genshin-assistant/electron/services/inputHelperPowerShellFallback.ts

// PowerShell fallback for environments where the compiled C# sidecar is unavailable. Keep the JSON protocol aligned with native/input-helper/Program.cs.

export const INPUT_HELPER_SCRIPT = String.raw`
$ErrorActionPreference = "Stop"
Add-Type -AssemblyName System.Drawing
Add-Type -AssemblyName System.Windows.Forms

$signature = @"
[DllImport("user32.dll")]
public static extern bool SetProcessDPIAware();
[DllImport("shcore.dll")]
public static extern int SetProcessDpiAwareness(int value);
[DllImport("user32.dll")]
public static extern bool SetCursorPos(int X, int Y);
[DllImport("user32.dll")]
public static extern bool GetCursorPos(out POINT lpPoint);
[DllImport("user32.dll", SetLastError=true)]
public static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);
[DllImport("user32.dll", SetLastError=true)]
public static extern bool ClientToScreen(IntPtr hWnd, ref POINT lpPoint);
[DllImport("user32.dll")]
public static extern short GetAsyncKeyState(int vKey);
[DllImport("user32.dll", SetLastError=true)]
public static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);
[DllImport("user32.dll")]
public static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
[DllImport("user32.dll")]
public static extern bool BringWindowToTop(IntPtr hWnd);
[DllImport("user32.dll", SetLastError=true)]
public static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);
[DllImport("kernel32.dll")]
public static extern uint GetCurrentThreadId();
[DllImport("user32.dll", SetLastError=true, EntryPoint="SystemParametersInfoW")]
public static extern bool SystemParametersInfoGet(uint uiAction, uint uiParam, ref uint pvParam, uint fWinIni);
[DllImport("user32.dll", SetLastError=true, EntryPoint="SystemParametersInfoW")]
public static extern bool SystemParametersInfoSet(uint uiAction, uint uiParam, IntPtr pvParam, uint fWinIni);
[DllImport("user32.dll")]
public static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll")]
public static extern bool IsWindow(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

[StructLayout(LayoutKind.Sequential)]
public struct POINT { public int X; public int Y; }

[StructLayout(LayoutKind.Sequential)]
public struct RECT { public int Left; public int Top; public int Right; public int Bottom; }

[StructLayout(LayoutKind.Sequential)]
public struct MOUSEINPUT { public int dx; public int dy; public uint mouseData; public uint dwFlags; public uint time; public UIntPtr dwExtraInfo; }

[StructLayout(LayoutKind.Sequential)]
public struct INPUT { public int type; public MOUSEINPUT mi; }
"@
Add-Type -MemberDefinition $signature -Name InputHelper -Namespace Native
# Per-monitor DPI awareness (matches GenshinArtScanner's proven fix for the
# same symptom): the older SetProcessDPIAware() only applies a single,
# system-wide scale factor. On a mixed-DPI multi-monitor setup (e.g. Genshin
# on one display, this app's window on a differently-scaled second display),
# that single scale factor is wrong for whichever monitor didn't set it,
# silently shifting every SetCursorPos/click coordinate off-target even
# though cursor readback still matches what we asked for (both go through the
# same, wrong, virtualization layer). PROCESS_PER_MONITOR_DPI_AWARE = 2.
try {
  [Native.InputHelper]::SetProcessDpiAwareness(2) | Out-Null
} catch {
  [Native.InputHelper]::SetProcessDPIAware() | Out-Null
}
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8

# SizeOf must receive a struct instance: passing the type object throws in
# Windows PowerShell 5.1 (RuntimeType cannot be marshalled).
$inputSize = [Runtime.InteropServices.Marshal]::SizeOf((New-Object Native.InputHelper+INPUT))
$genshinHwnd = [IntPtr]::Zero

function Send-MouseInput {
  param([uint32]$flags, [int]$dx = 0, [int]$dy = 0, [long]$wheelData = 0)
  $mouseInput = New-Object Native.InputHelper+INPUT
  $mouseInput.type = 0
  $mouseInput.mi.dx = $dx
  $mouseInput.mi.dy = $dy
  if ($wheelData -lt 0) { $mouseInput.mi.mouseData = [uint32](4294967296 + $wheelData) } else { $mouseInput.mi.mouseData = [uint32]$wheelData }
  $mouseInput.mi.dwFlags = $flags
  return [Native.InputHelper]::SendInput(1, [Native.InputHelper+INPUT[]]@($mouseInput), $inputSize)
}

# Uses bare SetCursorPos, then sends button-down and button-up as ONE SendInput
# call (two INPUT structs in the same array) - back-to-back with no artificial
# delay between them, unlike two separate SendInput calls with a
# Start-Sleep in between. Returns the number of injected events (2 = ok).
function Send-MouseClickBatch {
  $down = New-Object Native.InputHelper+INPUT
  $down.type = 0
  $down.mi.dwFlags = 0x0002
  $up = New-Object Native.InputHelper+INPUT
  $up.type = 0
  $up.mi.dwFlags = 0x0004
  return [Native.InputHelper]::SendInput(2, [Native.InputHelper+INPUT[]]@($down, $up), $inputSize)
}

function Send-KeyPressBatch {
  param([int]$virtualKey)
  $down = New-Object Native.InputHelper+INPUT
  $down.type = 1
  $down.mi.dx = $virtualKey
  $up = New-Object Native.InputHelper+INPUT
  $up.type = 1
  $up.mi.dx = $virtualKey
  # Same union bytes as KEYBDINPUT: dx low word = wVk, dy = dwFlags.
  $up.mi.dy = 0x0002
  return [Native.InputHelper]::SendInput(2, [Native.InputHelper+INPUT[]]@($down, $up), $inputSize)
}

function Resolve-VirtualKey {
  param([string]$key)
  switch ($key.ToUpperInvariant()) {
    "ESC" { return 27 }
    "ESCAPE" { return 27 }
    "ENTER" { return 13 }
    "B" { return 66 }
    "C" { return 67 }
    "1" { return 49 }
    default { throw "unsupported key: $key" }
  }
}

function Get-CursorPoint {
  $pt = New-Object Native.InputHelper+POINT
  [Native.InputHelper]::GetCursorPos([ref]$pt) | Out-Null
  return $pt
}

function Get-ProcessNameFromHwnd {
  param([IntPtr]$hwnd)
  if ($hwnd -eq [IntPtr]::Zero) { return "" }
  $pidValue = [uint32]0
  [Native.InputHelper]::GetWindowThreadProcessId($hwnd, [ref]$pidValue) | Out-Null
  if ($pidValue -eq 0) { return "" }
  try {
    return (Get-Process -Id ([int]$pidValue) -ErrorAction Stop).ProcessName
  } catch {
    return ""
  }
}

function Get-CurrentProcessElevation {
  $identity = [Security.Principal.WindowsIdentity]::GetCurrent()
  $principal = New-Object Security.Principal.WindowsPrincipal($identity)
  return $principal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
}

function Get-ForegroundInfo {
  $hwnd = [Native.InputHelper]::GetForegroundWindow()
  return @{
    foregroundHwnd = $hwnd.ToInt64()
    foregroundProcess = Get-ProcessNameFromHwnd -hwnd $hwnd
  }
}

function Get-CursorState {
  $pt = New-Object Native.InputHelper+POINT
  [Native.InputHelper]::GetCursorPos([ref]$pt) | Out-Null
  # Only 0x8000 (key is held down right now). The 0x0001 "pressed since last
  # call" bit is unreliable and fires for ESC presses that happened long
  # before the scan (ESC is used constantly to navigate Genshin menus).
  $esc = ([Native.InputHelper]::GetAsyncKeyState(27) -band 0x8000) -ne 0
  $enter = ([Native.InputHelper]::GetAsyncKeyState(13) -band 0x8000) -ne 0
  $f9 = ([Native.InputHelper]::GetAsyncKeyState(120) -band 0x8000) -ne 0
  return @{ cursorX = $pt.X; cursorY = $pt.Y; escapePressed = $esc; enterPressed = $enter; f9Pressed = $f9 }
}

function Get-GenshinClientBounds {
  $hwnd = Find-GenshinWindow
  if ($hwnd -eq [IntPtr]::Zero) { return $null }

  $rect = New-Object Native.InputHelper+RECT
  if (-not [Native.InputHelper]::GetClientRect($hwnd, [ref]$rect)) { return $null }

  $topLeft = New-Object Native.InputHelper+POINT
  $topLeft.X = 0
  $topLeft.Y = 0
  if (-not [Native.InputHelper]::ClientToScreen($hwnd, [ref]$topLeft)) { return $null }

  $width = $rect.Right - $rect.Left
  $height = $rect.Bottom - $rect.Top
  if ($width -le 0 -or $height -le 0) { return $null }

  return @{
    Left = $topLeft.X
    Top = $topLeft.Y
    Width = $width
    Height = $height
  }
}

function Find-GenshinWindow {
  if ($script:genshinHwnd -ne [IntPtr]::Zero -and [Native.InputHelper]::IsWindow($script:genshinHwnd)) { return $script:genshinHwnd }
  $proc = Get-Process | Where-Object { $_.ProcessName -match 'GenshinImpact|YuanShen|Genshin' -and $_.MainWindowHandle -ne 0 } | Select-Object -First 1
  if ($proc) { $script:genshinHwnd = $proc.MainWindowHandle } else { $script:genshinHwnd = [IntPtr]::Zero }
  return $script:genshinHwnd
}

# Plain SetForegroundWindow from this background helper process is silently
# refused by Windows' foreground lock. Attach our thread's input queue to the
# target (and current foreground) window thread and clear the lock timeout, so
# the foreground change is honored.
function Force-Foreground {
  param([IntPtr]$hwnd)
  $current = [Native.InputHelper]::GetCurrentThreadId()
  $targetPid = [uint32]0
  $target = [Native.InputHelper]::GetWindowThreadProcessId($hwnd, [ref]$targetPid)
  $fgWindow = [Native.InputHelper]::GetForegroundWindow()
  $foreground = [uint32]0
  if ($fgWindow -ne [IntPtr]::Zero) {
    $fgPid = [uint32]0
    $foreground = [Native.InputHelper]::GetWindowThreadProcessId($fgWindow, [ref]$fgPid)
  }

  $attachedTarget = $false
  $attachedForeground = $false
  $oldTimeout = [uint32]0
  $timeoutRead = $false
  try {
    if ($target -ne 0 -and $target -ne $current) { $attachedTarget = [Native.InputHelper]::AttachThreadInput($current, $target, $true) }
    if ($foreground -ne 0 -and $foreground -ne $current -and $foreground -ne $target) { $attachedForeground = [Native.InputHelper]::AttachThreadInput($current, $foreground, $true) }
    $timeoutRead = [Native.InputHelper]::SystemParametersInfoGet(0x2000, 0, [ref]$oldTimeout, 0)
    [Native.InputHelper]::SystemParametersInfoSet(0x2001, 0, [IntPtr]::Zero, 0x0002) | Out-Null
    # Inject a no-op input (0,0 mouse move) so this process is the last input
    # source, which Windows requires before it will honor a foreground change.
    Send-MouseInput -flags 0x0001 | Out-Null
    [Native.InputHelper]::ShowWindowAsync($hwnd, 9) | Out-Null
    [Native.InputHelper]::BringWindowToTop($hwnd) | Out-Null
    return [Native.InputHelper]::SetForegroundWindow($hwnd)
  } finally {
    if ($timeoutRead) { [Native.InputHelper]::SystemParametersInfoSet(0x2001, 0, [IntPtr]::new([int64]$oldTimeout), 0x0002) | Out-Null }
    if ($attachedForeground) { [Native.InputHelper]::AttachThreadInput($current, $foreground, $false) | Out-Null }
    if ($attachedTarget) { [Native.InputHelper]::AttachThreadInput($current, $target, $false) | Out-Null }
  }
}

function Focus-GenshinWindow {
  $hwnd = Find-GenshinWindow
  $info = @{
    hwnd = $hwnd.ToInt64()
    focused = $false
    alreadyForeground = $false
    foregroundProcess = ""
    targetProcess = Get-ProcessNameFromHwnd -hwnd $hwnd
  }
  if ($hwnd -eq [IntPtr]::Zero) { return $info }

  $info.alreadyForeground = ([Native.InputHelper]::GetForegroundWindow() -eq $hwnd)
  if (-not $info.alreadyForeground) {
    $info.setForegroundResult = Force-Foreground -hwnd $hwnd
    Start-Sleep -Milliseconds 140
  }

  $foreground = [Native.InputHelper]::GetForegroundWindow()
  $info.focused = ($foreground -eq $hwnd)
  $info.foregroundProcess = Get-ProcessNameFromHwnd -hwnd $foreground
  return $info
}

while ($true) {
  $line = [Console]::In.ReadLine()
  if ($null -eq $line) { break }
  if ($line.Trim().Length -eq 0) { continue }
  $response = @{ id = ""; ok = $true }
  try {
    $cmd = $line | ConvertFrom-Json
    $response.id = "$($cmd.id)"
    switch ("$($cmd.op)") {
      "ping" {
        $response.pong = $true
      }
      "cursor" {
        $state = Get-CursorState
        $response.cursorX = $state.cursorX
        $response.cursorY = $state.cursorY
        $response.escapePressed = $state.escapePressed
        $response.enterPressed = $state.enterPressed
        $response.f9Pressed = $state.f9Pressed
      }
      "runtime" {
        $response.isElevated = Get-CurrentProcessElevation
        $hwnd = Find-GenshinWindow
        $foregroundInfo = Get-ForegroundInfo
        $response.genshinFound = ($hwnd -ne [IntPtr]::Zero)
        $response.genshinHwnd = $hwnd.ToInt64()
        $response.targetProcess = Get-ProcessNameFromHwnd -hwnd $hwnd
        $response.foregroundProcess = $foregroundInfo.foregroundProcess
        $response.foregroundHwnd = $foregroundInfo.foregroundHwnd
        $response.helperPid = $PID
      }
      "focus" {
        $focusInfo = Focus-GenshinWindow
        $response.focused = $focusInfo.focused
        $response.alreadyForeground = $focusInfo.alreadyForeground
        $response.foregroundProcess = $focusInfo.foregroundProcess
        $response.targetProcess = $focusInfo.targetProcess
        $response.genshinFound = ($focusInfo.hwnd -ne 0)
        $response.setForegroundResult = $focusInfo.setForegroundResult
      }
      "click" {
        $focusInfo = Focus-GenshinWindow
        if ($focusInfo.focused -and -not $focusInfo.alreadyForeground) {
          Start-Sleep -Milliseconds 120
        }
        $targetX = [int]$cmd.x
        $targetY = [int]$cmd.y
        # Bare SetCursorPos immediately followed by a click, with NO extra move
        # event and NO artificial delay between moving and clicking. Settling
        # delays only happen after the click, in the scan loop. Down+up are sent
        # as one SendInput call (see Send-MouseClickBatch).
        [Native.InputHelper]::SetCursorPos($targetX, $targetY) | Out-Null
        $point = Get-CursorPoint
        $onTarget = (([Math]::Abs($targetX - $point.X) -le 2) -and ([Math]::Abs($targetY - $point.Y) -le 2))
        $clickEventsSent = 0
        if ($onTarget) {
          $clickEventsSent = Send-MouseClickBatch
        }
        $state = Get-CursorState
        $response.cursorX = $state.cursorX
        $response.cursorY = $state.cursorY
        $response.escapePressed = $state.escapePressed
        $response.enterPressed = $state.enterPressed
        $response.f9Pressed = $state.f9Pressed
        $response.moved = $onTarget
        $response.focused = $focusInfo.focused
        $response.alreadyForeground = $focusInfo.alreadyForeground
        $response.foregroundProcess = $focusInfo.foregroundProcess
        $response.targetProcess = $focusInfo.targetProcess
        $response.isElevated = Get-CurrentProcessElevation
        # Never report a click unless the cursor is verifiably on the target.
        # Real acceptance is proven later by the detail-panel fingerprint.
        $response.clicked = ($onTarget -and $clickEventsSent -ge 2)
        $response.inputBlocked = ($onTarget -and $clickEventsSent -lt 2)
      }
      "scroll" {
        $focusInfo = Focus-GenshinWindow
        if ($focusInfo.focused -and -not $focusInfo.alreadyForeground) {
          Start-Sleep -Milliseconds 120
        }
        if ($null -ne $cmd.x -and $null -ne $cmd.y) {
          [Native.InputHelper]::SetCursorPos([int]$cmd.x, [int]$cmd.y) | Out-Null
          Start-Sleep -Milliseconds 30
        }
        $point = Get-CursorPoint
        $response.cursorX = $point.X
        $response.cursorY = $point.Y
        $response.focused = $focusInfo.focused
        $response.foregroundProcess = $focusInfo.foregroundProcess
        $response.isElevated = Get-CurrentProcessElevation
        $notches = [int]$cmd.notches
        $stepDelta = 120
        if ($notches -lt 0) { $stepDelta = -120 }
        $count = [Math]::Abs($notches)
        if ($count -gt 60) { $count = 60 }
        $sentTotal = 0
        for ($i = 0; $i -lt $count; $i++) {
          $sentTotal += Send-MouseInput -flags 0x0800 -wheelData $stepDelta
          Start-Sleep -Milliseconds 45
        }
        $response.notchesSent = $sentTotal
        $response.inputBlocked = (($count -gt 0) -and ($sentTotal -eq 0))
      }
      "key" {
        $focusInfo = Focus-GenshinWindow
        if ($focusInfo.focused -and -not $focusInfo.alreadyForeground) {
          Start-Sleep -Milliseconds 120
        }
        $vk = Resolve-VirtualKey -key "$($cmd.key)"
        $sent = Send-KeyPressBatch -virtualKey $vk
        $response.key = "$($cmd.key)"
        $response.focused = $focusInfo.focused
        $response.foregroundProcess = $focusInfo.foregroundProcess
        $response.targetProcess = $focusInfo.targetProcess
        $response.isElevated = Get-CurrentProcessElevation
        $response.eventsSent = $sent
        $response.inputBlocked = ($sent -lt 2)
      }
      "bounds" {
        $clientBounds = Get-GenshinClientBounds
        if ($null -eq $clientBounds) {
          $response.found = $false
        } else {
          $response.found = $true
          $response.left = $clientBounds.Left
          $response.top = $clientBounds.Top
          $response.width = $clientBounds.Width
          $response.height = $clientBounds.Height
        }
      }
      "capture" {
        $clientBounds = Get-GenshinClientBounds
        if ($null -eq $clientBounds) {
          $screenBounds = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds
          $clientBounds = @{
            Left = $screenBounds.Left
            Top = $screenBounds.Top
            Width = $screenBounds.Width
            Height = $screenBounds.Height
          }
          $response.captureTarget = "primary-screen"
        } else {
          $response.captureTarget = "genshin-client"
        }
        $bitmap = New-Object System.Drawing.Bitmap $clientBounds.Width, $clientBounds.Height
        $graphics = [System.Drawing.Graphics]::FromImage($bitmap)
        $graphics.CopyFromScreen($clientBounds.Left, $clientBounds.Top, 0, 0, $bitmap.Size)
        $capturePath = [System.IO.Path]::Combine([System.IO.Path]::GetTempPath(), "genshin-assistant-capture-" + [Guid]::NewGuid().ToString() + ".png")
        $bitmap.Save($capturePath, [System.Drawing.Imaging.ImageFormat]::Png)
        $graphics.Dispose()
        $bitmap.Dispose()
        $response.path = $capturePath
        $response.width = $clientBounds.Width
        $response.height = $clientBounds.Height
        $response.originX = $clientBounds.Left
        $response.originY = $clientBounds.Top
      }
      default {
        $response.ok = $false
        $response.error = "unknown op"
      }
    }
  } catch {
    $response.ok = $false
    $response.error = $_.Exception.Message
  }
  Write-Output (ConvertTo-Json $response -Compress)
}
`;