以编程方式更改和刷新图标（无需重新启动）

Question

当我手动替换图标时（即不是从资源管理器中的文件夹选项窗口），图标不会被更新。例如，如果我执行这个批处理代码：

REG ADD HKCR\testfile\DefaultIcon /ve /d "C:\test.ico,0" /f

图标在“文件夹选项”的列表中显示为应有的样子，但图标未在桌面或资源管理器中更新。

如果我只是点击任何文件类型的“更改图标”按钮并退出“文件夹选项”窗口，图标就会更新。但据我所知，这不能通过批处理或 VBS 来完成。

重新启动 explorer.exe 确实有效，但如果我这样做，任务栏中的应用程序选项卡会由于某种原因出现错误（例如：当应用程序最大化时，我不能只左键单击任务栏中的选项卡再最小化它 - 我实际上必须右键单击它并点击最小化......）。更何况，如果我这样做，所有打开的资源管理器窗口都会关闭，这有点麻烦。

我还有一份 TuneUp Utilities 的副本，它有一个重新加载图标缓存的选项，这确实像预期的那样工作。但再一次，我无法通过批处理或 VBS 访问此工具。它不会重新启动 explorer.exe 或删除任何文件（就像某些解决方案一样）。我对此持肯定态度，因为我的操作系统驱动器上任何地方都没有 iconcache.db 文件。

我也尝试通过 VBS 添加注册表项，但没有帮助。

欢迎任何批处理或 VBScript 解决方案！

Answer 1

通过关联文件，系统会刷新图标，所以我的简单解决方案是这样的：

ASSOC .anyextension=anytype
ASSOC .anyextension=

第二行取消与扩展的关联。

Answer 2

This page 有一个重建缓存的 VB 程序（查看 frmRebuiltIconCache.frm 以获取实际代码）

它的作用是检查HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size 的值，从中减去1，通过SendMessageTimeout 强制超时，然后重置该值，并重复超时

由于您无法从 vbs（没有外部程序）调用 DLL，这可能无法满足您的需求。我已将程序缩减为：

'SendMessageTimeout values
Const HWND_BROADCAST = &HFFFF
Const WM_SETTINGCHANGE = &H1A
Const SPI_SETNONCLIENTMETRICS = &H2A
Const SMTO_ABORTIFHUNG = &H2

'Private Declare Function SendMessageTimeout Lib "user32" Alias "SendMessageTimeoutA" _
'  (ByVal hwnd As Long, ByVal msg As Long, _
'  ByVal wParam As Long, ByVal lParam As Long, _
'  ByVal fuFlags As Long, ByVal uTimeout As Long, _
'  lpdwResult As Long) As Long

Dim icon_size
Dim new_icon_size
Dim result
Dim SysVarReg
Set SysVarReg = WScript.CreateObject("WScript.Shell")
    ' Get the current icon size.
icon_size = SysVarReg.RegRead ("HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size")
    ' Increase the value by 1.
new_icon_size = CInt(icon_size) + 1
SysVarReg.RegWrite "HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size", new_icon_size
    ' Send HWND_BROADCAST to refresh the icons.
SendMessageTimeout HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0, SMTO_ABORTIFHUNG, 10000, result
    ' Restore the original value.
SysVarReg.RegWrite "HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size", icon_size
    ' Send HWND_BROADCAST to refresh the icons again.
SendMessageTimeout HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0, SMTO_ABORTIFHUNG, 10000, result

但如果没有东西来包装 DLL 调用，您将无法通过 vbs 执行此操作

Answer 3

' It work in XP.

' The following is "VBA" Module.

' ---------------------------------------------------------

'SendMessageTimeout values
Const HWND_BROADCAST = &HFFFF
Const WM_SETTINGCHANGE = &H1A
Const SPI_SETNONCLIENTMETRICS = &H2A
Const SMTO_ABORTIFHUNG = &H2

Private Declare Function SendMessageTimeout Lib "user32" Alias "SendMessageTimeoutA" _
  (ByVal hwnd As Long, ByVal msg As Long, _
  ByVal wParam As Long, ByVal lParam As Long, _
  ByVal fuFlags As Long, ByVal uTimeout As Long, _
  lpdwResult As Long) As Long


Sub Rebuild_Icon_cache()

Dim icon_size
Dim new_icon_size
Dim result
Dim SysVarReg

Set SysVarReg = CreateObject("WScript.Shell")

' Get the current icon size.
icon_size = SysVarReg.RegRead("HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size")

' Increase the value by 1.
new_icon_size = CInt(icon_size) + 1
SysVarReg.RegWrite "HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size", new_icon_size

' Send HWND_BROADCAST to refresh the icons.
SendMessageTimeout HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0, SMTO_ABORTIFHUNG, 10000, result

' Restore the original value.
SysVarReg.RegWrite "HKCU\Control Panel\Desktop\WindowMetrics\Shell Icon Size", icon_size

' Send HWND_BROADCAST to refresh the icons again.
SendMessageTimeout HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0, SMTO_ABORTIFHUNG, 10000, result

End Sub