What do you need help with? Version 5

[MakeR]

[QUOTE=Confuzzed Otto;37032827]I know, I just forgot to put the script after java. What's the difference though?
I'm trying to learn to make small and simple 2d games as a start but first I need to learn a language (I think). Someone said javascript and I tried it, but are there any better ones to use?[/QUOTE]

To put it simply, Java is a programming language that is compiled to byte code and run on a virtual machine and Javascript is an embeddable scripting language commonly used in web browsers.

[T3hGamerDK]

I'm a bit confused about this, and I couldn't find anything on this when I searched for it, so I'm going to ask here (I hope it's not the wrong section)
For BareMetal OS .app programming, how do I copy the app files to the BareMetal node?

[Richy13]

[QUOTE=Chris220;37032858]The difference is that Java and Javascript are two entirely different languages, just like how C++ and Java are two entirely different languages. And no, I don't really know why they have such similar names.[/QUOTE]

When javascript was being created, java was the big thing and thus they called the new languagee javascript to take advantage of javas popularity

[ottr]

So wich one should I learn and how do I use to the best way/learn it in order to make an app-like game but on the computer?

[Pelf]

I'm programming a notepad but the redo function doesn't work at all.

private void redoAction()
{
    // Determines if a Redo operation can be performed.
    if (richTextBox1.CanRedo == true)
    {
        // Determines if the redo operation deletes text.
        if (richTextBox1.RedoActionName != "Delete")
        {
            // Performs the redo operation.
            richTextBox1.Redo();

            // Updates status strip on bottom of screen
            statusStripState.Text = "Action Redone";
        }
    }
}

I'm still new with programming so I copied from the msdn page [URL="http://msdn.microsoft.com/en-us/library/system.windows.forms.richtextbox.redo.aspx"]here[/URL] (except the part about updating the status strip). Each undo button calls this method when clicked to avoid having this same piece of code copied over 3 times. When I press the redo button after pressing the undo button, it does nothing, not even update the status strip state label. I tried pulling just that part (the redo and status update parts) first out of the inner if-statement and it still didn't work. Then I pulled it out of both of the if-statements and the status update will then work but it still won't redo. If it's of any importance, I copied my undo method from [URL="http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.undo.aspx"]an msdn page[/URL] aswell and that works just fine. Ctrl+z and ctrl+y work just fine too. Why won't this work?

[ShaunOfTheLive]

[QUOTE=Chris220;37032858]And no, I don't really know why they have such similar names.[/QUOTE]

Because Brendan Eich wanted them to.
[QUOTE]JS had to 'look like Java' only less so, be Java’s dumb kid brother or boy-hostage sidekick.[/QUOTE]

He even made a big stink about the name "ECMAScript" that came later; I love that name because it removes all ambiguity (except that JavaScript is technically a specific dialect of ECMAScript.)

[editline]1st August 2012[/editline]

[QUOTE=Pelf;37034827]I'm programming a notepad but the redo function doesn't work at all.

private void redoAction()
{
    // Determines if a Redo operation can be performed.
    if (richTextBox1.CanRedo == true)
    {
        // Determines if the redo operation deletes text.
        if (richTextBox1.RedoActionName != "Delete")
        {
            // Performs the redo operation.
            richTextBox1.Redo();

            // Updates status strip on bottom of screen
            statusStripState.Text = "Action Redone";
        }
    }
}

I'm still new with programming so I copied from the msdn page [URL="http://msdn.microsoft.com/en-us/library/system.windows.forms.richtextbox.redo.aspx"]here[/URL] (except the part about updating the status strip). Each undo button calls this method when clicked to avoid having this same piece of code copied over 3 times. When I press the redo button after pressing the undo button, it does nothing, not even update the status strip state label. I tried pulling just that part (the redo and status update parts) first out of the inner if-statement and it still didn't work. Then I pulled it out of both of the if-statements and the status update will then work but it still won't redo. If it's of any importance, I copied my undo method from [URL="http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.undo.aspx"]an msdn page[/URL] aswell and that works just fine. Ctrl+z and ctrl+y work just fine too. Why won't this work?[/QUOTE]

This is a stupid question, but is your text box named richTextBox1 or something else?

[esalaka]

[QUOTE=ShaunOfTheLive;37037333]He even made a big stink about the name "ECMAScript" that came later; I love that name because it removes all ambiguity (except that JavaScript is technically a specific dialect of ECMAScript.)[/QUOTE]

Is it a superset or a subset, though?

[Nikita]

Hey guys. I wanted to make a function that inserts stuff into an empty space in a map and then returns the position.

[cpp]typedef map<int, physBody*> bodymap;

int bodymap::put(physBody *val)
{
int key = 1;
while((*this)[key]!=NULL){key++;}
(*this)[key]=val;
return key;
}[/cpp]

GCC gives me an error:

specializing member 'std::map<int, physBody*>::put' requires 'template<>' syntax

I don't know anything about templates. Help?

[Hack]

Because this is kind of weird to explain, let's show you what I mean. This is in my game. When I import this base ship model, it should be at (1000,1000,1000), but the model acts like it's at (1000,1000, 0). Note it is positioned correctly when I use a .x model. So it has to be the model. I need to know what's wrong with it.

Here is the model file, tell me if anything is wrong with it: [url]https://dl.dropbox.com/u/92848165/station2.FBX[/url]

[url]http://i.imgur.com/VsjH8.jpg[/url]

EDIT: The model works if you import it into Google Sketchup...but you lose the textures, not very nice.

[Jookia]

[QUOTE=Nikita;37040082]Hey guys. I wanted to make a function that inserts stuff into an empty space in a map and then returns the position.

[cpp]typedef map<int, physBody*> bodymap;

int bodymap::put(physBody *val)
{
int key = 1;
while((*this)[key]!=NULL){key++;}
(*this)[key]=val;
return key;
}[/cpp]

GCC gives me an error:

specializing member 'std::map<int, physBody*>::put' requires 'template<>' syntax

I don't know anything about templates. Help?[/QUOTE]

You can't add members to inbuilt classes like that.

[Nikita]

[QUOTE=Jookia;37040347]You can't add members to inbuilt classes like that.[/QUOTE]

I can't? :(

What kind of storage should I use instead? What I need is:

- dynamically expand for more elements
- random access and if I get a pointer to an element, that pointer stays valid forever.
- some way to do "for each", or at least for(int i = 0; i<size;i++)
- a way to insert an element and get a pointer to it inside the storage.

Maybe I should abandon dynamic expansion and just use ordinary arrays. Like ' PhysBody *AllPhysBodies[2000] ', and then write an "insert" function myself.

[Jookia]

[QUOTE=Nikita;37040430]I can't? :([/QUOTE]

No.

[QUOTE=Nikita;37040430]What kind of storage should I use instead? What I need is:

- dynamically expand for more elements
- random access and if I get a pointer to an element, that pointer stays valid forever.
- some way to do "for each", or at least for(int i = 0; i<size;i++)
- a way to insert an element and get a pointer to it inside the storage.

Maybe I should abandon dynamic expansion and just use ordinary arrays. Like *physBody[2000], and then write an "insert" function myself.[/QUOTE]

std::vector.

[Nikita]

When I erase an element from a vector, the pointers to any element inside the vector break, and the indices are no longer valid.

[Lord Ned]

[QUOTE=Nikita;37040604]When I erase an element from a vector, the pointers to any element inside the vector break, and the indices are no longer valid.[/QUOTE]

You store pointers to your objects as the vector's members. These will never 'break'. You don't want anything to reference the memory location of the vector's member (which is a pointer to a pointer), instead you want to use the actual memory location of the member.

eg; physBoxy *pMember = myVector[i]; //pMember will be valid assuming you haven't deleted it previously.

[Nikita]

Oh. Right. I'm making it way more complex than it needs to be. I'll use a vector then.

[KGS]

Does anybody happen to know how to add a program to the windows installed software list? I wan't to be able to delete/uninstall my program through that list.

[Z_guy]

[QUOTE=0lenny0;37041008]Does anybody happen to know how to add a program to the windows installed software list? I wan't to be able to delete/uninstall my program through that list.[/QUOTE]

Well, it's stored in the registry at "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall". I guess you could look at how other programs are stored there and do the same for yours.

[Wyzard]

But if you're making an installer, don't edit the registry directly. I'm pretty the Windows Installer framework supports creating those entries automatically based on declarations in your .msi file.

[Nikita]

Another question: If I have multiple pointers to some object, and I delete the object, there will be lots of dangling pointers.

Is there a way to set all those pointers to 0 when that happens?

[stringy]

[QUOTE=Nikita;37044074]Another question: If I have multiple pointers to some object, and I delete the object, there will be lots of dangling pointers.

Is there a way to set all those pointers to 0 when that happens?[/QUOTE]

Have the object itself book-keep all pointers to it, and then set those pointers to 0 in its destructor? ( There are probably much better/orthodox/obvious ways to do this, I'm still pretty new here )

[Wyzard]

Not with plain pointers, but [url=http://en.cppreference.com/w/cpp/memory/weak_ptr]std::weak_ptr[/url] does basically what you want. You make some shared_ptrs and some weak_ptrs that all point to an object, and the object will continue to exist as long as there are any shared_ptrs to it. When all the shared_ptrs are gone, the object is destroyed and the weak_ptrs are marked as expired so your code can see that they're no longer valid.

[editline]1st August 2012[/editline]

Of course, you could write your own smart-pointer class, but it's easier and safer to use the standard one.

[Jookia]

Don't forget faster. Those compiler writers are pretty clever.

[ShaunOfTheLive]

[QUOTE=esalaka;37038423]Is it a superset or a subset, though?[/QUOTE]

It's a superset. JavaScript (which is officially only implemented by Mozilla, being owned by Brendan Eich) supports a few extra things over ECMAScript, like [URL="https://developer.mozilla.org/en/JavaScript/Reference/Statements/let"]let[/URL].

(Interestingly, Google calls V8 a "JavaScript" engine on their main V8 page, probably for convenience, but then [URL="http://code.google.com/p/v8/issues/detail?id=890&can=1&q=Javascript%201.8&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary%20HW%20OS%20Area%20Stars"]a bug comment[/URL] confirms that V8 is actually not an implementation of JavaScript, but ECMAScript.)

[Nikita]

Forgive me, C++ gods, for I have sinned.

I made my own version of smart pointers: a class that keeps track of all ordinary pointers that point to <instance of any class> and automatically sets them all to zero if they still point to it when the instance gets deleted.

I only did it because I was too lazy to switch between weak and shared pointers...

[Pelf]

My notepad program has a settings screen. On the bottom of the main screen there is a status bar which says things like "File Opened" when you open a file and similar things for other actions. I want to make it say "Settings Saved" when the user presses the save button on the settings form but I can't figure out how to do it.

[t]https://dl.dropbox.com/u/13781308/NotepadError.png[/t]

Code for the settings window:

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 NotepadSharp.Properties;

namespace NotepadSharp
{
    public partial class SettingsForm : Form
    {
        public SettingsForm()
        {
            InitializeComponent();
        }

        private void buttonSave_Click(object sender, EventArgs e)
        {
            Settings.Default.Save();
            NotepadForm.statusStripState.Text = "Settings Saved";
            this.Close();
        }
    }
}

This is probably a stupid question but I have no idea what to do.

[Jookia]

[QUOTE=Nikita;37045871]Forgive me, C++ gods, for I have sinned.

I made my own version of smart pointers: a class that keeps track of all ordinary pointers that point to <instance of any class> and automatically sets them all to zero if they still point to it when the instance gets deleted.

I only did it because I was too lazy to switch between weak and shared pointers...[/QUOTE]

Yeah, stop.

[ShaunOfTheLive]

[QUOTE=Nikita;37045871]Forgive me, C++ gods, for I have sinned.

I made my own version of smart pointers: a class that keeps track of all ordinary pointers that point to <instance of any class> and automatically sets them all to zero if they still point to it when the instance gets deleted.

I only did it because I was too lazy to switch between weak and shared pointers...[/QUOTE]

To zero, you say? Tsk, tsk, tsk.

[Snickerdoodle]

Pretty easy question here:

What compilers/interpreters do you guys recommend for beginners to C++? I'm trying to start with the basic "Hello World!" stuff and I have no console to look at that's being written to.

[ArgvCompany]

[QUOTE=Corey_Faure;37052268]Pretty easy question here:

What compilers/interpreters do you guys recommend for beginners to C++? I'm trying to start with the basic "Hello World!" stuff and I have no console to look at that's being written to.[/QUOTE]

Microsoft Visual C++ Express for Windows, GCC for everything else.

[esalaka]

[QUOTE=ArgvCompany;37052297]Microsoft Visual C++ Express for Windows, GCC for everything else.[/QUOTE]

This pretty much. Alternatively, clang on other systems, it has more understandable error messages, I believe, at least.