我正在编写一个小型应用程序,它将允许用户弹出(或安全地删除)USB驱动器。我的应用程序运行正常,但在Windows资源管理器中打开USB驱动器上的文件夹(或几个文件夹)的情况除外。在这种情况下,弹出驱动器将失败,因为驱动器似乎已被锁定。
因此,我很好奇,因为用户正在通过我的应用发出命令以弹出USB驱动器,是否有任何方法可以使资源管理器从USB驱动器关闭那些打开的窗口?
PS。请注意,我不想关闭所有属于Windows资源管理器的进程,而是只关闭那些在特定驱动器上打开文件夹的进程。
procedure ProcessExplorerWindows(ADriveLetter: WideChar; AClose: Boolean);
var
ShellWindows: IShellWindows;
i: Integer;
Dispatch: IDispatch;
WebBrowser2: IWebBrowser2;
ServiceProvider: IServiceProvider;
ShellBrowser: IShellBrowser;
ShellView: IShellView;
FolderView: IFolderView;
PersistFolder2: IPersistFolder2;
ItemIDList: PItemIDList;
ShellFolder: IShellFolder;
ChildItem: PItemIDList;
Attr: DWORD;
StrRet: TStrRet;
FileName: UnicodeString;
DesktopItemIDList: PItemIDList;
begin
OleCheck(CoCreateInstance(CLASS_ShellWindows, nil, CLSCTX_INPROC_SERVER or CLSCTX_LOCAL_SERVER, IShellWindows, ShellWindows));
try
for i := ShellWindows.Count - 1 downto 0 do
begin
Dispatch := ShellWindows.Item(i);
try
OleCheck(Dispatch.QueryInterface(IWebBrowser2, WebBrowser2));
try
OleCheck(Dispatch.QueryInterface(IServiceProvider, ServiceProvider));
try
OleCheck(ServiceProvider.QueryService(SID_STopLevelBrowser, IShellBrowser, ShellBrowser));
try
OleCheck(ShellBrowser.QueryActiveShellView(ShellView));
try
OleCheck(ShellView.QueryInterface(IFolderView, FolderView));
try
OleCheck(FolderView.GetFolder(IPersistFolder2, PersistFolder2));
try
OleCheck(PersistFolder2.GetCurFolder(ItemIDList));
try
OleCheck(SHBindToParent(ItemIDList, IShellFolder, Pointer(ShellFolder), ChildItem));
try
Attr := SFGAO_FILESYSTEM;
OleCheck(ShellFolder.GetAttributesOf(1, ChildItem, Attr));
if Attr and SFGAO_FILESYSTEM = SFGAO_FILESYSTEM then
begin
OleCheck(ShellFolder.GetDisplayNameOf(ChildItem, SHGDN_FORPARSING, StrRet));
FileName := '';
case StrRet.uType of
STRRET_WSTR:
begin
FileName := StrRet.pOleStr;
CoTaskMemFree(StrRet.pOleStr);
end;
STRRET_OFFSET:
if Assigned(ChildItem) then
begin
Inc(PByte(ChildItem), StrRet.uOffset);
FileName := UnicodeString(PAnsiChar(ChildItem));
end;
STRRET_CSTR:
FileName := UnicodeString(AnsiString(StrRet.cStr));
end;
if ExtractFileDrive(FileName) = ADriveLetter + ':' then
if AClose then
WebBrowser2.Quit
else
begin
SHGetFolderLocation(0, CSIDL_DESKTOP, 0, 0, DesktopItemIDList);
try
OleCheck(ShellBrowser.BrowseObject(DesktopItemIDList, SBSP_SAMEBROWSER or SBSP_DEFMODE or SBSP_ABSOLUTE));
finally
CoTaskMemFree(DesktopItemIDList);
end;
end;
end;
finally
ShellFolder := nil;
end;
finally
CoTaskMemFree(ItemIDList);
end;
finally
PersistFolder2 := nil
end;
finally
FolderView := nil;
end;
finally
ShellView := nil;
end;
finally
ShellBrowser := nil;
end;
finally
ServiceProvider := nil;
end;
finally
WebBrowser2 := nil;
end;
finally
Dispatch := nil;
end;
end;
finally
ShellWindows := nil;
end;
end;
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