I'd like to understand what happen under the hood when you do an web upload. I guess one of these: The file is loaded in memory by the browser, sent to the web server buffer memory, and then the app is notified to collect it. The file is being readed by the browser and at the same time sent to the web server, that can start to save the bytes progresively. I've tried to upload a very large file, and put a breakpoint on the frist line of the method receiving the upload. I've seen how the browser toke a lot of time loading... but the breakpoint was still not hit, and after a while the breakpoint is hit. I want to understand this, because in the worst scenario, if I allow big uploads, they could blow up the server memory at some point. What does happen if I upload a 2Gb file? (considering that the web server/app accepts that length) would it take 2Gb of server memory?
function btn_AddToList_Click() { var filePath = document.getElementById("FileUpload").value; if(filePath.length > 0) { var opt = new Option(filePath,filePath); var listBox = document.getElementById("ListBox"); listBox.options[listBox.options.length] = opt; } }
I'm trying to upload a file to an ASP 2.0 web service through HTTP 1.1 POST from a client-side application. If my web service function is declared as
<WebMethod()> Public Function UploadFile(ByVal file as Byte(), ByVal fileName as String) as String ...
The test form says the request should take this form:
POST address_of_service HTTP/1.1 Host: <host> Content-Type: application/x-www-form-urlencoded Content-Length: length file=string&file=string&fileName=string
How do I get my binary file data into that form? I've tried just converting the file data to a string and putting it in the body (file=<string_data_here>) but I get HTTP 500 errors back, complaining about not being able to convert it to System.Byte. I've got HTTP POST working fine elsewhere in my application with plain string parameters. Also, out of curiosity, why is it showing the file parameter twice?
In my current project, my client application first talk with the server and the server returned an upload url for me to upload a file, the url looks like this: [URL] Then I want to use HTTP PUT method to upload the local "c:pesult.cab" to the above loacation. How could I do this? And could anyone give me a detailed description about the whole uploading mechanism? When I use a ASP.NET upload control, I just click the browse button to locate my file and click submit, and on the server side, I just call the SaveAs() method of the upload control. Here is some code:
protected void UploadButton_Click(object sender, EventArgs e) { if(FileUploadControl.HasFile) { try { string filename = Path.GetFileName(FileUploadControl.FileName); FileUploadControl.SaveAs(Server.MapPath("~/") + filename); StatusLabel.Text = "Upload status: File uploaded!"; } catch (Exception ex) { StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message; } } }
Who is responsible for reading the file and sending it? What happens when I call FileUploadControl.SaveAs() method? Does the server pull the file from client, or the client push the file to the server? I know HTTP is text based, but my result.cab is not text, so is it Base64 encoded before being sent? How does HTTP PUT method work? Is it a client side push, or a server side pull? Or interaction of both like some kind of handshake?
Could someone please tell me/link me to how I could create a method similar to those posted below: [URL] (I am providing the links as I'm not sure how to articulate this question without them!) I'm using C# ASP.NET. IIS 6. I have an existing web server with other public API methods. I do not want the iPhone user to have to open a web browser, and post to an aspx page. I want the iPhone developer to be able to call my method, and have one of the parameters be a handle to the file which gets POSTed.
I'm using a slightly modified version of Valum's upload [github link], I've modified it to upload to a database but haven't modified the javascript that it is using to get the file into the Request as an InputStream. The following line of code is failing in IE 8 but is confirmed to work in Chrome. using (Image imgInput = Image.FromStream(Request.InputStream)) The error received is "Parameter not valid". It appears to be having an issue with the Input Stream being used but it exists/has data (not sure how to validate if the data is good or not).
Page <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Upload-Pictures</h2> <div id="file-uploader"> <noscript> <p>Please enable JavaScript to use file uploader.</p> </noscript> </div> <script src="/Scripts/fileuploader.js" type="text/javascript"></script> <script type="text/javascript"> function createUploader() { var uploader = new qq.FileUploader({ element: document.getElementById('file-uploader'), action: '/Admin/FileUpload/' + <%= Model.PropertyId %>, debug: true }); } window.onload = createUploader; </script> </asp:Content> Controller [AcceptVerbs(HttpVerbs.Post)] public JsonResult FileUpload(int id) { try { byte[] newImageByteArray = GetByteArrayForResizedImage(350, Request.InputStream); byte[] thumbnailByteArray = GetByteArrayForResizedImage(150, Request.InputStream); //Add to DB } catch (Exception ex) { // This is where the exception is caught return Json(new { success = false, message = ex.Message }, "application/json"); } return Json(new { success = true }, "application/json"); } private static byte[] GetByteArrayForResizedImage(int imageSize, Stream inputStream) { byte[] imageByteArray; // For some reason in IE the inputStream here is causing it to crash using (Image imgInput = Image.FromStream(inputStream)) { //Image processing } return imageByteArray; } fileuploader.js - qq.FileUploader /** * Class that creates upload widget with drag-and-drop and file list * @inherits qq.FileUploaderBasic */ qq.FileUploader = function(o){ // call parent constructor qq.FileUploaderBasic.apply(this, arguments); // additional options qq.extend(this._options, { element: null, // if set, will be used instead of qq-upload-list in template listElement: null, template: '<div class="qq-uploader">' + '<div class="qq-upload-drop-area"><span>Drop files here to upload</span></div>' + '<div class="qq-upload-button">Upload a file</div>' + '<ul class="qq-upload-list"></ul>' + '</div>', // template for one item in file list fileTemplate: '<li>' + '<span class="qq-upload-file"></span>' + '<span class="qq-upload-spinner"></span>' + '<span class="qq-upload-size"></span>' + '<a class="qq-upload-cancel" href="#">Cancel</a>' + '<span class="qq-upload-failed-text">Failed</span>' + '</li>', classes: { // used to get elements from templates button: 'qq-upload-button', drop: 'qq-upload-drop-area', dropActive: 'qq-upload-drop-area-active', list: 'qq-upload-list', file: 'qq-upload-file', spinner: 'qq-upload-spinner', size: 'qq-upload-size', cancel: 'qq-upload-cancel', // added to list item when upload completes // used in css to hide progress spinner success: 'qq-upload-success', fail: 'qq-upload-fail' } }); // overwrite options with user supplied qq.extend(this._options, o); this._element = this._options.element; this._element.innerHTML = this._options.template; this._listElement = this._options.listElement || this._find(this._element, 'list'); this._classes = this._options.classes; this._button = this._createUploadButton(this._find(this._element, 'button')); this._bindCancelEvent(); this._setupDragDrop(); }; fileuploader.js - qq.FileUploaderBasic /** * Creates upload button, validates upload, but doesn't create file list or dd. */ qq.FileUploaderBasic = function(o){ this._options = { // set to true to see the server response debug: false, action: '/server/upload', params: {}, button: null, multiple: true, maxConnections: 3, // validation allowedExtensions: [], sizeLimit: 0, minSizeLimit: 0, // events // return false to cancel submit onSubmit: function(id, fileName){}, onProgress: function(id, fileName, loaded, total){}, onComplete: function(id, fileName, responseJSON){}, onCancel: function(id, fileName){}, // messages messages: { typeError: "{file} has invalid extension. Only {extensions} are allowed.", sizeError: "{file} is too large, maximum file size is {sizeLimit}.", minSizeError: "{file} is too small, minimum file size is {minSizeLimit}.", emptyError: "{file} is empty, please select files again without it.", onLeave: "The files are being uploaded, if you leave now the upload will be cancelled." }, showMessage: function(message){ alert(message); } }; qq.extend(this._options, o); // number of files being uploaded this._filesInProgress = 0; this._handler = this._createUploadHandler(); if (this._options.button){ this._button = this._createUploadButton(this._options.button); } this._preventLeaveInProgress(); };
Currently i am having an UploadFile action result that is working.
My form looks like that:[Code]....
If i select a file with "file1" input and i press the "submit" button, the file is "found" and saved in code-behind file.My "showUpload" javascript function looks like that:[Code]....
It is triggering the same UploadFile Action result, but it doesn't find any file [:(] Here is my ActionResult script
[Code]....
So, if i am selecting file and i press "submit" button, Request.Files has 1 file, but if i press the standard "upload file" button, Request.Files has 0 files
I am using the async file upload control to upload to a image file. I want the user to upload only jpg files. And for that I am checking the uploadedfile content type in server side, after the upload complets. I wanna check this, before upload starts. There is one javascript method
function startUpload(sender, args){}
but how to access the content type of the file selected by user.
problem with Stream.Write() where it works under a dev (Windows 7) environment but fails under a server environment (Windows 2008 R2 Enterprise)?
I'm basically working with some third party code which reads from a FileStream and writing to an Http request, nothing unusual and it's doing the following things:
Ensuring that Response.KeepAlive is false (was originally true but worked W7 and not W2K8 so tried false but it doesn't ); Ensuring that the Write includes the length of the bytes to write; Ensuring that I Flush the stream afterwards;
The error that I encounter is the rather vague 'The request was aborted: The request was canceled.' with InnerException of 'Cannot close stream until all bytes are written.'. Now, my code works perfectly under Windows 7 so I still suspect that something is actively blocking this writing although I am not sure what, how and where.
One other possibility I wondered about was whether the encoding might be different under Windows Server 2008 R2 as opposed to Windows 7?
Here's a code snippet from the relevant method (a bit convoluted but, disclaimer, I didn't write it :-):
I am trying to build a form in asp.net 1.1, the problem I am facing is when I run the page on http everything works fine, but on https it submits the page with out any validation on client side. The page supposed to validate fields which it does on http but not https.
Page works in all other browsers. FF,chrome,safari,ie6, ie7, the problem is only in IE8 and only when the page moves to https.
I want to upload files to the web servers from the client machines.
Can i upload a file on a network share folder using file upload control?
I would like to create a share folder on a file server sitting next to the web server. If i upload the file from the network share folder instead of uploading it from the client machine does it make any difference?
Will the file be stored in a temporary location before copying to the final destination? Where will be the file stored in this case of uploading it from share folder?
As soon as compiler execute this statement i get error
" [System.Threading.ThreadAbortException] = {Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.} "
What will be the possible reasons for the error.
Although it throws execption but it will allow to convert report when i deployed my site using http but when i deployed my site using https then it will shows error .
I have a website with a button.Everytime I press that button I want to multiply the number I have in the database by one.It works perfectly offline, but as soon as i upload it i get this error:
Code: protected void btnthumbdown_Click(object sender, ImageClickEventArgs e) { int countdown = 1; countdown += Convert.ToInt16(lblcountthumbdown.Text); OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("App_Data/DataBase_J_Wall.mdb")); con.Open(); OleDbCommand cmd2 = new OleDbCommand("update MAIN_TBL set Person_Thumbs_Down='" + countdown + "' where Person_Email='" + lblemail.Text + "'", con); cmd2.ExecuteNonQuery(); con.Close(); Response.Redirect(Request.Url.ToString()); }
I have a problem with upload a picture from desktop to a folder on server. The problem is that it seems to work about 1 of 10 times wich confuses me. Perheps something with this code is not enterily correct ?
First I check for if Pic1.jpg or Pic1.gif exists and then delete it if it exist. Then I want the uploaded picture to be named the same. Pic1.jpg if it is .jpg format or Pic1.gif if the uploaded picture has a .gif format.
I have a page which uploads a file from server A to server B. The user first uploads the file to server A, where it's saved into a diretory, then once the file is safely stored there, I'm transferring it to a second server, server B, using the following code:
[code]....
So, in summary, the only difference I can see between the working case and the non-working case is the server that'ssending the file.
i have problem in uploading 2gb video file using file upload control in asp.net, i have limit the maximum file size in web config file then also it shows error any remedy for that...
Im using a file uploader to upoad files to a folder used for upload.But the problem is this folder is a linux folder. I have made it a shared folder so that I can access from windows by samba. So, file transfer is successful when I'm using os but when I try to upload something from my websites uploader to this folder, this process is not successful. I have given all permissions to this folder.Don't know whats the problem.I have used both type of slashes for directory but still it is not successful.
