WPF 应用程序中的 Windows 7 任务栏 SetOverlayIcon 不起作用 [英] Windows 7 Taskbar SetOverlayIcon from WPF app doesn't work

问题描述

我正在尝试使用 Windows 7 任务栏 API 在任务栏上设置应用程序图标的覆盖图标.

I'm trying to use the Windows 7 Taskbar API to set the overlay icon of the application icon on the taskbar.

我已经从 Microsoft 下载了示例，但想提取执行此操作的特定代码段，以避免添加对大量我不会使用的大部分代码的引用.

I've downloaded the samples from Microsoft, but wanted to extract that particular piece of code that does that to avoid adding a reference to a huge brick of code that I won't use most of.

我在 Win 7 x64 上的 VS 2010 中有一个简单的 WPF 应用程序.

I have a simple WPF app in VS 2010 on Win 7 x64.

我的 Window1.xaml 的代码隐藏是这样的:

Code-behind for my Window1.xaml is like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Windows.Interop;

namespace WpfApplication1
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
    }

    private static ITaskbarList3 _taskbarList;
    internal static ITaskbarList3 TaskbarList
    {
        get
        {
            if (_taskbarList == null)
            {
                if (_taskbarList == null)
                {
                    _taskbarList = (ITaskbarList3)new CTaskbarList();
                    _taskbarList.HrInit();
                }
            }
            return _taskbarList;
        }
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        TaskbarList.SetOverlayIcon(new WindowInteropHelper(Application.Current.MainWindow).Handle, SystemIcons.Question.Handle, "Test");
    }
}

[ComImportAttribute()]
[GuidAttribute("ea1afb91-9e28-4b86-90e9-9e9f8a5eefaf")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
internal interface ITaskbarList3
{
    // ITaskbarList
    [PreserveSig]
    void HrInit();
    [PreserveSig]
    void AddTab(IntPtr hwnd);
    [PreserveSig]
    void DeleteTab(IntPtr hwnd);
    [PreserveSig]
    void ActivateTab(IntPtr hwnd);
    [PreserveSig]
    void SetActiveAlt(IntPtr hwnd);

    void SetOverlayIcon(
        IntPtr hwnd,
        IntPtr hIcon,
        [MarshalAs(UnmanagedType.LPWStr)] string pszDescription);
}

[GuidAttribute("56FDF344-FD6D-11d0-958A-006097C9A090")]
[ClassInterfaceAttribute(ClassInterfaceType.None)]
[ComImportAttribute()]
internal class CTaskbarList { }
  }

当我点击按钮时，没有任何反应.没有错误.图标不会改变.

When I click the button, nothing happens. No error. Icon doesn't change.

我想知道我是否将正确的句柄传递给 SetOverlayIcon 方法.

I wonder if I'm passing the correct handle to the SetOverlayIcon method.

有人知道如何解决这个问题吗?

Anyone know how to fix this?

推荐答案

您的 ITaskBarList3 接口错误.这是正确的:

Your ITaskBarList3 interface is wrong. Here the correct one:

public enum TBPF
{
    TBPF_NOPROGRESS = 0,
    TBPF_INDETERMINATE = 0x1,
    TBPF_NORMAL = 0x2,
    TBPF_ERROR = 0x4,
    TBPF_PAUSED = 0x8
}

public enum TBATF
{
    TBATF_USEMDITHUMBNAIL = 0x1,
    TBATF_USEMDILIVEPREVIEW = 0x2
}

public enum THB : uint
{
    THB_BITMAP = 0x1,
    THB_ICON = 0x2,
    THB_TOOLTIP = 0x4,
    THB_FLAGS = 0x8
}

public enum THBF : uint
{
    THBF_ENABLED = 0,
    THBF_DISABLED = 0x1,
    THBF_DISMISSONCLICK = 0x2,
    THBF_NOBACKGROUND = 0x4,
    THBF_HIDDEN = 0x8
}

[StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Auto)]
public struct THUMBBUTTON
{
    public THB dwMask;
    public uint iId;
    public uint iBitmap;
    public IntPtr hIcon;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = Windows.MAX_PATH)]
    public string szTip;
    public THBF dwFlags;
}

[ComImport]
[Guid("ea1afb91-9e28-4b86-90e9-9e9f8a5eefaf")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface ITaskbarList3
{
    // ITaskbarList
    void HrInit();
    void AddTab(IntPtr hwnd);
    void DeleteTab(IntPtr hwnd);
    void ActivateTab(IntPtr hwnd);
    void SetActiveAlt(IntPtr hwnd);

    // ITaskbarList2
    void MarkFullscreenWindow(
        IntPtr hwnd,
        [MarshalAs(UnmanagedType.Bool)] bool fFullscreen);

    // ITaskbarList3
    void SetProgressValue(IntPtr hwnd, ulong ullCompleted, ulong ullTotal);
    void SetProgressState(IntPtr hwnd, TBPF tbpFlags);
    void RegisterTab(IntPtr hwndTab, IntPtr hwndMDI);
    void UnregisterTab(IntPtr hwndTab);
    void SetTabOrder(IntPtr hwndTab, IntPtr hwndInsertBefore);
    void SetTabActive(IntPtr hwndTab, IntPtr hwndMDI, TBATF tbatFlags);

    void ThumbBarAddButtons(
        IntPtr hwnd,
        uint cButtons,
        [MarshalAs(UnmanagedType.LPArray)] THUMBBUTTON[] pButtons);

    void ThumbBarUpdateButtons(
        IntPtr hwnd,
        uint cButtons,
        [MarshalAs(UnmanagedType.LPArray)] THUMBBUTTON[] pButtons);

    void ThumbBarSetImageList(IntPtr hwnd, IntPtr himl);

    void SetOverlayIcon(
        IntPtr hwnd,
        IntPtr hIcon,
        [MarshalAs(UnmanagedType.LPWStr)] string pszDescription);

    void SetThumbnailTooltip(
        IntPtr hwnd,
        [MarshalAs(UnmanagedType.LPWStr)] string pszTip);

    void SetThumbnailClip(
        IntPtr hwnd,
        [MarshalAs(UnmanagedType.LPStruct)] Rectangle prcClip);
}

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