var sdcardpath = Android.OS.Environment.ExternalStorageDirectory.Path;
var filepath = System.IO.Path.Combine(sdcardpath, "first.html");
System.IO.StreamWriter writer = new StreamWriter(filepath, true);
if (!System.IO.File.Exists(filepath))
{
writer.Write(htmltext);
}
else
{
var txt = System.IO.File.ReadAllText(filepath);
}
In This Way I want to read an html from my local storage But while readalltext am getting exception
System.IO.IOException: Sharing violation on path /storage/emulated/0/first.html
When you do this
System.IO.StreamWriter writer = new StreamWriter(filepath, true);
it opens/creates a file at filepath. So after this the file always exists (given the path is correct and permissions allow). Then you try to read it but you have it open for writing so this will not be allowed.
If you're trying to see if the file exists and if not, write to it, then move the StreamWriter creation inside the check
if (!System.IO.File.Exists(filepath))
{
using (var writer = new StreamWriter(filepath, true))
{
writer.Write(htmltext);
}
}
else
{
var txt = System.IO.File.ReadAllText(filepath);
}
Related
So currently I got a text file in a shared folder on my PC and I want to access it from android Phone.
Here is the code I'm using but it's not finding the file.
void ReadFile()
{
TextView file = FindViewById<TextView>(Resource.Id.fileview);
string filepath = #"\\192.168.8.102\Sharedtest\test.txt";
if (!File.Exists(filepath))
{
file.Text = "No File Found";
}
else
{
foreach (string line in File.ReadLines(filepath, Encoding.UTF8))
{
file.Text = $"{line}\n";
}
}
}
File is shared and no firewall.
If someone can just point me in a direction that would be great.
I don't want to download file I just want to read content.
You can use FileStream with FileMode.Open. check Microsoft doc.
using (FileStream fs = File.Open(path, FileMode.Open))
{
byte[] b = new byte[1024];
UTF8Encoding temp = new UTF8Encoding(true);
while (fs.Read(b, 0, b.Length) > 0)
{
file.Text = temp.GetString(b);
}
}
I am doing a project Windows form for assignment in Uni, I want to search an already created text file to match a first name and last name then write some additional information if the name and last name exist. I have the code constructed and showing no errors, however when I run and attempt to add information I am being provided with an error which essentially says the next process (Streamreader writer can not access the file as it is already in use by another process) I assume this process is streamreader, I have tried to code it to stop reading to no avail. I am in my first 3 months learning coding and would appreciate some assistance if possible, I have put a snippet of my code below.
//check if there is a file with that name
if (File.Exists(sFile))
{
using (StreamReader sr = new StreamReader(sFile))
{
//while there is more data to read
while (sr.Peek() != -1)
{
//read first name and last name
sFirstName = sr.ReadLine();
sLastName = sr.ReadLine();
}
{
//does this name match?
if (sFirstName + sLastName == txtSearchName.Text)
sr.Close();
}
//Process write to file
using (StreamWriter sw = new StreamWriter(sFile, true))
{
sw.WriteLine("First Name:" + sFirstName);
sw.WriteLine("Last Name:" + sLastName);
sw.WriteLine("Gender:" + sGender);
}
You are using your writer inside the reader, using the same file.
A using disposes the object inside it, after the closing curly braces.
using(StreamReader reader = new StreamReader("foo")){
//... some stuff
using(Streamwriter writer = new StreamWriter("foo")){
}
}
Do it like so :
using(StreamReader reader = new StreamReader("foo")){
//... some stuff
}
using(Streamwriter writer = new StreamWriter("foo")){
}
As per my comment regarding the using statement.
Rearrange to the below. I've tested locally and it seems to work.
using (StreamReader sr = new StreamReader(sfile))
{
//while there is more data to read
while (sr.Peek() != -1)
{
//read first name and last name
sFirstName = sr.ReadLine();
sLastName = sr.ReadLine();
//does this name match?
if (sFirstName + sLastName == txtSearchName.Text)
break;
}
}
using (StreamWriter sw = new StreamWriter(sfile, true))
{
sw.WriteLine("First Name:" + sFirstName);
sw.WriteLine("Last Name:" + sLastName);
sw.WriteLine("Gender:" + sGender);
}
I've replaced the sr.Close with a break statement to exit out. Closing the reader causes the subsequent peek to error as it's closed.
Also, I've noticed that you are not setting gender? unless its set elsewhere.
hope that helps
You can use FileStream. It gives you many options to work with file:
var fileStream = new FileStream("FileName", FileMode.Open,
FileAccess.Write, FileShare.ReadWrite);
var fileStream = new FileStream("fileName", FileMode.Open,
FileAccess.ReadWrite, FileShare.ReadWrite);
I think this is what you want/need. You can't append to a file the way you are trying to do it. Instead you'll want to read your input file, and write a temp file as you are reading through. And, whenever your line matches your requirements, then you can write the line with your modifications.
string inputFile = "C:\\temp\\StreamWriterSample.txt";
string tempFile = "C:\\temp\\StreamWriterSampleTemp.txt";
using (StreamWriter sw = new StreamWriter(tempFile))//get a writer ready
{
using (StreamReader sr = new StreamReader(inputFile))//get a reader ready
{
string currentLine = string.Empty;
while ((currentLine = sr.ReadLine()) != null)
{
if (currentLine.Contains("Clients"))
{
sw.WriteLine(currentLine + " modified");
}
else
{
sw.WriteLine(currentLine);
}
}
}
}
//now lets crush the old file with the new file
File.Copy(tempFile, inputFile, true);
I upload a csv file to AppData folder in project solution and read the content with the code below:
using (var fs = new FileStream(Path.Combine(uploadPath, name), chunk == 0 ? FileMode.Create : FileMode.Append))
{
var buffer = new byte[fileUpload.InputStream.Length];
fileUpload.InputStream.Read(buffer, 0, buffer.Length);
fs.Write(buffer, 0, buffer.Length);
var reader = new StreamReader(System.IO.File.OpenRead(fs.Name));// I check path and file itself in AppData folder. its ok
List<string> listA = new List<string>();
List<string> listB = new List<string>();
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
var values = line.Split(';');
}
But it throws IOException with message:
The process cannot access the file 'c:\path\App_Data\o_1amtdiagc18991ndq1c1k1c2v1bama.csv'
because it is being used by another process.
I couldnt get it how and why it's being used I created this file from original uploaded file with unique name..
I couldnt get it how and why its being used
Because you've not closed the stream that's writing to it:
using (var fs = new FileStream(Path.Combine(uploadPath, name), ...)
I would suggest you write the file, close the using statement so the handle can be released, then read it:
string fullName = Path.Combine(uploadPath, name);
using (var fs = ...)
{
// Code as before, but ideally taking note of the return value
// of Stream.Read, that you're currently ignoring. Consider
// using Stream.CopyTo
}
// Now the file will be closed
using (var reader = File.OpenText(fullName))
{
// Read here
}
I am trying to separate the MIME gui from the code i need. I am almost there just one more gui element i dont know how to replace. This element is the openfiledialog. Here a code snippet.
Program.cs
var sfd = new OpenFileDialog();
sfd.FileName = "C:\\eml\\" + validOutputFilename;
try
{
var writer = new MimeMessageWriter();
using (var fs = sfd.OpenFile()) writer.Write(message, fs);
}
catch (Exception ex)
{
//ignore
// need to log
}
message is an IMessage. A class created to store the information about an eml file. The open file dialog is allowing you to put in the file name with an eml extension and that is all. write.Write expects an IMessage and a stream. Inside writer.Write the file is being written The only part of the file that uses this code is when the file itself is writen at the end and write out any attachments. Here are those code snippets.
*MimeMessageWriter
-the attachment uses it here
var embeddedMessage = attachment.OpenAsMessage();
var messageWriter = new MimeMessageWriter();
var msgStream = new MemoryStream();
messageWriter.Write(embeddedMessage, msgStream);
var messageAttachment = ew DotNetOpenMail.FileAttachment(msgStream.ToArray());
messageAttachment.ContentType = "message/rfc822";
messageAttachment.FileName = filename + ".eml";
outMessage.AddMixedAttachment(messageAttachment);
-write out the file part of the file
using (var sw = new StreamWriter(stream))
sw.Write(outMessage.ToDataString());
I want to replace openFileDialog with something that will allow me to pass the filename to write out file in the MimeMessageWriter
Replace
using (var fs = sfd.OpenFile()) writer.Write(message, fs);
with
string fileName = #"c:\eml\myAttachment.eml";
using ( FileStream fs = new FileStream( fileName, FileMode.CreateNew ) )
{
writer.Write( message, fs )
}
See also: http://msdn.microsoft.com/de-de/library/47ek66wy.aspx
What I have:
A large XML file # nearly 1 million lines worth of content. Example of content:
<etc35yh3 etc="numbers" etc234="a" etc345="date"><something><some more something></some more something></something></etc123>
<etc123 etc="numbers" etc234="a" etc345="date"><something><some more something></some more something></something></etc123>
<etc15y etc="numbers" etc234="a" etc345="date"><something><some more something></some more something></something></etc123>
^ repeat that by 900k or so lines (content changing of course)
What I need:
Search the XML file for "<etc123". Once found move (write) that line along with all lines below it to a separate XML file.
Would it be advisable to use a method such as File.ReadAllLines for the search portion? What would you all recommend for the writing portion. Line by line is not an option as far as I can tell as it would take much too long.
To quite literaly discard the content above your search string, I would not use File.ReadAllLines, as it would load the entire file into memory. Try File.Open and wrap it in a StreamReader. Loop on StreamReader.ReadLine, then start writing to a new StreamWriter, or do a byte copy on the underlying filestream.
An example of how to do so with StreamWriter/StreamReader alone is listed below.
//load the input file
//open with read and sharing
using (FileStream fsInput = new FileStream("input.txt",
FileMode.Open, FileAccess.Read, FileShare.Read))
{
//use streamreader to search for start
var srInput = new StreamReader(fsInput);
string searchString = "two";
string cSearch = null;
bool found = false;
while ((cSearch = srInput.ReadLine()) != null)
{
if (cSearch.StartsWith(searchString, StringComparison.CurrentCultureIgnoreCase)
{
found = true;
break;
}
}
if (!found)
throw new Exception("Searched string not found.");
//we have the data, write to a new file
using (StreamWriter sw = new StreamWriter(
new FileStream("out.txt", FileMode.OpenOrCreate, //create or overwrite
FileAccess.Write, FileShare.None))) // write only, no sharing
{
//write the line that we found in the search
sw.WriteLine(cSearch);
string cline = null;
while ((cline = srInput.ReadLine()) != null)
sw.WriteLine(cline);
}
}
//both files are closed and complete
You can copy with LINQ2XML
XElement doc=XElement.Load("yourXML.xml");
XDocument newDoc=new XDocument();
foreach(XElement elm in doc.DescendantsAndSelf("etc123"))
{
newDoc.Add(elm);
}
newDoc.Save("yourOutputXML.xml");
You could do one line at a time... Would not use read to end if checking contents of each line.
FileInfo file = new FileInfo("MyHugeXML.xml");
FileInfo outFile = new FileInfo("ResultFile.xml");
using(FileStream write = outFile.Create())
using(StreamReader sr = file.OpenRead())
{
bool foundit = false;
string line;
while((line = sr.ReadLine()) != null)
{
if(foundit)
{
write.WriteLine(line);
}
else if (line.Contains("<etc123"))
{
foundit = true;
}
}
}
Please note, this method may not produce valid XML, given your requirements.