my application take snapshots using webcam and save them in a local folder. so i'm using following code to convert my Silverlight Snapshot to a byte array and send it through the Web Service. name of my web service is ImageService.
ImageServiceSoapClient client = new ImageServiceSoapClient();
private void source_CaptureImageCompleted(object sender, CaptureImageCompletedEventArgs e)
{
WriteableBitmap bmp = new WriteableBitmap(320, 240);
bmp = e.Result;
byte[] buffer = bmp.ToByteArray();
client.SaveImageToLocalAsync(buffer, txtUserName.Text);
}
and this is my server side code..
[WebMethod]
public string SaveImageToLocal(byte[] buffer,string name)
{
try
{
Bitmap bmp = new Bitmap(320, 240);
using (MemoryStream stream = new MemoryStream(buffer))
{
bmp = new Bitmap(stream);
string saveString = GetFolder() + name + ".jpg";
bmp.Save(saveString, System.Drawing.Imaging.ImageFormat.Jpeg);
}
return "Servers says : Saved..!!";
}
catch (Exception ex)
{
return "Server says : " + ex.Message;
}
}
so when i run this application, i'm getting an exception saying "Server says : Parameter is not valid"..
can anyone please tell me what's wrong with this code? i spent weeks to solve this problem. please help... :( thanks...
Related
I have an upload image function that uploads images to the server but I am only able to add images into the server until the session ends. Once the session ends , I noticed that the images uploaded are not stored into my local solution and after some research I found out that we could make uploaded files be stored into our solution even when the session ends but I am unsure of how to implement it. I am very new to this and would appreciate all help given.
For now this is the code I have that allows me to upload my image:
protected void btnConfirm_Click(object sender, EventArgs e)
{
string uploadedPhoto = "";
if (uploadImage.HasFile)
{
string savePath;
//Find the filename extension of the file to be uploaded.
string fileExt = Path.GetExtension(uploadImage.FileName);
//rename the uploaded file with name
uploadedPhoto = txtName.Text + fileExt;
savePath = MapPath("~/Images/profile pictures/" + uploadedPhoto);
try
{
uploadImage.SaveAs(savePath);
lblMsg.Text = "Image uploaded!";
imgprw.ImageUrl = "~/Images/profile pictures/" + uploadedPhoto;
}
catch (IOException)
{
lblMsg.Text = "Image upload failed!";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
}
I see your code is right because I used same way to upload and store image into folder like you.
string path = Server.MapPath("~/Photos/" + f.FileName);
f.SaveAs(path);
May I see your full code ?
To accomplish:
Upload a file from my local to server using an applet and servlet using apache fileupload jar.
Tried:
I have used a simple jsp, with a browse button and posted the action to my servlet (where I used apache fileupload). I was successful in uploading the file to the server.
Issue:
I am trying to upload a file, from my local machine, using an applet. I do not want to manually select files, instead upload files that are present in a specific folder. For now I have hardcoded the folder. I am able to look at the folder and get the list of files I want to upload.
Also, I have successfully established a connection from my applet to servlet.
Issue arises at the upload.parseRequest(request) in the servlet. I'm thinking its because the applet cannot post to servlet's request object.
Also, I have set the request type to multipart/form-data in my applet.
Right now, I am trying to pass the absolute path of the file to servlet and upload.
I have seen other posts where byte stream data is passed from applet to servlet, but the servlet uses the traditional File.write.
For me, it is mandatory to achieve this using apache fileupload.
Please suggest on how to pass a file/file path from applet to servlet, where the upload is handled by apache fileupload.
Below are my FileUploadHandler (where the HTTP requests are handled) and FileUpload(which is my applet)
Below is my FileUpload Handler:
#WebServlet(name = "FileUploadHandler", urlPatterns = { "/upload" })
#MultipartConfig
public class FileUploadHandler extends HttpServlet {
String uploadFolder ="";
#Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("doPost-servlet URL is: "
+ request.getRequestURL());
try {
uploadFolder = fileToUpload(request);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
uploadFolder = getServletContext().getRealPath("")+ File.separator;
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// process only if its multipart content
if (ServletFileUpload.isMultipartContent(request)) {
System.out.println("Yes, it is a multipart request...");
try {
List<FileItem> multiparts = upload.parseRequest(request);
System.out.println("Upload.parseRequest success !");
for (FileItem item : multiparts) {
if (!item.isFormField()) {
String name = new File(item.getName()).getName();
item.write(new File(uploadFolder + File.separator
+ name));
}
}
System.out.println("File uploaded to server !");
// File uploaded successfully
request.setAttribute("message", "File Uploaded Successfully");
} catch (Exception ex) {
request.setAttribute("message", "File Upload Failed due to "
+ ex);
}
} if(!ServletFileUpload.isMultipartContent(request)){
throw new ServletException("Content type is not multipart/form-data");
}
doGet(request, response);
//request.getRequestDispatcher("/result.jsp").forward(request, response);
OutputStream outputStream = response.getOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
objectOutputStream.writeObject("Success !");
objectOutputStream.flush();
objectOutputStream.close();
}
private String fileToUpload(HttpServletRequest request) throws IOException,
ClassNotFoundException {
ServletInputStream servletIn = request.getInputStream();
ObjectInputStream in = new ObjectInputStream(servletIn);
String uploadFile = (String) in.readObject();
System.out.println("Value in uploadFolder is: " + uploadFile);
return uploadFile;
}
Below is the fileupload applet:
public class FileUpload extends Applet {
private JButton capture;
private JTextField textField;
private final String pathDirectory = "C:\\";
private final String captureConfirmMessage = "Are you sure you want to continue?";
private final String confirmDialogTitle = "Confirm upload";
final File folder = new File(pathDirectory);
public void init() {
upload= new JButton("Upload");
textField = new JTextField();
capture.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
int selection = JOptionPane.showConfirmDialog(upload,
uploadConfirmMessage, confirmDialogTitle,
JOptionPane.YES_NO_OPTION);
if (selection == JOptionPane.OK_OPTION) {
listFilesForFolder(folder);
} else if (selection == JOptionPane.CANCEL_OPTION) {
JOptionPane.showMessageDialog(upload,
"You have aborted upload", "Upload Cancelled", 2);
}
}
});
add(upload);
add(textField);
}
public void listFilesForFolder(final File folder) {
for (final File fileEntry : folder.listFiles()) {
if (fileEntry.isDirectory()) {
listFilesForFolder(fileEntry);
} else {
try {
onSendData(fileEntry.getAbsolutePath());
System.out.println(fileEntry.getAbsolutePath());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
private URLConnection getServletConnection() throws MalformedURLException,
IOException {
// Open the servlet connection
URL urlServlet = new URL("http://localhost:8081/UploadFile/upload");
HttpURLConnection servletConnection = (HttpURLConnection) urlServlet
.openConnection();
// Config
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches(false);
servletConnection.setDefaultUseCaches(false);
servletConnection.setRequestProperty("Content-Type", "multipart/form-data;");
servletConnection.connect();
return servletConnection;
}
private void onSendData(String fileEntry) {
try {
// Send data to the servlet
HttpURLConnection servletConnection = (HttpURLConnection) getServletConnection();
OutputStream outstream = servletConnection.getOutputStream();
ObjectOutputStream objectOutputStream= new ObjectOutputStream(
outstream);
objectOutputStream.writeObject(fileEntry);
// Receive result from servlet
InputStream inputStream = servletconnection.getInputStream();
ObjectInputStream objectInputStream = new ObjectInputStream(
inputStream);
String result = (String) objectInputStream.readObject();
objectInputStream.close();
inputStream.close();
out.flush();
out.close();
// Display result on the applet
textField.setText(result);
} catch (java.net.MalformedURLException mue) {
mue.printStackTrace();
textField.setText("Invalid serlvetUrl, error: " + mue.getMessage());
} catch (java.io.IOException ioe) {
ioe.printStackTrace();
textField.setText("Couldn't open a URLConnection, error: "
+ ioe.getMessage());
} catch (Exception e) {
e.printStackTrace();
textField.setText("Exception caught, error: " + e.getMessage());
}
}
public void paint(Graphics g) {
g.drawString("Click the button above to capture", 5, 50);
}
I could finally succeed posting the request to the servlet from the applet.
It was a simple logic that I was missing. I did not add the header and trailer while posting to the servlet, which was the key, in the servlet to identify the incoming request as a multipart data.
FileInputStream fileInputStream = new FileInputStream(new File(
fileEntry));
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream
.writeBytes("Content-Disposition: form-data; name=\"upload\";"
+ " filename=\"" + fileEntry + "\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dataOutputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
System.out.println(fileEntry + " uploaded.");
}
// send multipart form data necesssary after file data
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens
+ lineEnd);
I added the header and trailer and also used this to create the URL connection.
private URLConnection getServletConnection() throws MalformedURLException,
IOException {
// Open the servlet connection
URL urlServlet = new URL("http://localhost:8083/UploadFile/upload");
HttpURLConnection servletConnection = (HttpURLConnection) urlServlet
.openConnection();
// Config
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches(false);
servletConnection.setDefaultUseCaches(false);
servletConnection.setRequestMethod("POST");
servletConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + this.boundary);
servletConnection.setRequestProperty("Connection", "Keep-Alive");
servletConnection.connect();
return servletConnection;
}
Then, in the servlet, I was just reading the data using upload.ParseRequest(request).
Thank you for the help.
I am developing a complaint form. In this this form, I must make a function that uploads a file and then delete the file that was uploaded. I can upload a file to the server, but I can't take a link of the file I upload to the server in order to delete it. Please help me. Here is my code:
public string FilePath;
protected void btAdd_Click(object sender, EventArgs e)
{
if (AttachFile.HasFile)
{
try
{
string[] sizes = {"B", "KB", "MB", "GB"};
double sizeinbytes = AttachFile.FileBytes.Length;
string filename = Path.GetFileNameWithoutExtension(AttachFile.FileName);
string fileextension = Path.GetExtension(AttachFile.FileName);
int order = 0;
while (sizeinbytes >= 1024 && order + 1 < sizes.Length)
{
order++;
sizeinbytes = sizeinbytes/1024;
}
string result = String.Format("{0:0.##} {1}", sizeinbytes, sizes[order]);
string encryptionFileName = EncrytionString(10);
FilePath = "Path" + encryptionFileName.Trim() + AttachFile.FileName.Trim();
AttachFile.SaveAs(FilePath);
}
catch (Exception ex)
{
lbMessage.Visible = true;
lbMessage.Text = ex.Message;
}
}
}
protected void btDelete_Click(object sender, EventArgs e)
{
try
{
File file = new FileInfo(FilePath);
if (file.Exists)
{
File.Delete(FilePath);
}
}
catch (FileNotFoundException fe)
{
lbMessage.Text = fe.Message;
}
catch (Exception ex)
{
lbMessage.Text = ex.Message;
}
}
Each request in asp.net creates a new object of your Page.
If you set variables during one request, they will not be available on the next request.
Your delete logic seems to depend upon FilePath being set during upload. If you want the page to remember that, keep it in the ViewState. The ViewState is maintained across requests to the same page and that would allow you to use the variable FilePath during delete.
This can be easily achieved by making FilePath a property and getting it from the ViewState.
public string FilePath
{
get
{
return (string) ViewState["FilePath"];
}
set
{
ViewState["FilePath"] = value;
}
}
YOU SHOULD DO IT IN THIS WAY.
if (imgUpload.HasFile)
{
String strFileName = imgUpload.PostedFile.FileName;
imgUpload.PostedFile.SaveAs(Server.MapPath("\\DesktopModules\\Indies\\FormPost\\img\\") + strFileName);
SqlCommand cmd01 = new SqlCommand("insert into img (FeaturedImg) Values (#img)", cn01);
cmd01.Parameters.AddWithValue("#img", ("\\DesktopModules\\Indies\\FormPost\\img\\") + strFileName);
}
With this code you can upload file in a particular location in your sites root directory.
and the path will be stored in database as string.
so you can access the file just by using the path stored in database.
If you cant understand anything. or wanna know more u can contact me or ask me here in comments.
I've got an oob app with a webbrowser on it.
The webbrowser source is databound with a URI defined by me. The URI has a path to a webpage from my server that displays a PDF file from its hardrive.
Note that all this is done on a local network.
URI example: uri = new Uri(#"http://ServerName/ProjectName/PDFViewer.aspx?pdf=somePDF.pdf");
Page code-behind:
protected void Page_Load(object sender, EventArgs e)
{
string myURL = Request.Url.ToString();
string[] ParamArray = Regex.Split(myURL, "pdf=");
string Params = ParamArray[ParamArray.Length - 1];
if (Params.Length > 0)
{
Filename = Regex.Replace(Params, #"//", #"\\"); ;
if (File.Exists(Filename))
{
Response.ContentType = "Application/pdf";
Response.WriteFile(Filename); //Write the file directly to the HTTP content output stream.
Response.End();
}
else
this.Title = "PDF Not Found";
}
}
protected void Page_Load(object sender, EventArgs e) { string myURL = Request.Url.ToString(); string[] ParamArray = Regex.Split(myURL, "pdf="); //If the URL has parameters, then get them. If not, return a blank string string Params = ParamArray[ParamArray.Length - 1]; if (Params.Length > 0) { //to the called (src) web page Filename = Regex.Replace(Params, #"//", #"\\"); ; if (File.Exists(Filename)) { Response.ContentType = "Application/pdf"; Response.WriteFile(Filename); //Write the file directly to the HTTP content output stream. Response.End(); } else this.Title = "PDF Not Found"; } }
The first time I set the WebBrowser source everything it displays the PDF. But when I set the URI one second time the app throws an exception: Trying to revoke a drop target that has not been registered (Exception from HRESULT: 0x80040100).
I've done a few tests and here are the results:
1º new Uri(#"http://ServerName/ProjectName/PDFViewer.aspx?pdf=somePDF.pdf");
2º new Uri(#"http://ServerName/ProjectName/PDFViewer.aspx?pdf=someOtherPDF.pdf"); ->error
1º new Uri(#"http://ServerName/ProjectName/PDFViewer.aspx?pdf=somePDF.pdf");
2º new Uri(#"http://www.google.com"); ->error
1º new Uri(#"http://www.google.com");
2º new Uri(#"http://www.microsoft.com");
2º new Uri(#"http://ServerName/ProjectName/PDFViewer.aspx?pdf=somePDF.pdf");
3º new Uri(#"http://ServerName/ProjectName/PDFViewer.aspx?pdf=someOtherPDF.pdf"); ->error
I also forgot to say that when running the app from my browser (using a HTMLHost) the pages display just fine. Opening the pages using a browser will also work well.
It must be some problem with my aspx page. Any ideas?
Pedro
I've managed to resolve this by creating a new browser for each page. If you know of a more elegant solution please share.
I am not sure if I'm following the question/problem correctly but maybe loading the pages async and then assigning to webbrowser? Forgive me if I am off-base here.
public void ShowLink(string linkUrl)
{
if (App.Current.IsRunningOutOfBrowser)
{
var pageRequest = new WebClient();
pageRequest.DownloadStringCompleted += pageRequest_DownloadStringCompleted;
pageRequest.DownloadStringAsync(new Uri(linkUrl, UriKind.Absolute));
}
}
void pageRequest_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
webBrowserLink.NavigateToString(e.Result.ToString());
}
SENARIO: i have few folders on my FTP server, belongs to particular user. Suppose i have 10GB total space and i assign 1GB to each user i.e can accomodate 10 users having 1GB each.
now users can add/delete/edit any type of file to utilize the storage space. All i need to do is to restrict users not to exceed 1gb space for their file storage. For this i want to use FileSystemWatcher to notify me that a user had created/deleted/edited a file so that i can minimize the space from 1gb incase of creation of a file or add a space incase of deletion.
this is the piece of coding using FSW. when user gets loged-in with proper id and password, respective folder is opened (present at FTP server) where he can add/delete/edit any type of file and according to that i hav to monitor d space ulitilized by him.
but d problem is the event handlers (written in console). i dont understand what happens when this code is being runned... i dontknow how to use FSW class so that i can monitor d changes user is making in his folder.
please help ... THANX
using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
public class _Default: System.Web.UI.Page {
public class ClsFileSystemWatcher {
public static void OnChanged(object source, FileSystemEventArgs e) {
Console.WriteLine("File "+e.FullPath+" :"+e.ChangeType);
}
public static void OnDeleted(object source, FileSystemEventArgs e) {
Console.WriteLine("File "+e.FullPath+" :"+e.ChangeType);
}
public static void OnCreated(object source, FileSystemEventArgs e) {
Console.WriteLine("File "+e.FullPath+" :"+e.ChangeType);
}
public static void OnRenamed(object source, RenamedEventArgs e) {
Console.WriteLine("File "+e.OldFullPath+" [Changed to] "+e.FullPath);
}
public static void OnError(object source, ErrorEventArgs e) {
Console.WriteLine("Error "+e);
}
public void FileWatcher(string InputDir) {
using (FileSystemWatcher fsw = new FileSystemWatcher()) {
fsw.Path = InputDir;
fsw.Filter = #"*";
fsw.IncludeSubdirectories = true;
fsw.NotifyFilter = NotifyFilters.FileName|NotifyFilters.Attributes|NotifyFilters.LastAccess|NotifyFilters.LastWrite|NotifyFilters.Security|NotifyFilters.Size|NotifyFilters.CreationTime|NotifyFilters.DirectoryName;
fsw.Changed += OnChanged;
fsw.Created += OnCreated;
fsw.Deleted += OnDeleted;
fsw.Renamed += OnRenamed;
fsw.Error += OnError;
fsw.EnableRaisingEvents = true;
//string strOldFile = InputDir + "OldFile.txt";
//string strNewFile = InputDir + "CreatedFile.txt";
//// Making changes in existing file
//using (FileStream stream = File.Open(strOldFile, FileMode.Append))
//{
// StreamWriter sw = new StreamWriter(stream);
// sw.Write("Appending new line in Old File");
// sw.Flush();
// sw.Close();
//}
//// Writing new file on FileSystem
//using (FileStream stream = File.Create(strNewFile))
//{
// StreamWriter sw = new StreamWriter(stream);
// sw.Write("Writing First line into the File");
// sw.Flush();
// sw.Close();
//}
//File.Delete(strOldFile);
//File.Delete(strNewFile);
// Minimum time given to event handler to track new events raised by the filesystem.
Thread.Sleep(1000);
}
}
}
private DAL conn;
private string connection;
private string id = string.Empty;
protected void Page_Load(object sender, EventArgs e) {
connection = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Documents and Settings\\project\\Desktop\\BE prj\\dbsan.mdb;Persist Security Info=False";
conn = new DAL(connection);
////*** Opening Respective Folder of a User ***////
DirectoryInfo directories = new DirectoryInfo(#"C:\\Inetpub\\ftproot\\san\\");
DirectoryInfo[] folderList = directories.GetDirectories();
if (Request.QueryString["id"] != null) {
id = Request.QueryString["id"];
}
string path = Path.Combine(#"C:\\Inetpub\\ftproot\\san\\", id);
int folder_count = folderList.Length;
for (int j = 0; j < folder_count; j++) {
if (Convert.ToString(folderList[j]) == id) {
Process p = new Process();
p.StartInfo.FileName = path;
p.Start();
}
}
ClsFileSystemWatcher FSysWatcher = new ClsFileSystemWatcher();
FSysWatcher.FileWatcher(path);
}
}
Each time you reload the page you create new FSW - in that case you won't get any events raised, because from the point of newly created FSW nothing was changes. Try to preserve your FileSystemWatcher object in the Session state.
So flow would look like:
User logs in – you create FSW and preserve it in Session
User reloads the page – get FSW from Session (do not create new one)
You should create a worker role (service) for this type of thing. I think it is not appropriate to have something like this inside of a page.