956b3d92ef
This makes it easier to use in common cases: there is no need to come up with a unique name for the checker any more as sufficiently unique combination of wxApp::GetAppName() and wxGetUserId() is used if no name was explicitly given. This is done by calling the new CreateDefault() on demand from IsAnotherRunning() instead of simply creating the checker with the default name in the default ctor for compatibility (you had to call Create() after using the default ctor before and it can only be called once) and because wxTheApp might not exist yet when wxSingleInstanceChecker is created. Closes #11166. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61945 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: msw/snglinst.cpp
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// Purpose: implements wxSingleInstanceChecker class for Win32 using
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// named mutexes
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 08.06.01
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// RCS-ID: $Id$
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// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// License: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#if wxUSE_SNGLINST_CHECKER && defined(__WIN32__)
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#ifndef WX_PRECOMP
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#include "wx/string.h"
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#include "wx/log.h"
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#endif //WX_PRECOMP
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#include "wx/snglinst.h"
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#include "wx/msw/private.h"
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// ----------------------------------------------------------------------------
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// wxSingleInstanceCheckerImpl: the real implementation class
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxSingleInstanceCheckerImpl
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{
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public:
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wxSingleInstanceCheckerImpl()
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{
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// we don't care about m_wasOpened, it can't be accessed before being
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// initialized
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m_hMutex = NULL;
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}
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bool Create(const wxString& name)
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{
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m_hMutex = ::CreateMutex(NULL, FALSE, name.t_str());
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if ( !m_hMutex )
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{
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wxLogLastError(wxT("CreateMutex"));
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return false;
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}
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// mutex was either created or opened - see what really happened
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m_wasOpened = ::GetLastError() == ERROR_ALREADY_EXISTS;
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return true;
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}
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bool WasOpened() const
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{
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wxCHECK_MSG( m_hMutex, false,
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wxT("can't be called if mutex creation failed") );
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return m_wasOpened;
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}
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~wxSingleInstanceCheckerImpl()
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{
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if ( m_hMutex )
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{
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if ( !::CloseHandle(m_hMutex) )
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{
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wxLogLastError(wxT("CloseHandle(mutex)"));
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}
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}
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}
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private:
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// the result of the CreateMutex() call
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bool m_wasOpened;
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// the mutex handle, may be NULL
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HANDLE m_hMutex;
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wxDECLARE_NO_COPY_CLASS(wxSingleInstanceCheckerImpl);
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};
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// ============================================================================
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// wxSingleInstanceChecker implementation
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// ============================================================================
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bool wxSingleInstanceChecker::Create(const wxString& name,
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const wxString& WXUNUSED(path))
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{
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wxASSERT_MSG( !m_impl,
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wxT("calling wxSingleInstanceChecker::Create() twice?") );
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// creating unnamed mutex doesn't have the same semantics!
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wxASSERT_MSG( !name.empty(), wxT("mutex name can't be empty") );
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m_impl = new wxSingleInstanceCheckerImpl;
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return m_impl->Create(name);
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}
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bool wxSingleInstanceChecker::DoIsAnotherRunning() const
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{
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wxCHECK_MSG( m_impl, false, wxT("must call Create() first") );
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// if the mutex had been opened, another instance is running - otherwise we
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// would have created it
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return m_impl->WasOpened();
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}
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wxSingleInstanceChecker::~wxSingleInstanceChecker()
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{
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delete m_impl;
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}
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#endif // wxUSE_SNGLINST_CHECKER
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