winshutdownmonitor.cpp

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// Copyright (c) 2014-2016 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 <shutdown.h>
 
#include <QDebug>
 
#include <windows.h>
 
// 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.
            StartShutdown();
            *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)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