Re: [C#] Diffirent between thread and timer - C# Discussion Boards

Re: [C#] Diffirent between thread and timer

7-Jun-20 20:23

You can't compare threads and timers: that's like comparing electricity to an orange.

A thread is a separately executing "chunk" of code with its own stack which operates independently within a process but which shares common memory with other threads in the process.

A timer is a (fairly) regular event which happens within a thread at an interval.

You need to look at your code - both thread and timer - to work out why your threaded version doesn't work. We can't do that as we have no access to your code other than exactly what you show us - and your code fragment is useless out of context. Do remember that threads cannot access any Controls directly: trying will get you a cross threading exception. Timers don;t have this problem as they run within the thread that created the Timer object.

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Eddy Vluggen8-Jun-20 1:25

Eddy Vluggen

8-Jun-20 1:25

You can't access/use controls/variables from different threads. Your normal application is the main-thread, and within it, you can access all that you create there. The timer interrupts execution of that mainthread to execute the timed code with that thread.

If you create a new thread, then this will run seperately from the mainthread, without interrupting it. That's the preferred way, but you'd need to read up on how to synchronize your data with the mainthread.

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Need help calling a static method

Member 148563427-Jun-20 15:00

Member 14856342

7-Jun-20 15:00

Hello, I'm currently making a program that will take a HEX string and convert it into an image.

I talked to a experienced coder and he gave me some steps to my problem:
1) Create a simple hello world program with a main method
2) Make it so your program can print out the byte array you input to the console
3) Figure out how to link in the libraries the code you posted references (looks like SkiaSharp and PakReader)
4) Make the call to the code you showed (TextureDecoder.DecodeImage)
5) Write the resulting SKImage to a file

I'm trying to call a method from a separate program. I'm really inexperienced and confused even after looking at documentation and multiple YT videos.

I had a couple of questions about how I should do this:

I'm trying to call

TextureDecoder.DecodeImage

from the program in the link below.
hastebin[^]

MY current code so far, based off of the first 3 Steps a guy gave me for help:

using System;
using System.IO;
using PakReader.Parsers.Objects;
using SkiaSharp;


namespace EncyptedViewing
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("HEX Input");
        }
    }
}

I would like to know how I would call the class from the link above TextureDecoder.DecodeImage into the program above, or is that not possible and I need to do it all in one program?

Thanks, and stay safe.

Re: Need help calling a static method

OriginalGriff7-Jun-20 20:29

Card shuffle program code help needed

7-Jun-20 20:29

Try

SKImage ski = PakReader.TextureDecoder.DecodeImage(sequence, width, height, depth, format);

You'll have to work out what the parameter values contain for yourself: we have no idea what you are trying to do with it.

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Brian_TheLion7-Jun-20 3:57

7-Jun-20 3:57

I entered code from a YouTube video into Microsofts version 8 compiler but can't get the cards to display. The code is written in 2017 for an older compiler.
In the code it has
Public override string ToString()
{
Return face + " of " + suit;
}
Would this code apply to the latest microsoft compiler?
The only code for printing the cards is
Console.write( deck1.DealCard());
Which is looped.
The problem is finding out why the cards are not displayed.
If needed I could give you the whole code but I can't remember how you format the code in this forum.
Cards should be printed as 4 of hearts etc.

Brian

Dave Kreskowiak7-Jun-20 4:03

Dave Kreskowiak

7-Jun-20 4:03

The code applies to any version of C#. There's really nothing to it. All it's doing is returning a string with the value of face and suit converted to strings.

Those two variables have to be supplied by other code in your class.

There's no way to tell you what you're doing wrong since we can't see the code for the type deck1 is, nor can we see the code for what, I assume, your card class is.

You're going to have to hit the "Improve question" button to add the relevant code to your question.

Also, stay away from YouTube videos for learning to code. I haven't seen a good one yet.

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OriginalGriff7-Jun-20 4:14

7-Jun-20 4:14

Dave Kreskowiak wrote:
stay away from YouTube videos for learning to code. I haven't seen a good one yet.

I suspect that most of 'em are created by people who
1) Have no idea how to make a good video
And
2) Have no idea how to code.

They have code that works, but they have no idea why it does - so they blindly type it in and then show "working" results - that most times are unrelated to the code they actually typed.

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Dave Kreskowiak7-Jun-20 8:05

Dave Kreskowiak

7-Jun-20 8:05

Yeah.

Every video I've seen doesn't go into anywhere enough detail as to why they are doing the things they are. I suspect this is because of just what you said. They have no idea what they're doing.

Just showing what may even be simplified code from a more complex topic is done without sufficient explanation.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Brian_TheLion8-Jun-20 19:17

Re: Card shuffle program code help needed (code included)

8-Jun-20 19:17

Hi Griff.

Can you suggest somewhere that I might be able to find C# code listing for a card shuffing program or any card program.

Brian

Brian_TheLion7-Jun-20 15:27

Re: Card shuffle program code help needed (code included)

7-Jun-20 15:27

<pre lang="c#">
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Card_Shuffle
{
public class Deck
{
private Card[] deck;
private int currentCard;
private const int NUMBER_OF_CARDS = 52;
private Random ranNum;

public Deck()
{
string[] faces = { "Ace", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nin", "Ten", "Jack", "Queen", "King" };
string[] suits = { "Hearts", "Clubs", "Diamonds", "Spades" };
deck = new Card[NUMBER_OF_CARDS];
currentCard = 0;
ranNum = new Random();
for (int count = 0; count < deck.Length; count++)
deck[count] = new Card(faces[count % 11],
suits[count / 13]);
}

public void Shuffle()
{
currentCard = 0;
for (int first = 0; first < deck.Length; first++)
{
int second = ranNum.Next(NUMBER_OF_CARDS);
Card temp = deck[first];
deck[first] = deck[second];
deck[second] = temp;
}
}
public Card DealCard()
{
if (currentCard < deck.Length)
return deck[currentCard++];
else return null;
}

public class Card
{
private string face;
private string suit;
public Card(string cardFace, string cardSuit)
{
face = cardFace;
suit = cardSuit;
}
public override string ToString()
{
return face + " of " + suit;
}

}

static void Main(string[] args)
{
Deck deck1 = new Deck();
deck1.Shuffle();
for (int i = 0; i < 52; i++)
{
Console.Write("0-19)", deck1.DealCard());

if ((i + 1) % 4 == 0)

Console.WriteLine();
}
Console.ReadLine();
}

}
}

</pre>

At the moment I get 13 rows of the below text displayed.
0-19)0-19)0-19)0-19)

Brian

Richard MacCutchan7-Jun-20 21:51

Richard MacCutchan

7-Jun-20 21:51

Brian_TheLion wrote:
At the moment I get 13 rows of the below text displayed.

Quite right because that is what your code is doing. Look at the line:

Console.Write("0-19)", deck1.DealCard());

It says print the string "0-19)"; the second part deck1.DealCard() returns a string but does nothing with it. The rest of the code does very little of any use.

As already suggested you should stop wasting your time on YouTube and get hold of a decent book on C#.

Re: Card shuffle program code help needed (code included)

Brian_TheLion8-Jun-20 19:15

Re: Card shuffle program code help needed (code included)

8-Jun-20 19:15

Hi Richard.

Do you think there is some code missing?
If this is the case then I may have to give up on getting this code to work unless you could suggest some extra code I could add to the existing code.

Brian

Richard MacCutchan8-Jun-20 21:30

Richard MacCutchan

8-Jun-20 21:30

Quite frankly I don't think it's the best design of a card class that I have seen. Also, nearly all the code we see here that is taken code from a Youtube video, turns out to be not very well written. Youtubers tend not to be particularly skilled coders. If you want to learn C# properly then get hold of a decent book on the subject, it will be time and money far better spent.

Re: Card shuffle program code help needed (code included)

Richard Deeming8-Jun-20 0:08

Richard Deeming

8-Jun-20 0:08

Brian_TheLion wrote:
C#
Console.Write("0-19)", deck1.DealCard());

I suspect that should be:

Console.Write("{0,-19}", deck1.DealCard());

Composite formatting | Microsoft Docs[^]

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Re: Card shuffle program code help needed (code included)

Brian_TheLion8-Jun-20 19:01

Re: Card shuffle program code help needed (code included)

8-Jun-20 19:01

Hi Richard.

Thanks fro the suggestion.

I did as you suggested by got an error of "Input string was not in correct format".

Brian

Richard Deeming8-Jun-20 22:16

Richard Deeming

8-Jun-20 22:16

With that change, the code you've shown works fine for me.
Card shuffle | C# Online Compiler | .NET Fiddle[^]

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Re: Card shuffle program code help needed (code included)

Brian_TheLion11-Jun-20 18:20

11-Jun-20 18:20

You were correct Richard.
When I tried the format code you offered I had left the comma out of the code and got an error
I tried
Console.Write("{0-19}", deck1.DealCard());

instead of

Console.Write("{0,-19}", deck1.DealCard());

All is working find now thanks.

Brian

OriginalGriff7-Jun-20 4:11

7-Jun-20 4:11

Firstly, Return is not a C# keyword: it's case sensitive, remember - so it's return instead.

Secondly, what

return face + " of " + suit;

returns depends on the type of face and suit - if they are both strings, it'll work. If face is an integer, it'll work. If it's a special class, then it'll only work if you have overridden ToString in that class.

But basically, we can't directly help you - we can't run your code in isolation and get the same results you do.
So, it's going to be up to you.
Fortunately, you have a tool available to you which will help you find out what is going on: the debugger. If you don't know how to use it then a quick Google for "Visual Studio debugger" should give you the info you need.

Put a breakpoint on the first line in the function, and run your code through the debugger. Then look at your code, and at your data and work out what should happen manually. Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track (or run it again and look more closely) to find out why.

Sorry, but we can't do that for you - time for you to learn a new (and very, very useful) skill: debugging!

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Brian_TheLion7-Jun-20 15:37