I am trying to open my bitcoin-qt wallet with bitcoinj. I have this simple code:
private static final File WALLET_FILE = new File("__PATH__");
public static void main(String[] args) {
Wallet wallet;
try {
wallet = Wallet.loadFromFile(WALLET_FILE);
} catch (IOException e) {
System.out.println("Couldn't open wallet: " + e);
return;
}
System.out.println("Balance: " + wallet.getBalance());
}
I get an error:
Couldn't open wallet: com.google.protobuf.InvalidProtocolBufferException: Protocol message contained an invalid tag (zero).
I check the status on bitcoin-qt and my wallet seems synchronize.
I am far from an expert in bitcoin, but I wonder if you know the solution.
apparently this is not possible, I asked the question on bitcoin stackechange and they told me it is not the same format:
https://bitcoin.stackexchange.com/questions/8463/open-bitcoin-qt-wallet-with-bitcoinj/8466?noredirect=1#8466
Related
I am using NACChannel of JPOS v2.1.0. I am using GenericPackager for packing my message. I am able to successfully send message to my ISO application. But while receiving incoming message my NACChannel.receive() throws parsing error.
My incoming message has a custom Header. I suspect this is causing the parsing error. So my questions are:
How can I handle this ISOMsg header in my incoming response?
Is there any way I can disable the Parsing Step and Receive the byte[] response from the channel?
My JPOS client code I am using:
public class BuildISOMessage {
public static void main(String[] args) throws IOException, ISOException {
createISOMessage();
}
public static byte[] createISOMessage() throws ISOException {
String HOST = "localhost";
int PORT = 40021;
// Create Packager based on XML that contain DE type
ISOBasePackager packager = new GenericPackager("800_fields.xml");
NACChannel testchannel = new NACChannel();
testchannel.setHost(HOST, PORT);
ISOMsg isoMsg = build200ISOMessage(packager);
// print the DE list
logISOMsg(isoMsg);
// Get and print the output result
byte[] data = isoMsg.pack();
try {
testchannel.setPackager(isoMsg.getPackager());
testchannel.setHeader(("ISO01" + String.format("%04d", data.length)).getBytes());
testchannel.connect();
testchannel.send(isoMsg);
if (testchannel.isConnected()) {
ISOMsg response = testchannel.receive();
}
testchannel.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
return data;
}
private static ISOMsg build200ISOMessage(ISOBasePackager packager)
throws ISOException {
// Create ISO Message
ISOMsg isoMsg = new ISOMsg();
isoMsg.setPackager(packager);
isoMsg.setMTI("200");
isoMsg.set(2, "4622871000060891");
isoMsg.set(3, "300000");
isoMsg.set(4, "100");
isoMsg.set(7, "1026043633");
isoMsg.set(11, "999901");
isoMsg.set(12, "113633");
isoMsg.set(13, "1026");
isoMsg.set(15, "1116");
isoMsg.set(16, "1116");
isoMsg.set(18, "6011");
isoMsg.set(22, "21");
isoMsg.set(32, "0000004");
isoMsg.set(33, "0000004");
isoMsg.set(35, "4622871000060891=22082211963393100000");
isoMsg.set(37, "829911364035");
isoMsg.set(43, "TBNKTAS2B065B999P999300501000050 TH");
isoMsg.set(48, "00000000040000000002000000013000000000005000000000007000TYRIONLANNISER ARYA STARK000000003334000000000202 00000000000000000000");
isoMsg.set(49, "764");
isoMsg.set(52, "FFFFFFFFFFFFFFFF");
isoMsg.set(62, "221000000000");
return isoMsg;
}
private static void logISOMsg(ISOMsg msg) {
System.out.println("----ISO MESSAGE-----");
try {
System.out.println(" MTI : " + msg.getMTI());
for (int i = 1; i <= msg.getMaxField(); i++) {
if (msg.hasField(i)) {
System.out.println(" Field-" + i + " : "
+ msg.getString(i));
}
}
} catch (ISOException e) {
e.printStackTrace();
} finally {
System.out.println("--------------------");
}
}
}
Thanks all for your help.
While looking for an answer for debug purpose, I created a subclass of NACChannel and put some debug statements. By doing that I realized the issue was with my field definition and nothing to do with JPOS framework.
I was setting a header(e.g. ISO010200 where message length is 200) of length '9' by the below code.
testchannel.setHeader(("ISO01" + String.format("%04d", data.length)).getBytes());
My response also had a similar header of length '9'.
So the NACChanel receive() method was able to extract the 9 digit Header correctly.
But failed to parse the response message, my field definition was not correct.
Once that was fixed, JPOS was able to parse the response message coorectly.
This is my first time ask question through this platform. I am sorry. I am not good in English. I will try my best to let you understand my questions.
I am totally beginner in Netty. I would like to implement a program to send commands to a telnet server and receive response message. I modified the sample telnet program to connect and get response from the serve when there is no authentication of serve.
The question is that
When the authentication processes are setup in server. (Require login name and password)
How to implement the client side program?
How can I receive the serve login request and response it?
Should I implement another handler to handle the authentication?
below shows how i send the commands to the server
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.handler(new TelnetClientInitializer(sslCtx));
// Start the connection attempt.
ChannelFuture lastWriteFuture = null;
lastWriteFuture = b.connect(HOST, PORT).sync();
Channel ch = lastWriteFuture.channel();
lastWriteFuture = ch.writeAndFlush("ls" + "\r\n", ch.newPromise());
lastWriteFuture = ch.writeAndFlush("status" + "\r\n");
lastWriteFuture = ch.writeAndFlush("ls" + "\r\n");
lastWriteFuture = ch.writeAndFlush("exit" + "\r\n");
// Wait until the connection is closed.
lastWriteFuture.channel().closeFuture().sync();
} finally {
// Shut down the event loop to terminate all threads.
group.shutdownGracefully();
}
but what should i do before send the above commands to login into the serve?
The following picture shows what i want to do in the program
Thank you very much!!!
If we talk about TELNET as a protocol you should know that Telnet client from Netty examples does not support TELNET protocol. His name is just confusing and you can't connect to any standard telnet servers. You can read more about TELNET protocol here - THE TELNET PROTOCOL .
I see 2 ways:
write your implementation for TELNET on Netty
use another implementation for examples Apache Commons Net
Example for the first way - modified netty client, i tested him on Linux servers. He has several dirty hacks like a timer but he works.
Example for the second - Java – Writing An Automated Telnet Client:
import org.apache.commons.net.telnet.*;
import java.io.InputStream;
import java.io.PrintStream;
public class AutomatedTelnetClient {
private TelnetClient telnet = new TelnetClient();
private InputStream in;
private PrintStream out;
private String prompt = "~>";
public AutomatedTelnetClient(String server) {
try {
// Connect to the specified server
telnet.connect(server, 8023);
TerminalTypeOptionHandler ttopt = new TerminalTypeOptionHandler("VT100", false, false, true, false);
EchoOptionHandler echoopt = new EchoOptionHandler(true, false, true, false);
SuppressGAOptionHandler gaopt = new SuppressGAOptionHandler(true, true, true, true);
try {
telnet.addOptionHandler(ttopt);
telnet.addOptionHandler(echoopt);
telnet.addOptionHandler(gaopt);
} catch (InvalidTelnetOptionException e) {
System.err.println("Error registering option handlers: " + e.getMessage());
}
// Get input and output stream references
in = telnet.getInputStream();
out = new PrintStream(telnet.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
}
}
// public void su(String password) {
// try {
// write(“su”);
// readUntil(“Password: “);
// write(password);
// prompt = “#”;
// readUntil(prompt + ” “);
// } catch (Exception e) {
// e.printStackTrace();
// }
// }
public String readUntil(String pattern) {
try {
char lastChar = pattern.charAt(pattern.length() - 1);
StringBuffer sb = new StringBuffer();
boolean found = false;
char ch = (char) in.read();
while (true) {
System.out.print(ch);
sb.append(ch);
if (ch == lastChar) {
if (sb.toString().endsWith(pattern)) {
return sb.toString();
}
}
ch = (char) in.read();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public void write(String value) {
try {
out.println(value);
out.flush();
System.out.println(value);
} catch (Exception e) {
e.printStackTrace();
}
}
public String sendCommand(String command) {
try {
write(command);
return readUntil(prompt + " ");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public void disconnect() {
try {
telnet.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String user = "test";
String password = "test";
AutomatedTelnetClient telnet = new AutomatedTelnetClient("localhost");
// Log the user on
telnet.readUntil("login:");
telnet.write(user);
telnet.readUntil("Password:");
telnet.write(password);
// Advance to a prompt
telnet.readUntil(telnet.prompt + " ");
telnet.sendCommand("ps -ef");
telnet.sendCommand("ls");
telnet.sendCommand("w");
telnet.disconnect();
}
}
Telnet has no real concept of a password packet, a password prompt is just like any normal text output. This means that you can just send the username and password when connection as separate lines, and the telnet server will use them correctly.
ch.writeAndFlush("administrator" + "\r\n");
ch.writeAndFlush("LetMeIn4!!" + "\r\n");
If you require connecting to server that don't always require the password, then you should read the output from the server, check if it contains "username", send the username, then keep reading if it contains "password" and send the password. This is prone to breaking as servers are not required to send those strings, and legit output may also contain those. This is the downside of the telnet protocol.
I hope this my article is helpful to someone.
Netty | Implement Telnet Automated Authentication
I had to use Telnet to control the sub-equipment while developing the space ground station software. Except for the authentication, Telnet is quite similar to regular TCP server communication. So, I implemented a Handler that automatically handles Telnet authentication to communicate with the Telnet server. When connecting to the Telnet server, the following introductory message, “Username: “, “Passwrod: “ messages are displayed in sequence, and user authentication is requested. Handler automatically handles the authentication process as if a human would input account information. Below is a brief description of the implementation.
c:\> telnet 192.168.0.1 12345
Power On Self Test (POST) Passed.
Integrated Control Unit (ICU) Build xxx (Build:xxxxxx) - Feb 7 2022, 17:57:16 (Network/TCP)
Date and Time: 2022-02-16 20:01:19 (GMT)
MAC Address : [00:xx:xx:xx:C6:8F]
Username: User
Password: 1234
>
Handler
TelnetAuthenticator Handler simply works as follows.
If the message contains the string “Username: “, send the username.
If the message contains the string “Password: “, the password is sent.
If the message contains the string “>” waiting for input, delete the authentication handler from the Pipeline. After authentication, TelnetAuthenticator Handler is unnecessary.
If the account is not registered on the Telnet server or the password does not match, the string “Username: “ or “Password: “ is repeatedly received. The authentication failure error is unrecoverable, notifying the user of a failed authentication process and forcing them to disconnect.
#Slf4j
#RequiredArgsConstructor
public class TelnetAuthenticator extends SimpleChannelInboundHandler<String> {
private final ChannelSpec channelSpec;
private boolean alreadyUserTried = false;
private boolean alreadyPasswordTried = false;
#Override
protected void channelRead0(ChannelHandlerContext ctx, String msg) {
// If the message contains the string “Username: “, send the username.
if (msg.contains(channelSpec.getReqUserTag())) {
if (alreadyUserTried) {
processFail(ctx);
}
ctx.channel().writeAndFlush(channelSpec.getAccount().getUser() + channelSpec.getEndLine());
alreadyUserTried = true;
return;
}
// If the message contains the string “Password: “, the password is sent.
if (msg.contains(channelSpec.getReqPasswordTag())) {
if (alreadyPasswordTried) {
processFail(ctx);
}
ctx.channel().writeAndFlush(channelSpec.getAccount().getPassword() + channelSpec.getEndLine());
alreadyPasswordTried = true;
return;
}
// If the incoming message contains an input waiting message, the Pipeline deletes the current handler.
if (msg.contains(channelSpec.getStandByTag())) {
ctx.pipeline().remove(this.getClass());
}
}
private void processFail(ChannelHandlerContext ctx) {
ctx.fireUserEventTriggered(ErrorMessage.AUTHENTICATE_FAIL);
ctx.close();
}
}
Initialize ChannelPipeline
A ChannelPipeline configuration with a TelnetAuthenticator Handler can be: First, register InboundHandlers as follows.
First, add DelimiterBasedFrameDecoder with “Username: “, “Password: “, “>” strings as delimiters. The stripDelimiter option is set to false because all delimiters must be received to recognize the authentication process.
Add StringDecoder.
Add the implemented TelnetAuthenticator Handler.
Add other necessary business logic.
Simply add StringEncoder to Outbound. You can add other Handlers as needed.
public class PipelineInitializer extends ChannelInitializer<SocketChannel> {
private ChannelSpec channelSpec;
public void init(ChannelSpec channelSpec) {
this.channelSpec = channelSpec;
}
#Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline()
// Inbound
.addLast(new DelimiterBasedFrameDecoder(1024, false,
channelSpec.getDelimiter().reqUserTag(),
channelSpec.getDelimiter().reqPasswordTag(),
channelSpec.getDelimiter().standByTag()))
.addLast(new StringDecoder())
.addLast(new TelnetAuthenticator(channelSpec))
.addLast(new BusinessLogic())
// Outbound
.addLast(new StringEncoder());
}
}
ChannelSpec
ChannelSpec defines specifications required for communication with Telnet server. Manage server IP, port, account information, separator, etc.
#Getter
public class ChannelSpec {
private final String serverIp = "192.168.0.1";
private final int serverPort = 12345;
private final String endLine = "\r\n";
private final String standByTag = ">";
private final String reqUserTag = "Username: ";
private final String reqPasswordTag = "Password: ";
private final Account account = new Account("User", "1234");
private final Delimiter delimiter = new Delimiter();
public class Delimiter {
public ByteBuf standByTag() {
return toByteBuf(standByTag);
}
public ByteBuf reqUserTag() {
return toByteBuf(reqUserTag);
}
public ByteBuf reqPasswordTag() {
return toByteBuf(reqPasswordTag);
}
private ByteBuf toByteBuf(String input) {
ByteBuf delimiterBuf = Unpooled.buffer();
delimiterBuf.writeCharSequence(input, StandardCharsets.UTF_8);
return delimiterBuf;
}
}
}
#RequiredArgsConstructor
#Getter
public class Account {
private final String user;
private final String password;
}
I am new to UCMA and I am learning as I go through examples. I am trying to build 2 Lync clients A and B with the scenario as follows,
A calls B
B answers
A plays audio
B records it using Recorder.
I am stuck at trying to record the call at B. For B its an incoming call. I need to attach the audiovideoflow to the recorder, but I am not sure on how to do it. I will appreciate any help.
Apologies on the unformatted code, I am not sure how to format it properly, I tried.
Thanks.
Kris
Client B Code:
Accepts an incoming call
Records the media received in the incoming call. ***This is the part I have trouble
using System;
using System.Threading;
using Microsoft.Rtc.Collaboration;
using Microsoft.Rtc.Collaboration.AudioVideo;
using Microsoft.Rtc.Signaling;
using Microsoft.Rtc.Collaboration.Lync;
namespace Microsoft.Rtc.Collaboration.LyncUAS
{
public class LyncUAS
{
#region Locals
private LyncUASConfigurationHelper _helper;
private UserEndpoint _userEndpoint;
private AudioVideoCall _audioVideoCall;
private AudioVideoFlow _audioVideoFlow;
private Conversation _incomingConversation;
//Wait handles are only present to keep things synchronous and easy to read.
private AutoResetEvent _autoResetEvent = new AutoResetEvent(false);
private EventHandler<AudioVideoFlowConfigurationRequestedEventArgs> _audioVideoFlowConfigurationRequestedEventHandler;
private EventHandler<MediaFlowStateChangedEventArgs> _audioVideoFlowStateChangedEventHandler;
private AutoResetEvent _waitForAudioVideoCallEstablishCompleted = new AutoResetEvent(false);
private AutoResetEvent _waitForAudioVideoFlowStateChangedToActiveCompleted = new AutoResetEvent(false);
private AutoResetEvent _waitForPrepareSourceCompleted = new AutoResetEvent(false);
#endregion
#region Methods
/// <summary>
/// Instantiate and run the DeclineIncomingCall quickstart.
/// </summary>
/// <param name="args">unused</param>
public static void Main(string[] args)
{
LyncUAS lyncUAS = new LyncUAS();
lyncUAS.Run();
}
private void Run()
{
string filename = "received.wma";
_helper = new LyncUASConfigurationHelper();
// Create a user endpoint, using the network credential object
// defined above.
_userEndpoint = _helper.CreateEstablishedUserEndpoint("Lync UAS" /*endpointFriendlyName*/);
_userEndpoint.RegisterForIncomingCall<AudioVideoCall>(On_AudioVideoCall_Received);
Console.WriteLine("Waiting for incoming call...");
_autoResetEvent.WaitOne();
Console.WriteLine("came after call is connected");
//start recording for audio.
Recorder recorder = new Recorder();
recorder.StateChanged += new EventHandler<RecorderStateChangedEventArgs>(recorder_StateChanged);
recorder.VoiceActivityChanged += new EventHandler<VoiceActivityChangedEventArgs>(recorder_VoiceActivityChanged);
//**********This is the issue, currently _audioVideoFlow is null, it is not attached to the flow
//So this will fail, how to attach _audioVideoFlow to an incoming call ?? HELP !!!
// recorder.AttachFlow(_audioVideoFlow); ------------> HELP!
WmaFileSink sink = new WmaFileSink(filename);
recorder.SetSink(sink);
recorder.Start();
Console.WriteLine("Started Recording ...");
_autoResetEvent.WaitOne();
recorder.Stop();
Console.WriteLine("Stopped Recording ...");
recorder.DetachFlow();
Console.WriteLine("Exiting");
Thread.Sleep(2000);
}
private void audioVideoFlow_StateChanged(object sender, MediaFlowStateChangedEventArgs e)
{
Console.WriteLine("Flow state changed from " + e.PreviousState + " to " + e.State);
//When flow is active, media operations can begin
if (e.State == MediaFlowState.Active)
{
// Flow-related media operations normally begin here.
_waitForAudioVideoFlowStateChangedToActiveCompleted.Set();
}
// call sample event handler
if (_audioVideoFlowStateChangedEventHandler != null)
{
_audioVideoFlowStateChangedEventHandler(sender, e);
}
}
void recorder_VoiceActivityChanged(object sender, VoiceActivityChangedEventArgs e)
{
Console.WriteLine("Recorder detected " + (e.IsVoice ? "voice" : "silence") + " at " + e.TimeStamp);
}
void recorder_StateChanged(object sender, RecorderStateChangedEventArgs e)
{
Console.WriteLine("Recorder state changed from " + e.PreviousState + " to " + e.State);
}
void On_AudioVideoCall_Received(object sender, CallReceivedEventArgs<AudioVideoCall> e)
{
//Type checking was done by the platform; no risk of this being any
// type other than the type expected.
_audioVideoCall = e.Call;
// Call: StateChanged: Only hooked up for logging, to show the call
// state transitions.
_audioVideoCall.StateChanged += new
EventHandler<CallStateChangedEventArgs>(_audioVideoCall_StateChanged);
_incomingConversation = new Conversation(_userEndpoint);
Console.WriteLine("Call Received! From: " + e.RemoteParticipant.Uri + " Toast is: " +e.ToastMessage.Message);
_audioVideoCall.BeginAccept(
ar =>
{
try {
_audioVideoCall.EndAccept(ar);
Console.WriteLine("Call must be connected at this point. "+_audioVideoCall.State);
_autoResetEvent.Set();
} catch (RealTimeException ex) { Console.WriteLine(ex); }
}, null);
}
//Just to record the state transitions in the console.
void _audioVideoCall_StateChanged(object sender, CallStateChangedEventArgs e)
{
Console.WriteLine("Call has changed state. The previous call state was: " + e.PreviousState +
" and the current state is: " + e.State);
if (e.State == CallState.Terminated)
{
Console.WriteLine("Shutting down");
_autoResetEvent.Set();
_helper.ShutdownPlatform();
}
}
#endregion
}
}
I think I have figured out what's not quite right here.
Your Code
// Create a user endpoint, using the network credential object
// defined above.
_userEndpoint = _helper.CreateEstablishedUserEndpoint("Lync UAS" /*endpointFriendlyName*/);
_userEndpoint.RegisterForIncomingCall<AudioVideoCall>(On_AudioVideoCall_Received);
Console.WriteLine("Waiting for incoming call...");
_autoResetEvent.WaitOne();
Console.WriteLine("came after call is connected");
//start recording for audio.
Recorder recorder = new Recorder();
recorder.StateChanged += new EventHandler<RecorderStateChangedEventArgs>(recorder_StateChanged);
recorder.VoiceActivityChanged += new EventHandler<VoiceActivityChangedEventArgs>(recorder_VoiceActivityChanged);
//**********This is the issue, currently _audioVideoFlow is null, it is not attached to the flow //So this will fail, how to attach _audioVideoFlow to an incoming call ?? HELP !!!
// recorder.AttachFlow(_audioVideoFlow); ------------> HELP!
Looking good so far. I'm assuming you're establishing and such in your CreateEstablishedUserEndpoint method, but I'm not seeing where you're getting the value for _audioVideoFlow.
I'm guessing you might be doing it elsewhere, but on the off chance that's actually where you're running into problems, here's that bit:
Simplest pattern to get AVFlow
public static void RegisterForIncomingCall(LocalEndpoint localEndpoint)
{
localEndpoint.RegisterForIncomingCall
<AudioVideoCall>(IncomingCallDelegate);
}
private static void IncomingCallDelegate(object sender, CallReceivedEventArgs<AudioVideoCall> e)
{
e.Call.AudioVideoFlowConfigurationRequested += IncomingCallOnAudioVideoFlowConfigurationRequested;
}
private static void IncomingCallOnAudioVideoFlowConfigurationRequested(object sender, AudioVideoFlowConfigurationRequestedEventArgs e)
{
AudioVideoFlow audioVideoFlow = e.Flow; // <--- There's your flow, gentleman.
}
Now, instead of registering for your incoming call, just call RegisterForIncomingCall(_userEndpoint);.
Your AVFlow will be hanging off e.Flow above, you could then pass that into your recorder: recorder.AttachFlow(e.Flow) or simply assign the flow to a field in your class and autoResetEvent.WaitOne(); and set that up where you're setting that up now.
Obviously this is a pretty naive implementation. A lot can go wrong in those few lines of code (exception handling/static event handler memory leak comes immediately to mind); don't forget to wire up events related to status changes on the conversation/call and endpoints, as well as any of the recovery related items.
I have to upload and download a file using FTP server but I am facing issues in it. Have gone though many solutions but nothing seems to be working.
I am using secureftp-test.com as the testing FTP server.
Below is the code for uploading where in I am using FTPClient storeFile method but it doesn't seems to work.
public static void main(String[] args) {
String server = "ftp.secureftp-test.com";
int port = 21;
String user = "test";
String pass = "test";
FTPClient ftpClient = new FTPClient();
try {
ftpClient.connect(server, port);
boolean login = ftpClient.login(user, pass);
System.out.println("login " + login);
ftpClient.setFileTransferMode(FTP.BINARY_FILE_TYPE);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
File firstLocalFile = new File("D:/jetty.pdf");
String firstRemoteFile = "myfile.pdf";
InputStream inputStream = new FileInputStream(firstLocalFile);
System.out.println("Start uploading first file");
boolean done = ftpClient.storeFile(firstRemoteFile, inputStream);
inputStream.close();
if (done) {
System.out.println("The first file is uploaded successfully.");
} else {
System.out.println("upload failed");
}
} catch (IOException ex) {
System.out.println("Error: " + ex.getMessage());
ex.printStackTrace();
} finally {
try {
if (ftpClient.isConnected()) {
ftpClient.logout();
ftpClient.disconnect();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
Each time the output is "upload failed". I don't understand where i am wrong.
Your port is incorrect. It uses:
FTPS via Auth TLS/SSL and implicit FTP over SSL on port 990
Also, if you read the site carefully, upload is forbidden:
Chilkat provides this FTPS test account for anyone wishing to test secure FTP client functionality. You may connect to ftp.secureftp-test.com, login as "test" with password "test", and download any files present on the server. The "test" account may also retrieve directory listings. However, it is restricted from uploading files to the server.
Reference: secureftp-test.com
We've developed a .NET 3.5 CF Application and we're experiencing some application crashes due to unhandled exceptions, thrown in some lib code.
The application terminates and the standard application popup exception message box is shown.
Is there a way to catch all unhandled exceptions? Or at least, catch the text from the message box. Most of our customers simply restart the device, so that we're not able to have a look on the exception message box.
Any ideas?
Have you added an UnhandledException event handler?
[MTAThread]
static void Main(string[] args)
{
AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;
// start your app logic, etc
...
}
static void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
{
var exception = (Exception)e.ExceptionObject;
// do something with the info here - log to a file or whatever
MessageBox.Show(exception.Message);
}
I do something similar to what ctacke does.
private static Form1 objForm;
[MTAThread]
static void Main(string[] args)
{
objForm = new Form1();
try
{
Application.Run(objForm);
} catch (Exception err) {
// do something with the info here - log to a file or whatever
MessageBox.Show(err.Message);
if ((objForm != null) && !objForm.IsDisposed)
{
// do some clean-up of your code
// (i.e. enable MS_SIPBUTTON) before application exits.
}
}
}
Perhaps he can comment on whether my technique is good or bad.