问题
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.
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.
It's entirely possible that I'm just doing something wrong. Any help would be appreciated.
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, ®, 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
回答1:
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...
来源:https://stackoverflow.com/questions/1757737/how-to-tell-windows-explorer-to-refresh-its-icons