如何使WPF应用程序在aero peek中可见

本文关键字：peek aero 何使 WPF 应用程序 | 更新日期: 2023-09-27 18:01:21

我已经在WPF中开发了一个应用程序，现在它已经完成了99%，我想实现的最后一件事是应用程序即使在显示桌面和aero peek中也能保持可见，就像Windows 7中的小工具一样。我知道Stack Overflow中也有类似的问题，但在我的Windows 10 64位操作系统中没有一个问题。该应用程序采用32位处理器架构。请帮助我提供详细的答案和在Windows 10 64位工作的代码。我使用的语言是c#

如何使WPF应用程序在aero peek中可见

只需调用StayVisible函数，您的窗口将保持可见，即使在AeroPeek模式

大部分代码来自这里。

    public void StayVisible() {
        var helper = new WindowInteropHelper(this);
        helper.EnsureHandle();
        if (!DwmIsCompositionEnabled()) return;
        var status = Marshal.AllocCoTaskMem(sizeof(uint));
        Marshal.Copy(new[] {(int) DwmncRenderingPolicy.DWMNCRP_ENABLED}, 0, status, 1);
        DwmSetWindowAttribute(helper.Handle,
            DwmWindowAttribute.DWMWA_EXCLUDED_FROM_PEEK,
            status,
            sizeof(uint));
    }
    [DllImport("dwmapi.dll", PreserveSig = false)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool DwmIsCompositionEnabled();
    [DllImport("dwmapi.dll", PreserveSig = true)]
    private static extern int DwmSetWindowAttribute(IntPtr hwnd,
        DwmWindowAttribute dwmAttribute,
        IntPtr pvAttribute,
        uint cbAttribute);
    [Flags]
    private enum DwmWindowAttribute : uint {
        DWMWA_NCRENDERING_ENABLED = 1,
        DWMWA_NCRENDERING_POLICY,
        DWMWA_TRANSITIONS_FORCEDISABLED,
        DWMWA_ALLOW_NCPAINT,
        DWMWA_CAPTION_BUTTON_BOUNDS,
        DWMWA_NONCLIENT_RTL_LAYOUT,
        DWMWA_FORCE_ICONIC_REPRESENTATION,
        DWMWA_FLIP3D_POLICY,
        DWMWA_EXTENDED_FRAME_BOUNDS,
        DWMWA_HAS_ICONIC_BITMAP,
        DWMWA_DISALLOW_PEEK,
        DWMWA_EXCLUDED_FROM_PEEK,
        DWMWA_LAST
    }
    private enum DwmncRenderingPolicy {
        DWMNCRP_USEWINDOWSTYLE,
        DWMNCRP_DISABLED,
        DWMNCRP_ENABLED,
        DWMNCRP_LAST
    }
更新。net 3.5

如果你正在使用。net 3.5，你需要一个小的扩展方法来使EnsureHandle方法可用。或者你把。net升级到4.0——就看你了。

I found it here

using System;
using System.Reflection;
using System.Windows;
using System.Windows.Interop;
/// Provides NetFX 4.0 EnsureHandle method for
/// NetFX 3.5 WindowInteropHelper class.
public static class WindowInteropHelperExtensions {
    public static IntPtr EnsureHandle(this WindowInteropHelper helper) {
        if (helper == null) throw new ArgumentNullException("helper");
        if (helper.Handle != IntPtr.Zero) return helper.Handle;
        var window = (Window) typeof(WindowInteropHelper).InvokeMember("_window",
            BindingFlags.GetField | BindingFlags.Instance | BindingFlags.NonPublic,
            null, helper, null);
        typeof(Window).InvokeMember("SafeCreateWindow",
            BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.NonPublic,
            null, window, null);
        return helper.Handle;
    }
}
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