WPF 应用程序中的 Windows 7 任务栏 SetOverlayIcon 不起作用

Question

我正在尝试使用 Windows 7 任务栏 API 来设置任务栏上应用程序图标的覆盖图标。

我从 Microsoft 下载了示例，但想提取执行此操作的特定代码片段，以避免添加对我不会使用的大部分代码的引用。

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

我的 Window1.xaml 的代码隐藏是这样的：

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，什么也没有发生。没有错误。图标不变。

我想知道我是否将正确的句柄传递给 SetOverlayIcon 方法。

有人知道如何解决这个问题吗？

Answer 1

您的 ITaskBarList3 接口错误。这是正确的：

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);
}