Iván Rodríguez's questions

I'm using Environment.Exit() in the OnClosing event to make sure no threads are zombied when I close my app, and it's fine, that works. The problem is that every now and then closing the app throws an exception that I can't control.

Unhandled exception of type 'System.ComponentModel.Win32Exception' in System.Windows.Forms.dll

Failed to create window handle.

I have tried to use Try/catch but it doesn't help, the exception keeps throwing.

Does anyone know how I can properly handle this situation?

This is the code that is giving me the problem:

public void OnClosing(FormClosingEventArgs e)
{

       if (MessageBox.Show("Desea cerrar el programa?", "Advertencia",
        MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
       {
           e.Cancel = true;
           return;//no salir
       }
        
        try
        {
            Environment.Exit(Environment.ExitCode);//--> aquí se produce la excepción (Error al crear identificador de)
        }
        catch (System.ComponentModel.Win32Exception ex)
        {
            string message = "AppClose::OnClosing()-> " + ex.Message + " Error code: " + ex.ErrorCode;
            MessageBox.Show(message, "Advertencia", MessageBoxButtons.OK, MessageBoxIcon.Error);                
        }       
}

Thank you very much!!

I am using the following code to drop my database tables.

"DROP TABLE IF EXISTS TableName;"

The tables are deleted but I have noticed that the data is still inside the file. That is, after executing this command I would expect my file to have zero bytes, yet the file does not lose a single byte of its size.

Is there a way to delete the table and also all the data in that table?

I am trying to do operator overloading on a class. I was guided by the example that Microsoft gives on its page.

Operator overloading (C# reference)

But I'm getting some errors and I don't know how to fix it:

DataObject.cs(8,49): Error CS1002: Expected ; DataObject.cs(8,57): Error CS1519: The token '+' is invalid in a class, struct, or interface member declaration DataObject.cs(8,65): Error CS1519: The token ';' is not valid in a class, struct, or interface member declaration

This is my code:

//-------------------------------------------------- 

public class DataObject<T> 
{
    private T data;
    public static DataObject<T> operator +(DataObject<T> b) => data + b.data;
}

//-------------------------------------------------- 

public class Int : DataObject<int>
{ 

}

//-------------------------------------------------- 

public class Calcula
{
    public Int Suma(Int a, Int b)
    {
        return a + b;
    }

    public void Suma(Int a, Int b, Int result)
    {
        result = a + b;
    }
}

//-------------------------------------------------- 

public class EntryPoint
{
    static void Main()
    {
        Int a = new Int();
        Int b = new Int();
        Int result = new Int();

        Calcula calcula = new Calcula();

        a = 5;
        b = 7;

        calcula.Suma(a, b, result);
        Console.Write("\n result=" + result);


        a = 3;
        b = 6;

        result = calcula.Suma(a, b);
        Console.Write("\n result=" + result);        

    }
}

Could someone tell me how to do this correctly? Thank you so much!!

I have these two lists:

List<IEvent> iEvent = new List<IEvent>();
List<IEventListener> listeners = new List<IEventListener>();

And I wanted to replace them with two dictionaries.

private Dictionary<IEvent, Action<EventInfo, Type, Property> eventSender;
private Dictionary<IEventListener,Action<EventInfo, Type, Property>> eventListerner;

This was the original function to add EventSenders:

public void AddSender(IEvent sender)
{       
    if (!iEvent.Contains(sender))
    {
        iEvent.Add(sender);
        isEventAdded = true;
    }
}

And I wanted to replace it with this because sometimes I am interested in knowing which object the event belongs to:

public void AddSender(IEvent sender)
{
    eventSender.Add(sender, sender.OnEvent); //-->error
}

I have an error message telling me that "sender.OnEvent" can only go to the left of += or -=

Exactly the same thing happens to me with the function of adding Listeners

public void AddListener(IEventListener listener)
{
    listeners.Add(listener);
    
    foreach (IEvent sender in iEvent)
    {
        sender.OnEvent += listener.Listen;                      
    }
}

Is there any way I can add "sender.OnEvent" in the dictionary?

Thank you very much!!

//------------------------------------------------ ---

UPDATE:

//------------------------------------------------ --

OnEven comes from this interface:

public interface IEvent 
{
    public event Action<EventInfo, EntityEvent.Type, EntityEvent.Property> OnEvent;
    public void SendEvent(EventInfo sendInfo, EntityEvent.Type eventType, Property property);
}

//------------------------------------------------ ---

The problem has something to do with the interface or the class that implements it because I have declared the following within the same class where the AddListener() function is and it does not give me any error...

public event Action<EventInfo, EntityEvent.Type, EntityEvent.Property> tmp;

//------------------------------------------------ --------

The difference I see is that one is abstract and the other is not...

Any ideas?

I have an interface and I have declared a structure inside it. I want the interface to handle events. At first I had it like this:

public interface IEventInfo
{
    public int Health { set; get; }    
    public int Lives { set; get; }      
    public int Damage { set; get; }     
    public int Coin { set; get; }     
    public int Tokens { set; get; }     
    public int Score { set; get; }      
    public string Power { set; get; }  
    public string Weapon { set; get; }  
    public string Armor { set; get; }   

}

But after using it in a couple of classes I have thought that it would be much more comfortable, tidy and clean if I did it this way.

public interface IEventInfo
{
    public struct SData
    {
        public int Health;     
        public int Lives;      
        public int Damage;    
        public int Coin;       
        public int Tokens;     
        public int Score;      
        public string Power;  
        public string Weapon;  
        public string Armor;   
    }
    public SData Data { set; get; }
}

And so I would only have to implement the following in all my classes.

public SData Data { set; get; }

The issue is that it is giving me an error when trying to access the value of the variables:

public class myClass : MonoBehaviour, IEventInfo
{
      public SData Data { set; get; }

      public myClass()
      {
        Data = new IEventInfo.SData();

        Data.Health = 100; 
        Data.Lives = 1;
        Data.Damage = 10;
        Data.Coin = 5;
        Data.Tokens = 1;
        Data.Score = 50;
      }
}

Compiler error CS1612 Cannot modify return value of 'expression' because it is not a variable

I go to the error page

And it tells me the following:

To modify the structure, first assign it to a local variable, modify the variable, and then assign the variable back to the collection element.

I do this but the error persists:

Data = new IEventInfo.SData();

int tmp = Data.Health;
tmp = 100;
Data.Health = tmp; 

Does anyone know how to do it correctly? Thank you so much!!

I'm trying to implement a variable from an interface and I can't do it... with functions it works great but with variables it gets stuck as if I were in an infinite loop.

///-------------------------------------------------- 

public interface Interface
{
    string Func();
    int id {get;set;}   
}

///-------------------------------------------------- 

public class Implemetador : Interface
{   
    public Implemetador(){}

    string Func() //-->sin problemas
    {
       return "id=";
    }

    public int id  //-->bloqueado
    {
        set{id = value;}
        get{return 55;}     
    }
}

///--------------------------------------------------

public class Test
{
    static void Main()
    {
        Implemetador i = new Implemetador();                
        Console.Write(i.Func() + i.id);  
    }
}

///-------------------------------------------------- 

The way to implement it I got from here page 16.

https://profesorezequielruizgarcia.files.wordpress.com/2014/10/poo-csharp.pdf

I think they are notes from some university and it doesn't give errors when compiling so I don't understand why it doesn't work...

Any idea what it could be?

How do you do a casting of a geric class?

I am trying the following but it doesn't work. This is the error that is giving me

CS0119 C# 'Entity' is type, which is not valid in the given context

//-----------------------------------------------------------------
//DataBase: Es un tipo génerico
public class Entity<DataBase> : MonoBehaviour where DataBase : class
{
    [SerializeField] private DataBase dataBase;
}
//-----------------------------------------------------------------
//EnemyDataBase: Es un tipo específico
public class Enemy : Entity<EnemyDataBase>
{
    EnemyDataBase enemyDataBase;
}
//-----------------------------------------------------------------
//DataBase: Es un tipo génerico
public class State <DataBase> where DataBase : class
{
   protected Entity<DataBase> entity;

   Public method(Entity<DataBase> entity)
   {
   }
}
//-----------------------------------------------------------------
public class MyEnemy : Enemy
{
   State state;
   Public void Start()
   {
         state = new State();

         state.method( Entity<EnemyDataBase> this);      // --> asi no funciona
         state.method( (Entity)<EnemyDataBase> this);    // --> asi no funciona
         state.method( ((Entity)<EnemyDataBase>) this);  // --> asi no funciona
   }
}
//-----------------------------------------------------------------

Thank you very much!!

I have created a dictionary as seen in the code below. It's been the only way I've found to get the value of the variable "myCondition" to be updated inside the Tvalue field of the dictionary.

public class MyClass
{       
    delegate bool Delegate();
    Dictionary<string, Delegate> map;
    bool myCondition;

    public MyClass()
    {
        map = new Dictionary<string, Delegate>();
        map.Add("key", MyDelegate); 
    }       

    public bool MyDelegate()
    {
        return myCondition;
    }
 }

I would like to be able to dispense with the function MyDelegate()and put the variable " myCondition " directly in the dictionary... Basically what I want is to pass a pointer to that variable, but from what I have seen in C# pointers are almost "prohibited" .

I have thought that perhaps some kind of casting can be done and convert that variable into a function and thus pass it through a delegate... something like the following code:

public class MyClass
{        
    delegate bool Delegate();
    Dictionary<string, Delegate> map;
 
    public MyClass()
    {
        map = new Dictionary<string, Delegate>();    
        bool myCondition;
        
        public MyClass()
        {
             map.Add("key", (Delegate)myCondition);
             map.Add("key", (Func)myCondition);
        }   

    }

Is there any way to do something like that? How would it be done?

Thank you!!

I am wondering if it is possible to add cases to a switch at runtime. That is, start with an empty switch like the following:

switch (opcion)
        {
            default:
                 break;
        }

And then add cases if necessary

switch (opcion)
        {
            case Case1:
                {
                  break;
                }

                .....
                .....
                .....
            case CaseN:
                {

                    break;
                }
            default:
                 break;
        }

Say that I have made a code that "emulates" (more or less) what I want to do and it is the following:

//--------------------------------------------------------------
public class DinamicSwith<T> where T : IComparable
{
    public delegate T Delegate();
    public List<Delegate> caseList;
    public List<T> option;
    public Delegate Default;
    T defaultReturn;
    bool isDefaultSet;

    public DinamicSwith(T defaultReturn)
    {
        caseList = new List<Delegate>();
        option = new List < T >();
        this.defaultReturn = defaultReturn;
    }
    public void AddCase(Delegate func, T option)
    {        
        caseList.Add(func);
        this.option.Add(option);
    }
    public void AddDefault(Delegate func)
    {
        Default = func;
        isDefaultSet = true;
    }
    public T Execute(T option)
    {
        for (int i = 0; i < caseList.Count; i++)
        {
            if (this.option[i].CompareTo(option)==0)
            {
                return caseList[i]();
            }
        }

        if(isDefaultSet)    
            Default();

        return defaultReturn;
    }
}
//--------------------------------------------------------------

What I want to know is if there is any way to do it "by default"... that is, a method that provides you with the C# language itself (a simpler and more efficient way). Thank you!!

I would like to know if it is possible to modify the members of a structure or class from a derived class (add or remove members dynamically)

public class Base 
{ 
    public struct MyStruct
    {
        public Type originalVar;
    }
    MyStruct myStruct;
}

public class Derivada : Base 
{ 
    public ModificaEnum()
   { 
         //algo asi sería genial
         MyStruct.Add(Type, nuevaVar);
         MyStruct.Remove(Type, originalVar);
    }

}

I would like to prevent the default icon from appearing when an image is not found in an element < img >. The text of the alt property does not matter to me as much but if I can also prevent it from coming out much better.

This is my element (the src property is set dynamically):

<img id="img_id" alt="0">

And this is how it looks without images and with images

Would anyone know how to do this?

How do I call the function named "method()" belonging to class A and not to class B?

    class A
    {
    	constructor() 
    	{
        }
    
        metodo()
        {
          this.virtual();
        }
    
        virtual()
        {
          console.log("Original"); 
        }
    }
    	
    class B extends A
    {
    	constructor()
    	{
        super();
        }

        metodo()
        {
        }
    
        virtual()
        {
          console.log("Sustituto"); 
        }
    }
    
    b = new B();    
    b.metodo();

The desired output obtained should be this:

Sustituto

Today I have opened Chrome to work on a page that I am making and this message appears in the console.

0.html:1 Unchecked runtime.lastError: The message port closed before a response was received.

It more or less says...

No comprobado el último error en tiempo de ejecución: El puerto del mensaje se cerró antes de recibir la respuesta.

Yesterday I didn't see this message, so I created 0.html which is a blank document (no code) and this message keeps appearing, so I think it must be a browser problem or something.

Does anyone know what it is or better yet how to make it not appear?

Is this error going to affect the debugging of the page?

I'm trying to check if a directory exists, and if not, create it, but the page doesn't work for me when I use the file_existsor functions is_dir.

I have tried like this:

if(!file_exists( $path )
    mkdir($path);

And so:

if(!is_dir ( $path )
    mkdir( $path );

And I have also tried to put the pathwith different formats:

According to the documentation, if I'm on Windows I should do it like this:

$path= "C://Apache24/htdocs/uploads/carpeta"

Although I have also tried to do it like this:

$path ="C:/Apache24/htdocs/uploads/carpeta"

And so

$path= "./uploads/carpeta"

Even so:

$path= $_SERVER['DOCUMENT_ROOT']."/uploads/carpeta"

In all cases it fails. Locally I am working on Windows but I guess when I upload it to the server it will have to run on Linux .

Why do these functions fail? How is it solved?

I am using Selenium and Python, and have run into this problem. I have to upload an image to the server and I don't see the way.

The HTML code is this.

<a id="file_upload" href="javascript:;">Añadir imágenes</a>

When you click on this link, the typical system window for selecting files opens.

At the moment the only thing I have managed to do is locate the element and click on it.

 img_upload = driver.find_element_by_id("file_upload")
 img_upload .click()

I have also tried like this but nothing happens

img_upload = driver.find_element_by_id("file_upload")
img_upload.send_keys(img_path)

Any idea how to upload the image?

Well, I know this is crazy because it's coded... but it's the JavaScript code snippet that controls uploading the file... I'm posting it for what it's worth.

function s() {
    var e, s;
    i.extend(this, {
        init: function(u) {
            var c, l, d, m, h, f, p = this,
                g = p.getRuntime();

            e = u, d = o.extList2mimes(e.accept, g.can("filter_by_extension")),
                l = g.getShimContainer(),

                l.innerHTML = '<input id="' + g.uid + '" type="file" style="font-size:999px;
            opacity: 0;
            "'+(e.multiple&&g.can("
            select_multiple ")?"
            multiple ":"
            ")+               
            (e.directory && g.can("select_folder") ?
                "webkitdirectory directory" : "") +
            (d ? ' accept="' + d.join(",") + '"' : "") + " />",
            c = n.get(g.uid), i.extend(c.style,

                    {
                        position: "absolute",
                        top: 0,
                        left: 0,
                        width: "100%",
                        height: "100%"
                    }), m = n.get(e.browse_button), s = n.getStyle(m, "z-index") || "auto", g.can("summon_file_dialog") && ("static" === n.getStyle(m, "position") &&

                    (m.style.position = "relative"), r.addEvent(m, "click", function(e) {
                        var t = n.get(g.uid);
                        t && !t.disabled &&

                            t.click(), e.preventDefault()
                    }, p.uid), p.bind("Refresh", function() {
                        h = parseInt(s, 10) || 1, n.get(e.browse_button).style.zIndex = h, this.getRuntime().getShimContainer().style.zIndex = h - 1
                    })), f = g.can("summon_file_dialog") ? m : l, r.addEvent(f, "mouseover", function()

                    {
                        p.trigger("mouseenter")
                    }, p.uid), r.addEvent(f, "mouseout", function()

                    {
                        p.trigger("mouseleave")
                    }, p.uid), r.addEvent(f, "mousedown", function()

                    {
                        p.trigger("mousedown")
                    }, p.uid), r.addEvent(n.get(e.container), "mouseup", function() {
                    p.trigger("mouseup")
                }, p.uid),

                (g.can("summon_file_dialog") ? c : m).setAttribute("tabindex", -1), c.onchange = function x() {
                    if (p.files = [], i.each(this.files, function(i) {
                            var n = "";
                            return e.directory && "." == i.name ? !0 : (i.webkitRelativePath && (n = "/" + i.webkitRelativePath.replace(/^\//, "")), i = new t(g.uid, i), i.relativePath = n, p.files.push(i), void

                                0)
                        }), "IE" !== a.browser && "IEMobile" !== a.browser) this.value = "";
                    else {
                        var n = this.cloneNode(!0);

                        this.parentNode.replaceChild(n, this), n.onchange = x
                    }
                    p.files.length && p.trigger("change")
                }, p.trigger({
                    type: "ready",
                    async: !0
                }), l = null
        },
        setOption: function(e, t) {
            var i = this.getRuntime(),
                r = n.get(i.uid);
            switch (e) {
                case "accept":
                    if (t) {
                        var

                            a = t.mimes || o.extList2mimes(t, i.can("filter_by_extension"));
                        r.setAttribute("accept", a.join(","))
                    } else

                        r.removeAttribute("accept");
                    break;
                case "directory":
                    t && i.can("select_folder") ? (r.setAttribute("directory", ""), r.setAttribute("webkitdirectory", "")) : (r.removeAttribute("directory"), r.removeAttribute("webkitdirectory"));
                    break;
                case "multiple":
                    t && i.can("select_multiple") ? r.setAttribute("multiple", "") : r.removeAttribute("multiple")
            }
        },
        disable: function(e) {
            var t, i = this.getRuntime();
            (t = n.get(i.uid)) && (t.disabled = !!e)
        },
        destroy: function() {
            var

                t = this.getRuntime(),
                i = t.getShim(),
                o = t.getShimContainer(),
                a = e && n.get(e.container),
                u = e && n.get(e.browse_button);
            a && r.removeAllEvents(a, this.uid), u &&

                (r.removeAllEvents(u, this.uid), u.style.zIndex = s), o &&

                (r.removeAllEvents(o, this.uid), o.innerHTML = ""), i.removeInstance(this.uid), e = o = a = u = i = null
        }
    })
}
return e.FileInput = s
}), n("moxie/runtime/html5/file/FileDrop",

        ["moxie/runtime/html5/Runtime", "moxie/file/File", "moxie/core/utils/Basic", "moxie/core/utils/Dom", "moxie/core/utils/Events", "moxie/core/utils/Mime"],
        function(e, t, i, n, r, o) {
            function a() {
                function e(e) {
                    if (!e.dataTransfer || !e.dataTransfer.types) return !1;
                    var

                        t = i.toArray(e.dataTransfer.types || []);
                    return -1 !== i.inArray("Files", t) || -1 !== i.inArray("public.file-url", t) || -1 !== i.inArray("application/x-moz-file", t)
                }

                function a(e, i) {
                    if (u(e)) {
                        var n = new

                        t(f, e);
                        n.relativePath = i || "", p.push(n)
                    }
                }

                function s(e) {
                    for (var t = [], n = 0; n < e.length; n++)[].push.apply(t, e[n].extensions.split(/\s*,\s*/));
                    return -1 === i.inArray("*", t) ? t : []
                }

                function u(e) {
                    if (!g.length) return !0;
                    var t = o.getFileExtension(e.name);
                    return !t || -1 !== i.inArray(t, g)
                }

                function c(e, t) {
                    var n = [];
                    i.each(e, function(e) {
                        var t = e.webkitGetAsEntry();

                        t && (t.isFile ? a(e.getAsFile(), t.fullPath) : n.push(t))
                    }), n.length ? l(n, t) : t()
                }

                function l(e, t) {
                    var n = [];
                    i.each(e, function(e) {
                        n.push(function(t) {
                            d(e, t)
                        })
                    }), i.inSeries(n, function() {
                        t()
                    })
                }

                function d(e, t)


                {
                    e.isFile ? e.file(function(i) {
                        a(i, e.fullPath), t()
                    }, function() {
                        t()
                    }) : e.isDirectory ? m(e, t) : t()
                }

                function m(e, t) {
                    function i(e) {
                        r.readEntries(function(t) {
                            t.length ? ([].push.apply(n, t), i(e)) : e()
                        }, e)
                    }
                    var n = [],
                        r = e.createReader();
                    i(function() {
                        l(n, t)
                    })
                }
                var h, f, p = [],
                    g = [];
                i.extend(this, {
                    init: function(t) {
                        var n, o = this;

                        h = t, f = o.ruid, g = s(h.accept), n = h.container, r.addEvent(n, "dragover", function(t) {
                            e(t) && (t.preventDefault(), t.dataTransfer.dropEffect = "copy")
                        }, o.uid), r.addEvent(n, "drop", function(t) {
                            e(t) && (t.preventDefault(), p = [], t.dataTransfer.items && t.dataTransfer.items[0].webkitGetAsEntry ? c(t.dataTransfer.items, function() {
                                o.files = p, o.trigger("drop")
                            }) : (i.each(t.dataTransfer.files, function(e) {
                                a(e)
                            }), o.files = p, o.trigger("drop")))
                        }, o.uid), r.addEvent(n, "dragenter", function() {
                            o.trigger("dragenter")
                        }, o.uid), r.addEvent(n, "dragleave", function() {
                            o.trigger("dragleave")
                        }, o.uid)
                    },
                    destroy: function() {
                        r.removeAllEvents(h && n.get(h.container), this.uid), f = p = g = h = null, this.getRuntime().getShim().removeInstance(this.uid)
                    }
                })
            }
            return e.FileDrop = a
        }), n("moxie/runtime/html5/file/FileReader", ["moxie/runtime/html5/Runtime", "moxie/core/utils/Encode", "moxie/core/utils/Basic"], function(e, t, i) {
            function n() {
                function e(e) {
                    return t.atob(e.substring(e.indexOf("base64,") + 7))
                }
                var n, r = !1;
                i.extend(this, {
                    read: function(t, o) {
                        var a = this;
                        a.result = "", n = new window.FileReader, n.addEventListener("progress", function(e) {
                                a.trigger(e)
                            }), n.addEventListener("load", function(t) {
                                a.result = r ? e(n.result) : n.result, a.trigger(t)
                            }), n.addEventListener("error", function(e) {
                                a.trigger(e, n.error)
                            }), n.addEventListener("loadend", function(e) {
                                n = null, a.trigger(e)
                            }), "function" === i.typeOf(n[t]) ? (r = !1, n[t](o.getSource())) : "readAsBinaryString" === t &&

                            (r = !0, n.readAsDataURL(o.getSource()))
                    },
                    abort: function() {
                        n && n.abort()
                    },
                    destroy: function() {
                        n = null, this.getRuntime().getShim().removeInstance(this.uid)
                    }
                })
            }
            return

I have a problem with this function. I am trying to remove trailing whitespace from a pointer of type char*.

Something like that:

char *ptr = "Soy un puntero dinámico y me sobran espacios al final       ";

With the difference that this one is static and the one I am handling is dynamic.

I was doing this function for it but for some reason that I can't see, the while is not working for me, that is to say that the value of c is c=0; when I should be older.

char *quita_espacios_al_final(char **s)
{
    char *p = *s;
    if(p==NULL)return NULL;

    unsigned int i=strlen(p);
    unsigned int k=i;  


    unsigned int c=0;

    while( *(p+i)==' ' &&  i>0)
    {           
        i--;
        c++;
    }

    char *tmp = new char [k-c+1];

    for(unsigned int j=0; j<k-c; j++)
        *(tmp+j)=*(p+j);        

    delete [] p;
    return tmp;
}

Any ideas why it doesn't work? o Another alternative to count whitespace at the end of the string? PS: I don't care if it's in C or C++ as long as it works, but I can't change the type, it has to be (char*).

I want to get a part of a string. The string can have this format:

Parte1 - Parte2[Parte3]

Or it can also have this other format:

Parte1[Parte2]

With the first format I had no problems, I was using this function and everything was fine. In this case I wanted to extract Part2.

def GetPart(string):
  x = string.split("-")
  y = x[1].split("[")
return y[0]

The problem appears when I want to use this function for the second format, I would like to catch the exception that is thrown conditionally so that if it can't handle the first format it will handle the second.

Something more or less like this:

def GetPart(string):     
  try
   x = string.split("-")
   y = x[1].split("[")
   result = y[0]
  except IndexError: pass

  try
   x = string.split("[")
   result = y[0]
  except IndexError as e:
    print( "A retriable error occurred: %s" % e)

  return result

I would like that if there are no exceptions in the first try to go directly to the return and not do the second try.

I tried to do it with goto like so:

def GetPart(string):     
  try:
   x = string.split("-")
   y = x[1].split("[")
   result = y[0]
  goto .fin
  except IndexError: pass

  try:
   x = string.split("[")
   result = y[0]
  except IndexError as e:
   print( "A retriable error occurred: %s" % e)

  label .fin
  return result

But either I'm doing it wrong or they've removed the python goto because it doesn't work.

Can this be done? And if it can be done, how is it done?

It happens to me that 90% of the python scripts that I download have outdated libraries and they don't work for me, and I have to search for the new version of the library and install it with.

pip install modulo

And yet version incompatibility bugs often pop up and I'm forced to edit the code (sometimes lucky and sometimes not).

I wonder if there is any program that resolves dependencies in python. That is, read the script, resolve the dependencies by calling 'pip' and also modify the code so that, for example, it updates the differences between python 2 and python 3.

To say that I have tried to use a program called Py2to3 but this is also outdated and does not work (and although it will work, it would not do everything I say either).

What a mess of language, on the one hand it's great because with 3 lines you do what you would do with three pages with C++, and it also has a lot of very useful libraries that you hardly find for C++. But on the other hand they make so many changes to the language and to the libraries that you don't know if a program you write today will work for you in a month.

Well, if such a tool existed, it would be a point in favor for this language. Does anyone know if it exists?

I wanted to check a huge list of proxies that I have because I am only interested in the ones that use the https (SSL) protocol and the ones that are not from China. Looking for a quick way to do it I came across this function.

string proxyWorks(string ip, int port, string proxytype="")
{

    CURL *ch;
    CURLcode res;
    ch = curl_easy_init();

    if(!ch)
    return "chfail";


    curl_easy_setopt(ch, CURLOPT_URL, "http://google.com/");
    curl_easy_setopt(ch, CURLOPT_FOLLOWLOCATION, true);
    curl_easy_setopt(ch, CURLOPT_TIMEOUT, 15);
    curl_easy_setopt(ch, CURLOPT_USERAGENT, "Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 5.1; InfoPath.2; SLCC1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 2.0.50727)2011-09-08 13:55:49");


    if(proxytype=="http")
        curl_easy_setopt(ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);

    if(proxytype=="socks4")
        curl_easy_setopt(ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);

    if(proxytype=="socks4a")
        curl_easy_setopt(ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);

    if(proxytype=="socks5")
        curl_easy_setopt(ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);

    if(proxytype=="https")
        curl_easy_setopt(ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);



    curl_easy_setopt(ch, CURLOPT_PROXY, ip.c_str());
    curl_easy_setopt(ch, CURLOPT_PROXYPORT, port);
    curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, writer);
    curl_easy_setopt(ch, CURLOPT_WRITEDATA, &buffer);


    res = curl_easy_perform(ch);
    curl_easy_cleanup(ch);

    if(res == CURLE_OK)
    {
        if(sizeof(buffer)>0)
            return "ok";
        else return "fail";
    }
    else
    return curl_easy_strerror(res);

}

First I tried a couple of IPs on a website to check the result it should give me. This website ( https://hidemy.name/es/proxy-checker/ ), which by the way if you wonder why I don't do everything on that website is because I have a couple of thousand proxies and that website only lets me put 100 maximum at each time.

Returning to the topic, it turns out that:

If proxytype="" and in all cases I have a positive output (OK)

If proxytype="http" I also have a positive output (OK)

But if proxytype="https" I have a negative output, to be more precise the function curl_easy_strerror(res) returns the following message SSL connect error . (According to the web, this proxy does accept the HTTPS protocol).

The rest of the cases do not interest me so I have not tried them.

I have tried to put " https://google.com/ " instead of " http://google.com/ " but it works worse, that is to say that I do not get any positive case.

I should add that it's my first time using libcurl so that's my level right now with this library (Newbie) :-)

Well, I actually have two questions:

1º- Does anyone know why it is failing with HTTPS connections?

2º-Could you also use this library to filter the IPs by country and eliminate the Chinese ones?

I'm testing the following code with a YouTube video and it hangs when it gets to the Read function ...it doesn't seem to receive any data and after a while the socket disconnects and the app terminates normally.

int MainApp::OnRun()
{
    wxIPV4address addr;

    // address to connect
    wxString host = wxT("www.youtube.com");
    addr.Hostname(host);
    int port = 80;


    addr.Service(port);

    wxSocketClient *socket = new wxSocketClient();

    print(wxT("Connecting..."));

    socket->Connect(addr);

    if (socket->IsConnected())
        print(wxT("Connected to ") + addr.IPAddress());
    else
    {
        print(wxT("Can not connect to ") + host);
        return 1;
    } 

   **wxString request = wxT("GET /watch?v=NAsCGnXJ2cg HTTP/2.0\r\n");**


    // send the request to the server
    socket->Write(request.mb_str(), request.Length());
    print(wxT("Request sent"));


    char c = 0x00;
    wxString data;

    print(wxT("Receiving data..."));

    while( socket->IsConnected() && !socket->Error() )
    {
        // read a char
        socket->Read(&c, 1);

        // append char to string
        data.Append((wxChar)c, 1);

        cout<<c;
    }

    delete socket;

    // print received data
    print(data);
    return 0;
}

I think that what is failing is the request because I have tested the rest of the code on my local server and it works correctly (although it is also true that it was not with streaming).

Does anyone know how to make the request correctly for YouTube to send me the video data?

OK, following the instructions of the person who answered me, I made the request in this way.

wxString request = wxT("GET /watch?v=NAsCGnXJ2cg HTTP/2.0\r\n"

                      "Host: www.youtube.com\r\n"

                      "User-Agent: Chrome/63.0.3239.132\r\n"

                      "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"

                      "Content-Length: 0\r\n"

                      "Content-Type: text/plain;charset=UTF-8\r\n"

                      "\r\n"
                      );

But I have the 400 bad request error...

HTTP/1.0 400 Bad Request

Content-Type: text/html; charset=UTF-8

Referrer-Policy: no-referrer

Content-Length: 1555

Date: Thu, 12 Apr 2018 07:47:44 GM

I've been looking in the chrome developer tools and I've seen this

:authority: www.youtube.com

:method:GET

:path: /watch?v=rg9Dv1no_9c

:scheme: https accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng, / ;q=0.8

accept-encoding: gzip, deflate, br

accept-language: es-ES,es;q=0.9

cache-control: max-age=0

cookie: ...............

upgrade-insecure-requests: 1

user-agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

x-client-data: .............

And based on that I have put together the following petition

wxString request2 = wxT("GET /watch?v=rg9Dv1no_9c HTTP/2.0\r\n"
                        "Host: https://www.youtube.com\r\n"
                        "Content-Type: text/html;charset=UTF-8\r\n"
                        "Accept-Encoding: gzip, deflate, br\r\n"
                        "Accept-Charset: ISO-8859-1,UTF-8;q=0.7,*;q=0.7\r\n"
                        "Connection: keep-alive\r\n"
                        "User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 YaBrowser/18.2.0.284 Yowser/2.5 Safari/537.36\r\n"                            
                        "Cache-Control: max-age=0\r\n"
                        "Accept-Language: es-ES,es;q=0.9\r\n"
                        "Accept-Header: text/html, application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
                        "Upgrade-Insecure-Requests: 1\r\n" 
                         "Cookie: CONSENT=YES+ES.es+20150705-15-0; VISITOR_INFO1_LIVE=gW8EMr6HkB8; _ga=GA1.2.720111899.1436744695; endscreen-metadata-editor-gh=true; PREF=f6=42018&f5=30030&al=es&cvdm=grid&f1=50000000; SID=-gUT0RoqrW6iN-QgLD7uolElo-VW_2haDglvrB4reFtVFwk_pugPpzBzW1osmY5Gi_dS-g.; HSID=A7Yc2Drrdyl-yTKod; SSID=AMJGIbMZN1aWbu7EX; APISID=8eu4DiCJED9s0knC/A0bf8LsHROKIBE5UL; SAPISID=YLeTesbQP5mHdfD7/AuDiu6Z73WjgfW7Kv; LOGIN_INFO=AFmmF2swRAIgXfZGlAUHfvxB9mNWhpjTjVvH_k9DPNuS-mv9x6PZ4EMCIEuiOPCnkmUQ5JGgSl7TTNvrSJ2izUUDUOsnYB2VQZ_R:QUQ3MjNmemdfdUxtLTRRd3pCZ3lRNFQ3c1dDcjhsNEhuR2NzMjlPdEJkMVlUTTZycUM4Zm02ZERkV3AydW1PNDRJN0YyR0x4VHdLekw2ektFSi01M1ljM3ljNHJkaURVNkV6a3JncEJwTktubUlOOUdLRE5wdXlSM0VaVVJPV0p1aFNQOXRORWhiMWdYSVBCTmVIeTdNX3F4STBoUzlCNVVfd0lOZ0JUQk93M01IQmxhQktack80; YSC=JzQQe4Eiqfs\r\n"

                        "\r\n"

                        );

But I keep getting ERROR 400!!

Any ideas? Is there something missing or extra? Any syntax errors?

It's weird because I've seen on some websites that it can be done easily with a much simpler header... (these two for example)

https://www.askapache.com/online-tools/http-headers-tool

http://web-sniffer.net/

They get the HTML of the video page, which I'm interested in reading some interesting facts... but my ultimate goal is to be able to capture the streaming video. If you can guide me a bit with that, that would be great too!