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fix(input): force Genshin foreground via AttachThreadInput (auto-scan no longer aborts)

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Auto-scan aborted immediately with "Genshin konnte nicht in den Vordergrund
geholt werden". Root cause: the focus call runs in the background input/capture
helper process, and Windows' foreground lock silently refuses SetForegroundWindow
from a process that is neither foreground nor the last input source. When the user
clicks "Auto-Scan starten" the Electron window is foreground, so the helper's plain
SetForegroundWindow is dropped and focus stays false.

Fix (both the C# sidecar and the PowerShell fallback): before SetForegroundWindow,
attach our thread's input queue to the target (and current-foreground) window
thread with AttachThreadInput and clear SPI_..FOREGROUNDLOCKTIMEOUT, then restore.
This is the same technique Inventory Kamera and other reliable automators use; it
is what our helper was missing after the old ALT-tap workaround was removed on the
wrong assumption that equal integrity level is sufficient (that only covers UIPI
input injection, not foreground changes).

Sidecar recompiled + republished; electron build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
AzuTear
2026-07-06 16:07:30 +02:00
parent 113601f031
commit c8ae0dd7bf
11 changed files with 255 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files
native/input-helper/Program.cs
+59 -5
View File
@@ -280,11 +280,7 @@ internal static class Program
info.AlreadyForeground = Native.GetForegroundWindow() == hwnd;
if (!info.AlreadyForeground)
{
Native.ShowWindowAsync(hwnd, 9); // SW_RESTORE
// No ALT tap: this app and Genshin run at the same (elevated)
// integrity level, so SetForegroundWindow succeeds on its own. An ALT
// tap would toggle menu-mnemonic mode and swallow the next inputs.
info.SetForegroundResult = Native.SetForegroundWindow(hwnd);
info.SetForegroundResult = ForceForeground(hwnd);
Thread.Sleep(140);
}
@@ -294,6 +290,46 @@ internal static class Program
return info;
}
// Plain SetForegroundWindow from a background process is silently refused by
// Windows' foreground lock. Inventory Kamera and other reliable automation
// tools bypass it by attaching the calling thread's input queue to the target
// (and current-foreground) window thread and clearing the lock timeout, so the
// foreground change is honored. Without this the auto-scan aborts with
// "Genshin konnte nicht in den Vordergrund geholt werden".
private static bool ForceForeground(IntPtr hwnd)
{
var current = Native.GetCurrentThreadId();
var target = Native.GetWindowThreadProcessId(hwnd, out _);
var foregroundHwnd = Native.GetForegroundWindow();
var foreground = foregroundHwnd != IntPtr.Zero ? Native.GetWindowThreadProcessId(foregroundHwnd, out _) : 0u;
var attachedTarget = false;
var attachedForeground = false;
uint oldTimeout = 0;
var timeoutRead = false;
try
{
if (target != 0 && target != current) attachedTarget = Native.AttachThreadInput(current, target, true);
if (foreground != 0 && foreground != current && foreground != target)
attachedForeground = Native.AttachThreadInput(current, foreground, true);
timeoutRead = Native.SystemParametersInfo(Native.SPI_GETFOREGROUNDLOCKTIMEOUT, 0, ref oldTimeout, 0);
Native.SystemParametersInfo(Native.SPI_SETFOREGROUNDLOCKTIMEOUT, 0, IntPtr.Zero, Native.SPIF_SENDCHANGE);
Native.ShowWindowAsync(hwnd, 9); // SW_RESTORE
Native.BringWindowToTop(hwnd);
var ok = Native.SetForegroundWindow(hwnd);
return ok;
}
finally
{
if (timeoutRead)
Native.SystemParametersInfo(Native.SPI_SETFOREGROUNDLOCKTIMEOUT, 0, new IntPtr((long)oldTimeout), Native.SPIF_SENDCHANGE);
if (attachedForeground) Native.AttachThreadInput(current, foreground, false);
if (attachedTarget) Native.AttachThreadInput(current, target, false);
}
}
private static IntPtr FindGenshinWindow()
{
if (_genshinHwnd != IntPtr.Zero && Native.IsWindow(_genshinHwnd)) return _genshinHwnd;
@@ -394,6 +430,9 @@ internal static class Native
public const uint MOUSEEVENTF_LEFTDOWN = 0x0002;
public const uint MOUSEEVENTF_LEFTUP = 0x0004;
public const uint MOUSEEVENTF_WHEEL = 0x0800;
public const uint SPI_GETFOREGROUNDLOCKTIMEOUT = 0x2000;
public const uint SPI_SETFOREGROUNDLOCKTIMEOUT = 0x2001;
public const uint SPIF_SENDCHANGE = 0x0002;
public static readonly IntPtr DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 = new(-4);
[StructLayout(LayoutKind.Sequential)]
@@ -455,6 +494,21 @@ internal static class Native
[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)]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam, ref uint pvParam, uint fWinIni);
[DllImport("user32.dll", SetLastError = true)]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam, IntPtr pvParam, uint fWinIni);
[DllImport("user32.dll")]
public static extern IntPtr GetForegroundWindow();