3.9

1 files changed, 268 insertions, 0 deletions

diff --git a/RealtimeSync/notify.cpp b/RealtimeSync/notify.cpp
new file mode 100644
index 00000000..fc9ac8cc
--- /dev/null
+++ b/RealtimeSync/notify.cpp
@@ -0,0 +1,268 @@
+// **************************************************************************
+// * 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) 2008-2010 ZenJu (zhnmju123 AT gmx.de)                    *
+// **************************************************************************
+//
+#include "notify.h"
+#include <set>
+#include "../shared/system_func.h"
+#include "../shared/Loki/ScopeGuard.h"
+#include <algorithm>
+#include <boost/bind.hpp>
+#include <dbt.h>
+
+using namespace ffs3;
+
+
+/*
+//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);
+    void unregisterListener(Listener& l); //don't unregister objects with static lifetime
+
+    HWND getWnd() const; //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 ffs3::FileError(wxString(wxT("Could not start monitoring window notifications:")) + wxT("\n\n") +
+                              ffs3::getLastErrorFormatted() + wxT(" (GetModuleHandle)"));
+
+    //register the main window class
+    WNDCLASS wc = {};
+    wc.lpfnWndProc   = topWndProc;
+    wc.hInstance     = process;
+    wc.lpszClassName = WINDOW_NAME;
+
+    if (::RegisterClass(&wc) == 0)
+        throw ffs3::FileError(wxString(wxT("Could not start monitoring window notifications:")) + wxT("\n\n") +
+                              ffs3::getLastErrorFormatted() + wxT(" (RegisterClass)"));
+
+    Loki::ScopeGuard guardClass = Loki::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 ffs3::FileError(wxString(wxT("Could not start monitoring window notifications:")) + wxT("\n\n") +
+                              ffs3::getLastErrorFormatted() + wxT(" (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
+}
+
+
+inline
+void MessageProvider::registerListener(Listener& l)
+{
+    listener.insert(&l);
+}
+
+
+inline
+void MessageProvider::unregisterListener(Listener& l) //don't unregister objects with static lifetime
+{
+    listener.erase(&l);
+}
+
+
+inline
+HWND MessageProvider::getWnd() const //get handle in order to register additional notifications
+{
+    return windowHandle;
+}
+
+
+void MessageProvider::processMessage(UINT message, WPARAM wParam, LPARAM lParam)
+{
+    std::for_each(listener.begin(), listener.end(), boost::bind(&Listener::onMessage, _1, message, wParam, lParam));
+}
+//####################################################################################################
+
+
+class NotifyRequestDeviceRemoval::Pimpl : private MessageProvider::Listener
+{
+public:
+    Pimpl(NotifyRequestDeviceRemoval& parent, const std::vector<HANDLE>& openHandles) : //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;
+
+        try
+        {
+            for (std::vector<HANDLE>::const_iterator i = openHandles.begin(); i != openHandles.end(); ++i)
+            {
+                filter.dbch_handle = *i;
+
+                HDEVNOTIFY hNotfication = ::RegisterDeviceNotification(
+                                              MessageProvider::instance().getWnd(), //__in  HANDLE hRecipient,
+                                              &filter,                              //__in  LPVOID NotificationFilter,
+                                              DEVICE_NOTIFY_WINDOW_HANDLE);         //__in  DWORD Flags
+                if (hNotfication == NULL)
+                    throw ffs3::FileError(wxString(wxT("Could not register device removal notifications:")) + wxT("\n\n") + ffs3::getLastErrorFormatted());
+
+                notifications.insert(hNotfication);
+            }
+        }
+        catch (...)
+        {
+            std::for_each(notifications.begin(), notifications.end(), ::UnregisterDeviceNotification);
+            MessageProvider::instance().unregisterListener(*this); //throw() in this case
+            throw;
+        }
+    }
+
+    ~Pimpl()
+    {
+        std::for_each(notifications.begin(), notifications.end(), ::UnregisterDeviceNotification);
+        MessageProvider::instance().unregisterListener(*this);
+    }
+
+private:
+    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 (notifications.find(requestNotification) != notifications.end()) //is it for one of our notifications 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_;
+    std::set<HDEVNOTIFY> notifications;
+};
+//####################################################################################################
+
+
+NotifyRequestDeviceRemoval::NotifyRequestDeviceRemoval(const std::vector<HANDLE>& openHandles)
+{
+    pimpl.reset(new Pimpl(*this, openHandles));
+}
+
+
+NotifyRequestDeviceRemoval::~NotifyRequestDeviceRemoval() {} //make sure ~auto_ptr() works with complete type