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• Why can I not send more than one request?

  - by Doug

  function stateChanged(idname) { xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById(idname).value = xmlhttp.responseText; } } } function openSend(php,idname) { stateChanged(idname); xmlhttp.open("GET",php,true); xmlhttp.send(); } function showHint() { if (window.XMLHttpRequest) { xmlhttp=new XMLHttpRequest(); } else { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } openSend("time.php", "Time"); openSend("date1.php", "Date1"); openSend("date2.php", "Date2"); return; } These two say aborted (in Firebug) and doesn't return a value. Why is that? Is it because I can't send more than 1 request? openSend("time.php", "Time"); openSend("date1.php", "Date1"); If I can't, how could I achieve 3 requests with only one invocation?

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• How to detect crashing tabed webbrowser and handle it?

  - by David Eaton

  I have a desktop application (forms) with a tab control, I assign a tab and a new custom webrowser control. I open up about 10 of these tabs. Each one visits about 100 - 500 different pages. The trouble is that if 1 webbrowser control has a problem it shuts down the entire program. I want to be able to close the offending webbrowser control and open a new one in it's place. Is there any event that I need to subscribe to catch a crashing or unresponsive webbrowser control ? I am using C# on windows 7 (Forms), .NET framework v4 =============================================================== UPDATE: 1 - The Tabbed WebBrowser Example Here is the code I have and How I use the webbrowser control in the most basic way. Create a new forms project and name it SimpleWeb Add a new class and name it myWeb.cs, here is the code to use. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using System.Security.Policy; namespace SimpleWeb { //inhert all of webbrowser class myWeb : WebBrowser { public myWeb() { //no javascript errors this.ScriptErrorsSuppressed = true; //Something we want set? AssignEvents(); } //keep near the top private void AssignEvents() { //assign WebBrowser events to our custom methods Navigated += myWeb_Navigated; DocumentCompleted += myWeb_DocumentCompleted; Navigating += myWeb_Navigating; NewWindow += myWeb_NewWindow; } #region Events //List of events:http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser_events%28v=vs.100%29.aspx //Fired when a new windows opens private void myWeb_NewWindow(object sender, System.ComponentModel.CancelEventArgs e) { //cancel all popup windows e.Cancel = true; //beep to let you know canceled new window Console.Beep(9000, 200); } //Fired before page is navigated (not sure if its before or during?) private void myWeb_Navigating(object sender, System.Windows.Forms.WebBrowserNavigatingEventArgs args) { } //Fired after page is navigated (but not loaded) private void myWeb_Navigated(object sender, System.Windows.Forms.WebBrowserNavigatedEventArgs args) { } //Fired after page is loaded (Catch 22 - Iframes could be considered a page, can fire more than once. Ads are good examples) private void myWeb_DocumentCompleted(System.Object sender, System.Windows.Forms.WebBrowserDocumentCompletedEventArgs args) { } #endregion //Answer supplied by mo. (modified)? public void OpenUrl(string url) { try { //this.OpenUrl(url); this.Navigate(url); } catch (Exception ex) { MessageBox.Show("Your App Crashed! Because = " + ex.ToString()); //MyApplication.HandleException(ex); } } //Keep near the bottom private void RemoveEvents() { //Remove Events Navigated -= myWeb_Navigated; DocumentCompleted -= myWeb_DocumentCompleted; Navigating -= myWeb_Navigating; NewWindow -= myWeb_NewWindow; } } } On Form1 drag a standard tabControl and set the dock to fill, you can go into the tab collection and delete the pre-populated tabs if you like. Right Click on Form1 and Select "View Code" and replace it with this code. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using mshtml; namespace SimpleWeb { public partial class Form1 : Form { public Form1() { InitializeComponent(); //Load Up 10 Tabs for (int i = 0; i <= 10; i++) { newTab("Test_" + i, "http://wwww.yahoo.com"); } } private void newTab(string Title, String Url) { //Create a new Tab TabPage newTab = new TabPage(); newTab.Name = Title; newTab.Text = Title; //create webbrowser Instance myWeb newWeb = new myWeb(); //Add webbrowser to new tab newTab.Controls.Add(newWeb); newWeb.Dock = DockStyle.Fill; //Add New Tab to Tab Pages tabControl1.TabPages.Add(newTab); newWeb.OpenUrl(Url); } } } Save and Run the project. Using the answer below by mo. , you can surf the first url with no problem, but what about all the urls the user clicks on? How do we check those? I prefer not to add events to every single html element on a page, there has to be a way to run the new urls thru the function OpenUrl before it navigates without having an endless loop. Thanks.

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• Why is $file empty in custom symfony file validator?

  - by codecowboy

  I am setting a custom file validator for a file input field in Symfony 1.4 (Doctrine) $this-setValidator('filename', new sfValidatorFile(array( 'mime_types' = 'web_images', 'path' = sfConfig::get('sf_upload_dir').'/animals', 'validated_file_class' = 'CustomValidatedFile', 'required' =false ))); I then want to override the save method to generate some thumbnails: class CustomValidatedFile extends sfValidatedFile { private $savedFilename; // Override sfValidatedFile's save method public function save($file = null, $fileMode = 0666, $create = true, $dirMode = 0777) { $this-savedFilename = $this-generateFilename(); // This makes sure we use only one savedFilename (it will be the first) if ($this-savedFilename === null ) { $this-savedFilename = $file; } $thumbnail = new sfThumbnail(150,150); $thumbnail-loadFile($this-getTempName()); $thumbnail-save(sfConfig::get('sf_upload_dir').'/thumbnails/thumb_'.$this-savedFilename); // Let the original save method do its magic :) return parent::save($this->savedFilename, $fileMode, $create, $dirMode); } } This fails with the error "The file "" is not readable." This is coming from sfThumbnailPlugin because the value of $file is null. My question is why is $file null?

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• django: Selecting questions that was not asked

  - by Oleg Tarasenko

  Hi, I am creating small django application which holds some few questions (and answers for them) What I want to do is to show user random question, but only from those which was not solved by him yet. I wonder how to do this. For now, I defined user profile model this way: class UserProfile(models.Model): rank = models.IntegerField(default = 1) solvedQ = models.ManyToManyField(Question) user = models.ForeignKey(User, unique=True) So solved problems are added this way: if user.is_authenticated(): profile = user.get_profile() profile.rank += 1 profile.solvedQ.add(Question.objects.get(id=id)) Now if the view must show random question, but not from already solved list... Is there a good way to intersect Questions and solvedQuestions.... so question is chosen from the unsolved list?

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• Finding the attributes on the properties of an instance of a class

  - by Dan

  Given an instance of a class I want to set properties on attributes at runtime. So I tried this, but as far as I can tell this finds the attributes on the class not the instance, so any changes I make to the attribute properties have no effect. var properties = myObject.GetType().GetProperties(); foreach (object prop in properties) { var attribute =prop.GetCustomAttributes(typeof(MyAttribute), true)[0]; //attribute.MyProp do some stuff } If I try using type descriptor like below, there is no way of getting to the attributes on the properties. var myObject= (MyClass) object; PropertyDescriptorCollection props = TypeDescriptor.GetProperties(myObject); //There is no props[0].GetCustomAttributes(

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• Can headers be sent in an AJAX request?

  - by sombe

  Can I call the server to set a new cookie with an AJAX request (that is, after the page has already loaded)? For example, when a visitor hits a link, ajax would open a php file that sets a new cookie like this: setcookie('cookiename', 'true', time()+3000, "/",'...'); But this is done after the html (the page containing the actual <a> tag pressed) was rendered. Is it nevertheless ok to set cookies in ajax? (maybe because the php file loaded is separate from the original html page).

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• Links sometimes not working in WebView

  - by littleFluffyKitty

  On occasion links in the WebView will not respond. The highlight press color will appear around them but nothing happens. I am also using WebViewClient's shouldOverrideUrlLoading and that function is not called when this happens. Edit: I have narrowed this issue down to the following circumstances: The webpage is the first page a WebView opens. The webpage uses meta name="viewport" attribute in the html head The WebView is using WebView.getSettings().setUseWideViewPort(true); Android 2.1 (Doesn't appear to happen in later versions, didn't test earlier) If a webpage meeting those above is opened no links will work. If another similar page is loaded, those links will not work either. It is not until you load a page without meta name="viewport" that links start to work. After a page without that meta attribute is opened and then you load a page with the meta viewport attribute, the links start working.

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• C# Lists, Foreach, and Types

  - by user406470

  I was wondering if there is a version of foreach that checks only for a specific type and returns it. For example consider this class tree: org.clixel.ClxBasic - org.clixel.ClxObject - org.clixel.ClxSprite - WindowsGame1.test Then consider this code public List<ClxBasic> objects = new List<ClxBasic>(); foreach(GroupTester tester in objects) { tester.GroupTesterOnlyProperty = true; } tester.GroupTesterOnlyProperty is a property created in GroupTester. Is there some way to make something like this work, like an overload of foreach, or another snippet that might help me? I want to make it easy for a programmer to sort through the lists grabbing only what type they need.

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• Why do the following expanded if shorthand statements not work in javascript?

  - by PeanutsMonkey

  This is my first attempt to write shorthand if statements however am befuddled by why the expanded versions don't work quite the way I imagined they would. Code 1 - Does not work if(document.getElementById == true) { alert("The document object model is supported by: " + navigator.appName); } Code 2 - Does work if(document.getElementById != false) { alert("The document object model is supported by: " + navigator.appName); } Code 3 - The shorthand that does work if(document.getElementById) { alert("The document object model is supported by: " + navigator.appName); } Why is that if I expand the shorthand in 3 to the first code sample not work and why does it work if I have it equal to != false?

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• How to optimize frame rate in Flash/Actionscript?

  - by LillyWolf

  I'm building an application in Actionscript using Flash assets, and my frame rate becomes very low (~7 fps) when I attempt to render 20+ assets on the screen, even though most of those assets are stopped movie clips. I've tried setting .cacheAsBitmap to true, which helps a bit, but not enough. What else can I do to get the frame rate up? I've noticed that some movie clips seem to impact it more than others, but I'm not sure how to alter them to make them easier to render. Thanks!

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• wpf datagrid on click event

  - by gencay

  I use datagrid table on my project. One of the column of the datagrid is the path of the document according to my project. I would like to do that: When the user clicks the path cell/hyperlink cell, Program will get the path, Program will open another tab. I couldn't see the onclick event for the column, how can i do this? And also how can I switch the tabitems on the same wpf Window? Hyper link column is that: < toolkit:DataGridHyperlinkColumn Header="Path" Binding="{Binding path}" IsReadOnly="True" TargetName="{Binding Path=path}"

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• Check if a variable is empty

  - by Thomas

  I have some user-submitted variables that I want to display in a different part of my site like this: <div class="pre_box">Term: </div> <div class="entry"><?php $key='term'; echo get_post_meta($post->ID, $key, true); ?></div> Occasionally, these variables might be empty in which case I don't want to display the label for the empty variable. In the example above I would want to hide the <div class="pre_box">Term: </div> part. Is there some simple way to check if a php variable like the one above is empty and prevent the label from being displayed?

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• Why is writing a compiler in a functional language so efficient and easier?

  - by wvd

  Hello all, I've been thinking of this question very long, but really couldn't find the answer on Google as well a similar question on Stackoverflow. If there is a duplicate, I'm sorry for that. A lot of people seem to say that writing compilers and other language tools in functional languages such as OCaml and Haskell is much more efficient and easier then writing them in imperative languages. Is this true? And if so -- why is so efficient and easy to write them in functional languages instead of in an imperative language, like C? Also -- isn't a language tool in a functional language slower then in some low-level language like C? Thanks in advance, William v. Doorn

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• How To Configure Query Cacheing in EclipseLink

  - by rustyshelf

  I have a collection of states, that I want to cache for the life of the application, preferably after it is called for the first time. I'm using EclipseLink as my persistence provider. In my EJB3 entity I have the following code: @Cache @NamedQueries({ @NamedQuery( name = "State.findAll", query = "SELECT s FROM State s", hints = { @QueryHint(name=QueryHints.CACHE_USAGE, value=CacheUsage.CheckCacheThenDatabase), @QueryHint(name=QueryHints.READ_ONLY, value=HintValues.TRUE) } ) }) This doesn't seem to do anything though, if I monitor the SQL queries going to MySQL it still does a select each time my Session Bean uses this NamedQuery. What is the correct way to configure this query so that it is only ever read once from the database, preferably across all sessions? Edit: I am calling the query like this: Query query = em.createNamedQuery("State.findAll"); List<State> states = query.getResultList();

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• (this == null) in C#!

  - by SLaks

  Due to a bug that was fixed in C# 4, the following program prints true. (Try it in LINQPad) void Main() { new Derived(); } class Base { public Base(Func<string> valueMaker) { Console.WriteLine(valueMaker()); } } class Derived : Base { string CheckNull() { return "Am I null? " + (this == null); } public Derived() : base(() => CheckNull()) { } } In VS2008 in Release mode, in throws an InvalidProgramException. (In Debug mode, it works fine) In VS2010 Beta 2, it doesn't compile (I didn't try Beta 1); I learned that the hard way Is there any other way to make this == null in pure C#?

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• Code First entity framework connection string

  - by Suneel Dixit

  I have 3 class projects in my solutions. 1. MVC4 project 2. Domain 3. Tests In the MVC4 project I have added a web.config file with the connection string as <add name="EfDbContext" connectionString="Data Source=.;Initial Catalog=SportsStore;Integrated Security=true;" providerName="System.Data.SqlClient"/> I have a class by name EfDbContext in Domain project which inherits DbContext. When I view the website in browser, I get the server not found error. I debugged the EfDbContext class and found that the Database.Connection.ConnectionString is set to \SqlExpress with database as EfDbContext. Why is that?

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• Error showing is NullPointerException [duplicate]

  - by user3659612

  This question already has an answer here: How to check a string against null in java? 11 answers I was trying to code a wifi scanner which does 20 scans but it shows NullPointerException at if(bssid[j].equals(null)){ My code is slightly huge package com.example.scanner; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import android.annotation.SuppressLint; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.wifi.ScanResult; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.ActionBarActivity; import android.view.Menu; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.Toast; public class MainActivity extends ActionBarActivity { WifiManager wifi; WifiScanReceiver wifireciever; WifiInfo info; Button scan, save; List<ScanResult> wifilist; ListView list; String wifis[]; String name; String[] ssid = new String[100]; String[] bssid = new String[100]; int[] lvl = new int[100]; int[] count = new int[100]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main); list=(ListView)findViewById(R.id.listView1); scan=(Button)findViewById(R.id.button1); save=(Button)findViewById(R.id.button2); scan.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE); if (wifi.isWifiEnabled()==false){ wifi.setWifiEnabled(true); } wifireciever = new WifiScanReceiver(); for (int i=0;i<20;i++){ registerReceiver(wifireciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); wifi.startScan(); if (i==19){ Toast.makeText(getBaseContext(), "Scan Finish", Toast.LENGTH_LONG).show(); } } } }); save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub savedata(); } }); } protected void savedata() { // TODO Auto-generated method stub try { File sdcard = Environment.getExternalStorageDirectory(); File directory = new File(sdcard.getAbsolutePath() + "/WIFI_RESULT"); directory.mkdirs(); name = new SimpleDateFormat("yyyy-MM-dd HH mm ss").format(new Date()); File file = new File(directory,name + "wifi_data.txt"); FileOutputStream fou = new FileOutputStream(file); OutputStreamWriter osw = new OutputStreamWriter(fou); try { for (int i =0; i < list.getCount(); i++){ osw.append(list.getItemAtPosition(i).toString()); } osw.flush(); osw.close(); Toast.makeText(getBaseContext(), "Saved", Toast.LENGTH_LONG).show(); } catch (IOException e){ e.printStackTrace(); } } catch (FileNotFoundException e){ e.printStackTrace(); } } class WifiScanReceiver extends BroadcastReceiver { @SuppressLint("UseValueOf") public void onReceive(Context c, Intent intent) { int a =0; wifi.startScan(); List<ScanResult> wifilist = wifi.getScanResults(); if (a<wifilist.size()){ a=wifilist.size(); } for(int j=0;j<wifilist.size();j++){ if(bssid[j].equals(null)){ ssid[j] = wifilist.get(j).SSID.toString(); bssid[j] = wifilist.get(j).BSSID.toString(); lvl[j] = wifilist.get(j).level; count[j]++; } else if (bssid[j].equals(wifilist.get(j).BSSID.toString())){ lvl[j] = lvl[j] + wifilist.get(j).level; count[j]++; } } wifis = new String[a]; for (int i =0; i<a; i++){ wifis[i] = ("\n" + ssid[i] + "\n AP Address" + bssid[i] + "\n Signal Strength:" + lvl[i]/count[i]).toString(); } list.setAdapter(new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,wifis)); } } protected void onDestroy() { unregisterReceiver(wifireciever); super.onPause(); } protected void onResume() { registerReceiver(wifireciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); super.onResume(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } NullPointerException at that point mean my array bssid isn't initialize. So I just want to know how to initialize it in main activity so that I can use that string bssid anywhere.

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• LINQ - group specific types of classes

  - by Nelson

  This question is similar to http://stackoverflow.com/questions/2835192/linq-group-one-type-of-item but handled in a more generic way. I have a List that has various derived classes. I may have something like this: List<BaseClass> list = new List<BaseClass>() { new Class1(1), new Class2(1), new Class1(2), new Class3(1), new Class2(2), new Class4(1), new Class3(2) }; I am trying to use LINQ to semi-sort the list so that the natural order is maintained EXCEPT for certain classes which have base.GroupThisType == true. All classes with GroupThisType should be grouped together at the place that the first class of the same type occurs. Here is what the output should be like: List<BaseClass> list = new List<BaseClass>() { new Class1(1), new Class1(2), new Class2(1), new Class3(1), new Class3(2) new Class2(2), new Class4(1), };

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• Jquery: change event not triggered in IE

  - by Kenneth

  Hi, I have some code updating a dropdownlist, and then I fire the "change" event manually. It works like it should in firefox, opera and so on, but not in Internet Explorer. Any idea why? Code attached below. $(".bringFraktvalgRadio").click(function() { var selectedValue = $(".bringFraktvalgRadio:checked").val(); $("#<%= dropDeliveryOption.ClientID %> option[value=" + selectedValue + "]").attr("selected", true); $("#<%= dropDeliveryOption.ClientID %>").trigger("change"); });

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• Prevent content with child nodes from being deleted in umbraco

  - by Soldarnal

  I would like to prevent content nodes from being trashed if they have any children. I setup an event handler like so: public class KeepSafeEvents : ApplicationBase { public KeepSafeEvents() { Document.BeforeMoveToTrash += new Document.MoveToTrashEventHandler(Document_BeforeMoveToTrash); } void Document_BeforeMoveToTrash(Document sender, umbraco.cms.businesslogic.MoveToTrashEventArgs e) { if (sender.HasChildren) { e.Cancel = true; } } } However, this doesn't seem to work. I assume it is because the delete process moves the child nodes to trash first before dealing with the parent node (which then has no children). Is there another possible solution? Or am I making a simple mistake above?

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• catching an event in VBScript

  - by be here now

  Hi, guys. This is a VBS script that opens google, fills a form, and clicks a search button. set ie = CreateObject("InternetExplorer.Application") ie.navigate("www.google.com") ie.visible = true while ie.readystate <> 4 wscript.sleep 100 WEnd set fields = ie.document.getelementsbyname("q") set buttons = ie.document.getelementsbyname("btnG") fields(0).value = "some query" buttons(0).click ie.quit Sub OnClickSub() MsgBox "button clicked!", 0 End Sub Obviously, buttons(0).click fires an onclick event of the button, which I somehow need to catch in my script, and provide it with some processing like launching OnClickSub(). Has anyone got any ideas how this should be done?

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• More than one profile in Django?

  - by JPC

  Is it possible to use Django's user authentication features with more than one profile? Currently I have a settings.py file that has this in it: AUTH_PROFILE_MODULE = 'auth.UserProfileA' and a models.py file that has this in it: from django.db import models from django.contrib.auth.models import User class UserProfileA(models.Model): company = models.CharField(max_length=30) user = models.ForeignKey(User, unique=True) that way, if a user logs in, I can easily get the profile because the User has a get_profile() method. However, I would like to add UserProfileB. From looking around a bit, it seems that the starting point is to create a superclass to use as the AUTH_PROFILE_MODULE and have both UserProfileA and UserProfileB inherit from that superclass. The problem is, I don't think the get_profile() method returns the correct profile. It would return an instance of the superclass. I come from a java background (polymorphism) so I'm not sure exactly what I should be doing. Thanks!

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• ASP.NET MVC Filters: How to set Viewdata for Dropdown based on action parameter

  - by CRice

  Hi, Im loading an entity 'Member' from its id in route data. [ListItemsForMembershipType(true)] public ActionResult Edit(Member someMember) {...} The attribute on the action loads the membership type list items for a dropdown box and sticks it in viewdata. This is fine for add forms, and search forms (it gets all active items) but I need the attribute to execute BASED ON THE VALUE someMember.MembershipTypeId, because its current value must always be present when loading the item (i.e. all active items, plus the one from the loaded record). So the question is, what is the standard pattern for this? How can my attribute accept the value or should I be loading the viewdata for the drop down in a controller supertype or during model binding or something else? It is in an attribute now because the code to set the viewdata would otherwise be duplicated in each usage in each action.

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• app_label in an abstract Django model

  - by rayan

  Hi all, I'm trying to get an abstract model working in Django and I hit a brick wall trying to set the related_name per the recommendation here: http://docs.djangoproject.com/en/dev/topics/db/models/#be-careful-with-related-name This is what my abstract model looks like: class CommonModel(models.Model): created_on = models.DateTimeField(editable=False) creared_by = models.ForeignKey(User, related_name="%(app_label)s_%(class)s_created", editable=False) updated_on = models.DateTimeField(editable=False) updated_by = models.ForeignKey(User, related_name="%(app_label)s_%(class)s_updated", editable=False) def save(self): if not self.id: self.created_on = datetime.now() self.created_by = user.id self.updated_on = datetime.now() self.updated_by = user.id super(CommonModel, self).save() class Meta: abstract = True My common model is in [project_root]/models.py. It is the parent object of this model, which is located in an app called Feedback [project_root]/feedback/models.py: from django.db import models from mediasharks.models import CommonModel class Feedback(CommonModel): message = models.CharField(max_length=255) request_uri = models.CharField(max_length=255) domain = models.CharField(max_length=255) feedback_type = models.IntegerField() Basically I'm trying to set up a common model so that I'll always be able to tell when and by whom database entries were created. When I run "python manage.py validate" I get this error message: KeyError: 'app_label' Am I missing something here?

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• How to determine the port numbers for peripherals devices?

  - by smwikipedia

  I know that peripheral devices such as a hard driver, a floppy driver, etc are controlled by reading/writing certain control registers on their device controllers. I am wondering about the following questions: Is it true that when these peripheral devices are plugged onto the computer, the addresses(port numbers) of their control registers are thus determined by how they are attached to the address bus (i.e. the hard-wiring)? Who makes the scheme of the port number assignment? If I was given a naked computer(with no operating system and with many peripheral devices), how could I figure out the port number assignment so I can use them to control peripheral deveices.

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