CProcessCtrl

Derives from QProcess and adds a static method to start a detached
application without a console window.

refs #615

src/blackmisc/processctrl.cpp

@@ -0,0 +1,70 @@
+/* Copyright (C) 2016
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "blackmisc/processctrl.h"
+#include "blackmisc/buildconfig.h"
+#include "blackmisc/logmessage.h"
+
+#include <array>
+
+#ifdef Q_OS_WIN
+#include <Windows.h>
+#endif
+
+namespace BlackMisc
+{
+
+    CProcessCtrl::CProcessCtrl(QObject *parent) :
+        QProcess(parent)
+    { }
+
+    #ifdef Q_OS_WIN
+    bool CProcessCtrl::startDetachedWithoutConsole(const QString &program, const QStringList &arguments)
+    {
+        PROCESS_INFORMATION processInfo;
+        STARTUPINFOW startupInfo;
+        bool inherit = true;
+        DWORD flags = 0;
+
+        QString command;
+        command += program;
+        command += ' ';
+        command += arguments.join(' ').replace('/', '\\');
+
+        memset (&processInfo, 0, sizeof (processInfo));
+        memset (&startupInfo, 0, sizeof (startupInfo));
+        startupInfo.cb = sizeof (startupInfo);
+
+        flags |= NORMAL_PRIORITY_CLASS;
+        flags |= DETACHED_PROCESS;
+
+        Q_ASSERT(command.length() <= MAX_PATH);
+        std::array<WCHAR, MAX_PATH> wszCommandLine {};
+        command.toWCharArray(wszCommandLine.data());
+        int result = CreateProcess (nullptr, wszCommandLine.data(), 0, 0, inherit, flags, nullptr, nullptr, &startupInfo, &processInfo);
+
+        if (result == 0)
+        {
+            CLogMessage(static_cast<CProcessCtrl*>(nullptr)).warning("Failed to manually launch %1: %2") << program << GetLastError();
+            return false;
+        }
+
+        CloseHandle (processInfo.hProcess);
+        CloseHandle (processInfo.hThread);
+        return true;
+    }
+    #else
+    bool CProcessCtrl::startDetachedWithoutConsole(const QString &program, const QStringList &arguments)
+    {
+        return QProcess::startDetached(program, arguments);
+    }
+    #endif
+
+
+} // ns

src/blackmisc/processctrl.h

@@ -0,0 +1,37 @@
+/* Copyright (C) 2016
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_PROCESS_H
+#define BLACKMISC_PROCESS_H
+
+#include "blackmiscexport.h"
+#include <QProcess>
+
+namespace BlackMisc
+{
+    /*!
+     * Wrapper around QProcess with additional features
+     */
+    class BLACKMISC_EXPORT CProcessCtrl : public QProcess
+    {
+    public:
+        Q_OBJECT
+
+    public:
+        //! Constructor.
+        CProcessCtrl(QObject *parent = nullptr);
+
+        //! Start a programm detached and without any console window
+        static bool startDetachedWithoutConsole(const QString &program, const QStringList &arguments);
+    };
+} // ns
+
+#endif // guard