private AttachedThreadInputScope()
{
s_current.Value?.Dispose();
s_current.Value = this;
_foregroundWindow = WinApi.GetForegroundWindow();
_currentThreadId = WinApi.GetCurrentThreadId();
_foregroundThreadId = WinApi.GetWindowThreadProcessId(_foregroundWindow, out var _);
if (_currentThreadId != _foregroundThreadId)
{
// attach to the foreground thread
if (!WinApi.AttachThreadInput(_currentThreadId, _foregroundThreadId, true))
{
// unable to attach, see if the window is a Win10 Console Window
var className = new StringBuilder(capacity: 256);
WinApi.GetClassName(_foregroundWindow, className, className.Capacity - 1);
if (String.CompareOrdinal("ConsoleWindowClass", className.ToString()) != 0)
{
return;
}
// consider attached to a console window
}
}
_attached = true;
}
public static bool TryGetThirdPartyForgroundWindow(out IntPtr hwnd)
{
hwnd = IntPtr.Zero;
var foregroundWindow = WinApi.GetForegroundWindow();
var currentThreadId = WinApi.GetCurrentThreadId();
var foregroundThread = WinApi.GetWindowThreadProcessId(foregroundWindow, out var _);
if (currentThreadId == foregroundThread)
{
return(false);
}
else
{
var hwndRoot = WinApi.GetAncestor(foregroundWindow, WinApi.GA_ROOT);
if (hwndRoot != IntPtr.Zero)
{
foregroundWindow = hwndRoot;
}
var className = new StringBuilder(capacity: 256);
WinApi.GetClassName(foregroundWindow, className, className.Capacity - 1);
if (className.ToString().CompareTo("Shell_TrayWnd") == 0)
{
return(false);
}
hwnd = foregroundWindow;
return(true);
}
}
private AttachedThreadInputScope()
{
s_current.Value?.Dispose();
s_current.Value = this;
_foregroundWindow = WinApi.GetForegroundWindow();
_currentThreadId = WinApi.GetCurrentThreadId();
_foregroundThreadId = WinApi.GetWindowThreadProcessId(_foregroundWindow, out var _);
if (_currentThreadId != _foregroundThreadId)
{
// attach to the foreground thread
if (!WinApi.AttachThreadInput(_foregroundThreadId, _currentThreadId, true))
{
return;
}
}
_attached = true;
}
private async static ValueTask <(bool left, bool right)> GetLeftRightCtrlStateAsync(uint delay, CancellationToken token)
{
// this is used purely for debugging and so we utilize
// native CreateTimerQueueTimer with WT_EXECUTEINPERSISTENTTHREAD
// for keyboard polling here, because we don't want
// to pollute ThreadPool threads with AttachThreadInput other user32 calls
var tcs = new TaskCompletionSource <(bool, bool)>(TaskCreationOptions.RunContinuationsAsynchronously);
using var rego = token.Register(() => tcs.SetCanceled(), useSynchronizationContext: false);
WinApi.WaitOrTimerCallbackProc timerCallback = delegate
{
try
{
// attach the to the foreground thread to read the keyboard status
var currentThread = WinApi.GetCurrentThreadId();
var foregroundWindow = WinApi.GetForegroundWindow();
var foregroundThread = WinApi.GetWindowThreadProcessId(foregroundWindow, out uint foregroundProcess);
var attached = WinApi.AttachThreadInput(foregroundThread, currentThread, true);
try
{
var leftCtrl = (WinApi.GetAsyncKeyState(WinApi.VK_LCONTROL) & 0x8000) != 0;
var rightCtrl = (WinApi.GetAsyncKeyState(WinApi.VK_RCONTROL) & 0x8000) != 0;
tcs.TrySetResult((leftCtrl, rightCtrl));
}
finally
{
if (attached)
{
WinApi.AttachThreadInput(foregroundThread, currentThread, false);
}
}
}
catch (Exception ex)
{
tcs.TrySetException(ex);
}
};
var gcHandle = GCHandle.Alloc(timerCallback);
IntPtr timerHandle = IntPtr.Zero;
try
{
if (!WinApi.CreateTimerQueueTimer(
out timerHandle,
IntPtr.Zero,
timerCallback,
IntPtr.Zero, delay, 0,
(UIntPtr)(WinApi.WT_EXECUTEINPERSISTENTTHREAD | WinApi.WT_EXECUTEONLYONCE)))
{
throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
}
return(await tcs.Task);
}
finally
{
if (timerHandle != IntPtr.Zero)
{
WinApi.DeleteTimerQueueTimer(IntPtr.Zero, timerHandle, IntPtr.Zero);
}
gcHandle.Free();
}
}
