如何告诉Windows资源管理器刷新其图标？ [英] How to tell Windows Explorer to refresh its icons?

问题描述

一旦我的安装程序完成安装我的应用程序的exe的新版本，我想告诉资源管理器使用新exe的图标作为其快捷方式。但是，我无法弄清楚如何做到这一点。

Once my installer finishes installing new versions of my application's exe, I'd like to tell Explorer to use the new exe's icons for its shortcuts. However, I cannot figure out how to do this.

从网上看，看起来问题是系统映像列表正在缓存旧版本的图标。我尝试用 SHChangeNotify c $ c> SHCNE_UPDATEIMAGE 参数。我试着打电话给 SHUpdateImage 。我甚至尝试了广播的 sledgehammer方法 WM_SETTINGCHANGE 。似乎没什么用。

From reading online, it looks like the problem is that the system image list is caching an old version of the icon. I tried calling SHChangeNotify with a SHCNE_UPDATEIMAGE parameter. I tried calling SHUpdateImage. I even tried the sledgehammer approach of broadcasting WM_SETTINGCHANGE. Nothing seems to work.

我完全有可能做错了。任何帮助将不胜感激。

It's entirely possible that I'm just doing something wrong. Any help would be appreciated.

警告：非常难看的测试代码如下。

Warning: Very ugly test code follows.

#if 1
    // First attempt: using shell functions
    wchar_t icon_path[MAX_PATH];
    int icon_index;
    UINT icon_flags;

    IShellFolder *desktop_folder;
    IShellFolder *sub_folder;
    IExtractIcon *extract_icon;
    LPITEMIDLIST pidl;

    SHGetDesktopFolder(&desktop_folder);

    wchar_t *folder_path = L"C:\\Documents and Settings\\All Users\\Start Menu\\Programs\\MyCompany\\";
    desktop_folder->ParseDisplayName(NULL, NULL, folder_path, NULL, &pidl,
        NULL);
    desktop_folder->BindToObject(pidl, NULL, IID_IShellFolder,
        (void**) &sub_folder);
    sub_folder->ParseDisplayName(NULL, NULL, L"MyApp.lnk", NULL, &pidl,
        NULL);

    sub_folder->GetUIObjectOf(NULL, 1, (LPCITEMIDLIST*) &pidl,
        IID_IExtractIcon, NULL, (void**) &extract_icon);

    extract_icon->GetIconLocation(0, icon_path, MAX_PATH,
        &icon_index, &icon_flags);

    SHFILEINFO sfi;
    DWORD_PTR result = SHGetFileInfo(shortcut_path, 0, &sfi, sizeof(sfi), 
        SHGFI_SYSICONINDEX | SHGFI_LARGEICON);
    SHUpdateImage(icon_path, icon_index, icon_flags, sfi.iIcon);
    // sfi.iIcon should be correct, but we'll try both, just for fun...
    SHChangeNotify(SHCNE_UPDATEIMAGE, SHCNF_DWORD, NULL,
        (LPCVOID) icon_index);
    SHChangeNotify(SHCNE_UPDATEIMAGE, SHCNF_DWORD, NULL,
        (LPCVOID) sfi.iIcon);
#else
    // Second attempt: broadcasting a settings change
    HKEY reg;
    RegCreateKeyEx(HKEY_CURRENT_USER,
        L"Control Panel\\Desktop\\WindowMetrics", 0, NULL, 0,
        KEY_SET_VALUE, NULL, &reg, NULL);
    DWORD value;
    value = 33;
    RegSetValueEx(reg, L"Shell Icon Size", 0, REG_DWORD, (BYTE*) &value,
        sizeof(value));
    value = 32;
    SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS,
        (int) L"WindowMetrics");
    RegSetValueEx(reg, L"Shell Icon Size", 0, REG_DWORD, (BYTE*) &value,
        sizeof(value));
    SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS,
        (int) L"WindowMetrics");
#endif

推荐答案

你的大锤方法是我见过用来完成这项任务的人。但是代码中的oops，Shell Icon Size值是 REG_SZ ，而不是 REG_DWORD 。始终VERIFY（）API函数返回值...

Your sledge-hammer approach is the one I've seen used to get this done. An oops in your code though, the "Shell Icon Size" value is a REG_SZ, not a REG_DWORD. Always VERIFY() the API function return values...

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