MainForm.cs:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Text;
using System.Windows.Forms;
namespace JuicyLauncher
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
try
{
//读取版本
listBox1.Items.Clear();
String[] vers = Directory.GetDirectories(Application.StartupPath + "\\.minecraft\\versions");
foreach (String item0 in vers)
{
listBox1.Items.Add(item0.Replace(Application.StartupPath + "\\.minecraft\\versions\\",""));
}
}
catch (Exception)
{
throw;
}
}
private void button2_Click(object sender, EventArgs e)
{
Settings s = new Settings();
s.LoadForm();
s.Show();
}
private void button1_Click(object sender, EventArgs e)
{
//启动
String[] TCfg=new String[3];
TCfg=System.IO.File.ReadAllLines(Application.StartupPath + "\\JLConfig.JLConfig");//读取配置
Launcher launcher = new Launcher();
if (listBox1.SelectedIndex == -1)
{
listBox1.SelectedIndex = 0;
}
launcher.Launch(TCfg[0], TCfg[1], TCfg[2], listBox1.SelectedItem.ToString());
}
}
}

Settings.cs:
using System;
using System.Drawing;
using System.IO;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
namespace JuicyLauncher
{
public partial class Settings : Form
{
public Settings()
{
InitializeComponent();
}
public void LoadForm()
{
//读取配置
if (!File.Exists(Application.StartupPath + "\\JLConfig.JLConfig"))
{
String[] js=Registry.LocalMachine.OpenSubKey(@"SOFTWARE\JavaSoft\Java Runtime Environment").GetSubKeyNames();//读取jre路径。
StreamWriter sw=File.CreateText(Application.StartupPath + "\\JLConfig.JLConfig");
sw.Write("1024\n" + Registry.LocalMachine.OpenSubKey(@"SOFTWARE\JavaSoft\Java Runtime Environment\" + js[0]).GetValue("JavaHome") + "\\bin\\javaw.exe\nPlayer\n");
sw.Close();
}
string[] Ct = new string[] { };
Ct = System.IO.File.ReadAllLines(Application.StartupPath + "\\JLConfig.JLConfig");
mm.Text = Ct[0];
jp.Text = Ct[1];
un.Text = Ct[2];
}
private void button1_Click(object sender, EventArgs e)
{
//写配置
String[] Ct = new String[] {mm.Text,jp.Text,un.Text};//拼接配置文件内容
File.WriteAllLines(Application.StartupPath + "\\JLConfig.JLConfig", Ct);//写入
this.Close();//关闭窗体
}
private void button2_Click(object sender, EventArgs e)
{
//浏览部分
OpenFileDialog ofd = new OpenFileDialog();//初始化打开文件对话框
ofd.Title = "请选择您的javaw.exe所在路径";//设置标题
ofd.RestoreDirectory = true;//不还原路径
ofd.Multiselect = false;//不允许选择多个
ofd.Filter = "应用程序（*.exe）|*.exe";//设置格式过滤
if (ofd.ShowDialog() == DialogResult.OK)
{//显示对话框
jp.Text = ofd.FileName;//返回路径名
}
}
}
}

Launcher.cs:
using System;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Diagnostics;
namespace JuicyLauncher
{
class Launcher
{
/// <summary>
/// 启动主方法
/// </summary>
/// <param name="MaxMem">最大内存</param>
/// <param name="JavaPath">Javaw.exe路径</param>
/// <param name="UserName">用户名</param>
/// <param name="VerName">版本名</param>
public void Launch(string MaxMem,string JavaPath,string UserName,string VerName)
{
string rtxt = "";
int tmp = 0;
rtxt = File.ReadAllText(Application.StartupPath + "\\.minecraft\\versions\\" + VerName + "\\" + VerName + ".json").Replace(" ", "").Replace("\n","");//读取内容
tmp = rtxt.IndexOf("mainClass") + "mainClass".Length + 3;
String mainClass = rtxt.Substring(tmp, rtxt.IndexOf("\"", tmp) - tmp);
tmp = rtxt.IndexOf("minecraftArguments") + "minecraftArguments".Length + 3;
String minecraftArguments = rtxt.Substring(tmp, rtxt.IndexOf("\"", tmp) - tmp).Replace("${"," ${").Replace("}","} ");
tmp = rtxt.IndexOf("libraries") + "libraries".Length + 3;
String libraries = rtxt.Substring(tmp, rtxt.LastIndexOf("]") - tmp);
String[] libs = libraries.Split("},{".ToCharArray());
String libp="";
for (int i = 1; i < libs.Length; i++)
{
if (libs[i].IndexOf("name") == -1)
{
continue;
}
tmp = libs[i].IndexOf("name") + "name".Length + 3;
String libn = libs[i].Substring(tmp, libs[i].IndexOf("\"", tmp) - tmp);
if (libn.IndexOf(":") == -1)
{
continue;
}
String[] tlib = new String[] { libn.Substring(0, libn.IndexOf(":")).Replace(":", ""), libn.Substring(libn.IndexOf(":") + 1, libn.IndexOf(":", libn.IndexOf(":") + 1) - libn.IndexOf(":")).Replace(":", ""), libn.Substring(libn.IndexOf(":", libn.IndexOf(":") +1)).Replace(":", "") };
String tpath = Application.StartupPath + "\\.minecraft\\libraries\\" + tlib[0].Replace(".", "\\") + "\\" + tlib[1] + "\\" + tlib[2] + "\\" + tlib[1] + "-" + tlib[2] + ".jar";
if (File.Exists(tpath))
{
libp = libp + tpath + ";";
}
}
String natives = Application.StartupPath + "\\.minecraft\\versions\\" + VerName + "\\" + VerName + "-natives";
libp = libp + Application.StartupPath + "\\.minecraft\\versions\\" + VerName + "\\" + VerName + ".jar";
String assets=Application.StartupPath + "\\.minecraft\\assets";
String gameDir=Application.StartupPath + "\\.minecraft";
if (Application.StartupPath.IndexOf(" ") != -1)
{
natives = "\"" + natives + "\"";
libp = "\"" + libp + "\"";
assets = "\"" + assets + "\"";
gameDir = "\"" + gameDir + "\"";
}
minecraftArguments = minecraftArguments.Replace("${auth_player_name}", UserName).Replace("${version_name}", "JuicyLauncher_1.0").Replace("${game_directory}", gameDir).Replace("${game_assets}", assets);//JuicyLauncher_1.0可以改成你的启动器名字
//启动参数拼接
String RunComm = "";
RunComm = "-Xmx" + MaxMem + "m -Djava.library.path=" + natives + " -Dfml.ignoreInvalidMinecraftCertificates=true -Dfml.ignorePatchDiscrepancies=true -cp " + libp + " " + mainClass + " " + minecraftArguments;
Process mjp=new Process();
ProcessStartInfo psi=new ProcessStartInfo(JavaPath, RunComm);
psi.UseShellExecute = false;
mjp.StartInfo = psi;
mjp.Start();
Application.Exit();
}
}
}

那么，恭喜您，完成以上部分，您的启动器就基本达到了ColorLauncher和HHS-1.1启动器的水平了！它现在可以启动游戏了！
如果您觉得满意，那么您可以离开了。
接下来将是进阶部分，很难，也很无聊，成就感不强，要有足够的耐心。

点击上方绿色的小三角或按f5即可运行程序，之后便可在<项目路径>\<项目名>\bin\Debug下找到生成的exe文件。

进阶一：natives解压

我觉得从这里开始@Jayshon_Yves应该看看。

如果您完成了上述内容，您会发现有些minecraft客户端还是不能启动，这是为什么呢？

原来，这些客户端没有用hmcl启动过，没有解压natives到指定的文件夹。

于是，我们就要用代码自己解压natives库。

让我们来看看这段数据： {
"extract": {
"exclude": [
"META-INF/"
]
},
"name": "org.lwjgl.lwjgl:lwjgl-platform:2.9.0",
"natives": {
"linux": "natives-linux",
"windows": "natives-windows"
},
"rules": [
{
"action": "allow"
},
{
"action": "disallow",
"os": {
"name": "osx"
}
}
]
},

它的文件名对应<游戏路径>\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.0\lwjgl-platform-2.9.0-natives-windows.jar

可怕

C#赞个

您会发现文件路径中多出现了一个natives-windows