Get Windows Firewall prompt for console app but not service

Get Windows Firewall prompt for console app but not service - c#

I have a c# .NET app that receives TCP and UDP streams from other devices on the network.
When I run it as console app, the Windows Firewall prompts me: "Windows Firewall has blocked some features of this program" and it ask me to allow vshost32.exe to communicate on the network.
I agree and the app works fine.
However when I run the app as a service (I have a separate console and service wrappers) I get no such prompt and I can only get it to work if switch off the firewall.
Is this expected for services? ()
Also, I have read some code snippets that suggest you can manually add exceptions to Windows Firewall list. Is this just for console apps or will it work for services also?
Some my code that listens on the ports in case this is usefull...
//
// Setup UDP listening
//
if (protocol == "UDP")
{
m_udp = new UdpConn("RedwallReceiver UDP", m_local, new NetAddress());
m_udp.Receive(new VDataHandler(ReceiveData));
}
//
// Setup TCP listening
//
if (protocol == "TCP")
{
m_listener = new TcpListener(m_local);
m_listener.Start();
m_listener.BeginAcceptSocket(AcceptSocket, null);
}

Services execute under restricted environments and are allowed to have very little or no interaction with the UI. His answer covers all the reasoning and here is how to achieve the same.
I would recommend adding an additional project to your solution (let's call it Configurator) which can be launched as part of the installation process. As far as I remember, adding a rule to the firewall requires administrative privileges. Here are the steps:
Create the Configurator project as a Console or WinForms application. No UI is needed here.
Add an application manifest file to the Configurator project. right-click project, Add > New Item > Application Manifest File. Change the <requestedExecutionLevel> tag to read <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />.
Add the output of the Configurator project to your setup/deployment project.
Select the deployment project and navigate to the Custom Actions tab. Add a new custom action under the Commit node and make it point to the output of the Configurator project.
In the Configurator project, add a reference to NetFwTypeLib from COM references.
Add the code below to the Configurator project.
Modify the Main method of the Configurator project to return an int (0 for success, non-zero for failure) and use the following code. Note that I've pasted this from my project directly so you may need to fix some decleration errors, etc.
private static int Main (string [] args)
{
var application = new NetFwAuthorizedApplication()
{
Name = "MyService",
Enabled = true,
RemoteAddresses = "*",
Scope = NET_FW_SCOPE_.NET_FW_SCOPE_ALL,
IpVersion = NET_FW_IP_VERSION_.NET_FW_IP_VERSION_ANY,
ProcessImageFileName = "ServiceAssemblyName.dll",
};
return (FirewallUtilities.AddApplication(application, out exception) ? 0 : -1);
}
namespace MySolution.Configurator.Firewall
{
using System;
using System.Linq;
using NetFwTypeLib;
public sealed class NetFwAuthorizedApplication:
INetFwAuthorizedApplication
{
public string Name { get; set; }
public bool Enabled { get; set; }
public NET_FW_SCOPE_ Scope { get; set; }
public string RemoteAddresses { get; set; }
public string ProcessImageFileName { get; set; }
public NET_FW_IP_VERSION_ IpVersion { get; set; }
public NetFwAuthorizedApplication ()
{
this.Name = "";
this.Enabled = false;
this.RemoteAddresses = "";
this.ProcessImageFileName = "";
this.Scope = NET_FW_SCOPE_.NET_FW_SCOPE_ALL;
this.IpVersion = NET_FW_IP_VERSION_.NET_FW_IP_VERSION_ANY;
}
public NetFwAuthorizedApplication (string name, bool enabled, string remoteAddresses, NET_FW_SCOPE_ scope, NET_FW_IP_VERSION_ ipVersion, string processImageFileName)
{
this.Name = name;
this.Scope = scope;
this.Enabled = enabled;
this.IpVersion = ipVersion;
this.RemoteAddresses = remoteAddresses;
this.ProcessImageFileName = processImageFileName;
}
public static NetFwAuthorizedApplication FromINetFwAuthorizedApplication (INetFwAuthorizedApplication application)
{
return (new NetFwAuthorizedApplication(application.Name, application.Enabled, application.RemoteAddresses, application.Scope, application.IpVersion, application.ProcessImageFileName));
}
}
}
namespace MySolution.Configurator.Firewall
{
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using NetFwTypeLib;
public static class FirewallUtilities
{
public static bool GetApplication (string processImageFileName, out INetFwAuthorizedApplication application, out Exception exception)
{
var result = false;
var comObjects = new Stack<object>();
exception = null;
application = null;
if (processImageFileName == null) { throw (new ArgumentNullException("processImageFileName")); }
if (processImageFileName.Trim().Length == 0) { throw (new ArgumentException("The argument [processImageFileName] cannot be empty.", "processImageFileName")); }
try
{
var type = Type.GetTypeFromProgID("HNetCfg.FwMgr", true);
try
{
var manager = (INetFwMgr) Activator.CreateInstance(type);
comObjects.Push(manager);
try
{
var policy = manager.LocalPolicy;
comObjects.Push(policy);
var profile = policy.CurrentProfile;
comObjects.Push(profile);
var applications = profile.AuthorizedApplications;
comObjects.Push(applications);
foreach (INetFwAuthorizedApplication app in applications)
{
comObjects.Push(app);
if (string.Compare(app.ProcessImageFileName, processImageFileName, true, CultureInfo.InvariantCulture) == 0)
{
result = true;
application = NetFwAuthorizedApplication.FromINetFwAuthorizedApplication(app);
break;
}
}
if (!result) { throw (new Exception("The requested application was not found.")); }
}
catch (Exception e)
{
exception = e;
}
}
catch (Exception e)
{
exception = e;
}
finally
{
while (comObjects.Count > 0)
{
ComUtilities.ReleaseComObject(comObjects.Pop());
}
}
}
catch (Exception e)
{
exception = e;
}
finally
{
}
return (result);
}
public static bool AddApplication (INetFwAuthorizedApplication application, out Exception exception)
{
var result = false;
var comObjects = new Stack<object>();
exception = null;
if (application == null) { throw (new ArgumentNullException("application")); }
try
{
var type = Type.GetTypeFromProgID("HNetCfg.FwMgr", true);
try
{
var manager = (INetFwMgr) Activator.CreateInstance(type);
comObjects.Push(manager);
try
{
var policy = manager.LocalPolicy;
comObjects.Push(policy);
var profile = policy.CurrentProfile;
comObjects.Push(profile);
var applications = profile.AuthorizedApplications;
comObjects.Push(applications);
applications.Add(application);
result = true;
}
catch (Exception e)
{
exception = e;
}
}
catch (Exception e)
{
exception = e;
}
finally
{
while (comObjects.Count > 0)
{
ComUtilities.ReleaseComObject(comObjects.Pop());
}
}
}
catch (Exception e)
{
exception = e;
}
finally
{
}
return (result);
}
public static bool RemoveApplication (string processImageFileName, out Exception exception)
{
var result = false;
var comObjects = new Stack<object>();
exception = null;
if (processImageFileName == null) { throw (new ArgumentNullException("processImageFileName")); }
if (processImageFileName.Trim().Length == 0) { throw (new ArgumentException("The argument [processImageFileName] cannot be empty.", "processImageFileName")); }
try
{
var type = Type.GetTypeFromProgID("HNetCfg.FwMgr", true);
try
{
var manager = (INetFwMgr) Activator.CreateInstance(type);
comObjects.Push(manager);
try
{
var policy = manager.LocalPolicy;
comObjects.Push(policy);
var profile = policy.CurrentProfile;
comObjects.Push(profile);
var applications = profile.AuthorizedApplications;
comObjects.Push(applications);
applications.Remove(processImageFileName);
result = true;
}
catch (Exception e)
{
exception = e;
}
}
catch (Exception e)
{
exception = e;
}
finally
{
while (comObjects.Count > 0)
{
ComUtilities.ReleaseComObject(comObjects.Pop());
}
}
}
catch (Exception e)
{
exception = e;
}
finally
{
}
return (result);
}
}
}

Related

WebView How to run even when app is in background/closed (foreground service active)

I'm building an app which will scrape some data from a website and shows a notification when some criteria are met.
Everything works well without problems when the app is open (because the WebView is being rendered) but when I close the app the WebView is disabled so I cannot use it to scrape data anymore.
The scraping code is inside a class called from a ForegroundService.
I've already looked on the internet but I'm unable to find a solution or a substitute to WebView, do you have any ideas?
I'm sorry if this question looks stupid to you, I've started to develop for mobile just one week ago
Below the JDMonitoring class which is called from the AlarmTask class
using System;
using System.Collections.Generic;
using System.Net;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace CGSJDSportsNotification {
public class JDMonitoring {
class Ticket {
string owner;
string title;
string store;
string lastUpdated;
string link;
public string ID { get; set; }
public string Owner {
get {
return owner == null ? "Nobody" : owner;
} set {
owner = value.Remove(0, value.IndexOf('(') + 1).Replace(")", "");
}
}
public string Title {
get {
return title;
} set {
if (value.StartsWith("(P"))
title = value.Remove(0, value.IndexOf(')') + 2);
}
}
public string Status { get; set; }
public string Store {
get {
return store;
} set {
store = value.Replace(#"\u003C", "").Replace(">", "");
}
}
public string LastUpdated {
get {
return lastUpdated;
} set {
string v;
int time = Convert.ToInt32(System.Text.RegularExpressions.Regex.Replace(value, #"[^\d]+", ""));
// Convert to minutes
if (value.Contains("hours"))
time *= 60;
v = time.ToString();
if (value.Contains("seconds"))
v = v.Insert(v.Length, " sec. ago");
else
v = v.Insert(v.Length, " min. ago");
lastUpdated = v;
}
}
public string Link {
get {
return link;
} set {
link = "https://support.jdplc.com/" + value;
}
}
}
public JDMonitoring() {
WB.Source = JDQueueMainUrl;
WB.Navigated += new EventHandler<WebNavigatedEventArgs>(OnNavigate);
}
IForegroundService FgService { get { return DependencyService.Get<IForegroundService>(); } }
WebView WB { get; } = MainPage.UI.MonitoringWebView;
string JDQueueMainUrl { get; } = "https://support.jdplc.com/rt4/Search/Results.html?Format=%27%3Cb%3E%3Ca%20href%3D%22__WebPath__%2FTicket%2FDisplay.html%3Fid%3D__id__%22%3E__id__%3C%2Fa%3E%3C%2Fb%3E%2FTITLE%3A%23%27%2C%0A%27%3Cb%3E%3Ca%20href%3D%22__WebPath__%2FTicket%2FDisplay.html%3Fid%3D__id__%22%3E__Subject__%3C%2Fa%3E%3C%2Fb%3E%2FTITLE%3ASubject%27%2C%0AStatus%2C%0AQueueName%2C%0AOwner%2C%0APriority%2C%0A%27__NEWLINE__%27%2C%0A%27__NBSP__%27%2C%0A%27%3Csmall%3E__Requestors__%3C%2Fsmall%3E%27%2C%0A%27%3Csmall%3E__CreatedRelative__%3C%2Fsmall%3E%27%2C%0A%27%3Csmall%3E__ToldRelative__%3C%2Fsmall%3E%27%2C%0A%27%3Csmall%3E__LastUpdatedRelative__%3C%2Fsmall%3E%27%2C%0A%27%3Csmall%3E__TimeLeft__%3C%2Fsmall%3E%27&Order=DESC%7CASC%7CASC%7CASC&OrderBy=LastUpdated%7C%7C%7C&Query=Queue%20%3D%20%27Service%20Desk%20-%20CGS%27%20AND%20(%20%20Status%20%3D%20%27new%27%20OR%20Status%20%3D%20%27open%27%20OR%20Status%20%3D%20%27stalled%27%20OR%20Status%20%3D%20%27deferred%27%20OR%20Status%20%3D%20%27open%20-%20awaiting%20requestor%27%20OR%20Status%20%3D%20%27open%20-%20awaiting%20third%20party%27%20)&RowsPerPage=0&SavedChartSearchId=new&SavedSearchId=new";
bool MonitoringIsInProgress { get; set; } = false;
public bool IsConnectionAvailable {
get {
try {
using (new WebClient().OpenRead("http://google.com/generate_204"))
return true;
} catch {
return false;
}
}
}
async Task<bool> IsOnLoginPage() {
if (await WB.EvaluateJavaScriptAsync("document.getElementsByClassName('left')[0].innerText") != null)
return true;
return false;
}
async Task<bool> Login() {
await WB.EvaluateJavaScriptAsync($"document.getElementsByName('user')[0].value = '{UserSettings.SecureEntries.Get("rtUser")}'");
await WB.EvaluateJavaScriptAsync($"document.getElementsByName('pass')[0].value = '{UserSettings.SecureEntries.Get("rtPass")}'");
await WB.EvaluateJavaScriptAsync("document.getElementsByClassName('button')[0].click()");
await Task.Delay(1000);
// Checks for wrong credentials error
if (await WB.EvaluateJavaScriptAsync("document.getElementsByClassName('action-results')[0].innerText") == null)
return true;
return false;
}
async Task<List<Ticket>> GetTickets() {
List<Ticket> tkts = new List<Ticket>();
// Queue tkts index (multiple of 2)
int index = 2;
// Iterates all the queue
while (await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index}].innerText") != null) {
Ticket tkt = new Ticket();
tkt.LastUpdated = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index + 1}].getElementsByTagName('td')[4].innerText");
// Gets only the tkts which are not older than the value selected by the user
if (Convert.ToInt32(System.Text.RegularExpressions.Regex.Replace(tkt.LastUpdated, #"[^\d]+", "")) > Convert.ToInt32(UserSettings.Entries.Get("searchTimeframe")))
break;
tkt.ID = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index}].getElementsByTagName('td')[0].innerText");
tkt.Owner = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index}].getElementsByTagName('td')[4].innerText");
tkt.Title = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index}].getElementsByTagName('td')[1].innerText");
tkt.Status = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index}].getElementsByTagName('td')[2].innerText");
tkt.Store = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index + 1}].getElementsByTagName('td')[1].innerText");
tkt.Link = await WB.EvaluateJavaScriptAsync($"document.getElementsByClassName('ticket-list collection-as-table')[0].getElementsByTagName('tbody')[0].getElementsByTagName('tr')[{index}].getElementsByTagName('td')[1].getElementsByTagName('a')[0].getAttribute('href')");
tkts.Add(tkt);
index += 2;
}
return tkts;
}
//async Task<string> QueueGetTkt
async void OnNavigate(object sender, WebNavigatedEventArgs args) {
if (MonitoringIsInProgress)
return;
if (IsConnectionAvailable) {
if (await IsOnLoginPage()) {
if (await Login() == false) {
// If the log-in failed we can't proceed
MonitoringIsInProgress = false;
FgService.NotificationNewTicket("Log-in failed!", "Please check your credentials");
// Used to avoid an infinite loop of OnNavigate method calls
WB.Source = "about:blank";
return;
}
}
// Main core of the monitoring
List<Ticket> tkts = await GetTickets();
if (tkts.Count > 0) {
foreach(Ticket t in tkts) {
// Looks only after the tkts with the country selected by the user (and if it was selected by the user, also for the tkts without a visible country)
// Firstly we look in the title
if (t.Title.Contains(MainPage.UI.CountryPicker.SelectedItem.ToString())) {
FgService.NotificationNewTicket($"[{t.ID}] {t.LastUpdated}",
$"{t.Title}\r\n\r\n" +
$"Status: {t.Status}\r\n" +
$"Owner: {t.Owner}\r\n" +
$"Last updated: {t.LastUpdated}");
break;
}
}
}
}
MonitoringIsInProgress = false;
}
}
}
AlarmTask class
using Android.App;
using Android.Content;
using Android.Support.V4.App;
namespace CGSJDSportsNotification.Droid {
[BroadcastReceiver(Enabled = true, Exported = true, DirectBootAware = true)]
[IntentFilter(new string[] { Intent.ActionBootCompleted, Intent.ActionLockedBootCompleted, "android.intent.action.QUICKBOOT_POWERON", "com.htc.intent.action.QUICKBOOT_POWERON" }, Priority = (int)IntentFilterPriority.HighPriority)]
public class AlarmTask : BroadcastReceiver {
IAlarm _MainActivity { get { return Xamarin.Forms.DependencyService.Get<IAlarm>(); } }
public override void OnReceive(Context context, Intent intent) {
if (intent.Action != null) {
if (intent.Action.Equals(Intent.ActionBootCompleted)) {
// Starts the app after reboot
var serviceIntent = new Intent(context, typeof(MainActivity));
serviceIntent.AddFlags(ActivityFlags.NewTask);
context.StartActivity(serviceIntent);
Intent main = new Intent(Intent.ActionMain);
main.AddCategory(Intent.CategoryHome);
context.StartActivity(main);
// Does not work, app crashes on boot received
/*if (UserSettings.Entries.Exists("monitoringIsRunning")) {
if ((bool)UserSettings.Entries.Get("monitoringIsRunning"))
FgService.Start();
}*/
}
} else
// Checks for new tkts on a new thread
new JDMonitoring();
// Restarts the alarm
_MainActivity.AlarmStart();
}
// Called from JDMonitoring class
public static void NotificationNewTicket(string title, string message, bool icoUnknownCountry = false) {
new AlarmTask().NotificationShow(title, message, icoUnknownCountry);
}
void NotificationShow(string title, string message, bool icoUnknownCountry) {
int countryFlag = Resource.Drawable.newTktUnknownCountry;
if (icoUnknownCountry == false) {
switch (MainPage.UI.CountryPicker.SelectedItem.ToString()) {
case "Italy":
countryFlag = Resource.Drawable.newTktItaly;
break;
case "Spain":
countryFlag = Resource.Drawable.newTktSpain;
break;
case "Germany":
countryFlag = Resource.Drawable.newTktGermany;
break;
case "Portugal":
countryFlag = Resource.Drawable.newTktPortugal;
break;
}
}
var _intent = new Intent(Application.Context, typeof(MainActivity));
_intent.AddFlags(ActivityFlags.ClearTop);
_intent.PutExtra("jdqueue_notification", "extra");
var pendingIntent = PendingIntent.GetActivity(Application.Context, 0, _intent, PendingIntentFlags.OneShot);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(Application.Context, "newTktNotification_channel")
.SetVisibility((int)NotificationVisibility.Public)
.SetPriority((int)NotificationPriority.High)
.SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate | (int)NotificationDefaults.Lights)
.SetSmallIcon(Resource.Drawable.newTktNotification)
.SetLargeIcon(Android.Graphics.BitmapFactory.DecodeResource(Application.Context.Resources, countryFlag))
.SetSubText("Click to check the queue")
.SetStyle(new NotificationCompat.BigTextStyle()
.SetBigContentTitle("New ticket available!")
.BigText(message))
.SetContentText(title)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent);
NotificationManagerCompat.From(Application.Context).Notify(0, notificationBuilder.Build());
}
}
}
And the ForegroundService class which is responsible to trigger for the first time the alarm
using Android.App;
using Android.Content;
using Android.OS;
namespace CGSJDSportsNotification.Droid {
[Service]
class ForegroundService : Service {
IAlarm _MainActivity { get { return Xamarin.Forms.DependencyService.Get<IAlarm>(); } }
public override IBinder OnBind(Intent intent) { return null; }
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId) {
// Starts the Foreground Service and the notification channel
StartForeground(9869, new ForegroundServiceNotification().ReturnNotif());
Android.Widget.Toast.MakeText(Application.Context, "JD Queue - Monitoring started!", Android.Widget.ToastLength.Long).Show();
_MainActivity.AlarmStart();
return StartCommandResult.Sticky;
}
public override void OnDestroy() {
Android.Widget.Toast.MakeText(Application.Context, "JD Queue - Monitoring stopped!", Android.Widget.ToastLength.Long).Show();
_MainActivity.AlarmStop();
UserSettings.Entries.AddOrEdit("monitoringIsRunning", false);
UserSettings.Entries.AddOrEdit("monitoringStopPending", false, false);
base.OnDestroy();
}
public override bool StopService(Intent name) {
return base.StopService(name);
}
}
}
Thank you!

[BETTER-FINAL-SOLUTION]
After several hours I've discovered Android WebView which does exactly what I need (I'm developing this app only for Android)
I've written this Browser helper class
class Browser {
public Android.Webkit.WebView WB;
static string JSResult;
public class CustomWebViewClient : WebViewClient {
public event EventHandler<bool> OnPageLoaded;
public override void OnPageFinished(Android.Webkit.WebView view, string url) {
OnPageLoaded?.Invoke(this, true);
}
}
public Browser(CustomWebViewClient wc, string url = "") {
WB = new Android.Webkit.WebView(Android.App.Application.Context);
WB.Settings.JavaScriptEnabled = true;
WB.SetWebViewClient(wc);
WB.LoadUrl(url);
}
public string EvalJS(string js) {
JSInterface jsi = new JSInterface();
WB.EvaluateJavascript($"javascript:(function() {{ return {js}; }})()", jsi);
return JSResult;
}
class JSInterface : Java.Lang.Object, IValueCallback {
public void OnReceiveValue(Java.Lang.Object value) {
JSResult = value.ToString();
}
}
}
[EDIT]
Improved the JS returning function with async callbacks (so the JS return value will be always delivered).
Credits to ChristineZuckerman
class Browser {
public Android.Webkit.WebView WB;
public class CustomWebViewClient : WebViewClient {
public event EventHandler<bool> OnPageLoaded;
public override void OnPageFinished(Android.Webkit.WebView view, string url) {
OnPageLoaded?.Invoke(this, true);
}
}
public Browser(CustomWebViewClient wc, string url = "") {
WB = new Android.Webkit.WebView(Android.App.Application.Context);
WB.ClearCache(true);
WB.Settings.JavaScriptEnabled = true;
WB.Settings.CacheMode = CacheModes.NoCache;
WB.Settings.DomStorageEnabled = true;
WB.Settings.SetAppCacheEnabled(false);
WB.Settings.UserAgentString = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.224 Safari/534.10";
WB.LoadUrl(url);
WB.SetWebViewClient(wc);
}
public async Task<string> EvalJS(string js, bool returnNullObjectWhenNull = true) {
string JSResult = "";
ManualResetEvent reset = new ManualResetEvent(false);
Device.BeginInvokeOnMainThread(() => {
WB?.EvaluateJavascript($"javascript:(function() {{ return {js}; }})()", new JSInterface((r) => {
JSResult = r;
reset.Set();
}));
});
await Task.Run(() => { reset.WaitOne(); });
return JSResult == "null" ? returnNullObjectWhenNull ? null : "null" : JSResult;
}
class JSInterface : Java.Lang.Object, IValueCallback {
private Action<string> _callback;
public JSInterface(Action<string> callback) {
_callback = callback;
}
public void OnReceiveValue(Java.Lang.Object value) {
string v = value.ToString();
if (v.StartsWith('"') && v.EndsWith('"'))
v = v.Remove(0, 1).Remove(v.Length - 2, 1);
_callback?.Invoke(v);
}
}
}
Example:
Browser.CustomWebViewClient wc = new Browser.CustomWebViewClient();
wc.OnPageLoaded += BrowserOnPageLoad;
Browser browser = new Browser(wc, "https://www.google.com/");
void BrowserOnPageLoad(object sender, bool e) {
string test = browser.EvalJS("document.getElementsByClassName('Q8LRLc')[0].innerText");
// 'test' will contain the value returned from the JS script
// You can acces the real WebView object by using
// browser.WB
}
// OR WITH THE NEW RETURNING FUNCTION
async void BrowserOnPageLoad(object sender, bool e) {
string test = await browser.EvalJS("document.getElementsByClassName('Q8LRLc')[0].innerText");
// 'test' will contain the value returned from the JS script
// You can acces the real WebView object by using
// browser.WB
}
[FINAL-SOLUTION]
Finally I've found an easy and efficient alternative to WebView.
Now I'm using SimpleBroswer and works great!
[SEMI-SOLUTION]
Alright, I've written a workaround but I don't really like this idea, so please, if you know a better method let me know.
Below my workaround:
In my ForegroundServiceHelper interface I've added a method to check if the MainActivity (where the WebView it's rendered) is visible or not, if isn't visible the MainActivity will be shown and immediately will be hidden back.
And the app will be removed from the last used applications
Method inside my ForegroundServiceHelper Interface
public void InitBackgroundWebView() {
if ((bool)SharedSettings.Entries.Get("MainPage.IsVisible") == false) {
// Shows the activity
Intent serviceIntent = new Intent(context, typeof(MainActivity));
serviceIntent.AddFlags(ActivityFlags.NewTask);
context.StartActivity(serviceIntent);
// And immediately hides it back
Intent main = new Intent(Intent.ActionMain);
main.AddFlags(ActivityFlags.NewTask);
main.AddCategory(Intent.CategoryHome);
context.StartActivity(main);
// Removes from the last app used
ActivityManager am = (new ContextWrapper(Android.App.Application.Context)).GetSystemService(Context.ActivityService).JavaCast<ActivityManager>();
if (am != null) {
System.Collections.Generic.IList<ActivityManager.AppTask> tasks = am.AppTasks;
if (tasks != null && tasks.Count > 0) {
tasks[0].SetExcludeFromRecents(true);
}
}
}
}
The SharedSettings class is an helper class wrapped around the App.Current.Properties Dictionary
And in the OnAppearing and OnDisappearing callbacks I set the shared values to true/false
[EDIT]
This workaround works only if the user is on the homepage, so I need to find an another solution...

Identify processes that are using CLR

The below code is not listing w3wp process, winforms application process!
How to identify the application pool for w3wp process. Is this approach correct?
Code
public static List<String> GetCLRManagedProcesses()
{
var managedProcesses = new List<Process>();
foreach (var process in Process.GetProcesses())
{
try
{
if (process != null && !process.HasExited)
{
for (int i = 0; (i < process.Modules.Count); i++)
{
try
{
var moduleName = process.Modules[i].ModuleName.ToLowerInvariant();
if (FrameworkLibraries().Contains(moduleName))
{
managedProcesses.Add(process);
}
else
{
// winforms, w3wp, all are entering here
}
}
catch (Exception e){ }
}
}
}
catch (Exception ex)
{
}
}
return managedProcesses
.Select(x => x.ProcessName)
.ToList();
}
private static IEnumerable<String> FrameworkLibraries()
{
return new[] { "mscoree.dll", "mscoreei.dll", "mscorwks.dll" };
}
any help appreciated

Using SharpSvn to retrieve log revisions got Disk issue

I'm workin on a wcf service to get some info of svn log.
My service method:
public List<SvnLogInfo> ViewLog(Executable ejecutable) {
Configuration config = m_context.Configuration.SingleOrDefault();
if (config != null) {
SvnClient svnClient = new SvnClient();
SvnRevisionRange svnRevisionRange = new SvnRevisionRange(ejecutable.SvnRevisionFrom, ejecutable.SvnRevisionTo);
SvnLogArgs args = new SvnLogArgs(svnRevisionRange);
Collection<SvnLogEventArgs> logCollection;
svnClient.GetLog(config.RepositoryPath, args, out logCollection);
List<SvnLogInfo> logInfo = new List<SvnLogInfo>();
foreach (SvnLogEventArgs log in logCollection) {
logInfo.Add((SvnLogInfo)log);
}
return logInfo;
}
return null;
}
[Serializable]
public class SvnLogInfo {
public SvnLogInfo() {
}
private string m_message;
public string Mensaje {
get { return m_message; }
set { m_message = value; }
}
private string m_author;
public string Autor {
get { return m_author; }
set { m_author = value; }
}
public static explicit operator SvnLogInfo(SvnLogEventArgs e) {
SvnLogInfo info = new SvnLogInfo();
info.Mensaje = e.LogMessage;
info.Autor = e.Author;
return info;
}
}
It works, but when excetuing this line:
svnClient.GetLog(config.RepositoryPath, args, out logCollection);
Throws me this error message:
There is no disk in drive G.
As I mention, I'm using SharpSvn library. Is there a way to solve this issues?. By the way, the variable config.RepositoryPath has this value "C:\Users\carlos.vega.CONTAPERU\Desktop\Solucion ContaNet v3 Espero Funcione"

Dynamically loading assemblies and instantiating types using reflection

I have a requirement to dynamically load and cast an instance of a class to it's various base types using requirement. Now on reading and trying my hand on some examples, I find that either I probably don't understand all that I need to when it comes to working with classes at runtime.
I have a situation where Abstract class B implements interface A. Now Class B is a base class for class C. When I dynamically load, at runtime, the assembly that contains all 3 types, I expect that I should be able to, using Load From context, load the assembly, create an instance of class C, and cast it to type of interface A. But that does not seem to be happening at all and I would appreciate an explanation as to why. Thanks in Advance.
http://msdn.microsoft.com/en-us/library/2xkww633.aspx
http://msdn.microsoft.com/en-us/library/1009fa28.aspx
public interface ICaseOutputGenerator
{
String SampleProperty { get; set; }
void Process();
}
public abstract class CaseOutputGeneratorBase : ICaseOutputGenerator
{
public String SecondSampleProperty { get; set; }
public virtual void SecondProcessMethod()
{
}
public abstract void ThirdSampleProcessMethod();
public string SampleProperty
{
get;
set;
}
public void Process()
{
Console.WriteLine("Process in CaseOutputGeneratorBase Called");
}
}
public class TestCaseOutputGenerator : CaseOutputGeneratorBase
{
public override void ThirdSampleProcessMethod()
{
throw new NotImplementedException();
}
}
//////////////////////////////////////////////////////////////////////////////
public class TestSandBoxManager
{
public TestSandBoxManager()
{
}
public String ProcessAssemblyByFullDisplayName(String assemblyFullDisplayName)
{
String temp = String.Empty;
var casecust = GetAssemblyByFullDisplayName(assemblyFullDisplayName);
if (casecust != null)
temp = ("Cast Passed");
else
temp = ("Cast Failed");
return temp;
}
public String ProcessFile(String assemblyName, String className)
{
String temp = String.Empty;
var casecust = GetCaseOutputGeneratorObject(assemblyName, className);
if (casecust != null)
temp=("Cast Passed");
else
temp=("Cast Failed");
return temp;
}
private static object GetAssemblyByFullDisplayName(string fullName)
{
try
{
Type caseOutputGen = null;
String fullQualifiedName = String.Empty;
var localAssembly = Assembly.LoadFrom(fullName);
foreach (var testType in localAssembly.GetTypes())
{
if ( testType.FullName != fullName)
continue;
fullQualifiedName = testType.FullName;
break;
}
if (fullQualifiedName == null)
return null;
var obj = Activator.CreateInstance(Type.GetType(fullQualifiedName));
return obj;
}
catch (Exception ex)
{
throw ex;
}
}
public String ProcessFile2(String assemblyName, String className)
{
String temp = String.Empty;
var casecust = GetCaseOutputGeneratorObjectLoadFrom(assemblyName, className);
if (casecust != null)
temp = ("Cast Passed");
else
temp = ("Cast Failed");
return temp;
}
public static ICaseOutputGenerator GetCaseOutputGeneratorObject(string assemblyName, string className)
{
ICaseOutputGenerator caseOutputGen = null;
var obj = GetObject(assemblyName, className);
if (obj != null)
caseOutputGen = (ICaseOutputGenerator)obj; // FAILS HERE
return caseOutputGen;
}
public static ICaseOutputGenerator GetCaseOutputGeneratorObjectLoadFrom(string assemblyName, string className)
{
ICaseOutputGenerator caseOutputGen = null;
try
{
var obj = GetObject2(assemblyName, className);
if (obj != null)
caseOutputGen = (ICaseOutputGenerator)obj; // FAILS HERE
}
catch (Exception ex)
{
throw ex;
}
return caseOutputGen;
}
private static object GetObject2(string fullName, string className)
{
try
{
Type caseOutputGen = null;
String fullQualifiedName = String.Empty;
var localAssembly = Assembly.LoadFrom(fullName);
foreach (var testType in localAssembly.GetTypes())
{
if (!testType.FullName.EndsWith(className, StringComparison.InvariantCultureIgnoreCase))
continue;
caseOutputGen = testType;
fullQualifiedName = testType.FullName;
break;
}
if (caseOutputGen == null)
return null;
var obj = Activator.CreateInstanceFrom(fullName, fullQualifiedName);
return obj.Unwrap();
}
catch (Exception ex)
{
throw ex;
}
}
private static object GetObject(string fullName, string className)
{
try
{
Type caseOutputGen = null;
var localAssembly = Assembly.LoadFrom(fullName);
foreach (var testType in localAssembly.GetTypes())
{
if (!testType.FullName.EndsWith(className, StringComparison.InvariantCultureIgnoreCase)) continue;
caseOutputGen = testType;
break;
}
if (caseOutputGen == null) return null;
var obj = Activator.CreateInstance(caseOutputGen);
return obj;
}
catch (FileNotFoundException ex)
{
throw new Exception("Failed to load assembly: " + Environment.NewLine + fullName, ex);
}
catch (Exception ex)
{
throw new Exception("Failed to load assembly: " + Environment.NewLine + fullName, ex);
}
}
}
//////////////////////////////////////////////////////////////////////////////
public Boolean testReflection2()
{
try
{
//create an instance of the testsandboxmanager
TestSandBoxManager t = new TestSandBoxManager();
String ret = t.ProcessFile2(#"...\Documents\visual studio 2012\Projects\TestSandBox\TestSandBox\bin\Debug\TestSandBox.dll", "TestCaseOutputGenerator");
Console.WriteLine(ret);
Console.ReadLine();
return true;
}
catch (Exception)
{
return false;
}
}

Most likely you have 2 ICaseOutputGenerator - one in each assembly. You can't cast object/interface to similarly named interface in another assembly even if code is identical. You can check the fact that create object implements ICaseOutputGenerator from its own assembly by looking at created object in the debugger.
If it is the case you need to figure out where you want to put ICaseOutputGenerator interface so it is coming from the same assembly for both "custom loaded assembly" and you main application. Often shared interfaces are implemented in separate assembly and linked to all "plug-in" assemblies as well as application assembly.

I think that Alexei Levenkov is spot on. You load your TestSandBox.dll twice. Once as a reference to your project and second time via Assembly.LoadFrom. As per documentation that you yourself linking this can result in unexpected behaviour. Here is a quote for you reference:
If an assembly is loaded with LoadFrom, and the probing path includes
an assembly with the same identity but a different location, an
InvalidCastException, MissingMethodException, or other unexpected
behavior can occur.
This is exactly what's happening in your case. If you change the path you are loading your assembly from to point to the same folder as your main executable, it will work fine.

Getting a System.Error when attempting to Sync using batching in Sync Framework

I am writing an n-tiered application that uses the Sync Framework v2.1 in combination with a WCF web service. My code is based on this example: Database-Sync
Syncing seems to work without a problem. But, when I add the batching functionality I get an error that is proving difficult to debug.
In the client portion of the solution (a WPF app), I have a virtual class that inherits from KnowledgeSyncProvider. It also implements the IDisposable interface. I use this class to call the WCF service I wrote and use the sync functionality there. When the sync code runs (orchestrator.Synchronize() is called), everything seems to work correctly and the EndSession function override that I have written runs without error. But, after execution leaves that function, a System.Error occurs from within Microsoft.Synchronization.CoreInterop.ISyncSession.Start (as far as I can tell).
The functions I have written to provide the IDisposable functionality are never called so, something is happening after EndSession, but before my application's KnowledgeSyncProvider virtual class can be disposed.
Here is the error information:
_message: "System error."
Stack Trace: at Microsoft.Synchronization.CoreInterop.ISyncSession.Start(CONFLICT_RESOLUTION_POLICY resolutionPolicy, _SYNC_SESSION_STATISTICS& pSyncSessionStatistics)
at Microsoft.Synchronization.KnowledgeSyncOrchestrator.DoOneWaySyncHelper(SyncIdFormatGroup sourceIdFormats, SyncIdFormatGroup destinationIdFormats, KnowledgeSyncProviderConfiguration destinationConfiguration, SyncCallbacks DestinationCallbacks, ISyncProvider sourceProxy, ISyncProvider destinationProxy, ChangeDataAdapter callbackChangeDataAdapter, SyncDataConverter conflictDataConverter, Int32& changesApplied, Int32& changesFailed)
at Microsoft.Synchronization.KnowledgeSyncOrchestrator.DoOneWayKnowledgeSync(SyncDataConverter sourceConverter, SyncDataConverter destinationConverter, SyncProvider sourceProvider, SyncProvider destinationProvider, Int32& changesApplied, Int32& changesFailed)
at Microsoft.Synchronization.KnowledgeSyncOrchestrator.Synchronize()
at Microsoft.Synchronization.SyncOrchestrator.Synchronize()
at MyApplication.Library.SynchronizationHelper.SynchronizeProviders() in C:\My Documents\Visual Studio 2010\Projects\MyApplication\MyApplication\Library\SynchronizationHelper.cs:line 43
at MyApplication.ViewModels.MainViewModel.SynchronizeDatabases() in C:\My Documents\Visual Studio 2010\Projects\MyApplication\MyApplication\ViewModels\MainViewModel.cs:line 46
I have enabled trace info but, that doesn't seem to provide any helpful information in this case.
Can anyone make a suggestion as to how I might be able to figure out what is causing this error?
Thanks in advance for any help you can provide.
Here is the code that handles syncing:
public void SynchronizeProviders()
{
CeDatabase localDb = new CeDatabase();
localDb.Location = Directory.GetCurrentDirectory() + "\Data\SYNCTESTING5.sdf";
RelationalSyncProvider localProvider = ConfigureCeSyncProvider(localDb.Connection);
MyAppKnowledgeSyncProvider srcProvider = new MyAppKnowledgeSyncProvider();
localProvider.MemoryDataCacheSize = 5000;
localProvider.BatchingDirectory = "c:\batchingdir";
srcProvider.BatchingDirectory = "c:\batchingdir";
SyncOrchestrator orchestrator = new SyncOrchestrator();
orchestrator.LocalProvider = localProvider;
orchestrator.RemoteProvider = srcProvider;
orchestrator.Direction = SyncDirectionOrder.UploadAndDownload;
CheckIfProviderNeedsSchema(localProvider as SqlCeSyncProvider, srcProvider);
SyncOperationStatistics stats = orchestrator.Synchronize();
}
And here is the KnowledgeSyncProviderClass that is used to create srcProvider:
class MyAppKnowledgeSyncProvider : KnowledgeSyncProvider, IDisposable
{
protected MyAppSqlSync.IMyAppSqlSync proxy;
protected SyncIdFormatGroup idFormatGroup;
protected DirectoryInfo localBatchingDirectory;
protected bool disposed = false;
private string batchingDirectory = Environment.ExpandEnvironmentVariables("%TEMP%");
public string BatchingDirectory
{
get { return batchingDirectory; }
set
{
if (string.IsNullOrEmpty(value))
{
throw new ArgumentException("value cannot be null or empty");
}
try
{
Uri uri = new Uri(value);
if (!uri.IsFile || uri.IsUnc)
{
throw new ArgumentException("value must be a local directory");
}
batchingDirectory = value;
}
catch (Exception e)
{
throw new ArgumentException("Invalid batching directory.", e);
}
}
}
public MyAppKnowledgeSyncProvider()
{
this.proxy = new MyAppSqlSync.MyAppSqlSyncClient();
this.proxy.Initialize();
}
public override void BeginSession(SyncProviderPosition position, SyncSessionContext syncSessionContext)
{
this.proxy.BeginSession(position);
}
public DbSyncScopeDescription GetScopeDescription()
{
return this.proxy.GetScopeDescription();
}
public override void EndSession(SyncSessionContext syncSessionContext)
{
this.proxy.EndSession();
if (this.localBatchingDirectory != null)
{
this.localBatchingDirectory.Refresh();
if (this.localBatchingDirectory.Exists)
{
this.localBatchingDirectory.Delete(true);
}
}
}
public override ChangeBatch GetChangeBatch(uint batchSize, SyncKnowledge destinationKnowledge, out object changeDataRetriever)
{
MyAppSqlSync.GetChangesParameters changesWrapper = proxy.GetChanges(batchSize, destinationKnowledge);
changeDataRetriever = changesWrapper.DataRetriever;
DbSyncContext context = changeDataRetriever as DbSyncContext;
if (context != null && context.IsDataBatched)
{
if (this.localBatchingDirectory == null)
{
string remotePeerId = context.MadeWithKnowledge.ReplicaId.ToString();
string sessionDir = Path.Combine(this.batchingDirectory, "MyAppSync_" + remotePeerId);
this.localBatchingDirectory = new DirectoryInfo(sessionDir);
if (!this.localBatchingDirectory.Exists)
{
this.localBatchingDirectory.Create();
}
}
string localFileName = Path.Combine(this.localBatchingDirectory.FullName, context.BatchFileName);
FileInfo localFileInfo = new FileInfo(localFileName);
if (!localFileInfo.Exists)
{
byte[] remoteFileContents = this.proxy.DownloadBatchFile(context.BatchFileName);
using (FileStream localFileStream = new FileStream(localFileName, FileMode.Create, FileAccess.Write))
{
localFileStream.Write(remoteFileContents, 0, remoteFileContents.Length);
}
}
context.BatchFileName = localFileName;
}
return changesWrapper.ChangeBatch;
}
public override FullEnumerationChangeBatch GetFullEnumerationChangeBatch(uint batchSize, SyncId lowerEnumerationBound, SyncKnowledge knowledgeForDataRetrieval, out object changeDataRetriever)
{
throw new NotImplementedException();
}
public override void GetSyncBatchParameters(out uint batchSize, out SyncKnowledge knowledge)
{
MyAppSqlSync.SyncBatchParameters wrapper = proxy.GetKnowledge();
batchSize = wrapper.BatchSize;
knowledge = wrapper.DestinationKnowledge;
}
public override SyncIdFormatGroup IdFormats
{
get
{
if (idFormatGroup == null)
{
idFormatGroup = new SyncIdFormatGroup();
idFormatGroup.ChangeUnitIdFormat.IsVariableLength = false;
idFormatGroup.ChangeUnitIdFormat.Length = 1;
idFormatGroup.ReplicaIdFormat.IsVariableLength = false;
idFormatGroup.ReplicaIdFormat.Length = 16;
idFormatGroup.ItemIdFormat.IsVariableLength = true;
idFormatGroup.ItemIdFormat.Length = 10 * 1024;
}
return idFormatGroup;
}
}
public override void ProcessChangeBatch(ConflictResolutionPolicy resolutionPolicy, ChangeBatch sourceChanges, object changeDataRetriever, SyncCallbacks syncCallbacks, SyncSessionStatistics sessionStatistics)
{
DbSyncContext context = changeDataRetriever as DbSyncContext;
if (context != null && context.IsDataBatched)
{
string fileName = new FileInfo(context.BatchFileName).Name;
string peerId = context.MadeWithKnowledge.ReplicaId.ToString();
if (!this.proxy.HasUploadedBatchFile(fileName, peerId))
{
FileStream stream = new FileStream(context.BatchFileName, FileMode.Open, FileAccess.Read);
byte[] contents = new byte[stream.Length];
using (stream)
{
stream.Read(contents, 0, contents.Length);
}
this.proxy.UploadBatchFile(fileName, contents, peerId);
}
context.BatchFileName = fileName;
}
SyncSessionStatistics stats = this.proxy.ApplyChanges(resolutionPolicy, sourceChanges, changeDataRetriever);
sessionStatistics.ChangesApplied += stats.ChangesApplied;
sessionStatistics.ChangesFailed += stats.ChangesFailed;
}
public override void ProcessFullEnumerationChangeBatch(ConflictResolutionPolicy resolutionPolicy, FullEnumerationChangeBatch sourceChanges, object changeDataRetriever, SyncCallbacks syncCallbacks, SyncSessionStatistics sessionStatistics)
{
throw new NotImplementedException();
}
~MyAppKnowledgeSyncProvider()
{
Dispose(false);
}
#region IDisposable Members
public virtual void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
if (this.proxy != null)
{
CloseProxy();
}
}
disposed = true;
}
}
public virtual void CloseProxy()
{
if (this.proxy != null)
{
this.proxy.Cleanup();
ICommunicationObject channel = proxy as ICommunicationObject;
if (channel != null)
{
try
{
channel.Close();
}
catch (TimeoutException)
{
channel.Abort();
}
catch (CommunicationException)
{
channel.Abort();
}
}
this.proxy = null;
}
}
#endregion
}

Bizarrely, it has just started working.
I got a notification within Visual Studio 2010 that I should "update components" or "install components". It installed some web components.
Now, my code runs without error.
While I am very glad to be past this error, I am getting past it in a very unsatisfying way.
Well. I'll take what I can get.

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Get Windows Firewall prompt for console app but not service - c#

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WebView How to run even when app is in background/closed (foreground service active)

Identify processes that are using CLR

Using SharpSvn to retrieve log revisions got Disk issue

Dynamically loading assemblies and instantiating types using reflection

Getting a System.Error when attempting to Sync using batching in Sync Framework

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