ioexception | 易学教程

Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host in C#

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问题 I have a code where I am sending the URL request and receiving the response and storing it as a String as public String GenerateXML(String q)// Here 'q' is the URL { // Generating the XML file for reference // Getting the response in XML format from the URL Debug.WriteLine("The Http URL after URL encoding :" + q); try { Uri signs1 = new Uri(q); //Debug.WriteLine("The Requested URL for getting the XML data :" + re); WebRequest request1 = WebRequest.Create(signs1); HttpWebResponse response1 =

File.Move and File.Copy gives IOException Logon failure

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问题 I'm writing an add-in for a fujitsu scanner in C#. Documents are scanned to a local directory, and I wanted to copy them to a pc on the network. I keep getting System.IO.IOException: Logon failure: unknown user name or bad password though. I tried copying them to a public directory (at least I think its public), and I still get the same result. Any ideas for stuff I could try? I don't think my code here is the issue, but here it is anyway. private bool moveTheFile(String source, String

IO Exception - read end dead - what causes it in this example and how to fix it - multithread application in Java

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问题 This is an extension of my question posted here, while that seems to have fixed one part of my problem, now I see IO-Exception read end dead exception . I am using a multithreaded application where thread-1 produces random numbers and other thread-2 consumes it to calculate the average. once the average reaches a threshold, I signal thread-1 to stop producing the numbers. This is the basic design of the code. I am getting IO-Exception read end dead exception . I want to know why it comes and

System.IO.File.Delete() / System.IO.File.Move() sometimes does not work

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问题 A Winforms program needs to save some run time information to an XML file. The file can sometimes be a couple of hundred kilobytes in size. During beta testing we found some users would not hesitate to terminate processes seemingly at random and occasionally causing the file to be half written and therefore corrupted. As such, we changed the algorithm to save to a temp file and then to delete the real file and do a move. Our code currently looks like this.. private void Save() { XmlTextWriter

runtime code compilation gives error - process cannot access the file

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问题 I hava small windows app where user enter code and on button click event code is compiled at runtime. When i click button 1st time it works fine but if click same button more than once it gives error "The process cannot access the Exmaple.pdb file because it is being used by another process." . Below is the example sample code using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using Microsoft.CSharp; using System.CodeDom.Compiler; using System

java.io.IOException: Unable to open sync connection! in to the Nexus [duplicate]

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问题 This question already has answers here : Android adb “Unable to open sync connection!” (18 answers) Closed 6 years ago . I try my application run on eclipse but i found these errors. which is faced first time so would you please give me any ideas for these error. i am currently using Nexus mobile. [2011-08-04 15:59:09 - App] Android Launch! [2011-08-04 15:59:09 - App] adb is running normally. [2011-08-04 15:59:09 - App] Performing com.horror.android.AppActivity activity launch [2011-08-04 15

Android nfcv.transceive() throws an exception

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I wrote an Android app that uses the transceive() function to communicate with an NFC-V card. My problem is that line byte[] response = nfcv.transceive(command) always throws a tag lost exception. Could someone help me? String action = intent.getAction(); Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); NfcV nfcv = NfcV.get(tag); if(nfcv != null) { Toast.makeText(this, "nfcv detected", Toast.LENGTH_LONG).show(); } try { nfcv.connect(); Toast.makeText(this, "connected", Toast.LENGTH_LONG).show(); byte[] command = new byte[]{ (byte) 0x00, // Flags (byte) 0x20, // Command: Read single

Why should I access a url using a User Agent?

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I had a similar code as in this question . Extending the code, in accepted answer, worked for me too. Before this time, I used this type of codes and never meet any exception. Now, my questions are: Why should I use the USER AGENT? Why it became necessary to use in my program? Is it necessary to use in every program? If yes, how my program ran so good before? If no, why I have to handle this now? How the string "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)" is generated? (I want to know the exact formatting). Note that : The program where I fixed it, I use it daily, but it never had any

Reading a txt file and outputing as a TextView in Android

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问题 I am trying to read a text file that is already saved in my directory and print it on the screen as a TextView. This is the code that I have so far. However, when I run the application, it creates a toast which says "Error Reading File". What am I doing wrong here? public class sub extends Activity { private TextView text; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.text); //text = (TextView) findViewById(R.id.summtext); /

Resolving IOException, FileNotFoundException when using FileReader

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问题 I've not been able to resolve the following exception in the code below. What is the problem with the way I use BufferedReader? I'm using BufferedReader inside the main method OUTPUT :- ParseFileName.java:56: unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown BufferedReader buffread = new BufferedReader (new FileReader("file.txt")); // ParseFileName is used to get the file name from a file path // For eg: get - crc.v from "$ROOT/rtl/..path/crc.v"