refs #756 Added class CProcessInfo to obtain a process name from its PID, and check if a process exists.

src/blackmisc/processinfo.cpp

@@ -0,0 +1,62 @@
+/* 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/processinfo.h"
+#include <QFile>
+#include <QFileInfo>
+#include <type_traits>
+
+#if defined(Q_OS_OSX)
+#include <libproc.h>
+#elif defined(Q_OS_WIN)
+#include <windows.h>
+#include <psapi.h>
+#endif
+
+namespace BlackMisc
+{
+
+    QString CProcessInfo::convertToQString(bool) const
+    {
+        return QString("{ %1, %2 }").arg(QString::number(m_pid), m_name);
+    }
+
+#if defined(Q_OS_LINUX)
+    QString CProcessInfo::processNameFromId(qint64 pid)
+    {
+        QString path = QFileInfo(QString("/proc/%1/exe").arg(pid)).symLinkTarget();
+        return QFileInfo(path).fileName();
+    }
+#elif defined(Q_OS_OSX)
+    QString CProcessInfo::processNameFromId(qint64 pid)
+    {
+        char name[1024];
+        proc_name(pid, name, std::extent<decltype(name)>::value);
+        return name;
+    }
+#elif defined(Q_OS_WIN)
+    QString CProcessInfo::processNameFromId(qint64 pid)
+    {
+        HANDLE proc = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, static_cast<DWORD>(pid));
+        if (! proc) { return ""; }
+        wchar_t path[1024];
+        auto len = GetModuleFileNameEx(proc, nullptr, path, std::extent<decltype(path)>::value);
+        CloseHandle(proc);
+        if (len <= 0) { return ""; }
+        return QFileInfo(QString::fromWCharArray(path)).completeBaseName();
+    }
+#else
+    QString CProcessInfo::processNameFromId(qint64)
+    {
+        qFatal("Not implemented");
+        return "";
+    }
+#endif
+
+}

src/blackmisc/processinfo.h

@@ -0,0 +1,67 @@
+/* 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_PROCESSINFO_H
+#define BLACKMISC_PROCESSINFO_H
+
+#include "blackmisc/valueobject.h"
+#include <QCoreApplication>
+#include <QString>
+
+namespace BlackMisc
+{
+    /*!
+     * Value class identifying a process, with a PID and a name.
+     */
+    class BLACKMISC_EXPORT CProcessInfo : public CValueObject<CProcessInfo>
+    {
+    public:
+        //! Construct an object identifying an invalid process.
+        CProcessInfo() {}
+
+        //! Construct an object identifying the process with the given PID.
+        explicit CProcessInfo(qint64 pid) : m_pid(pid), m_name(processNameFromId(pid)) {}
+
+        //! Construct an object identifying a process with the given PID and name.
+        CProcessInfo(qint64 pid, const QString &name) : m_pid(pid), m_name(name) {}
+
+        //! Return an object identifying the current process.
+        static CProcessInfo currentProcess() { return CProcessInfo(QCoreApplication::applicationPid()); }
+
+        //! True if this object identifies a process that exists.
+        bool exists() const { return ! m_name.isEmpty() && *this == CProcessInfo(m_pid); }
+
+        //! Get the pid.
+        qint64 processId() const { return m_pid; }
+
+        //! Get the process name.
+        const QString &processName() const { return m_name; }
+
+        //! \copydoc BlackMisc::Mixin::String::toQString
+        QString convertToQString(bool i18n = false) const;
+
+    private:
+        static QString processNameFromId(qint64 pid);
+
+        qint64 m_pid = 0;
+        QString m_name;
+
+        BLACK_METACLASS(
+            CProcessInfo,
+            BLACK_METAMEMBER(pid),
+            BLACK_METAMEMBER(name)
+        );
+    };
+}
+
+Q_DECLARE_METATYPE(BlackMisc::CProcessInfo)
+
+#endif

src/blackmisc/registermetadata.cpp

@@ -28,6 +28,7 @@
 #include "blackmisc/network/registermetadatanetwork.h"
 #include "blackmisc/pixmap.h"
 #include "blackmisc/pq/registermetadatapq.h"
+#include "blackmisc/processinfo.h"
 #include "blackmisc/propertyindex.h"
 #include "blackmisc/propertyindexlist.h"
 #include "blackmisc/propertyindexvariantmap.h"
@@ -71,6 +72,7 @@ namespace BlackMisc
         CNameVariantPair::registerMetadata();
         CNameVariantPairList::registerMetadata();
         CPixmap::registerMetadata();
+        CProcessInfo::registerMetadata();
         CPropertyIndex::registerMetadata();
         CPropertyIndex::registerMetadata();
         CPropertyIndexList::registerMetadata();