I am trying to read the file content from FileUpload control the following way
BinaryReader b = new BinaryReader(FileUpload1.PostedFile.InputStream);
byte[] binData = b.ReadBytes(FileUpload1.PostedFile.ContentLength);
I do not want to save the file to server, instead I wanted to get Byte array and
store it in database.
By doing the above it not only reads the contents of the file, but it also appends the html of the posted page. How do I get only the contents from the file.
Did you try to use FileBytes property?
Related
In my c# program, I have an image which is successfully stored in a byte[] data called bytes. I successfully write it into a .txt file using the following code
using (FileStream file = new FileStream("text.txt", FileMode.Create, FileAccess.Write))
{
file.Write(bytes, 0, numToWrite);
file.Close();
}
The above code stores the exact content I wish to store.
Whenever I wish to read the content of the file, text.txt, into textbox I only get the first line or little part of the first line. But when I open the file, text.txt, I see the complete content.
This is the code I use to read the file
string kk = File.ReadAllText("text.txt");
You have said at the start of the question that you have a byte[] that you are writing into the file. It's not clear why you decided not to use File.WriteAllBytes but let's assume that your code is correctly writing all the data into the file called "text.txt", which has been explained in comments does not magically make this a text file.
Using File.ReadAllText is not going to work because The data in the file is binary data, not text. As you can see from the remarks on the documentation, it will try to decide the encoding of the text file (which won't work because it contains binary data) and will do end of line processing which you won't want for a binary file.
The best way to read the data back is to use File.ReadAllBytes, which gives you back a byte[], just like you started with.
I am uploading an .mp3 file via FTP code using C#, the file is uploaded successfully on server but when i bind to a simple audio control or directly view in browser it does not work as expected, whereas when i upload manually on the server it works perfectly.
Code:
var inputStream = FileUpload1.PostedFile.InputStream;
byte[] fileBytes = new byte[inputStream.Length];
inputStream.Read(fileBytes, 0, fileBytes.Length);
Note: When i view the file in Firefox it shows MIME type is not supported.
Thanks!
You're reading the file as a string then using UTF8 encoding to turn it into bytes. If you do that, and the file contains any binary sequence that doesn't code to a valid UTF8 value, parts of the data stream will simply get discarded.
Instead, read it directly as bytes. Don't bother with the StreamReader. Call the Read() method on the underlying stream. Example:
var inputStream = FileUpload1.PostedFile.InputStream
byte[] fileBytes = new byte[inputStream.Length];
inputStream.Read(fileBytes, 0, fileStream.Length);
Im making this website,where the user has a form in which they can choose a file from their computer,and upload it, but i don't know how i can use it. I'm using MVC and a Web Service also in C# where im handling the connection to the Database,where I have to save the file.The file can be a pdf,word or an image.
So the question is,how can I save it and also check its size.Thank you
You can use the ContentLength property of HttpPostedFileBase to get the size of the file -
https://msdn.microsoft.com/en-us/library/system.web.httppostedfilebase.contentlength(v=vs.110).aspx
Then save the InputStream to a byte array
using (MemoryStream stream = new MemoryStream())
{
file.InputStream.CopyTo(stream);
bytes = stream.ToArray();
}
Next assign the byte array to a SqlDbType.VarBinary stored procedure parameter to save it back to the database - assuming this is SQL Server.
I am using a basic telerik export document to pdf function. this works great to export the page directly to the user. I then pass this to a controller as a string via datauri.
how can I convert it back to a file so that I can attach it to an email?
imageData: "data:application/pdf;base64,JVBERi0xLjQKJcLB2s/OCgoxIDAg...
I found a way to do this. replace a bit of the header, convert to byes, make a new stream, attach stream to email.
imageData = imageData.Replace("data:application/pdf;base64,", "");
byte[] bytes = Convert.FromBase64String(imageData);
Stream stream = new MemoryStream(bytes);
email.Attachments.AddFileAttachment("SALOR.pdf",stream);
i deployed a website on IIS running on localhost/xxx/xxx.aspx . On my WPF side , i download a textfile using webclient from the localhost server and save it at my wpf app folder
this is how i do it :
protected void DownloadData(string strFileUrlToDownload)
{
WebClient client = new WebClient();
byte[] myDataBuffer = client.DownloadData(strFileUrlToDownload);
MemoryStream storeStream = new MemoryStream();
storeStream.SetLength(myDataBuffer.Length);
storeStream.Write(myDataBuffer, 0 , (int)storeStream.Length);
storeStream.Flush();
string currentpath = System.IO.Directory.GetCurrentDirectory() + #"\Folder";
using (FileStream file = new FileStream(currentpath, FileMode.Create, System.IO.FileAccess.ReadWrite))
{
byte[] bytes = new byte[storeStream.Length];
storeStream.Read(bytes, 0, (int)storeStream.Length);
file.Write(myDataBuffer, 0, (int)storeStream.Length);
storeStream.Close();
}
//The below Getstring method to get data in raw format and manipulate it as per requirement
string download = Encoding.ASCII.GetString(myDataBuffer);
}
This is by writing btyes and saving them . But how do i download multiple image files and save it on my WPF app folder? I have a URL like this localhost/websitename/folder/designs/ , under this URL , there is many images , how do i download all of them ? and save it on WPF app folder?
Basically i want to download the contents of the folder whereby the contents are actually images.
First, the WebClient class already has a method for this. Use something like client.DownloadFile(remoteUrl, localFilePath).
See this link:
WebClient.DownloadFile Method (String, String)
Secondly, you will need to index the files you want to download on the server somehow. You can't just get a directory listing over HTTP and then loop through it. The web server will need to be configured to enable directory listing, or you will need a page to generate a directory listing. Then you will need to download the results of that page as a string using WebClient.DownloadString and parse it. A simple solution would be an aspx page that outputs a plaintext list of files in the directory you want to download.
Finally, in the code you posted you're saving every single file you download as a file named "Folder". You need to generate a unique filename for each file you want to download. When you're looping through the files you want to download, use something like:
string localFilePath = Path.Combine("MyDownloadFolder", imageName);
where imageName is a unique filename (with file extension) for that file.