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PCL2一键bat解除下载限制

14
  • Coeeshu
    Coeeshu5天前
    5421
    @echo off
rem ==========================================================================
rem  PCL download-limit unlocker (patches Plain Craft Launcher 2.exe in place)
rem
rem  What it does:
rem    The launcher hides Minecraft downloads behind the compile-time constant
rem    "RestrictMcDownload". This script rewrites the tiny IL method
rem    PCL.PageDownloadInstall::LoaderInit so the download page uses the real
rem    version-list loader (PCL.ModDownload::DlClientListLoader) instead of the
rem    "download disabled" loader that always throws.
rem
rem  How to use:
rem    Put this .bat next to "Plain Craft Launcher 2.exe" and double-click it,
rem    or drag the exe onto this .bat. A backup (*.bak_yyyyMMdd_HHmmss) is made
rem    before the exe is modified.
rem
rem  Option: --no-pause   do not wait for a key press when finished.
rem ==========================================================================
setlocal EnableExtensions

set "BATFILE=%~f0"
set "PSFILE=%TEMP%\pcl_unlock_mcdl_%RANDOM%%RANDOM%.ps1"

powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "$bytes=[IO.File]::ReadAllBytes($env:BATFILE);$u=New-Object Text.UTF8Encoding($false,$true);try{$b=$u.GetString($bytes)}catch{$b=[Text.Encoding]::GetEncoding(936).GetString($bytes)};$m='#@@PCL_UNLOCK_PS_BEGIN@@#';$i=$b.LastIndexOf($m);if($i -lt 0){exit 9};$c=$b.Substring($i+$m.Length).TrimStart([char[]](13,10));[IO.File]::WriteAllText($env:PSFILE,$c,(New-Object Text.UTF8Encoding($true)))"

if errorlevel 1 (
    echo.
    echo [ERROR] Failed to prepare the patch script. Windows PowerShell is required.
    pause
    exit /b 1
)

powershell.exe -NoProfile -ExecutionPolicy Bypass -File "%PSFILE%" -BatDir "%~dp0." -CurrentDir "%CD%" -Target "%~1"
set "RC=%ERRORLEVEL%"
del /f /q "%PSFILE%" >nul 2>&1

echo.
if /i "%~1"=="--no-pause" exit /b %RC%
pause
exit /b %RC%

#@@PCL_UNLOCK_PS_BEGIN@@#
# ==========================================================================
#  PCL 下载限制解除补丁：直接修改 Plain Craft Launcher 2.exe
#
#  原理：开源版编译时 RestrictMcDownload=True 被编译器折叠，下载页的
#        LoaderInit 被替换成“关闭下载”的 LoaderTask（一运行就抛异常）。
#        本脚本把该方法体改回使用真正的版本列表加载器
#        PCL.ModDownload::DlClientListLoader，其它代码一律不动。
#
#  用法：把 .bat 放到 exe 同目录双击，或把 exe 拖到 .bat 上。
#        修改前自动备份；重复运行是安全的。
# ==========================================================================
param(
    [string]$BatDir = '',
    [string]$CurrentDir = '',
    [string]$Target = ''
)

$ErrorActionPreference = 'Stop'

# 输出被重定向（管道/文件）时改用 UTF-8，避免中文乱码
if ([Console]::IsOutputRedirected) {
    try { [Console]::OutputEncoding = New-Object System.Text.UTF8Encoding($false) } catch { }
}

$script:ExeName = 'Plain Craft Launcher 2.exe'
$script:Steps = 5
$script:MethodFlags = [Reflection.BindingFlags]'Public,NonPublic,Instance,Static,DeclaredOnly'

function Write-Step {
    param([int]$Number, [string]$Text)
    Write-Host ('  [{0}/{1}] {2}' -f $Number, $script:Steps, $Text) -ForegroundColor Yellow
}

function Write-Detail {
    param([string]$Text)
    Write-Host ('        ' + $Text) -ForegroundColor Gray
}

function Write-Fail {
    param([string]$Text)
    Write-Host ''
    Write-Host ('  [失败] ' + $Text) -ForegroundColor Red
}

function Resolve-ExePath {
    param([string]$Target, [string[]]$Dirs)
    $found = New-Object System.Collections.ArrayList

    if (-not [string]::IsNullOrWhiteSpace($Target)) {
        if (Test-Path -LiteralPath $Target -PathType Leaf) {
            $full = [IO.Path]::GetFullPath($Target)
            if ([IO.Path]::GetExtension($full) -ieq '.exe') { [void]$found.Add($full) }
        }
    }

    foreach ($dir in $Dirs) {
        if ([string]::IsNullOrWhiteSpace($dir)) { continue }
        if (-not (Test-Path -LiteralPath $dir -PathType Container)) { continue }
        $exact = Join-Path $dir $script:ExeName
        if (Test-Path -LiteralPath $exact -PathType Leaf) {
            [void]$found.Add((Resolve-Path -LiteralPath $exact).Path)
            continue
        }
        $alt = Get-ChildItem -LiteralPath $dir -Filter '*Craft Launcher*.exe' -File -ErrorAction SilentlyContinue | Select-Object -First 1
        if ($alt) { [void]$found.Add($alt.FullName) }
    }

    if ($found.Count -eq 0) { return $null }
    return $found[0]
}

function Get-PclInfo {
    param([byte[]]$Bytes)

    $asm = [Reflection.Assembly]::Load($Bytes)
    $type = $asm.GetType('PCL.PageDownloadInstall', $false)
    if ($null -eq $type) { throw '找不到 PCL.PageDownloadInstall 类型，这可能不是 PCL 主程序。' }

    $method = $type.GetMethod('LoaderInit', $script:MethodFlags)
    if ($null -eq $method) { throw '找不到 LoaderInit 方法，exe 版本不受支持。' }

    $modDownload = $asm.GetType('PCL.ModDownload', $false)
    if ($null -eq $modDownload) { throw '找不到 PCL.ModDownload 类型，exe 版本不受支持。' }

    $field = $modDownload.GetField('DlClientListLoader', [Reflection.BindingFlags]'Public,Static')
    if ($null -eq $field) { throw '找不到 DlClientListLoader 字段，exe 版本不受支持。' }

    return [pscustomobject]@{
        Assembly = $asm
        Type     = $type
        Method   = $method
        IL       = $method.GetMethodBody().GetILAsByteArray()
        Token    = $field.MetadataToken
    }
}

function Test-RestrictedIL {
    param([byte[]]$IL)
    return (
        $IL.Length -eq 94 -and
        $IL[0x19] -eq 0x14 -and   # ldnull
        $IL[0x1A] -eq 0x72 -and   # ldstr "关闭下载"
        $IL[0x1F] -eq 0x7E -and   # ldsfld <closure>
        $IL[0x4A] -eq 0x02 -and   # ldarg.0
        $IL[93] -eq 0x2A          # ret
    )
}

function Test-UnlockedIL {
    param([byte[]]$IL, [int]$Token)
    if ($IL.Length -lt 0x20) { return $false }
    if ($IL[0x1A] -ne 0x7E) { return $false }
    return ([BitConverter]::ToInt32($IL, 0x1B) -eq $Token)
}

function New-Backup {
    param([string]$Path)
    $stamp = Get-Date -Format 'yyyyMMdd_HHmmss'
    $bak = ('{0}.bak_{1}' -f $Path, $stamp)
    $n = 1
    while (Test-Path -LiteralPath $bak) {
        $bak = ('{0}.bak_{1}_{2}' -f $Path, $stamp, $n)
        $n++
    }
    Copy-Item -LiteralPath $Path -Destination $bak -Force
    return $bak
}

function Restore-Backup {
    param([string]$Path, [string]$Backup)
    try {
        Copy-Item -LiteralPath $Backup -Destination $Path -Force
        return $true
    } catch {
        return $false
    }
}

try {
    Write-Host ''
    Write-Host '  ==============================================================' -ForegroundColor Cyan
    Write-Host '   PCL 下载限制解除（直接修改 Plain Craft Launcher 2.exe）' -ForegroundColor Cyan
    Write-Host '  ==============================================================' -ForegroundColor Cyan
    Write-Host ''

    # ---------- 1. 定位 exe ----------
    Write-Step 1 '正在定位 Plain Craft Launcher 2.exe ...'
    $exePath = Resolve-ExePath -Target $Target -Dirs @($BatDir, $CurrentDir, (Get-Location).Path)
    if (-not $exePath) {
        Write-Fail '没有找到 Plain Craft Launcher 2.exe。'
        Write-Host '  请把本脚本放到 PCL 所在文件夹后运行，或把 exe 拖到本脚本上。' -ForegroundColor Gray
        exit 1
    }
    Write-Detail ('程序路径：' + $exePath)
    $fileSize = (Get-Item -LiteralPath $exePath -Force).Length

    # ---------- 2. 分析程序 ----------
    Write-Step 2 '正在分析程序版本 ...'
    $bytes = [IO.File]::ReadAllBytes($exePath)
    try {
        $info = Get-PclInfo -Bytes $bytes
    } catch {
        Write-Fail $_.Exception.Message
        Write-Host '  本工具只支持 PCL 2.x 的 .NET 版 Plain Craft Launcher 2.exe。' -ForegroundColor Gray
        exit 1
    }
    Write-Detail ('版本：' + $info.Assembly.GetName().Version + '，文件大小：' + $fileSize + ' 字节')

    if (Test-UnlockedIL -IL $info.IL -Token $info.Token) {
        Write-Host ''
        Write-Host '  这个 exe 已经解除过下载限制，无需重复修改。' -ForegroundColor Green
        Write-Detail '如需还原：用同目录下的 *.bak_* 备份文件覆盖回来即可。'
        exit 0
    }

    if (-not (Test-RestrictedIL -IL $info.IL)) {
        Write-Fail '没有找到预期的“关闭下载”代码，这个 exe 版本暂不支持。'
        Write-Detail ('LoaderInit 长度：' + $info.IL.Length + ' 字节（预期 94）')
        exit 1
    }

    # ---------- 3. 备份 ----------
    Write-Step 3 '正在备份原程序 ...'
    $backupPath = New-Backup -Path $exePath
    Write-Detail ('备份：' + $backupPath)

    # ---------- 4. 修改 ----------
    Write-Step 4 '正在写入补丁 ...'
    Write-Detail 'LoaderInit：限制加载器 -> DlClientListLoader'

    $latin1 = [Text.Encoding]::GetEncoding(28591)
    $haystack = $latin1.GetString($bytes)
    $needle = $latin1.GetString($info.IL)
    $ilOffset = $haystack.IndexOf($needle, [StringComparison]::Ordinal)
    if ($ilOffset -lt 0) {
        Write-Fail '在 exe 文件里找不到 LoaderInit 的代码，已放弃修改。'
        exit 1
    }
    if ($haystack.IndexOf($needle, $ilOffset + 1, [StringComparison]::Ordinal) -ge 0) {
        Write-Fail '文件中匹配到多处相同代码，为避免误改已停止。'
        exit 1
    }

    $patchedIL = [byte[]]$info.IL.Clone()
    $patchedIL[0x1A] = 0x7E
    [Array]::Copy([BitConverter]::GetBytes($info.Token), 0, $patchedIL, 0x1B, 4)
    for ($i = 0x1F; $i -lt 0x4A; $i++) { $patchedIL[$i] = 0x00 }

    $patchOffset = $ilOffset + 0x1A
    for ($i = 0; $i -lt 48; $i++) { $bytes[$patchOffset + $i] = $patchedIL[0x1A + $i] }

    $item = Get-Item -LiteralPath $exePath -Force
    $wasReadOnly = $item.IsReadOnly
    if ($wasReadOnly) { $item.IsReadOnly = $false }
    try {
        [IO.File]::WriteAllBytes($exePath, $bytes)
    } catch {
        if ($wasReadOnly) { try { (Get-Item -LiteralPath $exePath -Force).IsReadOnly = $true } catch { } }
        [void](Restore-Backup -Path $exePath -Backup $backupPath)
        Write-Fail '写入失败，请先完全退出 PCL（包括托盘图标）后重试。'
        Write-Host ('        ' + $_.Exception.Message) -ForegroundColor DarkGray
        exit 1
    } finally {
        if ($wasReadOnly) { try { (Get-Item -LiteralPath $exePath -Force).IsReadOnly = $true } catch { } }
    }

    # ---------- 5. 校验 ----------
    Write-Step 5 '正在校验修改结果 ...'
    $verify = Get-PclInfo -Bytes ([IO.File]::ReadAllBytes($exePath))
    if (-not (Test-UnlockedIL -IL $verify.IL -Token $verify.Token)) {
        [void](Restore-Backup -Path $exePath -Backup $backupPath)
        Write-Fail '写入后的校验没有通过，已自动还原为原程序。'
        exit 1
    }
    try {
        [Runtime.CompilerServices.RuntimeHelpers]::PrepareMethod($verify.Method.MethodHandle)
    } catch {
        [void](Restore-Backup -Path $exePath -Backup $backupPath)
        Write-Fail '补丁后的代码无法通过编译，已自动还原为原程序。'
        Write-Host ('        ' + $_.Exception.Message) -ForegroundColor DarkGray
        exit 1
    }
    Write-Detail '校验通过：代码可正常编译，下载加载
```存成`.bat`

bat脚本要和`Plain Craft Launcher 2.exe`放在同一个文件夹 运行bat即可

原理: 更换PCL内版本列表加载器

脚本bat本体:

PCL解除下载限制.zip (4.6 KB)

实测 2026-10-20T12:24:00Z 最新版的 **2.99.0.0** PCL2 可以解除下载限制

![图片](https://cdn3.ldstatic.com/optimized/4X/c/3/f/c3f4fb4fb77212e3f829ccce1dd2ef4c59c067d0_2_690x409.png)
    主楼
  • 深入交流
    深入交流5天前
    11436

    还以为发码了，第一个进来了。

    #1
  • 16201010101
    162010101015天前
    18380

    没想到刚刷到被举报、修复方案就来了、感谢佬友 ^-^

    #2
  • heart_of_god_lin
    heart_of_god_lin5天前
    18423

    很久没打开mc了，这是改了pcl2啥功能，我记得pcl2没啥大限制啊 ^-^

    #3
  • alicemiff
    alicemiff5天前
    18424

    被举报了、后续不再提供下载功能了

    #4

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