C# - FileUpload Server Control And Unicode Characters?
Mar 15, 2011
I'm using the FileUpload server control to upload a HTML document previously saved(as webpage; filtered) from MS Word. The charset is windows-1252.The document has smart quotation marks(curly) as well as regular quotes. It also has some blank spaces(apparently) that when looked deeply are characters other than the normal TAB or SPACE.When capturing the file content in a StreamReader, those special characters are translated to question marks. I assume its because the default encoidng is UTF-8 and the file is Unicode.
I went ahead and created the StreamReader using Unicode encoding, then replacing all the unwanted characters with the correct ones(code that I actually found in stackoverflow). This seems to work....just that I cant convert the string back to UTF-8 to display it in a asp:literal.
The code is there, its supposed to work....but the output(ConvertToASCII) is unreadable.Please look below:
Also, as I said before, there are some more "transparent" characters that seem to correspond to where the word doc has numbering indentation that I have no idea how to capture their unicode value to replace them....so if you have any tips,
need information regarding how to use Unicode characters in ASP.NET in SDK and what are the data types to be used in it. I have come accross this concept for the first time..All I know id basically we want support for all languages that's why we have opted for Unicode support.
I want to create a page that can read extended characters in the QueryString. While this normally is not a problem, there is one case where I don't manage: when the QueryString is manually entered (or even pasted).
Here is a simple test-case:
[Code]....
This works fine both when clicking the hyperlink or submitting the form. However, when you enter the special characters manually in the URL, or in some browsers even when you just highlight the URL bar and click Enter to open the page, the characters will be mangled. (You may need to empty your cache or perform a forced refresh to see these results.
In Internet Explorer 8:
Clicking the hyperlink shows the characters unencoded in the URL bar. Submitting the form shows the characters double-byte encoded (for example, the first character "å" (small letter a with ring above, unicode position 0xA5) is encoded as %C3%A5 instead of just as %A5. In both cases, the output shows the correct characters.After clicking the hyperlink (which creates an URL with readable characters), clicking the URL bar to highlight the URL and pressing Enter to open the page, shows square boxes instead of the characters as output. Note that you may have force a reload of the page to see this. The same happens when you enter characters manually in the URL bar.Highlighting the URL bar and submitting the double-byte encoded URL (as it is created by the form) shows the output as it should.Manually entering single-byte encoded characters ("%A5%B8%A6") will again show boxes instead of characters.
I have a form that allows users to post text to a MySQL database using an OdbcConnection. Everything works great until a user entered unicode characters into the textbox and sends the data. Suddenly the page freezes and is not redirected to the next page as programmed. When I check the database later it comes up with all of the users data intact, including the unicode characters. I've duplicated this problem several times by entering unicode characters and then entering only ASCII. It happens every time unicode characters are used. Is the problem on the ASP.Net side or the MySQL side? Here is my code. The description string is from a textbox entered on the form.I thought about using a RegEx to get rid of any non-ascii characters before sending the data. Is that recommended? How do I do it?
How to get data (read file) chosen in FileUpload control without FileUpload.SaveAs Method on the server? Is it possible write it at once to some object?
I have a WebForm search page that gets occasional hits from international visitors. When they enter in text, it appears to be plain ASCII a-z, 0-9 but they are printed in bold and my "is this text" logic can't handle the input. Is there any easy way in ASP.NET to convert unicode characters that equate to A-Z, 0-9 into plain old text?
I need some help to figure out how to check if a file already exist in the db. My mind is froze. I am using sqlserver 2005, vb.net and vs 2008, not that matter for this quesiton, but in case if you deem necessary. I have an fileupload control and all I am trying is to check if the uploaded file already exist in my webserver or db. I am saving the file to the file directoy but I have the file name stored in the db. So I want to check the file name in the db for duplication. If it exisist I will not save the details. How do I do this.
Dim conn As New SqlConnection(resumeDatasource.ConnectionString) If Exists("select EmailAddress,IPAddress,fleName from Resume where fleName =" & " 'strflename'") Then MsgBox(" file already exisist", MsgBoxStyle.OkOnly) Exit Else MsgBox(" thank you for uploading your file", MsgBoxStyle.OkCancel) End If
I have a strange thing going on with the .net fileupload control. If I remote desktop to the server that houses the web app and db server, I am able to upload files and store them into a varbinary(max) column.
However, when clients connect to the web server from their desktop, then can do all the things they need to such as browsing web pages, fill out forms that store/save data to the database, etc.
However, when they try to upload a pdf to the sever, the following exception occurs: The web app uses .net 3.5, the db is sql 2005, and code is c#. And insights would be welcomed. Code and Exception below.
I have a FileUpload control in an UpdatePanel and when user select a file, the full file path will will be stored in a hiddenfield, and during postback, i would like to assign the full file path in the hiddenfield back to the FileUpload control textbox, possible to achieve that?
I am using Visual Studio 2008 and SQL Server 2005 as my back-end.I saw this topic is already introduced in StackOverflow but I have different question related to this topic.I just want to directly get the file from my server/hard-disk and save it in the database.
I'm trying to use an asp:FileUpload Control to allow users to upload files (.doc, .gif, .xls, .jpg) to a server that is outside of our DMZ and not the Web Server. We want to have the ability to look at these files for viruses, structure, etc prior to saving them into another directory that would allow access to outside users. From what I have read about this control is that it will allow for files to be uploaded to the web server. Can this control be used to upload files to a server other than the web server? If it can be done where should I look for this type of functionality or how do I force it to go to https:servernamefolder name (Where server name is not the web server)? Would I have to read the file then write it to the other server?
In continuation to my previous research at this link : Security Risks or concerns with the use of FileUpload control of asp.net - how to Scan files during upload, also how to intimate user if file is virus affected and abort the operation. In addition to above, we have McAfee Antivirus installed on our servers. I heard that there is some APIS for this work for Symantac Antivirus but I am not sure about McAfee antivirus.
Public Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate ' Get file name Dim uploadAvatar As FileUpload = DirectCast(AdvertisementForm.FindControl("uploadAvatar"), FileUpload) Dim UploadFileName As String = uploadAvatar.PostedFile.FileName If UploadFileName = "" Then ' There is no file selected args.IsValid = False Else Dim Extension As String = UploadFileName.Substring(UploadFileName.LastIndexOf(".") + 1).ToLower() If Extension = "xls" Or Extension = "xml" Then args.IsValid = True ' Valid file type Else args.IsValid = False ' Not valid file type End If End If End Sub <table> <div> <td><asp:FileUpload ID="uploadAvatar" runat="server" /></td> <td><asp:LinkButton ID="BtnUpdate" runat="server" CausesValidation="True" CommandName="Update" Text="Update" CssClass="updatebutton" OnClientClick="ValidateFileUpload();" /></td> <asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="ValidateFileUpload" ErrorMessage="Please select valid .jpg or .bmp file" ></asp:CustomValidator> <td><asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" CssClass="cancelbutton" /></td> </tr> </div> </table>
I use aspFileUpload server control to upload files in my web site. Every things work properly. But when my web site run from iis server, I can't upload files and The error is appear: The access denied. If i set modify permision to Everyone group i can upload file but i can't delete it from my web site.
