c++ - 给定 KNOWNFOLDERID 或其 GUID 获取 Windows 下的关联图标

Question

寻找一种使用 C++ 获取与桌面快捷方式关联的图标的方法，当我只有它的 GUID 时 - 类似于 {82A74AEB-AEB4-465C-A014-D097EE346D63} 或其 KNOWNFOLDERID

Answer 1

像这样的东西，基于 IShellItemImageFactory自 Windows Vista 以来存在的界面:

CoInitialize(NULL);
{
    CComPtr<IKnownFolderManager> mgr;
    if (SUCCEEDED(mgr.CoCreateInstance(CLSID_KnownFolderManager)))
    {
        CComPtr<IKnownFolder> folder;
        if (SUCCEEDED(mgr->GetFolder(FOLDERID_ControlPanelFolder, &folder)))
        {
            CComHeapPtr<ITEMIDLIST> pidl;
            // I pass 0 for flags here, but mileage may differ
            if (SUCCEEDED(folder->GetIDList(0, &pidl)))
            {
                CComPtr<IShellItemImageFactory> factory;
                if (SUCCEEDED(SHCreateItemFromIDList(pidl, IID_PPV_ARGS(&factory))))
                {
                    // you can vary size and SIIGBF flags
                    HBITMAP bmp = nullptr;
                    SIZE size = { 256, 256 };
                    if (SUCCEEDED(factory->GetImage(size, SIIGBF_ICONONLY, &bmp)))
                    {
                        // etc...
                        DeleteObject(bmp);
                    }
                }
            }
        }
    }
}
CoUninitialize();

还有更好的方法使用 SHCreateItemInKnownFolder function :

CoInitialize(NULL);
{
    CComPtr<IShellItemImageFactory> factory;
    if (SUCCEEDED(SHCreateItemInKnownFolder(FOLDERID_ControlPanelFolder, 0, NULL, IID_PPV_ARGS(&factory))))
    {
        // you can vary size and SIIGBF flags
        HBITMAP bmp = nullptr;
        SIZE size = { 256, 256 };
        if (SUCCEEDED(factory->GetImage(size, SIIGBF_ICONONLY, &bmp)))
        {
            // etc...
            DeleteObject(bmp);
        }
    }
}
CoUninitialize();

请注意，这将使您将图标作为 HBITMAP。