I have a web page(ASP.NET) that a client (just one) connect to it and after registration I save it's IP address into a text file. What I want to do is if this client has closed the web page, I want to detect it and clear my text file .
Using this You can check Connection
System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()
EXAMPLE:--
public static void **testInternetConnection**()
{
if (System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
{
System.Windows.MessageBox.Show("This computer is connected to the internet");
}
else
{
System.Windows.MessageBox.Show("This computer is not connected to the internet");
}
}
Related
I was trying to understand if it is possible(if yes how) to continue the OTA process after downloading the bin file hosted in a remote IP (within the network) ? The code is to be running on ESP32. (Edit) i am trying to introduce a method of self OTA update..which can also be triggered by hitting an end point of the esp webserver (either through mqtt, http etc etc)
I am referring to How to enable the server to automatically download files using arduino for ESP32 WebServer without using SPIFFS and instead using SDcard file but it focusses on downloading from sd card but not network.
Currently, I am following the code mentioned in https://randomnerdtutorials.com/esp32-over-the-air-ota-programming/ which currently deals in uploading the bin file through browser, which I am trying to automate.
If somehow I can trigger this part of the code with the data programmatically then I think my question will still be solved.
server.on("/update", HTTP_POST, []() {
server.sendHeader("Connection", "close");
server.send(200, "text/plain", (Update.hasError()) ? "FAIL" : "OK");
ESP.restart();
}, []() {
HTTPUpload& upload = server.upload();
if (upload.status == UPLOAD_FILE_START) {
Serial.printf("Update: %s\n", upload.filename.c_str());
if (!Update.begin(UPDATE_SIZE_UNKNOWN)) { //start with max available size
Update.printError(Serial);
}
} else if (upload.status == UPLOAD_FILE_WRITE) {
/* flashing firmware to ESP*/
if (Update.write(upload.buf, upload.currentSize) != upload.currentSize) {
Update.printError(Serial);
}
} else if (upload.status == UPLOAD_FILE_END) {
if (Update.end(true)) { //true to set the size to the current progress
Serial.printf("Update Success: %u\nRebooting...\n", upload.totalSize);
} else {
Update.printError(Serial);
}
}
});
Regards,
Shariq
This question already has an answer here:
How to check if network address is local in Qt
(1 answer)
Closed 6 years ago.
My application connects to a tcp server. I'd like it to be aware of being running on the same host as the server app, so it can eventually directly lauch the server process if it's not up.
As the server listens on an interface and the application resolves a hostname to connect to the server, it's not so obvious for me to determine if the configured hostname used to connect the server points to the same host as the server or not.
I'd like something like this:
bool isThisLocalHost(QString hostName) {
//resolve hostname's address
//list localhost interfaces ip or hw addresses ?
//if the hostname address matches one of the host interfaces address
//pseudo code
bool bRes = interfaces_addresses_list.contains(hostname_address);
return bRes;
}
I'm actually trying to achieve this with
QNetworkInterface, QNetworkAddressEntry, QHostInfo, QHostAddress.
Maybe is there a simple way?
Here is what i got:
bool isThisLocalHost(QString hostName) {
QList <QHostAddress> lAddrHostName = QHostInfo::fromName(hostName).addresses();
QList <QHostAddress> lAddrLocalHostInterfaces = QNetworkInterface::allAddresses();
bool bRes = false;
foreach (QHostAddress addr, lAddrHostName) {
bRes = bRes || lAddrLocalHostInterfaces.contains(addr);
}
return bRes;
}
QHostAddress has isLoopback() which should get you what you need.
If you just want to know if you're connected to yourself this is (partly?) a duplicate of this question.
I want to assign specific information for the server's characters and as well as the client's characters. Now, how do I know if the player is the host or the client? I tried using isServer and isClient, but it both return true. Are these the correct keywords that I should use?
void Update () {
if(isServer){
Debug.Log("I'm the server");
}
if(isClient){
Debug.Log("I'm the client");
}
}
If you're connecting as a "host", you're actually both the "client" and "server" at the same time. This is in contrast to running a "dedicated server", which acts as the server authority, but doesn't represent a "client" connection. Like you suggest in your own answer, you can use isServer and !isServer, or probably:
void Update() {
if (isServer) {
Debug.Log("I'm the server (or host)");
} else {
Debug.Log("I'm the client");
}
}
Instead of using isClient to determine if player is the client, i use !isServer instead.
void Update () {
if(isServer){
Debug.Log("I'm the server");
}
if(!isServer){
Debug.Log("I'm the client");
}
}
Not sure if this applies to every situation, so I apologize if it does not - I am using a plugin called NATTraversal for Unity, and I was having a similar issue. I needed to find which connection is the host. However for me, since I am not using the relay servers (this is for you guys who are avoiding the relay) I found that I can do this check..
using UnityEngine.Networking;
void Start(){
if(NetworkServer.connections.Count > 0){
Debug.Log("This is the host.");
} else {
Debug.Log("This is a client.");
}
}
This works in my scenario because the client's connection list is empty, but the host's is not. There very well may be a better way to do this, but I didn't know of one without a previous built list of NetworkIdentity's.
The Network.isServer bool always returns false for me, so this is how I got around it. Hopefully it helps someone out there.
Edit: (Adding crucial information)
Please note, that this is AFTER matchmaking and connections have been established.
Another way to do it I have found is by listening to OnServerConnect in the NATLobbyManager.
public override void OnServerConnect(NetworkConnection conn){ }
That event only triggers for the host with the NATTraversal plugin, more info for anyone who may come across this while trying to figure all this stuff out. :)
I need to make a handshake. I do it with the code below.
I'm running the code in an applet and it works fine when running directly against the server. The problem I have occurs when the same code runs via a proxy.
I'm looking in the java console with trace level 5 activated. Directly after the code line "SSLSocket socket = (SSLSocket) factory.createSocket("www.theserver.com", 443);" is executed
this line appears in the java console "network: Connecting http://www.theserver.com:443 with proxy=DIRECT". After this the applet stops working. I think it is because the
proxy will not allow http traffic on port 443.
Can anyone tell me why it is connecting using http and what I should do to make it connect using https?
import javax.net.ssl.HandshakeCompletedEvent;
import javax.net.ssl.HandshakeCompletedListener;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
public class Handshake
{
class MyHandshakeListener implements HandshakeCompletedListener
{
public void handshakeCompleted(HandshakeCompletedEvent e)
{
System.out.println("Handshake succesful!");
System.out.println("Using cipher suite: " + e.getCipherSuite());
}
}
public void DoHandshake()
{
try
{
SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SSLSocket socket = (SSLSocket) factory.createSocket("www.theserver.com", 443);
String[] suites = socket.getSupportedCipherSuites();
socket.setEnabledCipherSuites(suites);
socket.addHandshakeCompletedListener(new MyHandshakeListener());
socket.startHandshake();
}
catch (Exception e)
{
System.out.println(e);
}
}
}
I know this is a little late, but we had the exact same problem and was just able to resolve it. The problem was on the client, the "Use SSL 2.0 compatible ClientHello format" was checked on the advanced tab of the Java Control Panel. Uncheck this box on the client and it will connect correctly.
I am trying to figure out how to send an email from a Flash Mobile (smartphones: blackberries, iphones, androids) app using mxml and Flash using Flash Builder 4.6. My boss told me to find out if it is possible. So far, I have been doing a lot of searching around on the internet for an answer.
I found this website: http://www.bytearray.org/?p=27, that has some classes for sending email in flash, but #1, I don't know if they work in Mobile apps, and #2, I can't find any instructions or tutorials on how to use the classes to send a simple email.
I downloaded the package from the site and imported into my project, where I am trying to send the code. But without sample code on how to simply send an email, I am not entirely sure what all do, and nor am I sure how to determine things like what port number to construct the SMTPMailer object (the SMTPMailer object is included in that package, and it takes a host string and a port number integer in it's constructor), right now I am trying 80 or 8080 for the port number, and I've tried localhost and one of our server computers, 198.162.1.109 for the host.
Anyway, I keep getting this error: Error #2044: Unhandled IOErrorEvent:. text=Error #2031: Socket Error.
Here is some of my sample code:
[Bindable]
private var mailer : SMTPMailer;
private function init() : void {
tbPass.displayAsPassword = true;
}
protected function btnClick_email(toAddress : String, fromAddress : String, pass : String) : void {
mailer = new SMTPMailer("198.168.1.109", 8080);
mailer.addEventListener(SMTPEvent.MAIL_SENT, onMailSent);
mailer.addEventListener(SMTPEvent.MAIL_ERROR, onMailError);
mailer.addEventListener(SMTPEvent.CONNECTED, onConnected);
mailer.addEventListener(SMTPEvent.DISCONNECTED, onDisconnected);
mailer.connect("hotmail.com", 8080);
mailer.authenticate(toAddress, pass);
mailer.sendHTMLMail(fromAddress, toAddress, "Subect", "Message");
}
private function onMailSent() : void {
lblEmailResult.text = "Sent Mail";
}
private function onMailError() : void {
lblEmailResult.text = "Error";
}
private function onConnected() : void {
lblEmailResult.text = "Connected";
}
private function onDisconnected() : void {
lblEmailResult.text = "Disconnected";
}
I would suggest using a back-end service to send emails, it is same as connecting to a SMTP mail server but it is more flexible.
That being said, it should work, the error you are getting is related to your host IP, are you sure you have SMTP server running on "198.168.1.109:8080"?
First check if you can send mails from it before trying to do it trough Flex, if that is OK, then you should double check socket policy files:
http://www.adobe.com/devnet/flashplayer/articles/socket_policy_files.html
Hope that helps
Can't you just use navigateToURL() for this?
Ie:
var request:URLRequest("mailto:someone#somewhere.com");
navigateToURL(request);
That's all - 2 lines :)
I've accomplished this in a commercial app I worked on. We used a native extension found in distriqt's set of tools. Google them. The full suite of tools is cheap, though if you have any issues, do not expect a quick reply. Their message tool is what you are looking for, and it is easy to use.