c - 如何告诉 Windows 资源管理器刷新其图标？

Question

一旦我的安装程序完成安装我的应用程序 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。

从网上看，问题是system image list正在缓存旧版本的图标。我试着打电话 SHChangeNotify与 SHCNE_UPDATEIMAGE范围。我试着打电话 SHUpdateImage .我什至尝试了 sledgehammer approach广播WM_SETTINGCHANGE .似乎没有任何效果。

我完全有可能只是做错了什么。任何帮助，将不胜感激。

警告:非常丑陋的测试代码如下。

#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

Answer 1

你的大锤方法是我见过的用来完成这项工作的方法。但是，在您的代码中，“ shell 图标大小”值是 REG_SZ ，不是 REG_DWORD .始终 VERIFY() API 函数返回值...