Scrolling Game Development Kit Forum
SGDK Version 2 => Help, Errors, FAQ => Topic started by: v6v on 2010-12-27, 04:02:24 PM
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This may be odd, but can anyone tell me what the code for using WinSock in SGDK2 would look like? I would like to implement some netgame feature into my game. Even just the sourcecode for a message chat or the code for passing any kind of value from one computer to another via the Internet would work. I would like to build off on there. If anyone could make the SGDK2 Code to send data from Computers and recieve it Via the Internet (Whether it's just text or numbers or something full end like the Netgame Sample from SGDK1) That would help. Thank you. (I couldnt get the netgame thing from SGDK1 to help so Im hoping sgdk2 hes something up my alley
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See:
- Microsoft's documentation for .NET 2.0 TcpClient class (http://msdn.microsoft.com/en-us/library/1612451t(v=VS.80).aspx).
- Microsoft's documentation for .NET 2.0 TcpListener class (http://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener(v=VS.80).aspx).
Let me know how far those get you and I can investigate further from there.
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Well I started my code like this.
namespace System.Net.Sockets
{
public class TcpClient : IDisposable
It gave me errors about implementing IDisposable.
So This became my code For Hosting a Server:
using System.ComponentModel;
using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
namespace NetGames
{
class MyTcpListener
{
[Description("Host a Netgame")]
public static void Host()
{
TcpListener server=null;
try
{
Int32 port = 5096;
IPAddress localAddr = IPAddress.Parse("127.0.0.1");
server = new TcpListener(localAddr, port);
server.Start();
Byte[] bytes = new Byte[256];
String data = null;
while(true)
{
Console.Write("Waiting for a connection... ");
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Connected!");
data = null;
NetworkStream stream = client.GetStream();
int i;
while ((i = stream.Read(bytes, 0, bytes.Length))!=0)
{
data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
Console.WriteLine("Recieved:
data = data.ToUpper();
byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);
stream.Write(msg, 0, msg.Length);
Console.WriteLine("Sent; {0}", data);
}
client.Close();
}
}
catch (SocketException e)
{
Console.WriteLine("SocketException: {0}", e);
}
finally
{
server.Stop();
}
Console.WriteLine("\nHit enter to continue...");
Console.Read();
}
}
}
Mostly Derived from the Msdn, It works with no Errors in sgdk2. I call it in one of the Plans. Its a connection test. :D However it freezes when using it. Where Did I go wrong? How would the code for sending and recieving player Inputs across the internet look?
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It freezes because you have a while(true) loop that never exits. That function, the way you have written it, will be 100% focused on only reading from the network and will never return to the caller, especially if nothing on the network even tries to connect to it. Generally that kind of stuff would be done on a separate thread, I guess. I suppose I will have to work out a sample. Hopefully Friday if not before.
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Thank you so much Bluemonkmn. It really means alot to me. And thanks for the diagnosis. :D
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Attached is an SGDK2 project that networks up to 3 players by simply replacing the inputs for the players that are not the local player with an object that gets inputs from the network. Once the Net.cs file is in the project, all you have to do is have a plan that calls NetworkPlayers once per frame, and it will map the players from the network into the inputs for the players in this game. Then you map the inputs of all the players to sprites like normal and viola. Inputs from the network are controlling sprites.
I tested it for 2 and 3 players all running on a local machine, but I noticed that player 3 could see the other two players, but not actually play for some reason. I don't have time to investigate further right now, but the simplicity of this solution is pretty cool. It worked pretty well to have players be generic objects because I could just replace them with network players and you don't need to change any SGDK2 code. Although I did change one line of SGDK2 code for testing: I made it so that the game will continue to run when the window is inactive, otherwise I can't have two windows running on the same machine playing with each other. One is always inactive causing the whole game to freeze. So I commended out the line that pauses the game with the window is inactive in GameForm.cs.
Edit: Attachment updated. All 3 players now work correctly.
Edit 2: Attachment updated. I hope Net.cs is compatible with .NET 1.1 now
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Thank you bluemonkmn. This might sound like kind of a drag, but how would you make this work in sgdk 2.0? My display drivers don't support the GL_ARB texture rectangle so I'm using version 2.0, Sadly this project doesn't run in 2.0. What sinple changes to the code do I need to make it run? Importing it in the earlier version doesnt help either...
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I'd rather figure out how to make 2.1 work on your system than figure out how to get back to 2.0. DirectX must be doing something that we could do with OpenGL if we knew what to do... unless the OpenGL drivers for your card are just that much stupider than the DirectX drivers. So two things to try:
1. Check for updated drivers for your card again to see if there's anything more recent available now.
2. Try removing the GL_ARB reliance from the code... not sure how to do this yet, but if you can't find drivers that work, we can investigate this. Do you have and OpenGL utility that shows what all the openGL features your card *does* support. There must be one available somewhere. I want SGDK2.1 to work on as wide a variety of systems as possible. So with your help I hope we can figure out what needs to be done to make it work as well as it does with DirectX. Maybe the only choice is to make sure the graphic sheet is a power of 2 pixels in size, and then avoid using GL_ARB. I thought GL_ARB was to allow arbitrary texture sizes, but I'm not so sure any more. Perhaps we should just remove the requirement and see what happens. What happens if you ignore the warning message (it doesn't force you to quit does it? is still tried to function?). (Note: http://www.opengl.org/wiki/NPOT_Texture (http://www.opengl.org/wiki/NPOT_Texture), http://www.opengl.org/registry/specs/ARB/texture_rectangle.txt (http://www.opengl.org/registry/specs/ARB/texture_rectangle.txt))
Ooh, also, it's theoretically possible to use DirectX in SGDK 2.1... that might be another option to look into.
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The error I get in the NetSample is :
The GL_ARB Texture Rectangle that happens in the Map editor usually,
Ive tried this on two computers.
X60 Lenovo Thinkpad, Windows 7, the utility I used "OpenGL Extensions Viewer 3.0" Says all the drivers are up to date and passes all GL tests up to OpenGL 1.4
Compaq Prescario.. something. I just bricked it accidentally yesterday and have yet to use Windows Recovery... This was my old Computer for running SGDK1 and SGDK2
It had a VIA/S3G Unichrome IGP Display driver Up to date, and supported OpenGL...
Both Ran 2.0 flawlessly, but give the same errors on 2.1
It gives me the option to Continue or Quit the application, but continuing just leaves me with... Well... Imagine the Ugly Hall of Mirrors Effect that occurs when a Map has no background..
I cant see any sprites, No music is run. Just a glitched Application window or a Glitched Map editor.
After 2 weeks of trying to get 2.1 to work, I just went back to 2.0. If theres any way for me to edit the code to remove the error, that would help, I don't want to "break" anything else I thnk my PC is already breaking.
The portability of my game on a large amounts of computers running Windows, (I find my potential players run Windows Based OS's) is essential, as this will be a Mainly Online Based Game, Sort of like an MMORPG. Even If I fix this problem for me, Having to get 20 or so more people (At least I hope so for the release :P) to have to do similar processes may discourage people from playing. I could include a Support HTML file... but I dont know if the solution to this would be a simple 10 step process, more of a guess and check solution.
I find many of my players can run the DirectX projects, rather the OpenGL.
The only computer Ive been able to get 2.1 to run on is my Technical School Teachers Computer. He has high end graphics cards that the school decided to splurge on, and it is a CAD class...
He uses Nvidia I think...
I'm going to try to play with things -_- But I doubt it'll work after my past 2 weeks.
I would love to help you run 2.1 on a vast amount of computers.
*I forgot* The error I get runing the Net.cs in 2.0 was:
error CS0116: A namespace does not directly contain members such as fields or methods Line 119, character 4
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It may be a few days before I have time to investigate DirectX again. But I do hope to look into that.
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*I forgot* The error I get runing the Net.cs in 2.0 was:
error CS0116: A namespace does not directly contain members such as fields or methods Line 119, character 4
Try removing the word "static" from line 119 (Ctrl-G to go to line 119). It's the line that says "static class Net".
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d:\C#\Sewnwerars\Game\fmodbase.cs(89,10) : warning CS0168: The variable 'ex' is declared but never used
d:\C#\Sewnwerars\Game\Snow.cs(169,18) : warning CS0168: The variable 'ex' is declared but never used
d:\C#\Sewnwerars\Game\Net.cs(33,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
d:\C#\Sewnwerars\Game\Net.cs(39,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
d:\C#\Sewnwerars\Game\Net.cs(52,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
d:\C#\Sewnwerars\Game\Net.cs(63,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
d:\C#\Sewnwerars\Game\Net.cs(75,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
d:\C#\Sewnwerars\Game\Net.cs(196,13) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
d:\C#\Sewnwerars\Game\Net.cs(245,23) : error CS0117: 'string' does not contain a definition for 'IsNullOrEmpty'
d:\C#\Sewnwerars\Game\Net.cs(305,10) : error CS0117: 'System.Windows.Forms.Button' does not contain a definition for 'UseVisualStyleBackColor'
d:\C#\Sewnwerars\Game\Net.cs(329,10) : error CS0117: 'CustomObjects.NetParams' does not contain a definition for 'AutoScaleDimensions'
d:\C#\Sewnwerars\Game\Net.cs(330,10) : error CS0117: 'CustomObjects.NetParams' does not contain a definition for 'AutoScaleMode'
(The Errors I get when it runs) ↑ ^^^
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.3.cs(89,10) : warning CS0168: The variable 'ex' is declared but never used
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.30.cs(169,18) : warning CS0168: The variable 'ex' is declared but never used
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(33,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(39,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(52,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(63,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(75,10) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(196,13) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(245,23) : error CS0117: 'string' does not contain a definition for 'IsNullOrEmpty'
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(305,10) : error CS0117: 'System.Windows.Forms.Button' does not contain a definition for 'UseVisualStyleBackColor'
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(329,10) : error CS0117: 'CustomObjects.NetParams' does not contain a definition for 'AutoScaleDimensions'
c:\Users\David Thomas\AppData\Local\Temp\ampxscrj.33.cs(330,10) : error CS0117: 'CustomObjects.NetParams' does not contain a definition for 'AutoScaleMode'
The errors I get when trying to look at the rule list ^^^ ↑
Seems that removing 'static' presents more errors...
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I think you're getting these errors because SGDK 2.1 was upgraded to use .NET 2.0, but SGDK 2.0 and you are still back on .NET 1.1. I updated the attachment above with a version of Net.cs that takes care of all the errors you listed. Hopefully that's all of them. Here are the changes I made:
1. Add a declaration for "NetworkStream stream;" after "TcpClient client;".
2. Add "stream = client.GetStream();" after "this.client = client;".
3. Change client.Client.Receive calls to stream.Read:
a. Change the one in ReceivePlayerInputs to "stream.Read(inputBuffer, 0, inputBuffer.Length);"
b. Change the one in ReadOtherPlayerInputs to "stream.Read(playerInputBuffer, 0, playerInputBuffer.Length);".
c.
4. Change client.Client.Send calls stream.Write:
a. Change the one in SendPlayerInputs to "stream.Write(playerInputBuffer, 0, playerInputBuffer.Length);".
b. Change the one in SendMyInputs to "stream.Write(inputBuffer, 0, inputBuffer.Length);".
c. Change the one in SendPlayerNumber to "stream.Write(playerInputBuffer, 0, playerInputBuffer.Length);".
5. Change the line that contained IsNullOrEmpty to "if ((frmNp.HostName == null) || (frmNp.HostName.Length == 0))"
6. Delete the other lines that were referenced:
a. Delete the line containing "UseVisualStyleBackColor"
b. Delete the line containing "AutoScaleDimensions"
c. Delete the line containing "AutoScaleMode".
I think that was everything.
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If I knew more about C# I would love to stop bothering you.. and because of every post and attachment you've made for the sake of my game I thank you. You have done a lot for me. Thank you very much for devoting time out of your day for me, bluemonkmn.
I still get 2 errors.
c:\Users\David Thomas\AppData\Local\Temp\1woygti1.3.cs(89,10) : warning CS0168: The variable 'ex' is declared but never used
c:\Users\David Thomas\AppData\Local\Temp\1woygti1.27.cs(198,13) : error CS0122: 'System.Net.Sockets.TcpClient.Client' is inaccessible due to its protection level
You sir, are a genius. Creating with ease code that would take me months, in only a day or two.
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Go to line 198 (with Ctrl-G and type 198) and replace these lines:
byte[] playerInfo = new byte[5];
connector.Client.Receive(playerInfo);
with this:
byte[] playerInfo = client.ReadOtherPlayerInputs();
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Works like a charm! Thanks! Do I need to forward my ports to a certain port to host?
http://i55.tinypic.com/2wq7a6c.png
One of my clients sent me a picture with this error.
I changed the port in the code to 2976, and forwarded my Computers ports to 2976.
Does SGDK2 Lock ports? Because when I host and use a Port Checker to see if its open, It says port 2976 is wide open on both TCP and UDP.
Forwarding my ports did help however, Because connecting to anyone without Forwarded Ports or a Firewall gives me a message saying the host ABSOLUTELY REFUSED connection
Seems like a Firewall issue? My firewall is set to allow my Executable to run
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Well, SGDK2 itself doesn't do anything with port numbers, of course, but the Net.cs class does. And it is just using the most straightforward socket access I could find. Under the covers, however, it might be doing something more complicated. Generally when you have a TCP listener on a particular port, it hears a connection request and then communicates another port number that can be used for that TCP channel so that it can continue to listen for other connections on that port. I'm not sure if that's what's happening here, but if so, it's possible that your port for listening is routed properly, but the port that the listener assigned for the actual TCP channel after connected was not.
It looks like some details are described here: http://stackoverflow.com/questions/1415682/tcplistener-accepttcpclient-and-firewall (http://stackoverflow.com/questions/1415682/tcplistener-accepttcpclient-and-firewall). And others here: http://bytes.com/topic/c-sharp/answers/544315-tcplistener-tcpclient-not-working-over-nat (http://bytes.com/topic/c-sharp/answers/544315-tcplistener-tcpclient-not-working-over-nat)
It's all pure .NET framework so I don't have much more info about it that than you. Networking can get complicated. There's the router and the computer to deal with and there are NAT and Firewall rules to deal with too. And there's probably more. You might want to try some simpler networking programs or diagnostic tools to see if they help identify what kind of connections are possible between a particular pair of computers rather than trying to figure it out via running the game directly.
Edit: Maybe you need to enable the AllowNatTraversal property on the TcpListener before it starts listening: http://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener.allownattraversal.aspx (http://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener.allownattraversal.aspx). ???
Edit 2: One more thing. The client should not be including a port number, only an IP address in the server name field (when the user types an address in). I don't know if that's an issue or not. But the port number for both server and client is set by the code and should not be included in the address.
Edit 3: Unfortunately AllowNatTraversal is not available on .NET 1.1... it's not available until .NET 4. Not sure what to suggest exploring first... upgrading to .NET 4 or determining the actual cause of the problem and finding an alternative or more correct solution.
Edit 4: Also see http://blogs.msdn.com/b/ncl/archive/2009/07/27/end-to-end-connectivity-with-nat-traversal-.aspx (http://blogs.msdn.com/b/ncl/archive/2009/07/27/end-to-end-connectivity-with-nat-traversal-.aspx)
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Thanks for the info :(. This may be an odd question, but could a program like Hamachi allow connectivity?
Unrelated: I was also going to modify the net.cs to send chatroom messages between the host and the client server, like an IRC in game. :D Which would be the wisest way of showing the text, the Message code? Or a Message Box simular to the net.cs ip prompt? Its windowed.
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I haven't heard of Hamachi, but it looks like something worth trying. I would find some other simple test program(s) before Hamachi, though, to see if the problem can be replicated in any other software.
I would suggest something similar to LogDebugLabel for drawing messages from players, but of course it would operate even in non-debug mode. Most of the code you need is actually in GameForm in the OutputDebugInfo. You could copy that into custom code, rename it and remove the "Conditional("DEBUG")" line so that you can use it in any mode. No time to explain in detail at the moment.
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Does this issue for the netgame even seem fixable? Or should I abandon all hope and try making a Game like this thats browserbased with JS and PHP etc...
Funny enough, a netgame works if the IP is 127.0.0.1.. On the same machine :/
But if the host window is paused the client gets kicked. :O I couldnt find the line that you said you commented out in GameForm.cs
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Does this issue for the netgame even seem fixable? Or should I abandon all hope and try making a Game like this thats browserbased with JS and PHP etc...
I can't tell yet. It could be fixable, but you need to run some other diagnostics or at least other network games on the pair of machines to see if others have made it work. If others can make it work, we should be able to make it work. Did you look at Hamachi yet? If you can't find existing software and utilities to test with, maybe you want to get C# Express (if you don't already have it; it's free) and try going through this tutorial. It would help in understanding the code better anyway:
C# Tutorial - Simple Threaded TCP Server (http://www.switchonthecode.com/tutorials/csharp-tutorial-simple-threaded-tcp-server)
You need something simpler than the game to test the connection with. I could write something if you can't find or write something.
But if the host window is paused the client gets kicked. :O I couldnt find the line that you said you commented out in GameForm.cs
I changed this line:
isActive = (System.Windows.Forms.Form.ActiveForm == this);
to this:
isActive = true; //(System.Windows.Forms.Form.ActiveForm == this);
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Did you give up on making a network game with SGDK2, or did you get it working?
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Im starting from scratch now. Learning Java and eventually going to learn C# :D Last thing I want to be is a Help Vampire
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Ive discovered the possible issue, its that the firewall refuses all external connections on the port. Happily I finally got it to work with my external Address.
I added this on line 146
host.AllowNatTraversal(true);Changed the Address for listening to my Network Address
(192.168.1.103)
Then I added a firewall exception for my EXE.
Now, the only issue is the Framerate. I have to further investigate this, but as long as It can connect, I at least have a base for what I can use for my game.
Ill have to prompt the use for their Network IP or use some other means of locating it, as well as code that Uses FirewallAPI.dll to automatically add an exception (If It can do that, but I read it in the article you sent :) )
Thanks for the code!
EDIT: Im using SGDK 2.1.9 for this, with the NET Framework 4.0 even though it might already be obvious :)
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Wow -- look at that self-sufficiency... way to go!
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My only concern now is really making code that downloads a SaveGame from the host. To do this, I figured everytime the host gets a join, It saves the current save so that joiners can download. Ive never worked with savegames. Do they save the position of the sprites and the Current Tiles of the Map (as for counters)? Can they be altered in a compiled close source game? It seems simpler than the Dynamic Map Loading thing durund was talking about. The game is simular to Minecraft/Terreria, so the Tiles in the Map Are very important, as well as the counters processing daytime/nighttime and inventories etc, so they desperately need to be sync'ed. But then again there might be difficulty downloading a save file from one PC ingame, and storing it to a file the client loads before the host syncs inputs. If I created a map called Network, upon savegame load would the Map generate the tiles from the downloaded Savegame (If the size for the map remained constant for client and host- after being defined by the game already)?
Concerns aside, My only cry for help now is challenging the possibility of said idea. Does it even seem possible? Am I making this too complicated?
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Saved game functions should be a good way to synchronize the maps except that you will somehow have to keep track of the separate players since you don't want everyone's map to be *exactly* the same. You want player 2 to be controlling a different sprite than player 1. But yes, all the tiles and sprites are saved if you don't explicitly exclude/include a limited subset of info in the save unit with IncludeInSaveUnit.
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Speaking of 2D games like minecraft, have you heard of 2dcraft (http://2dcraft.net/)? I just answered a question for it on stackoverflow.com (http://stackoverflow.com/questions/6109490/cell-based-liquid-simulation-local-pressure-model/6194949#comment-7224264) and it looks like an interesting game. But I haven't investigated much yet.
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Whew, thats a relief, and yes, Ive actually seen something EXACTLY like that 2Dcraft
http://www.youtube.com/watch?v=_fI68a_hGGg&feature=related
Made in GameMaker LOL. But the feel Im going for...well I cant explain it until I release an alpha of my game. Its similar in some sense but different, combining 2D elements from Terarria, Minecraft, with Crafting based on the Android Game: Alchemy. Multiplayer will be the last thing Ill add after a SinglePlayer, Coop and Sandbox Mode, but its good to plan ahead.
After all, adding multiplayer increases re-playability, an issue I have with most games Ive played or made.
Ill try to post what I have so far in the Projects category soon so you can see.