileName;
String content = "";
FileConnection fconn = null;
DataInputStream is = null;
ByteVector bytes = new ByteVector();
try {
fconn = (FileConnection) Connector.open(path, Connector.READ);
is = fconn.openDataInputStream();
int c = is.read();
while(-1 != c)
{
bytes.addElement((byte) (c));
c = is.read();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
content = new String(bytes.toArray());
add(new RichTextField(content));
See also
SUN Dev Network - Getting Started with the FileConnection APIs
RIM Forum - Some questions about FileConnection/JSR 75
Use System.getProperty("fileconn.dir.memorycard") to check if SDCard available
How to save & delete a Bitmap image in Blackberry Storm?