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Diffstat (limited to 'zen/notify_removal.cpp')
| -rw-r--r-- | zen/notify_removal.cpp | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/zen/notify_removal.cpp b/zen/notify_removal.cpp new file mode 100644 index 00000000..805c1c09 --- /dev/null +++ b/zen/notify_removal.cpp @@ -0,0 +1,236 @@ +// ************************************************************************** +// * This file is part of the FreeFileSync project. It is distributed under * +// * GNU General Public License: http://www.gnu.org/licenses/gpl.html * +// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de) * +// ************************************************************************** + +#include "notify_removal.h" +#include <set> +#include <algorithm> +#include <dbt.h> +#include "scope_guard.h" + +using namespace zen; + +/* +//convert bitmask into "real" drive-letter +Zstring getDriveFromMask(ULONG unitmask) +{ + for (int i = 0; i < 26; ++i) + { + if (unitmask & 0x1) + return Zstring() + static_cast<DefaultChar>(DefaultChar('A') + i) + DefaultStr(":\\"); + unitmask >>= 1; + } + return Zstring(); +} +*/ + +namespace +{ +bool messageProviderConstructed = false; +} + + +class MessageProvider //administrates a single dummy window to receive messages +{ +public: + static MessageProvider& instance() //throw (FileError) + { + static MessageProvider inst; + messageProviderConstructed = true; + return inst; + } + + class Listener + { + public: + virtual ~Listener() {} + virtual void onMessage(UINT message, WPARAM wParam, LPARAM lParam) = 0; //throw()! + }; + void registerListener(Listener& l) { listener.insert(&l); } + void unregisterListener(Listener& l) { listener.erase(&l); } //don't unregister objects with static lifetime + + HWND getWnd() const { return windowHandle; } //get handle in order to register additional notifications + +private: + MessageProvider(); + ~MessageProvider(); + MessageProvider(const MessageProvider&); + MessageProvider& operator=(const MessageProvider&); + + static const wchar_t WINDOW_NAME[]; + + friend LRESULT CALLBACK topWndProc(HWND, UINT, WPARAM, LPARAM); + void processMessage(UINT message, WPARAM wParam, LPARAM lParam); + + const HINSTANCE process; + HWND windowHandle; + + std::set<Listener*> listener; +}; + + +const wchar_t MessageProvider::WINDOW_NAME[] = L"E6AD5EB1-527B-4EEF-AC75-27883B233380"; //random name + + +LRESULT CALLBACK topWndProc( + HWND hwnd, //handle to window + UINT uMsg, //message identifier + WPARAM wParam, //first message parameter + LPARAM lParam) //second message parameter +{ + if (messageProviderConstructed) //attention: this callback is triggered in the middle of singleton construction! It is a bad idea to to call back at this time! + try + { + MessageProvider::instance().processMessage(uMsg, wParam, lParam); //not supposed to throw + } + catch (...) {} + + return ::DefWindowProc(hwnd, uMsg, wParam, lParam); +} + + +MessageProvider::MessageProvider() : + process(::GetModuleHandle(NULL)), //get program's module handle + windowHandle(NULL) +{ + if (process == NULL) + throw zen::FileError(std::wstring(L"Could not start monitoring window notifications:") + "\n\n" + getLastErrorFormatted() + " (GetModuleHandle)"); + + //register the main window class + WNDCLASS wc = {}; + wc.lpfnWndProc = topWndProc; + wc.hInstance = process; + wc.lpszClassName = WINDOW_NAME; + + if (::RegisterClass(&wc) == 0) + throw zen::FileError(std::wstring(L"Could not start monitoring window notifications:") + "\n\n" + getLastErrorFormatted() + " (RegisterClass)"); + + zen::ScopeGuard guardClass = zen::makeGuard([&]() { ::UnregisterClass(WINDOW_NAME, process); }); + + //create dummy-window + windowHandle = ::CreateWindow( + WINDOW_NAME, //LPCTSTR lpClassName OR ATOM in low-order word! + NULL, //LPCTSTR lpWindowName, + 0, //DWORD dwStyle, + 0, //int x, + 0, //int y, + 0, //int nWidth, + 0, //int nHeight, + 0, //note: we need a toplevel window to receive device arrival events, not a message-window (HWND_MESSAGE)! + NULL, //HMENU hMenu, + process, //HINSTANCE hInstance, + NULL); //LPVOID lpParam + if (windowHandle == NULL) + throw zen::FileError(std::wstring(L"Could not start monitoring window notifications:") + "\n\n" + getLastErrorFormatted() + " (CreateWindow)"); + + guardClass.dismiss(); +} + + +MessageProvider::~MessageProvider() +{ + //clean-up in reverse order + ::DestroyWindow(windowHandle); + ::UnregisterClass(WINDOW_NAME, //LPCTSTR lpClassName OR ATOM in low-order word! + process); //HINSTANCE hInstance +} + + +void MessageProvider::processMessage(UINT message, WPARAM wParam, LPARAM lParam) +{ + std::for_each(listener.begin(), listener.end(), + [&](Listener* ls) { ls->onMessage(message, wParam, lParam); }); +} +//#################################################################################################### + + +class NotifyRequestDeviceRemoval::Pimpl : private MessageProvider::Listener +{ +public: + Pimpl(NotifyRequestDeviceRemoval& parent, HANDLE hDir) : //throw (FileError) + parent_(parent) + { + MessageProvider::instance().registerListener(*this); //throw (FileError) + + //register handles to receive notifications + DEV_BROADCAST_HANDLE filter = {}; + filter.dbch_size = sizeof(filter); + filter.dbch_devicetype = DBT_DEVTYP_HANDLE; + filter.dbch_handle = hDir; + + hNotification = ::RegisterDeviceNotification( + MessageProvider::instance().getWnd(), //__in HANDLE hRecipient, + &filter, //__in LPVOID NotificationFilter, + DEVICE_NOTIFY_WINDOW_HANDLE); //__in DWORD Flags + if (hNotification == NULL) + { + const DWORD lastError = ::GetLastError(); + if (lastError != ERROR_CALL_NOT_IMPLEMENTED && //fail on SAMBA share: this shouldn't be a showstopper! + lastError != ERROR_SERVICE_SPECIFIC_ERROR && //neither should be fail for "Pogoplug" mapped network drives + lastError != ERROR_INVALID_DATA) //this seems to happen for a NetDrive-mapped FTP server + throw zen::FileError(std::wstring(L"Could not register device removal notifications:") + "\n\n" + getLastErrorFormatted(lastError)); + } + } + + ~Pimpl() + { + ::UnregisterDeviceNotification(hNotification); + MessageProvider::instance().unregisterListener(*this); + } + +private: + Pimpl(Pimpl&); + Pimpl& operator=(Pimpl&); + + virtual void onMessage(UINT message, WPARAM wParam, LPARAM lParam) //throw()! + { + //DBT_DEVICEQUERYREMOVE example: http://msdn.microsoft.com/en-us/library/aa363427(v=VS.85).aspx + if (message == WM_DEVICECHANGE) + { + if ( wParam == DBT_DEVICEQUERYREMOVE || + wParam == DBT_DEVICEQUERYREMOVEFAILED || + wParam == DBT_DEVICEREMOVECOMPLETE) + { + PDEV_BROADCAST_HDR header = reinterpret_cast<PDEV_BROADCAST_HDR>(lParam); + if (header->dbch_devicetype == DBT_DEVTYP_HANDLE) + { + PDEV_BROADCAST_HANDLE body = reinterpret_cast<PDEV_BROADCAST_HANDLE>(lParam); + +#ifdef __MINGW32__ + const HDEVNOTIFY requestNotification = reinterpret_cast<HDEVNOTIFY>(body->dbch_hdevnotify); +#else + const HDEVNOTIFY requestNotification = body->dbch_hdevnotify; +#endif + if (requestNotification == hNotification) //is it for the notification we registered? + switch (wParam) + { + case DBT_DEVICEQUERYREMOVE: + parent_.onRequestRemoval(body->dbch_handle); + break; + case DBT_DEVICEQUERYREMOVEFAILED: + parent_.onRemovalFinished(body->dbch_handle, false); + break; + case DBT_DEVICEREMOVECOMPLETE: + parent_.onRemovalFinished(body->dbch_handle, true); + break; + } + } + } + } + } + + NotifyRequestDeviceRemoval& parent_; + HDEVNOTIFY hNotification; +}; +//#################################################################################################### + + +NotifyRequestDeviceRemoval::NotifyRequestDeviceRemoval(HANDLE hDir) +{ + pimpl.reset(new Pimpl(*this, hDir)); +} + + +NotifyRequestDeviceRemoval::~NotifyRequestDeviceRemoval() {} //make sure ~auto_ptr() works with complete type |