当我调整 WinUI 3 应用程序的大小时,它在程序中有一个
System.ExecutionEngineException
,我必须在按下热键时进行检测。
系统执行引擎异常 H结果=0x80131506 来源= 堆栈跟踪:
return PInvoke.CallWindowProc(wndProc, hWnd, Msg, wParam, lParam);
在我的应用程序中,我有一个
ToggleButton
,我想通过 F6 键进行切换。就正确切换按钮而言,一切工作正常,但每当我快速调整应用程序大小时,它就会崩溃。
我尝试检查窗口句柄是否为空,但没有解决问题。我也尝试通过处理它来获得更好的错误消息,但没有成功。
我使用 Visual Studio 2022 和空白应用程序,打包(桌面中的 WinUI 3)并安装了 CsWin32 软件包。
MainWindow.xaml.cs
:
using System;
using System.Runtime.InteropServices;
using Microsoft.UI.Xaml;
using Windows.Win32;
using Windows.Win32.Foundation;
using Windows.Win32.UI.Input.KeyboardAndMouse;
using Windows.Win32.UI.WindowsAndMessaging;
namespace HotkeySubclassing;
public sealed partial class MainWindow : Window
{
private WNDPROC wndProc = null!;
private LRESULT HotKeyProc(HWND hWnd, uint Msg, WPARAM wParam, LPARAM lParam)
{
uint WM_HOTKEY = 0x0312; // HotKey Window Message
if (Msg == WM_HOTKEY)
{
if (ToggleButton.IsEnabled)
{
ToggleButton.IsChecked = !ToggleButton.IsChecked;
}
}
return PInvoke.CallWindowProc(wndProc, hWnd, Msg, wParam, lParam); // Error happens on this line
}
public MainWindow()
{
this.InitializeComponent();
// Get window handle
HWND hWnd = new(WinRT.Interop.WindowNative.GetWindowHandle(this));
// Register hotkey
int id = 0x0000;
_ = PInvoke.RegisterHotKey(hWnd, id, HOT_KEY_MODIFIERS.MOD_NOREPEAT, 0x75); // F6
// Add hotkey function pointer to window procedure
WNDPROC hotKeyDelegate = HotKeyProc;
nint hotKeyProcPtr = Marshal.GetFunctionPointerForDelegate(hotKeyDelegate);
nint wndPtr = PInvoke.SetWindowLongPtr(hWnd, WINDOW_LONG_PTR_INDEX.GWL_WNDPROC, hotKeyProcPtr);
wndProc = Marshal.GetDelegateForFunctionPointer<WNDPROC>(wndPtr);
}
}
NativeMethods.txt
:
RegisterHotKey
UnregisterHotKey
SetWindowLongPtr
CallWindowProc
MainWindow.xaml
:
<?xml version="1.0" encoding="utf-8" ?>
<Window
x:Class="HotkeySubclassing.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Title="HotkeySubclassing"
mc:Ignorable="d">
<StackPanel
HorizontalAlignment="Center"
VerticalAlignment="Center"
Orientation="Horizontal">
<ToggleButton x:Name="ToggleButton">Click Me</ToggleButton>
</StackPanel>
</Window>
这是因为运行 .NET 时,您生活在一个“托管”世界中,当 .NET 需要时,通常是在垃圾收集器运行时,可以在内存中移动对象。
因此,您必须将传递的对象“固定”到非托管内存,这样它们就不会被移动。最简单的方法是创建一个静态变量,如下所示:
public sealed partial class MainWindow : Window
{
private static WNDPROC wndProc = null!;
private static WNDPROC hp = HotKeyProc;
private static MainWindow _window;
private static LRESULT HotKeyProc(HWND hWnd, uint Msg, WPARAM wParam, LPARAM lParam)
{
uint WM_HOTKEY = 0x0312; // HotKey Window Message
if (Msg == WM_HOTKEY)
{
if (_window.ToggleButton.IsEnabled)
{
_window.ToggleButton.IsChecked = !_window.ToggleButton.IsChecked;
}
}
return PInvoke.CallWindowProc(wndProc, hWnd, Msg, wParam, lParam);
}
public MainWindow()
{
this.InitializeComponent();
_window = this;
// Get window handle
HWND hWnd = new(WinRT.Interop.WindowNative.GetWindowHandle(this));
// Register hotkey
int id = 0x0000;
_ = PInvoke.RegisterHotKey(hWnd, id, HOT_KEY_MODIFIERS.MOD_NOREPEAT, 0x75); // F6
// Add hotkey function pointer to window procedure
nint hotKeyProcPtr = Marshal.GetFunctionPointerForDelegate(hp);
nint wndPtr = PInvoke.SetWindowLongPtr(hWnd, WINDOW_LONG_PTR_INDEX.GWL_WNDPROC, hotKeyProcPtr);
wndProc = Marshal.GetDelegateForFunctionPointer<WNDPROC>(wndPtr);
}
}
这里有一个示例如何为按钮制作全局键盘加速器/热键?它有一些可重用的代码并且工作方式有点不同