winshutdownmonitor.cpp

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// Copyright (c) 2014-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include <qt/winshutdownmonitor.h>
 
#if defined(Q_OS_WIN)
 
#include <windows.h>
 
#include <QDebug>
 
// If we don't want a message to be processed by Qt, return true and set result to
// the value that the window procedure should return. Otherwise return false.
bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pMessage, long *pnResult)
{
       Q_UNUSED(eventType);
 
       MSG *pMsg = static_cast<MSG *>(pMessage);
 
       switch(pMsg->message)
       {
           case WM_QUERYENDSESSION:
           {
               // Initiate a client shutdown after receiving a WM_QUERYENDSESSION and block
               // Windows session end until we have finished client shutdown.
               m_shutdown_fn();
               *pnResult = FALSE;
               return true;
           }
 
           case WM_ENDSESSION:
           {
               *pnResult = FALSE;
               return true;
           }
       }
 
       return false;
}
 
void WinShutdownMonitor::registerShutdownBlockReason(const QString& strReason, const HWND& mainWinId)
{
    typedef BOOL (WINAPI *PSHUTDOWNBRCREATE)(HWND, LPCWSTR);
    PSHUTDOWNBRCREATE shutdownBRCreate = (PSHUTDOWNBRCREATE)(void*)GetProcAddress(GetModuleHandleA("User32.dll"), "ShutdownBlockReasonCreate");
    if (shutdownBRCreate == nullptr) {
        qWarning() << "registerShutdownBlockReason: GetProcAddress for ShutdownBlockReasonCreate failed";
        return;
    }
 
    if (shutdownBRCreate(mainWinId, strReason.toStdWString().c_str()))
        qInfo() << "registerShutdownBlockReason: Successfully registered: " + strReason;
    else
        qWarning() << "registerShutdownBlockReason: Failed to register: " + strReason;
}
#endif