| Fullscreen Frontend for NES ITX PC's (Windows) [message #1239] |
Sat, 17 May 2008 01:42  |
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Greetings... I'm writing a public release version of the fullscreen frontend for Mednafen I wrote for my Mini-ITX in a NES shell whic is attached to my TV.
Obligatory screencap:
It is written to be completely joystick driven (the reset button on the NES box is used to drop back from the emulator.. I'm trying to figure out a way to do so w/ the joystick, as I doubt many other people have a NES ITX rigged with a keyboard controller so the reset switch sends an Escape keypress), and I am adding a configuration tool so that people besides myself can customize their joystick mapping.
Here's my problem: in order to write the settings to the mednafen config file, I need to know how it derives the joystick's unique identifier. I'm using C# with managed Direct X, and can only pull a 16-byte GUID from the device listing, which does not match the 16-character hex string in the config file, no matter how I parse it out.
Does anyone know how I can pull the same identifier?
Oh, and if you're curious, yes, those are completely interactive graphics... god bless layered imaging in GDI+ =)
[Updated on: Sat, 17 May 2008 02:05]
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| Re: Fullscreen Frontend for NES ITX PC's (Windows) [message #1240 is a reply to message #1239 ] |
Sat, 17 May 2008 08:22  |
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uint64 GetJoystickUniqueID(SDL_Joystick *joystick)
{
uint8 digest[16];
int tohash[4];
md5_context hashie;
uint64 ret = 0;
int x;
tohash[0] = SDL_JoystickNumAxes(joystick);
tohash[1] = SDL_JoystickNumBalls(joystick);
tohash[2] = SDL_JoystickNumHats(joystick);
tohash[3] = SDL_JoystickNumButtons(joystick);
hashie.starts();
hashie.update((uint8 *)tohash, sizeof(tohash));
hashie.finish(digest);
for(x=0;x<16;x++)
{
ret ^= (uint64)digest[x] << ((x & 7) * 8);
}
return(ret);
}
and
Joysticks[n] = SDL_JoystickOpen(n);
if(Joysticks[n])
{
UniqueID[n] = GetJoystickUniqueID(Joysticks[n]);
int plusplus = 0;
for(int x = 0; x < n; x++)
{
if(UniqueID[x] == UniqueID[n])
plusplus++;
}
UniqueID[n] += plusplus; // Work around hash collisions
MDFN_printf(_("Joystick %d - %s - Unique ID: %016llx\n"), n, SDL_JoystickName(n), UniqueID[n]);
}
The hashing code is obviously going to have a lot of collisions compared to a Windows GUID...
I think SDL uses WinMM joystick functions, so it may not always match up exactly with what DirectX reports, unfortunately.
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| Re: Fullscreen Frontend for NES ITX PC's (Windows) [message #1241 is a reply to message #1240 ] |
Sat, 17 May 2008 11:56 |
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Ah, thank you! Actually, I've got SDL.NET, which returns precisely the values that this function is looking for, so that should work.
I just hate to have that SDL lib loaded right next to my nice, sleek little DX input wrapper. I may need to go back and rewrite all of it to work straight from SDL.NET altogether, and leave DX out of the mix.
Thanks for the code, I don't know how long it would have taken me to sift through the source on this... I've not touched C++ in a few years, and can't speed read it as well as I once could. =)
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| Re: Fullscreen Frontend for NES ITX PC's (Windows) [message #1242 is a reply to message #1239 ] |
Sat, 17 May 2008 15:38 |
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Wow... I'm having no luck recreating that MD5 generator in C#. I think I may try to compile just that portion of the program (md5_context) as a standalone executable which takes four arguments, and returns the hash to stdout. My frontend can call it and capture the results.
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| Re: Fullscreen Frontend for NES ITX PC's (Windows) [message #1255 is a reply to message #1242 ] |
Fri, 30 May 2008 01:10 |
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For calculating a MD5 sum for a file from c#:
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
class test
{
static int Main ()
{
StringBuilder sb = new StringBuilder();
FileStream fs = new FileStream("some_blah_file.txt", FileMode.Open);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] hash = md5.ComputeHash(fs);
fs.Close();
foreach (byte hex in hash)
sb.Append(hex.ToString("x2"));
Console.WriteLine(sb.ToString());
return 0;
}
}
[Updated on: Fri, 30 May 2008 03:30]
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| Re: Fullscreen Frontend for NES ITX PC's (Windows) [message #1257 is a reply to message #1255 ] |
Fri, 30 May 2008 20:07 |
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Oh, sorry...you were trying to get an md5 from the joystick hash string from SDL I think? I didn't read the thread before I answered...for that you use the same method, you just use the byte version:
. . .
string jshash = "ce96ea6b9d7ca56a";
StringBuilder sb = new StringBuilder();
MD5 md5 = new MD5CryptoServiceProvider();
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] hash = md5.ComputeHash(encoding.GetBytes(jshash));
foreach (byte hex in hash)
sb.Append(hex.ToString("x2"));
. . . |
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